src/game.c

   1 /***********************************************************
   2 * Rocks'n'Diamonds -- McDuffin Strikes Back!               *
   3 *----------------------------------------------------------*
   4 * (c) 1995-2002 Artsoft Entertainment                      *
   5 *               Holger Schemel                             *
   6 *               Detmolder Strasse 189                      *
   7 *               33604 Bielefeld                            *
   8 *               Germany                                    *
   9 *               e-mail: info@artsoft.org                   *
  10 *----------------------------------------------------------*
  11 * game.c                                                   *
  12 ***********************************************************/
  13
  14 #include "libgame/libgame.h"
  15
  16 #include "game.h"
  17 #include "init.h"
  18 #include "tools.h"
  19 #include "screens.h"
  20 #include "files.h"
  21 #include "tape.h"
  22 #include "network.h"
  23
  24 /* EXPERIMENTAL STUFF */
  25 #define USE_NEW_AMOEBA_CODE     FALSE
  26
  27 /* EXPERIMENTAL STUFF */
  28 #define USE_NEW_STUFF                   (                         1)
  29
  30 #define USE_NEW_SP_SLIPPERY             (USE_NEW_STUFF          * 1)
  31 #define USE_NEW_CUSTOM_VALUE            (USE_NEW_STUFF          * 1)
  32 #define USE_NEW_PLAYER_ANIM             (USE_NEW_STUFF          * 1)
  33 #define USE_NEW_ALL_SLIPPERY            (USE_NEW_STUFF          * 1)
  34 #define USE_NEW_PLAYER_SPEED            (USE_NEW_STUFF          * 1)
  35 #define USE_NEW_DELAYED_ACTION          (USE_NEW_STUFF          * 1)
  36 #define USE_NEW_SNAP_DELAY              (USE_NEW_STUFF          * 1)
  37 #define USE_ONLY_ONE_CHANGE_PER_FRAME   (USE_NEW_STUFF          * 1)
  38 #define USE_ONE_MORE_CHANGE_PER_FRAME   (USE_NEW_STUFF          * 1)
  39 #define USE_FIXED_DONT_RUN_INTO         (USE_NEW_STUFF          * 1)
  40 #define USE_NEW_SPRING_BUMPER           (USE_NEW_STUFF          * 1)
  41 #define USE_STOP_CHANGED_ELEMENTS       (USE_NEW_STUFF          * 1)
  42 #define USE_ELEMENT_TOUCHING_BUGFIX     (USE_NEW_STUFF          * 1)
  43 #define USE_NEW_CONTINUOUS_SNAPPING     (USE_NEW_STUFF          * 1)
  44
  45 #define USE_QUICKSAND_IMPACT_BUGFIX     (USE_NEW_STUFF          * 0)
  46
  47 /* for DigField() */
  48 #define DF_NO_PUSH              0
  49 #define DF_DIG                  1
  50 #define DF_SNAP                 2
  51
  52 /* for MovePlayer() */
  53 #define MP_NO_ACTION            0
  54 #define MP_MOVING               1
  55 #define MP_ACTION               2
  56 #define MP_DONT_RUN_INTO        (MP_MOVING | MP_ACTION)
  57
  58 /* for ScrollPlayer() */
  59 #define SCROLL_INIT             0
  60 #define SCROLL_GO_ON            1
  61
  62 /* for Bang()/Explode() */
  63 #define EX_PHASE_START          0
  64 #define EX_TYPE_NONE            0
  65 #define EX_TYPE_NORMAL          (1 << 0)
  66 #define EX_TYPE_CENTER          (1 << 1)
  67 #define EX_TYPE_BORDER          (1 << 2)
  68 #define EX_TYPE_CROSS           (1 << 3)
  69 #define EX_TYPE_DYNA            (1 << 4)
  70 #define EX_TYPE_SINGLE_TILE     (EX_TYPE_CENTER | EX_TYPE_BORDER)
  71
  72 /* special positions in the game control window (relative to control window) */
  73 #define XX_LEVEL                37
  74 #define YY_LEVEL                20
  75 #define XX_EMERALDS             29
  76 #define YY_EMERALDS             54
  77 #define XX_DYNAMITE             29
  78 #define YY_DYNAMITE             89
  79 #define XX_KEYS                 18
  80 #define YY_KEYS                 123
  81 #define XX_SCORE                15
  82 #define YY_SCORE                159
  83 #define XX_TIME1                29
  84 #define XX_TIME2                30
  85 #define YY_TIME                 194
  86
  87 /* special positions in the game control window (relative to main window) */
  88 #define DX_LEVEL                (DX + XX_LEVEL)
  89 #define DY_LEVEL                (DY + YY_LEVEL)
  90 #define DX_EMERALDS             (DX + XX_EMERALDS)
  91 #define DY_EMERALDS             (DY + YY_EMERALDS)
  92 #define DX_DYNAMITE             (DX + XX_DYNAMITE)
  93 #define DY_DYNAMITE             (DY + YY_DYNAMITE)
  94 #define DX_KEYS                 (DX + XX_KEYS)
  95 #define DY_KEYS                 (DY + YY_KEYS)
  96 #define DX_SCORE                (DX + XX_SCORE)
  97 #define DY_SCORE                (DY + YY_SCORE)
  98 #define DX_TIME1                (DX + XX_TIME1)
  99 #define DX_TIME2                (DX + XX_TIME2)
 100 #define DY_TIME                 (DY + YY_TIME)
 101
 102 /* values for delayed check of falling and moving elements and for collision */
 103 #define CHECK_DELAY_MOVING      3
 104 #define CHECK_DELAY_FALLING     3
 105 #define CHECK_DELAY_COLLISION   2
 106
 107 /* values for initial player move delay (initial delay counter value) */
 108 #define INITIAL_MOVE_DELAY_OFF  -1
 109 #define INITIAL_MOVE_DELAY_ON   0
 110
 111 /* values for player movement speed (which is in fact a delay value) */
 112 #define MOVE_DELAY_MIN_SPEED    32
 113 #define MOVE_DELAY_NORMAL_SPEED 8
 114 #define MOVE_DELAY_HIGH_SPEED   4
 115 #define MOVE_DELAY_MAX_SPEED    1
 116
 117 #if 0
 118 #define DOUBLE_MOVE_DELAY(x)    (x = (x <= MOVE_DELAY_HIGH_SPEED ? x * 2 : x))
 119 #define HALVE_MOVE_DELAY(x)     (x = (x >= MOVE_DELAY_HIGH_SPEED ? x / 2 : x))
 120 #else
 121 #define DOUBLE_MOVE_DELAY(x)    (x = (x < MOVE_DELAY_MIN_SPEED ? x * 2 : x))
 122 #define HALVE_MOVE_DELAY(x)     (x = (x > MOVE_DELAY_MAX_SPEED ? x / 2 : x))
 123 #endif
 124 #define DOUBLE_PLAYER_SPEED(p)  (HALVE_MOVE_DELAY((p)->move_delay_value))
 125 #define HALVE_PLAYER_SPEED(p)   (DOUBLE_MOVE_DELAY((p)->move_delay_value))
 126
 127 /* values for other actions */
 128 #define MOVE_STEPSIZE_NORMAL    (TILEX / MOVE_DELAY_NORMAL_SPEED)
 129 #define MOVE_STEPSIZE_MIN       (1)
 130 #define MOVE_STEPSIZE_MAX       (TILEX)
 131
 132 #define GET_DX_FROM_DIR(d)      ((d) == MV_LEFT ? -1 : (d) == MV_RIGHT ? 1 : 0)
 133 #define GET_DY_FROM_DIR(d)      ((d) == MV_UP   ? -1 : (d) == MV_DOWN  ? 1 : 0)
 134
 135 #define INIT_GFX_RANDOM()       (SimpleRND(1000000))
 136
 137 #define GET_NEW_PUSH_DELAY(e)   (   (element_info[e].push_delay_fixed) + \
 138                                  RND(element_info[e].push_delay_random))
 139 #define GET_NEW_DROP_DELAY(e)   (   (element_info[e].drop_delay_fixed) + \
 140                                  RND(element_info[e].drop_delay_random))
 141 #define GET_NEW_MOVE_DELAY(e)   (   (element_info[e].move_delay_fixed) + \
 142                                  RND(element_info[e].move_delay_random))
 143 #define GET_MAX_MOVE_DELAY(e)   (   (element_info[e].move_delay_fixed) + \
 144                                     (element_info[e].move_delay_random))
 145 #define GET_NEW_CUSTOM_VALUE(e) (   (element_info[e].ce_value_fixed_initial) +\
 146                                  RND(element_info[e].ce_value_random_initial))
 147 #define GET_CHANGE_DELAY(c)     (   ((c)->delay_fixed  * (c)->delay_frames) + \
 148                                  RND((c)->delay_random * (c)->delay_frames))
 149 #define GET_CE_DELAY_VALUE(c)   (   ((c)->delay_fixed) + \
 150                                  RND((c)->delay_random))
 151
 152 #if 1
 153 #define GET_VALID_RUNTIME_ELEMENT(e)                                    \
 154          ((e) >= NUM_RUNTIME_ELEMENTS ? EL_UNKNOWN : (e))
 155 #else
 156 #define GET_VALID_FILE_ELEMENT(e)                                       \
 157         ((e) >= NUM_FILE_ELEMENTS ? EL_UNKNOWN : (e))
 158 #endif
 159
 160 #define GET_TARGET_ELEMENT(e, ch)                                       \
 161         ((e) == EL_TRIGGER_PLAYER   ? (ch)->actual_trigger_player  :    \
 162          (e) == EL_TRIGGER_ELEMENT  ? (ch)->actual_trigger_element :    \
 163          (e) == EL_TRIGGER_CE_VALUE ? (ch)->actual_trigger_ce_value  : (e))
 164
 165 #define CAN_GROW_INTO(e)                                                \
 166         ((e) == EL_SAND || (IS_DIGGABLE(e) && level.grow_into_diggable))
 167
 168 #define ELEMENT_CAN_ENTER_FIELD_BASE_X(x, y, condition)                 \
 169                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 170                                         (condition)))
 171
 172 #define ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, condition)              \
 173                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 174                                         (CAN_MOVE_INTO_ACID(e) &&       \
 175                                          Feld[x][y] == EL_ACID) ||      \
 176                                         (condition)))
 177
 178 #define ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, condition)              \
 179                 (IN_LEV_FIELD(x, y) && (IS_FREE_OR_PLAYER(x, y) ||      \
 180                                         (CAN_MOVE_INTO_ACID(e) &&       \
 181                                          Feld[x][y] == EL_ACID) ||      \
 182                                         (condition)))
 183
 184 #define ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, condition)              \
 185                 (IN_LEV_FIELD(x, y) && (IS_FREE(x, y) ||                \
 186                                         (condition) ||                  \
 187                                         (CAN_MOVE_INTO_ACID(e) &&       \
 188                                          Feld[x][y] == EL_ACID) ||      \
 189                                         (DONT_COLLIDE_WITH(e) &&        \
 190                                          IS_PLAYER(x, y) &&             \
 191                                          !PLAYER_ENEMY_PROTECTED(x, y))))
 192
 193 #define ELEMENT_CAN_ENTER_FIELD(e, x, y)                                \
 194         ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, 0)
 195
 196 #define SATELLITE_CAN_ENTER_FIELD(x, y)                                 \
 197         ELEMENT_CAN_ENTER_FIELD_BASE_2(EL_SATELLITE, x, y, 0)
 198
 199 #define ANDROID_CAN_ENTER_FIELD(e, x, y)                                \
 200         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, Feld[x][y] == EL_EMC_PLANT)
 201
 202 #define ANDROID_CAN_CLONE_FIELD(x, y)                                   \
 203         (IN_LEV_FIELD(x, y) && (CAN_BE_CLONED_BY_ANDROID(Feld[x][y]) || \
 204                                 CAN_BE_CLONED_BY_ANDROID(EL_TRIGGER_ELEMENT)))
 205
 206 #define ENEMY_CAN_ENTER_FIELD(e, x, y)                                  \
 207         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 208
 209 #define YAMYAM_CAN_ENTER_FIELD(e, x, y)                                 \
 210         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, Feld[x][y] == EL_DIAMOND)
 211
 212 #define DARK_YAMYAM_CAN_ENTER_FIELD(e, x, y)                            \
 213         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x,y, IS_FOOD_DARK_YAMYAM(Feld[x][y]))
 214
 215 #define PACMAN_CAN_ENTER_FIELD(e, x, y)                                 \
 216         ELEMENT_CAN_ENTER_FIELD_BASE_3(e, x, y, IS_AMOEBOID(Feld[x][y]))
 217
 218 #define PIG_CAN_ENTER_FIELD(e, x, y)                                    \
 219         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, IS_FOOD_PIG(Feld[x][y]))
 220
 221 #define PENGUIN_CAN_ENTER_FIELD(e, x, y)                                \
 222         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, (Feld[x][y] == EL_EXIT_OPEN ||\
 223                                                  IS_FOOD_PENGUIN(Feld[x][y])))
 224 #define DRAGON_CAN_ENTER_FIELD(e, x, y)                                 \
 225         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 226
 227 #define MOLE_CAN_ENTER_FIELD(e, x, y, condition)                        \
 228         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, (condition))
 229
 230 #define SPRING_CAN_ENTER_FIELD(e, x, y)                                 \
 231         ELEMENT_CAN_ENTER_FIELD_BASE_2(e, x, y, 0)
 232
 233 #define SPRING_CAN_BUMP_FROM_FIELD(x, y)                                \
 234         (IN_LEV_FIELD(x, y) && (Feld[x][y] == EL_EMC_SPRING_BUMPER ||   \
 235                                 Feld[x][y] == EL_EMC_SPRING_BUMPER_ACTIVE))
 236
 237 #if 0
 238 #define GROUP_NR(e)             ((e) - EL_GROUP_START)
 239 #define IS_IN_GROUP(e, nr)      (element_info[e].in_group[nr] == TRUE)
 240 #define IS_IN_GROUP_EL(e, ge)   (IS_IN_GROUP(e, (ge) - EL_GROUP_START))
 241
 242 #define IS_EQUAL_OR_IN_GROUP(e, ge)                                     \
 243         (IS_GROUP_ELEMENT(ge) ? IS_IN_GROUP(e, GROUP_NR(ge)) : (e) == (ge))
 244 #endif
 245
 246 #define MOVE_ENTER_EL(e)        (element_info[e].move_enter_element)
 247
 248 #define CE_ENTER_FIELD_COND(e, x, y)                                    \
 249                 (!IS_PLAYER(x, y) &&                                    \
 250                  IS_EQUAL_OR_IN_GROUP(Feld[x][y], MOVE_ENTER_EL(e)))
 251
 252 #define CUSTOM_ELEMENT_CAN_ENTER_FIELD(e, x, y)                         \
 253         ELEMENT_CAN_ENTER_FIELD_BASE_4(e, x, y, CE_ENTER_FIELD_COND(e, x, y))
 254
 255 #define IN_LEV_FIELD_AND_IS_FREE(x, y)  (IN_LEV_FIELD(x, y) &&  IS_FREE(x, y))
 256 #define IN_LEV_FIELD_AND_NOT_FREE(x, y) (IN_LEV_FIELD(x, y) && !IS_FREE(x, y))
 257
 258 #define ACCESS_FROM(e, d)               (element_info[e].access_direction &(d))
 259 #define IS_WALKABLE_FROM(e, d)          (IS_WALKABLE(e)   && ACCESS_FROM(e, d))
 260 #define IS_PASSABLE_FROM(e, d)          (IS_PASSABLE(e)   && ACCESS_FROM(e, d))
 261 #define IS_ACCESSIBLE_FROM(e, d)        (IS_ACCESSIBLE(e) && ACCESS_FROM(e, d))
 262
 263 /* game button identifiers */
 264 #define GAME_CTRL_ID_STOP               0
 265 #define GAME_CTRL_ID_PAUSE              1
 266 #define GAME_CTRL_ID_PLAY               2
 267 #define SOUND_CTRL_ID_MUSIC             3
 268 #define SOUND_CTRL_ID_LOOPS             4
 269 #define SOUND_CTRL_ID_SIMPLE            5
 270
 271 #define NUM_GAME_BUTTONS                6
 272
 273
 274 /* forward declaration for internal use */
 275
 276 static void CreateField(int, int, int);
 277
 278 static void SetPlayerWaiting(struct PlayerInfo *, boolean);
 279 static void AdvanceFrameAndPlayerCounters(int);
 280
 281 static boolean MovePlayerOneStep(struct PlayerInfo *, int, int, int, int);
 282 static boolean MovePlayer(struct PlayerInfo *, int, int);
 283 static void ScrollPlayer(struct PlayerInfo *, int);
 284 static void ScrollScreen(struct PlayerInfo *, int);
 285
 286 int DigField(struct PlayerInfo *, int, int, int, int, int, int, int);
 287
 288 static void InitBeltMovement(void);
 289 static void CloseAllOpenTimegates(void);
 290 static void CheckGravityMovement(struct PlayerInfo *);
 291 static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *);
 292 static void KillPlayerUnlessEnemyProtected(int, int);
 293 static void KillPlayerUnlessExplosionProtected(int, int);
 294
 295 static void TestIfPlayerTouchesCustomElement(int, int);
 296 static void TestIfElementTouchesCustomElement(int, int);
 297 static void TestIfElementHitsCustomElement(int, int, int);
 298 #if 0
 299 static void TestIfElementSmashesCustomElement(int, int, int);
 300 #endif
 301
 302 static void HandleElementChange(int, int, int);
 303 static void ExecuteCustomElementAction(int, int, int, int);
 304 static boolean ChangeElement(int, int, int, int);
 305
 306 static boolean CheckTriggeredElementChangeExt(int, int, int, int, int,int,int);
 307 #define CheckTriggeredElementChange(x, y, e, ev)                        \
 308         CheckTriggeredElementChangeExt(x,y,e,ev, CH_PLAYER_ANY,CH_SIDE_ANY, -1)
 309 #define CheckTriggeredElementChangeByPlayer(x, y, e, ev, p, s)          \
 310         CheckTriggeredElementChangeExt(x, y, e, ev, p, s, -1)
 311 #define CheckTriggeredElementChangeBySide(x, y, e, ev, s)               \
 312         CheckTriggeredElementChangeExt(x, y, e, ev, CH_PLAYER_ANY, s, -1)
 313 #define CheckTriggeredElementChangeByPage(x, y, e, ev, p)               \
 314         CheckTriggeredElementChangeExt(x,y,e,ev, CH_PLAYER_ANY, CH_SIDE_ANY, p)
 315
 316 static boolean CheckElementChangeExt(int, int, int, int, int, int, int);
 317 #define CheckElementChange(x, y, e, te, ev)                             \
 318         CheckElementChangeExt(x, y, e, te, ev, CH_PLAYER_ANY, CH_SIDE_ANY)
 319 #define CheckElementChangeByPlayer(x, y, e, ev, p, s)                   \
 320         CheckElementChangeExt(x, y, e, EL_EMPTY, ev, p, s)
 321 #define CheckElementChangeBySide(x, y, e, te, ev, s)                    \
 322         CheckElementChangeExt(x, y, e, te, ev, CH_PLAYER_ANY, s)
 323
 324 static void PlayLevelSound(int, int, int);
 325 static void PlayLevelSoundNearest(int, int, int);
 326 static void PlayLevelSoundAction(int, int, int);
 327 static void PlayLevelSoundElementAction(int, int, int, int);
 328 static void PlayLevelSoundElementActionIfLoop(int, int, int, int);
 329 static void PlayLevelSoundActionIfLoop(int, int, int);
 330 static void StopLevelSoundActionIfLoop(int, int, int);
 331 static void PlayLevelMusic();
 332
 333 static void MapGameButtons();
 334 static void HandleGameButtons(struct GadgetInfo *);
 335
 336 int AmoebeNachbarNr(int, int);
 337 void AmoebeUmwandeln(int, int);
 338 void ContinueMoving(int, int);
 339 void Bang(int, int);
 340 void InitMovDir(int, int);
 341 void InitAmoebaNr(int, int);
 342 int NewHiScore(void);
 343
 344 void TestIfGoodThingHitsBadThing(int, int, int);
 345 void TestIfBadThingHitsGoodThing(int, int, int);
 346 void TestIfPlayerTouchesBadThing(int, int);
 347 void TestIfPlayerRunsIntoBadThing(int, int, int);
 348 void TestIfBadThingTouchesPlayer(int, int);
 349 void TestIfBadThingRunsIntoPlayer(int, int, int);
 350 void TestIfFriendTouchesBadThing(int, int);
 351 void TestIfBadThingTouchesFriend(int, int);
 352 void TestIfBadThingTouchesOtherBadThing(int, int);
 353
 354 void KillPlayer(struct PlayerInfo *);
 355 void BuryPlayer(struct PlayerInfo *);
 356 void RemovePlayer(struct PlayerInfo *);
 357
 358 boolean SnapField(struct PlayerInfo *, int, int);
 359 boolean DropElement(struct PlayerInfo *);
 360
 361
 362 static struct GadgetInfo *game_gadget[NUM_GAME_BUTTONS];
 363
 364
 365 /* ------------------------------------------------------------------------- */
 366 /* definition of elements that automatically change to other elements after  */
 367 /* a specified time, eventually calling a function when changing             */
 368 /* ------------------------------------------------------------------------- */
 369
 370 /* forward declaration for changer functions */
 371 static void InitBuggyBase(int, int);
 372 static void WarnBuggyBase(int, int);
 373
 374 static void InitTrap(int, int);
 375 static void ActivateTrap(int, int);
 376 static void ChangeActiveTrap(int, int);
 377
 378 static void InitRobotWheel(int, int);
 379 static void RunRobotWheel(int, int);
 380 static void StopRobotWheel(int, int);
 381
 382 static void InitTimegateWheel(int, int);
 383 static void RunTimegateWheel(int, int);
 384
 385 static void InitMagicBallDelay(int, int);
 386 static void ActivateMagicBall(int, int);
 387
 388 static void InitDiagonalMovingElement(int, int);
 389
 390 struct ChangingElementInfo
 391 {
 392   int element;
 393   int target_element;
 394   int change_delay;
 395   void (*pre_change_function)(int x, int y);
 396   void (*change_function)(int x, int y);
 397   void (*post_change_function)(int x, int y);
 398 };
 399
 400 static struct ChangingElementInfo change_delay_list[] =
 401 {
 402   {
 403     EL_NUT_BREAKING,
 404     EL_EMERALD,
 405     6,
 406     NULL,
 407     NULL,
 408     NULL
 409   },
 410   {
 411     EL_PEARL_BREAKING,
 412     EL_EMPTY,
 413     8,
 414     NULL,
 415     NULL,
 416     NULL
 417   },
 418   {
 419     EL_EXIT_OPENING,
 420     EL_EXIT_OPEN,
 421     29,
 422     NULL,
 423     NULL,
 424     NULL
 425   },
 426   {
 427     EL_EXIT_CLOSING,
 428     EL_EXIT_CLOSED,
 429     29,
 430     NULL,
 431     NULL,
 432     NULL
 433   },
 434   {
 435     EL_SP_EXIT_OPENING,
 436     EL_SP_EXIT_OPEN,
 437     29,
 438     NULL,
 439     NULL,
 440     NULL
 441   },
 442   {
 443     EL_SP_EXIT_CLOSING,
 444     EL_SP_EXIT_CLOSED,
 445     29,
 446     NULL,
 447     NULL,
 448     NULL
 449   },
 450   {
 451     EL_SWITCHGATE_OPENING,
 452     EL_SWITCHGATE_OPEN,
 453     29,
 454     NULL,
 455     NULL,
 456     NULL
 457   },
 458   {
 459     EL_SWITCHGATE_CLOSING,
 460     EL_SWITCHGATE_CLOSED,
 461     29,
 462     NULL,
 463     NULL,
 464     NULL
 465   },
 466   {
 467     EL_TIMEGATE_OPENING,
 468     EL_TIMEGATE_OPEN,
 469     29,
 470     NULL,
 471     NULL,
 472     NULL
 473   },
 474   {
 475     EL_TIMEGATE_CLOSING,
 476     EL_TIMEGATE_CLOSED,
 477     29,
 478     NULL,
 479     NULL,
 480     NULL
 481   },
 482
 483   {
 484     EL_ACID_SPLASH_LEFT,
 485     EL_EMPTY,
 486     8,
 487     NULL,
 488     NULL,
 489     NULL
 490   },
 491   {
 492     EL_ACID_SPLASH_RIGHT,
 493     EL_EMPTY,
 494     8,
 495     NULL,
 496     NULL,
 497     NULL
 498   },
 499   {
 500     EL_SP_BUGGY_BASE,
 501     EL_SP_BUGGY_BASE_ACTIVATING,
 502     0,
 503     InitBuggyBase,
 504     NULL,
 505     NULL
 506   },
 507   {
 508     EL_SP_BUGGY_BASE_ACTIVATING,
 509     EL_SP_BUGGY_BASE_ACTIVE,
 510     0,
 511     InitBuggyBase,
 512     NULL,
 513     NULL
 514   },
 515   {
 516     EL_SP_BUGGY_BASE_ACTIVE,
 517     EL_SP_BUGGY_BASE,
 518     0,
 519     InitBuggyBase,
 520     WarnBuggyBase,
 521     NULL
 522   },
 523   {
 524     EL_TRAP,
 525     EL_TRAP_ACTIVE,
 526     0,
 527     InitTrap,
 528     NULL,
 529     ActivateTrap
 530   },
 531   {
 532     EL_TRAP_ACTIVE,
 533     EL_TRAP,
 534     31,
 535     NULL,
 536     ChangeActiveTrap,
 537     NULL
 538   },
 539   {
 540     EL_ROBOT_WHEEL_ACTIVE,
 541     EL_ROBOT_WHEEL,
 542     0,
 543     InitRobotWheel,
 544     RunRobotWheel,
 545     StopRobotWheel
 546   },
 547   {
 548     EL_TIMEGATE_SWITCH_ACTIVE,
 549     EL_TIMEGATE_SWITCH,
 550     0,
 551     InitTimegateWheel,
 552     RunTimegateWheel,
 553     NULL
 554   },
 555   {
 556     EL_EMC_MAGIC_BALL_ACTIVE,
 557     EL_EMC_MAGIC_BALL_ACTIVE,
 558     0,
 559     InitMagicBallDelay,
 560     NULL,
 561     ActivateMagicBall
 562   },
 563   {
 564     EL_EMC_SPRING_BUMPER_ACTIVE,
 565     EL_EMC_SPRING_BUMPER,
 566     8,
 567     NULL,
 568     NULL,
 569     NULL
 570   },
 571   {
 572     EL_DIAGONAL_SHRINKING,
 573     EL_UNDEFINED,
 574     0,
 575     NULL,
 576     NULL,
 577     NULL
 578   },
 579   {
 580     EL_DIAGONAL_GROWING,
 581     EL_UNDEFINED,
 582     0,
 583     NULL,
 584     NULL,
 585     InitDiagonalMovingElement
 586   },
 587
 588   {
 589     EL_UNDEFINED,
 590     EL_UNDEFINED,
 591     -1,
 592     NULL,
 593     NULL,
 594     NULL
 595   }
 596 };
 597
 598 struct
 599 {
 600   int element;
 601   int push_delay_fixed, push_delay_random;
 602 }
 603 push_delay_list[] =
 604 {
 605   { EL_SPRING,                  0, 0 },
 606   { EL_BALLOON,                 0, 0 },
 607
 608   { EL_SOKOBAN_OBJECT,          2, 0 },
 609   { EL_SOKOBAN_FIELD_FULL,      2, 0 },
 610   { EL_SATELLITE,               2, 0 },
 611   { EL_SP_DISK_YELLOW,          2, 0 },
 612
 613   { EL_UNDEFINED,               0, 0 },
 614 };
 615
 616 struct
 617 {
 618   int element;
 619   int move_stepsize;
 620 }
 621 move_stepsize_list[] =
 622 {
 623   { EL_AMOEBA_DROP,             2 },
 624   { EL_AMOEBA_DROPPING,         2 },
 625   { EL_QUICKSAND_FILLING,       1 },
 626   { EL_QUICKSAND_EMPTYING,      1 },
 627   { EL_MAGIC_WALL_FILLING,      2 },
 628   { EL_BD_MAGIC_WALL_FILLING,   2 },
 629   { EL_MAGIC_WALL_EMPTYING,     2 },
 630   { EL_BD_MAGIC_WALL_EMPTYING,  2 },
 631
 632   { EL_UNDEFINED,               0 },
 633 };
 634
 635 struct
 636 {
 637   int element;
 638   int count;
 639 }
 640 collect_count_list[] =
 641 {
 642   { EL_EMERALD,                 1 },
 643   { EL_BD_DIAMOND,              1 },
 644   { EL_EMERALD_YELLOW,          1 },
 645   { EL_EMERALD_RED,             1 },
 646   { EL_EMERALD_PURPLE,          1 },
 647   { EL_DIAMOND,                 3 },
 648   { EL_SP_INFOTRON,             1 },
 649   { EL_PEARL,                   5 },
 650   { EL_CRYSTAL,                 8 },
 651
 652   { EL_UNDEFINED,               0 },
 653 };
 654
 655 struct
 656 {
 657   int element;
 658   int direction;
 659 }
 660 access_direction_list[] =
 661 {
 662   { EL_TUBE_ANY,                        MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN },
 663   { EL_TUBE_VERTICAL,                                        MV_UP | MV_DOWN },
 664   { EL_TUBE_HORIZONTAL,                 MV_LEFT | MV_RIGHT                   },
 665   { EL_TUBE_VERTICAL_LEFT,              MV_LEFT |            MV_UP | MV_DOWN },
 666   { EL_TUBE_VERTICAL_RIGHT,                       MV_RIGHT | MV_UP | MV_DOWN },
 667   { EL_TUBE_HORIZONTAL_UP,              MV_LEFT | MV_RIGHT | MV_UP           },
 668   { EL_TUBE_HORIZONTAL_DOWN,            MV_LEFT | MV_RIGHT |         MV_DOWN },
 669   { EL_TUBE_LEFT_UP,                    MV_LEFT |            MV_UP           },
 670   { EL_TUBE_LEFT_DOWN,                  MV_LEFT |                    MV_DOWN },
 671   { EL_TUBE_RIGHT_UP,                             MV_RIGHT | MV_UP           },
 672   { EL_TUBE_RIGHT_DOWN,                           MV_RIGHT |         MV_DOWN },
 673
 674   { EL_SP_PORT_LEFT,                              MV_RIGHT                   },
 675   { EL_SP_PORT_RIGHT,                   MV_LEFT                              },
 676   { EL_SP_PORT_UP,                                                   MV_DOWN },
 677   { EL_SP_PORT_DOWN,                                         MV_UP           },
 678   { EL_SP_PORT_HORIZONTAL,              MV_LEFT | MV_RIGHT                   },
 679   { EL_SP_PORT_VERTICAL,                                     MV_UP | MV_DOWN },
 680   { EL_SP_PORT_ANY,                     MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN },
 681   { EL_SP_GRAVITY_PORT_LEFT,                      MV_RIGHT                   },
 682   { EL_SP_GRAVITY_PORT_RIGHT,           MV_LEFT                              },
 683   { EL_SP_GRAVITY_PORT_UP,                                           MV_DOWN },
 684   { EL_SP_GRAVITY_PORT_DOWN,                                 MV_UP           },
 685   { EL_SP_GRAVITY_ON_PORT_LEFT,                   MV_RIGHT                   },
 686   { EL_SP_GRAVITY_ON_PORT_RIGHT,        MV_LEFT                              },
 687   { EL_SP_GRAVITY_ON_PORT_UP,                                        MV_DOWN },
 688   { EL_SP_GRAVITY_ON_PORT_DOWN,                              MV_UP           },
 689   { EL_SP_GRAVITY_OFF_PORT_LEFT,                  MV_RIGHT                   },
 690   { EL_SP_GRAVITY_OFF_PORT_RIGHT,       MV_LEFT                              },
 691   { EL_SP_GRAVITY_OFF_PORT_UP,                                       MV_DOWN },
 692   { EL_SP_GRAVITY_OFF_PORT_DOWN,                             MV_UP           },
 693
 694   { EL_UNDEFINED,                       MV_NONE                              }
 695 };
 696
 697 static boolean trigger_events[MAX_NUM_ELEMENTS][NUM_CHANGE_EVENTS];
 698
 699 #define IS_AUTO_CHANGING(e)     (element_info[e].has_change_event[CE_DELAY])
 700 #define IS_JUST_CHANGING(x, y)  (ChangeDelay[x][y] != 0)
 701 #define IS_CHANGING(x, y)       (IS_AUTO_CHANGING(Feld[x][y]) || \
 702                                  IS_JUST_CHANGING(x, y))
 703
 704 #define CE_PAGE(e, ce)          (element_info[e].event_page[ce])
 705
 706 /* static variables for playfield scan mode (scanning forward or backward) */
 707 static int playfield_scan_start_x = 0;
 708 static int playfield_scan_start_y = 0;
 709 static int playfield_scan_delta_x = 1;
 710 static int playfield_scan_delta_y = 1;
 711
 712 #define SCAN_PLAYFIELD(x, y)    for ((y) = playfield_scan_start_y;      \
 713                                      (y) >= 0 && (y) <= lev_fieldy - 1; \
 714                                      (y) += playfield_scan_delta_y)     \
 715                                 for ((x) = playfield_scan_start_x;      \
 716                                      (x) >= 0 && (x) <= lev_fieldx - 1; \
 717                                      (x) += playfield_scan_delta_x)     \
 718
 719 #ifdef DEBUG
 720 void DEBUG_SetMaximumDynamite()
 721 {
 722   int i;
 723
 724   for (i = 0; i < MAX_INVENTORY_SIZE; i++)
 725     if (local_player->inventory_size < MAX_INVENTORY_SIZE)
 726       local_player->inventory_element[local_player->inventory_size++] =
 727         EL_DYNAMITE;
 728 }
 729 #endif
 730
 731 static void InitPlayfieldScanModeVars()
 732 {
 733   if (game.use_reverse_scan_direction)
 734   {
 735     playfield_scan_start_x = lev_fieldx - 1;
 736     playfield_scan_start_y = lev_fieldy - 1;
 737
 738     playfield_scan_delta_x = -1;
 739     playfield_scan_delta_y = -1;
 740   }
 741   else
 742   {
 743     playfield_scan_start_x = 0;
 744     playfield_scan_start_y = 0;
 745
 746     playfield_scan_delta_x = 1;
 747     playfield_scan_delta_y = 1;
 748   }
 749 }
 750
 751 static void InitPlayfieldScanMode(int mode)
 752 {
 753   game.use_reverse_scan_direction =
 754     (mode == CA_ARG_SCAN_MODE_REVERSE ? TRUE : FALSE);
 755
 756   InitPlayfieldScanModeVars();
 757 }
 758
 759 static int get_move_delay_from_stepsize(int move_stepsize)
 760 {
 761   move_stepsize =
 762     MIN(MAX(MOVE_STEPSIZE_MIN, move_stepsize), MOVE_STEPSIZE_MAX);
 763
 764   /* make sure that stepsize value is always a power of 2 */
 765   move_stepsize = (1 << log_2(move_stepsize));
 766
 767   return TILEX / move_stepsize;
 768 }
 769
 770 static void SetPlayerMoveSpeed(struct PlayerInfo *player, int move_stepsize,
 771                                boolean init_game)
 772 {
 773   int move_delay = get_move_delay_from_stepsize(move_stepsize);
 774   boolean cannot_move = (move_stepsize == STEPSIZE_NOT_MOVING ? TRUE : FALSE);
 775
 776   /* do no immediately change move delay -- the player might just be moving */
 777   player->move_delay_value_next = move_delay;
 778
 779   /* information if player can move must be set separately */
 780   player->cannot_move = cannot_move;
 781
 782   if (init_game)
 783   {
 784     player->move_delay       = game.initial_move_delay;
 785     player->move_delay_value = game.initial_move_delay_value;
 786
 787     player->move_delay_value_next = -1;
 788
 789     player->move_delay_reset_counter = 0;
 790   }
 791 }
 792
 793 void GetPlayerConfig()
 794 {
 795   if (!audio.sound_available)
 796     setup.sound_simple = FALSE;
 797
 798   if (!audio.loops_available)
 799     setup.sound_loops = FALSE;
 800
 801   if (!audio.music_available)
 802     setup.sound_music = FALSE;
 803
 804   if (!video.fullscreen_available)
 805     setup.fullscreen = FALSE;
 806
 807   setup.sound = (setup.sound_simple || setup.sound_loops || setup.sound_music);
 808
 809   SetAudioMode(setup.sound);
 810   InitJoysticks();
 811 }
 812
 813 static int getBeltNrFromBeltElement(int element)
 814 {
 815   return (element < EL_CONVEYOR_BELT_2_LEFT ? 0 :
 816           element < EL_CONVEYOR_BELT_3_LEFT ? 1 :
 817           element < EL_CONVEYOR_BELT_4_LEFT ? 2 : 3);
 818 }
 819
 820 static int getBeltNrFromBeltActiveElement(int element)
 821 {
 822   return (element < EL_CONVEYOR_BELT_2_LEFT_ACTIVE ? 0 :
 823           element < EL_CONVEYOR_BELT_3_LEFT_ACTIVE ? 1 :
 824           element < EL_CONVEYOR_BELT_4_LEFT_ACTIVE ? 2 : 3);
 825 }
 826
 827 static int getBeltNrFromBeltSwitchElement(int element)
 828 {
 829   return (element < EL_CONVEYOR_BELT_2_SWITCH_LEFT ? 0 :
 830           element < EL_CONVEYOR_BELT_3_SWITCH_LEFT ? 1 :
 831           element < EL_CONVEYOR_BELT_4_SWITCH_LEFT ? 2 : 3);
 832 }
 833
 834 static int getBeltDirNrFromBeltSwitchElement(int element)
 835 {
 836   static int belt_base_element[4] =
 837   {
 838     EL_CONVEYOR_BELT_1_SWITCH_LEFT,
 839     EL_CONVEYOR_BELT_2_SWITCH_LEFT,
 840     EL_CONVEYOR_BELT_3_SWITCH_LEFT,
 841     EL_CONVEYOR_BELT_4_SWITCH_LEFT
 842   };
 843
 844   int belt_nr = getBeltNrFromBeltSwitchElement(element);
 845   int belt_dir_nr = element - belt_base_element[belt_nr];
 846
 847   return (belt_dir_nr % 3);
 848 }
 849
 850 static int getBeltDirFromBeltSwitchElement(int element)
 851 {
 852   static int belt_move_dir[3] =
 853   {
 854     MV_LEFT,
 855     MV_NONE,
 856     MV_RIGHT
 857   };
 858
 859   int belt_dir_nr = getBeltDirNrFromBeltSwitchElement(element);
 860
 861   return belt_move_dir[belt_dir_nr];
 862 }
 863
 864 static void InitPlayerField(int x, int y, int element, boolean init_game)
 865 {
 866   if (element == EL_SP_MURPHY)
 867   {
 868     if (init_game)
 869     {
 870       if (stored_player[0].present)
 871       {
 872         Feld[x][y] = EL_SP_MURPHY_CLONE;
 873
 874         return;
 875       }
 876       else
 877       {
 878         stored_player[0].use_murphy = TRUE;
 879
 880         if (!level.use_artwork_element[0])
 881           stored_player[0].artwork_element = EL_SP_MURPHY;
 882       }
 883
 884       Feld[x][y] = EL_PLAYER_1;
 885     }
 886   }
 887
 888   if (init_game)
 889   {
 890     struct PlayerInfo *player = &stored_player[Feld[x][y] - EL_PLAYER_1];
 891     int jx = player->jx, jy = player->jy;
 892
 893     player->present = TRUE;
 894
 895     player->block_last_field = (element == EL_SP_MURPHY ?
 896                                 level.sp_block_last_field :
 897                                 level.block_last_field);
 898
 899     /* ---------- initialize player's last field block delay --------------- */
 900
 901     /* always start with reliable default value (no adjustment needed) */
 902     player->block_delay_adjustment = 0;
 903
 904     /* special case 1: in Supaplex, Murphy blocks last field one more frame */
 905     if (player->block_last_field && element == EL_SP_MURPHY)
 906       player->block_delay_adjustment = 1;
 907
 908     /* special case 2: in game engines before 3.1.1, blocking was different */
 909     if (game.use_block_last_field_bug)
 910       player->block_delay_adjustment = (player->block_last_field ? -1 : 1);
 911
 912     if (!options.network || player->connected)
 913     {
 914       player->active = TRUE;
 915
 916       /* remove potentially duplicate players */
 917       if (StorePlayer[jx][jy] == Feld[x][y])
 918         StorePlayer[jx][jy] = 0;
 919
 920       StorePlayer[x][y] = Feld[x][y];
 921
 922       if (options.debug)
 923       {
 924         printf("Player %d activated.\n", player->element_nr);
 925         printf("[Local player is %d and currently %s.]\n",
 926                local_player->element_nr,
 927                local_player->active ? "active" : "not active");
 928       }
 929     }
 930
 931     Feld[x][y] = EL_EMPTY;
 932
 933     player->jx = player->last_jx = x;
 934     player->jy = player->last_jy = y;
 935   }
 936 }
 937
 938 static void InitField(int x, int y, boolean init_game)
 939 {
 940   int element = Feld[x][y];
 941
 942   switch (element)
 943   {
 944     case EL_SP_MURPHY:
 945     case EL_PLAYER_1:
 946     case EL_PLAYER_2:
 947     case EL_PLAYER_3:
 948     case EL_PLAYER_4:
 949       InitPlayerField(x, y, element, init_game);
 950       break;
 951
 952     case EL_SOKOBAN_FIELD_PLAYER:
 953       element = Feld[x][y] = EL_PLAYER_1;
 954       InitField(x, y, init_game);
 955
 956       element = Feld[x][y] = EL_SOKOBAN_FIELD_EMPTY;
 957       InitField(x, y, init_game);
 958       break;
 959
 960     case EL_SOKOBAN_FIELD_EMPTY:
 961       local_player->sokobanfields_still_needed++;
 962       break;
 963
 964     case EL_STONEBLOCK:
 965       if (x < lev_fieldx-1 && Feld[x+1][y] == EL_ACID)
 966         Feld[x][y] = EL_ACID_POOL_TOPLEFT;
 967       else if (x > 0 && Feld[x-1][y] == EL_ACID)
 968         Feld[x][y] = EL_ACID_POOL_TOPRIGHT;
 969       else if (y > 0 && Feld[x][y-1] == EL_ACID_POOL_TOPLEFT)
 970         Feld[x][y] = EL_ACID_POOL_BOTTOMLEFT;
 971       else if (y > 0 && Feld[x][y-1] == EL_ACID)
 972         Feld[x][y] = EL_ACID_POOL_BOTTOM;
 973       else if (y > 0 && Feld[x][y-1] == EL_ACID_POOL_TOPRIGHT)
 974         Feld[x][y] = EL_ACID_POOL_BOTTOMRIGHT;
 975       break;
 976
 977     case EL_BUG:
 978     case EL_BUG_RIGHT:
 979     case EL_BUG_UP:
 980     case EL_BUG_LEFT:
 981     case EL_BUG_DOWN:
 982     case EL_SPACESHIP:
 983     case EL_SPACESHIP_RIGHT:
 984     case EL_SPACESHIP_UP:
 985     case EL_SPACESHIP_LEFT:
 986     case EL_SPACESHIP_DOWN:
 987     case EL_BD_BUTTERFLY:
 988     case EL_BD_BUTTERFLY_RIGHT:
 989     case EL_BD_BUTTERFLY_UP:
 990     case EL_BD_BUTTERFLY_LEFT:
 991     case EL_BD_BUTTERFLY_DOWN:
 992     case EL_BD_FIREFLY:
 993     case EL_BD_FIREFLY_RIGHT:
 994     case EL_BD_FIREFLY_UP:
 995     case EL_BD_FIREFLY_LEFT:
 996     case EL_BD_FIREFLY_DOWN:
 997     case EL_PACMAN_RIGHT:
 998     case EL_PACMAN_UP:
 999     case EL_PACMAN_LEFT:
1000     case EL_PACMAN_DOWN:
1001     case EL_YAMYAM:
1002     case EL_YAMYAM_LEFT:
1003     case EL_YAMYAM_RIGHT:
1004     case EL_YAMYAM_UP:
1005     case EL_YAMYAM_DOWN:
1006     case EL_DARK_YAMYAM:
1007     case EL_ROBOT:
1008     case EL_PACMAN:
1009     case EL_SP_SNIKSNAK:
1010     case EL_SP_ELECTRON:
1011     case EL_MOLE:
1012     case EL_MOLE_LEFT:
1013     case EL_MOLE_RIGHT:
1014     case EL_MOLE_UP:
1015     case EL_MOLE_DOWN:
1016       InitMovDir(x, y);
1017       break;
1018
1019     case EL_AMOEBA_FULL:
1020     case EL_BD_AMOEBA:
1021       InitAmoebaNr(x, y);
1022       break;
1023
1024     case EL_AMOEBA_DROP:
1025       if (y == lev_fieldy - 1)
1026       {
1027         Feld[x][y] = EL_AMOEBA_GROWING;
1028         Store[x][y] = EL_AMOEBA_WET;
1029       }
1030       break;
1031
1032     case EL_DYNAMITE_ACTIVE:
1033     case EL_SP_DISK_RED_ACTIVE:
1034     case EL_DYNABOMB_PLAYER_1_ACTIVE:
1035     case EL_DYNABOMB_PLAYER_2_ACTIVE:
1036     case EL_DYNABOMB_PLAYER_3_ACTIVE:
1037     case EL_DYNABOMB_PLAYER_4_ACTIVE:
1038       MovDelay[x][y] = 96;
1039       break;
1040
1041     case EL_EM_DYNAMITE_ACTIVE:
1042       MovDelay[x][y] = 32;
1043       break;
1044
1045     case EL_LAMP:
1046       local_player->lights_still_needed++;
1047       break;
1048
1049     case EL_PENGUIN:
1050       local_player->friends_still_needed++;
1051       break;
1052
1053     case EL_PIG:
1054     case EL_DRAGON:
1055       GfxDir[x][y] = MovDir[x][y] = 1 << RND(4);
1056       break;
1057
1058     case EL_CONVEYOR_BELT_1_SWITCH_LEFT:
1059     case EL_CONVEYOR_BELT_1_SWITCH_MIDDLE:
1060     case EL_CONVEYOR_BELT_1_SWITCH_RIGHT:
1061     case EL_CONVEYOR_BELT_2_SWITCH_LEFT:
1062     case EL_CONVEYOR_BELT_2_SWITCH_MIDDLE:
1063     case EL_CONVEYOR_BELT_2_SWITCH_RIGHT:
1064     case EL_CONVEYOR_BELT_3_SWITCH_LEFT:
1065     case EL_CONVEYOR_BELT_3_SWITCH_MIDDLE:
1066     case EL_CONVEYOR_BELT_3_SWITCH_RIGHT:
1067     case EL_CONVEYOR_BELT_4_SWITCH_LEFT:
1068     case EL_CONVEYOR_BELT_4_SWITCH_MIDDLE:
1069     case EL_CONVEYOR_BELT_4_SWITCH_RIGHT:
1070       if (init_game)
1071       {
1072         int belt_nr = getBeltNrFromBeltSwitchElement(Feld[x][y]);
1073         int belt_dir = getBeltDirFromBeltSwitchElement(Feld[x][y]);
1074         int belt_dir_nr = getBeltDirNrFromBeltSwitchElement(Feld[x][y]);
1075
1076         if (game.belt_dir_nr[belt_nr] == 3)     /* initial value */
1077         {
1078           game.belt_dir[belt_nr] = belt_dir;
1079           game.belt_dir_nr[belt_nr] = belt_dir_nr;
1080         }
1081         else    /* more than one switch -- set it like the first switch */
1082         {
1083           Feld[x][y] = Feld[x][y] - belt_dir_nr + game.belt_dir_nr[belt_nr];
1084         }
1085       }
1086       break;
1087
1088     case EL_SWITCHGATE_SWITCH_DOWN:     /* always start with same switch pos */
1089       if (init_game)
1090         Feld[x][y] = EL_SWITCHGATE_SWITCH_UP;
1091       break;
1092
1093     case EL_LIGHT_SWITCH_ACTIVE:
1094       if (init_game)
1095         game.light_time_left = level.time_light * FRAMES_PER_SECOND;
1096       break;
1097
1098     case EL_EMC_MAGIC_BALL:
1099       if (game.ball_state)
1100         Feld[x][y] = EL_EMC_MAGIC_BALL_ACTIVE;
1101       break;
1102
1103     case EL_EMC_MAGIC_BALL_SWITCH:
1104       if (game.ball_state)
1105         Feld[x][y] = EL_EMC_MAGIC_BALL_SWITCH_ACTIVE;
1106       break;
1107
1108     default:
1109 #if 1
1110       if (IS_CUSTOM_ELEMENT(element))
1111       {
1112         if (CAN_MOVE(element))
1113           InitMovDir(x, y);
1114
1115 #if USE_NEW_CUSTOM_VALUE
1116         if (!element_info[element].use_last_ce_value || init_game)
1117           CustomValue[x][y] = GET_NEW_CUSTOM_VALUE(Feld[x][y]);
1118 #endif
1119       }
1120 #else
1121       if (IS_CUSTOM_ELEMENT(element) && CAN_MOVE(element))
1122         InitMovDir(x, y);
1123 #endif
1124       else if (IS_GROUP_ELEMENT(element))
1125       {
1126         struct ElementGroupInfo *group = element_info[element].group;
1127         int last_anim_random_frame = gfx.anim_random_frame;
1128         int element_pos;
1129
1130         if (group->choice_mode == ANIM_RANDOM)
1131           gfx.anim_random_frame = RND(group->num_elements_resolved);
1132
1133         element_pos = getAnimationFrame(group->num_elements_resolved, 1,
1134                                         group->choice_mode, 0,
1135                                         group->choice_pos);
1136
1137         if (group->choice_mode == ANIM_RANDOM)
1138           gfx.anim_random_frame = last_anim_random_frame;
1139
1140         group->choice_pos++;
1141
1142         Feld[x][y] = group->element_resolved[element_pos];
1143
1144         InitField(x, y, init_game);
1145       }
1146       break;
1147   }
1148
1149 #if 1
1150   if (!init_game)
1151     CheckTriggeredElementChange(x, y, element, CE_CREATION_OF_X);
1152 #endif
1153
1154 #if 0
1155
1156 #if USE_NEW_CUSTOM_VALUE
1157
1158 #if 1
1159   CustomValue[x][y] = GET_NEW_CUSTOM_VALUE(Feld[x][y]);
1160 #else
1161   CustomValue[x][y] = element_info[Feld[x][y]].custom_value_initial;
1162 #endif
1163
1164 #endif
1165
1166 #endif
1167 }
1168
1169 static inline void InitField_WithBug1(int x, int y, boolean init_game)
1170 {
1171   InitField(x, y, init_game);
1172
1173   /* not needed to call InitMovDir() -- already done by InitField()! */
1174   if (game.engine_version < VERSION_IDENT(3,1,0,0) &&
1175       CAN_MOVE(Feld[x][y]))
1176     InitMovDir(x, y);
1177 }
1178
1179 static inline void InitField_WithBug2(int x, int y, boolean init_game)
1180 {
1181   int old_element = Feld[x][y];
1182
1183   InitField(x, y, init_game);
1184
1185   /* not needed to call InitMovDir() -- already done by InitField()! */
1186   if (game.engine_version < VERSION_IDENT(3,1,0,0) &&
1187       CAN_MOVE(old_element) &&
1188       (old_element < EL_MOLE_LEFT || old_element > EL_MOLE_DOWN))
1189     InitMovDir(x, y);
1190
1191   /* this case is in fact a combination of not less than three bugs:
1192      first, it calls InitMovDir() for elements that can move, although this is
1193      already done by InitField(); then, it checks the element that was at this
1194      field _before_ the call to InitField() (which can change it); lastly, it
1195      was not called for "mole with direction" elements, which were treated as
1196      "cannot move" due to (fixed) wrong element initialization in "src/init.c"
1197   */
1198 }
1199
1200 inline void DrawGameValue_Emeralds(int value)
1201 {
1202   DrawText(DX_EMERALDS, DY_EMERALDS, int2str(value, 3), FONT_TEXT_2);
1203 }
1204
1205 inline void DrawGameValue_Dynamite(int value)
1206 {
1207   DrawText(DX_DYNAMITE, DY_DYNAMITE, int2str(value, 3), FONT_TEXT_2);
1208 }
1209
1210 inline void DrawGameValue_Keys(int key[MAX_NUM_KEYS])
1211 {
1212   int base_key_graphic = EL_KEY_1;
1213   int i;
1214
1215   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
1216     base_key_graphic = EL_EM_KEY_1;
1217
1218   /* currently only 4 of 8 possible keys are displayed */
1219   for (i = 0; i < STD_NUM_KEYS; i++)
1220   {
1221     if (key[i])
1222       DrawMiniGraphicExt(drawto, DX_KEYS + i * MINI_TILEX, DY_KEYS,
1223                          el2edimg(base_key_graphic + i));
1224     else
1225       BlitBitmap(graphic_info[IMG_GLOBAL_DOOR].bitmap, drawto,
1226                  DOOR_GFX_PAGEX5 + XX_KEYS + i * MINI_TILEX, YY_KEYS,
1227                  MINI_TILEX, MINI_TILEY, DX_KEYS + i * MINI_TILEX, DY_KEYS);
1228   }
1229 }
1230
1231 inline void DrawGameValue_Score(int value)
1232 {
1233   DrawText(DX_SCORE, DY_SCORE, int2str(value, 5), FONT_TEXT_2);
1234 }
1235
1236 inline void DrawGameValue_Time(int value)
1237 {
1238   if (value < 1000)
1239     DrawText(DX_TIME1, DY_TIME, int2str(value, 3), FONT_TEXT_2);
1240   else
1241     DrawText(DX_TIME2, DY_TIME, int2str(value, 4), FONT_LEVEL_NUMBER);
1242 }
1243
1244 inline void DrawGameValue_Level(int value)
1245 {
1246   if (level_nr < 100)
1247     DrawText(DX_LEVEL, DY_LEVEL, int2str(value, 2), FONT_TEXT_2);
1248   else
1249   {
1250     /* misuse area for displaying emeralds to draw bigger level number */
1251     DrawTextExt(drawto, DX_EMERALDS, DY_EMERALDS,
1252                 int2str(value, 3), FONT_LEVEL_NUMBER, BLIT_OPAQUE);
1253
1254     /* now copy it to the area for displaying level number */
1255     BlitBitmap(drawto, drawto,
1256                DX_EMERALDS, DY_EMERALDS + 1,
1257                getFontWidth(FONT_LEVEL_NUMBER) * 3,
1258                getFontHeight(FONT_LEVEL_NUMBER) - 1,
1259                DX_LEVEL - 1, DY_LEVEL + 1);
1260
1261     /* restore the area for displaying emeralds */
1262     DrawGameValue_Emeralds(local_player->gems_still_needed);
1263
1264     /* yes, this is all really ugly :-) */
1265   }
1266 }
1267
1268 void DrawAllGameValues(int emeralds, int dynamite, int score, int time,
1269                        int key_bits)
1270 {
1271   int key[MAX_NUM_KEYS];
1272   int i;
1273
1274   for (i = 0; i < MAX_NUM_KEYS; i++)
1275     key[i] = key_bits & (1 << i);
1276
1277   DrawGameValue_Level(level_nr);
1278
1279   DrawGameValue_Emeralds(emeralds);
1280   DrawGameValue_Dynamite(dynamite);
1281   DrawGameValue_Score(score);
1282   DrawGameValue_Time(time);
1283
1284   DrawGameValue_Keys(key);
1285 }
1286
1287 void DrawGameDoorValues()
1288 {
1289   int dynamite_state = 0;
1290   int key_bits = 0;
1291   int i, j;
1292
1293   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
1294   {
1295     DrawGameDoorValues_EM();
1296
1297     return;
1298   }
1299
1300 #if 0
1301   DrawGameValue_Level(level_nr);
1302
1303   DrawGameValue_Emeralds(local_player->gems_still_needed);
1304   DrawGameValue_Dynamite(local_player->inventory_size);
1305   DrawGameValue_Score(local_player->score);
1306   DrawGameValue_Time(TimeLeft);
1307
1308 #else
1309
1310   if (game.centered_player_nr == -1)
1311   {
1312     for (i = 0; i < MAX_PLAYERS; i++)
1313     {
1314       for (j = 0; j < MAX_NUM_KEYS; j++)
1315         if (stored_player[i].key[j])
1316           key_bits |= (1 << j);
1317
1318       dynamite_state += stored_player[i].inventory_size;
1319     }
1320
1321 #if 0
1322     DrawGameValue_Keys(stored_player[i].key);
1323 #endif
1324   }
1325   else
1326   {
1327     int player_nr = game.centered_player_nr;
1328
1329     for (i = 0; i < MAX_NUM_KEYS; i++)
1330       if (stored_player[player_nr].key[i])
1331         key_bits |= (1 << i);
1332
1333     dynamite_state = stored_player[player_nr].inventory_size;
1334   }
1335
1336   DrawAllGameValues(local_player->gems_still_needed, dynamite_state,
1337                     local_player->score, TimeLeft, key_bits);
1338 #endif
1339 }
1340
1341 #if 0
1342 static void resolve_group_element(int group_element, int recursion_depth)
1343 {
1344   static int group_nr;
1345   static struct ElementGroupInfo *group;
1346   struct ElementGroupInfo *actual_group = element_info[group_element].group;
1347   int i;
1348
1349   if (recursion_depth > NUM_GROUP_ELEMENTS)     /* recursion too deep */
1350   {
1351     Error(ERR_WARN, "recursion too deep when resolving group element %d",
1352           group_element - EL_GROUP_START + 1);
1353
1354     /* replace element which caused too deep recursion by question mark */
1355     group->element_resolved[group->num_elements_resolved++] = EL_UNKNOWN;
1356
1357     return;
1358   }
1359
1360   if (recursion_depth == 0)                     /* initialization */
1361   {
1362     group = element_info[group_element].group;
1363     group_nr = group_element - EL_GROUP_START;
1364
1365     group->num_elements_resolved = 0;
1366     group->choice_pos = 0;
1367   }
1368
1369   for (i = 0; i < actual_group->num_elements; i++)
1370   {
1371     int element = actual_group->element[i];
1372
1373     if (group->num_elements_resolved == NUM_FILE_ELEMENTS)
1374       break;
1375
1376     if (IS_GROUP_ELEMENT(element))
1377       resolve_group_element(element, recursion_depth + 1);
1378     else
1379     {
1380       group->element_resolved[group->num_elements_resolved++] = element;
1381       element_info[element].in_group[group_nr] = TRUE;
1382     }
1383   }
1384 }
1385 #endif
1386
1387 /*
1388   =============================================================================
1389   InitGameEngine()
1390   -----------------------------------------------------------------------------
1391   initialize game engine due to level / tape version number
1392   =============================================================================
1393 */
1394
1395 static void InitGameEngine()
1396 {
1397   int i, j, k, l, x, y;
1398
1399   /* set game engine from tape file when re-playing, else from level file */
1400   game.engine_version = (tape.playing ? tape.engine_version :
1401                          level.game_version);
1402
1403   /* ---------------------------------------------------------------------- */
1404   /* set flags for bugs and changes according to active game engine version */
1405   /* ---------------------------------------------------------------------- */
1406
1407   /*
1408     Summary of bugfix/change:
1409     Fixed handling for custom elements that change when pushed by the player.
1410
1411     Fixed/changed in version:
1412     3.1.0
1413
1414     Description:
1415     Before 3.1.0, custom elements that "change when pushing" changed directly
1416     after the player started pushing them (until then handled in "DigField()").
1417     Since 3.1.0, these custom elements are not changed until the "pushing"
1418     move of the element is finished (now handled in "ContinueMoving()").
1419
1420     Affected levels/tapes:
1421     The first condition is generally needed for all levels/tapes before version
1422     3.1.0, which might use the old behaviour before it was changed; known tapes
1423     that are affected are some tapes from the level set "Walpurgis Gardens" by
1424     Jamie Cullen.
1425     The second condition is an exception from the above case and is needed for
1426     the special case of tapes recorded with game (not engine!) version 3.1.0 or
1427     above (including some development versions of 3.1.0), but before it was
1428     known that this change would break tapes like the above and was fixed in
1429     3.1.1, so that the changed behaviour was active although the engine version
1430     while recording maybe was before 3.1.0. There is at least one tape that is
1431     affected by this exception, which is the tape for the one-level set "Bug
1432     Machine" by Juergen Bonhagen.
1433   */
1434
1435   game.use_change_when_pushing_bug =
1436     (game.engine_version < VERSION_IDENT(3,1,0,0) &&
1437      !(tape.playing &&
1438        tape.game_version >= VERSION_IDENT(3,1,0,0) &&
1439        tape.game_version <  VERSION_IDENT(3,1,1,0)));
1440
1441   /*
1442     Summary of bugfix/change:
1443     Fixed handling for blocking the field the player leaves when moving.
1444
1445     Fixed/changed in version:
1446     3.1.1
1447
1448     Description:
1449     Before 3.1.1, when "block last field when moving" was enabled, the field
1450     the player is leaving when moving was blocked for the time of the move,
1451     and was directly unblocked afterwards. This resulted in the last field
1452     being blocked for exactly one less than the number of frames of one player
1453     move. Additionally, even when blocking was disabled, the last field was
1454     blocked for exactly one frame.
1455     Since 3.1.1, due to changes in player movement handling, the last field
1456     is not blocked at all when blocking is disabled. When blocking is enabled,
1457     the last field is blocked for exactly the number of frames of one player
1458     move. Additionally, if the player is Murphy, the hero of Supaplex, the
1459     last field is blocked for exactly one more than the number of frames of
1460     one player move.
1461
1462     Affected levels/tapes:
1463     (!!! yet to be determined -- probably many !!!)
1464   */
1465
1466   game.use_block_last_field_bug =
1467     (game.engine_version < VERSION_IDENT(3,1,1,0));
1468
1469   /*
1470     Summary of bugfix/change:
1471     Changed behaviour of CE changes with multiple changes per single frame.
1472
1473     Fixed/changed in version:
1474     3.2.0-6
1475
1476     Description:
1477     Before 3.2.0-6, only one single CE change was allowed in each engine frame.
1478     This resulted in race conditions where CEs seem to behave strange in some
1479     situations (where triggered CE changes were just skipped because there was
1480     already a CE change on that tile in the playfield in that engine frame).
1481     Since 3.2.0-6, this was changed to allow up to MAX_NUM_CHANGES_PER_FRAME.
1482     (The number of changes per frame must be limited in any case, because else
1483     it is easily possible to define CE changes that would result in an infinite
1484     loop, causing the whole game to freeze. The MAX_NUM_CHANGES_PER_FRAME value
1485     should be set large enough so that it would only be reached in cases where
1486     the corresponding CE change conditions run into a loop. Therefore, it seems
1487     to be reasonable to set MAX_NUM_CHANGES_PER_FRAME to the same value as the
1488     maximal number of change pages for custom elements.)
1489
1490     Affected levels/tapes:
1491     Probably many.
1492   */
1493
1494 #if USE_ONLY_ONE_CHANGE_PER_FRAME
1495   game.max_num_changes_per_frame = 1;
1496 #else
1497   game.max_num_changes_per_frame =
1498     (game.engine_version < VERSION_IDENT(3,2,0,6) ? 1 : 32);
1499 #endif
1500
1501   /* ---------------------------------------------------------------------- */
1502
1503   /* default scan direction: scan playfield from top/left to bottom/right */
1504   InitPlayfieldScanMode(CA_ARG_SCAN_MODE_NORMAL);
1505
1506   /* dynamically adjust element properties according to game engine version */
1507   InitElementPropertiesEngine(game.engine_version);
1508
1509 #if 0
1510   printf("level %d: level version == %06d\n", level_nr, level.game_version);
1511   printf("          tape version == %06d [%s] [file: %06d]\n",
1512          tape.engine_version, (tape.playing ? "PLAYING" : "RECORDING"),
1513          tape.file_version);
1514   printf("       => game.engine_version == %06d\n", game.engine_version);
1515 #endif
1516
1517 #if 0
1518   /* ---------- recursively resolve group elements ------------------------- */
1519
1520   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1521     for (j = 0; j < NUM_GROUP_ELEMENTS; j++)
1522       element_info[i].in_group[j] = FALSE;
1523
1524   for (i = 0; i < NUM_GROUP_ELEMENTS; i++)
1525     resolve_group_element(EL_GROUP_START + i, 0);
1526 #endif
1527
1528   /* ---------- initialize player's initial move delay --------------------- */
1529
1530 #if 1
1531   /* dynamically adjust player properties according to level information */
1532   game.initial_move_delay_value =
1533     get_move_delay_from_stepsize(level.initial_player_stepsize);
1534 #else
1535   /* dynamically adjust player properties according to level information */
1536   game.initial_move_delay_value =
1537     (level.double_speed ? MOVE_DELAY_HIGH_SPEED : MOVE_DELAY_NORMAL_SPEED);
1538 #endif
1539
1540   /* dynamically adjust player properties according to game engine version */
1541   game.initial_move_delay = (game.engine_version <= VERSION_IDENT(2,0,1,0) ?
1542                              game.initial_move_delay_value : 0);
1543
1544   /* ---------- initialize player's initial push delay --------------------- */
1545
1546   /* dynamically adjust player properties according to game engine version */
1547   game.initial_push_delay_value =
1548     (game.engine_version < VERSION_IDENT(3,0,7,1) ? 5 : -1);
1549
1550   /* ---------- initialize changing elements ------------------------------- */
1551
1552   /* initialize changing elements information */
1553   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1554   {
1555     struct ElementInfo *ei = &element_info[i];
1556
1557     /* this pointer might have been changed in the level editor */
1558     ei->change = &ei->change_page[0];
1559
1560     if (!IS_CUSTOM_ELEMENT(i))
1561     {
1562       ei->change->target_element = EL_EMPTY_SPACE;
1563       ei->change->delay_fixed = 0;
1564       ei->change->delay_random = 0;
1565       ei->change->delay_frames = 1;
1566     }
1567
1568     for (j = 0; j < NUM_CHANGE_EVENTS; j++)
1569     {
1570       ei->has_change_event[j] = FALSE;
1571
1572       ei->event_page_nr[j] = 0;
1573       ei->event_page[j] = &ei->change_page[0];
1574     }
1575   }
1576
1577   /* add changing elements from pre-defined list */
1578   for (i = 0; change_delay_list[i].element != EL_UNDEFINED; i++)
1579   {
1580     struct ChangingElementInfo *ch_delay = &change_delay_list[i];
1581     struct ElementInfo *ei = &element_info[ch_delay->element];
1582
1583     ei->change->target_element       = ch_delay->target_element;
1584     ei->change->delay_fixed          = ch_delay->change_delay;
1585
1586     ei->change->pre_change_function  = ch_delay->pre_change_function;
1587     ei->change->change_function      = ch_delay->change_function;
1588     ei->change->post_change_function = ch_delay->post_change_function;
1589
1590     ei->change->can_change = TRUE;
1591     ei->change->can_change_or_has_action = TRUE;
1592
1593     ei->has_change_event[CE_DELAY] = TRUE;
1594
1595     SET_PROPERTY(ch_delay->element, EP_CAN_CHANGE, TRUE);
1596     SET_PROPERTY(ch_delay->element, EP_CAN_CHANGE_OR_HAS_ACTION, TRUE);
1597   }
1598
1599   /* ---------- initialize internal run-time variables ------------- */
1600
1601   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
1602   {
1603     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
1604
1605     for (j = 0; j < ei->num_change_pages; j++)
1606     {
1607       ei->change_page[j].can_change_or_has_action =
1608         (ei->change_page[j].can_change |
1609          ei->change_page[j].has_action);
1610     }
1611   }
1612
1613   /* add change events from custom element configuration */
1614   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
1615   {
1616     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
1617
1618     for (j = 0; j < ei->num_change_pages; j++)
1619     {
1620       if (!ei->change_page[j].can_change_or_has_action)
1621         continue;
1622
1623       for (k = 0; k < NUM_CHANGE_EVENTS; k++)
1624       {
1625         /* only add event page for the first page found with this event */
1626         if (ei->change_page[j].has_event[k] && !(ei->has_change_event[k]))
1627         {
1628           ei->has_change_event[k] = TRUE;
1629
1630           ei->event_page_nr[k] = j;
1631           ei->event_page[k] = &ei->change_page[j];
1632         }
1633       }
1634     }
1635   }
1636
1637   /* ---------- initialize run-time trigger player and element ------------- */
1638
1639   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
1640   {
1641     struct ElementInfo *ei = &element_info[EL_CUSTOM_START + i];
1642
1643     for (j = 0; j < ei->num_change_pages; j++)
1644     {
1645       ei->change_page[j].actual_trigger_element = EL_EMPTY;
1646       ei->change_page[j].actual_trigger_player = EL_PLAYER_1;
1647       ei->change_page[j].actual_trigger_side = CH_SIDE_NONE;
1648       ei->change_page[j].actual_trigger_ce_value = 0;
1649     }
1650   }
1651
1652   /* ---------- initialize trigger events ---------------------------------- */
1653
1654   /* initialize trigger events information */
1655   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1656     for (j = 0; j < NUM_CHANGE_EVENTS; j++)
1657       trigger_events[i][j] = FALSE;
1658
1659   /* add trigger events from element change event properties */
1660   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1661   {
1662     struct ElementInfo *ei = &element_info[i];
1663
1664     for (j = 0; j < ei->num_change_pages; j++)
1665     {
1666       if (!ei->change_page[j].can_change_or_has_action)
1667         continue;
1668
1669       if (ei->change_page[j].has_event[CE_BY_OTHER_ACTION])
1670       {
1671         int trigger_element = ei->change_page[j].trigger_element;
1672
1673         for (k = 0; k < NUM_CHANGE_EVENTS; k++)
1674         {
1675           if (ei->change_page[j].has_event[k])
1676           {
1677             if (IS_GROUP_ELEMENT(trigger_element))
1678             {
1679               struct ElementGroupInfo *group =
1680                 element_info[trigger_element].group;
1681
1682               for (l = 0; l < group->num_elements_resolved; l++)
1683                 trigger_events[group->element_resolved[l]][k] = TRUE;
1684             }
1685             else
1686               trigger_events[trigger_element][k] = TRUE;
1687           }
1688         }
1689       }
1690     }
1691   }
1692
1693   /* ---------- initialize push delay -------------------------------------- */
1694
1695   /* initialize push delay values to default */
1696   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1697   {
1698     if (!IS_CUSTOM_ELEMENT(i))
1699     {
1700       element_info[i].push_delay_fixed  = game.default_push_delay_fixed;
1701       element_info[i].push_delay_random = game.default_push_delay_random;
1702     }
1703   }
1704
1705   /* set push delay value for certain elements from pre-defined list */
1706   for (i = 0; push_delay_list[i].element != EL_UNDEFINED; i++)
1707   {
1708     int e = push_delay_list[i].element;
1709
1710     element_info[e].push_delay_fixed  = push_delay_list[i].push_delay_fixed;
1711     element_info[e].push_delay_random = push_delay_list[i].push_delay_random;
1712   }
1713
1714   /* set push delay value for Supaplex elements for newer engine versions */
1715   if (game.engine_version >= VERSION_IDENT(3,1,0,0))
1716   {
1717     for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1718     {
1719       if (IS_SP_ELEMENT(i))
1720       {
1721         /* set SP push delay to just enough to push under a falling zonk */
1722         int delay = (game.engine_version >= VERSION_IDENT(3,1,1,0) ? 8 : 6);
1723
1724         element_info[i].push_delay_fixed  = delay;
1725         element_info[i].push_delay_random = 0;
1726       }
1727     }
1728   }
1729
1730   /* ---------- initialize move stepsize ----------------------------------- */
1731
1732   /* initialize move stepsize values to default */
1733   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1734     if (!IS_CUSTOM_ELEMENT(i))
1735       element_info[i].move_stepsize = MOVE_STEPSIZE_NORMAL;
1736
1737   /* set move stepsize value for certain elements from pre-defined list */
1738   for (i = 0; move_stepsize_list[i].element != EL_UNDEFINED; i++)
1739   {
1740     int e = move_stepsize_list[i].element;
1741
1742     element_info[e].move_stepsize = move_stepsize_list[i].move_stepsize;
1743   }
1744
1745   /* ---------- initialize collect score ----------------------------------- */
1746
1747   /* initialize collect score values for custom elements from initial value */
1748   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1749     if (IS_CUSTOM_ELEMENT(i))
1750       element_info[i].collect_score = element_info[i].collect_score_initial;
1751
1752   /* ---------- initialize collect count ----------------------------------- */
1753
1754   /* initialize collect count values for non-custom elements */
1755   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1756     if (!IS_CUSTOM_ELEMENT(i))
1757       element_info[i].collect_count_initial = 0;
1758
1759   /* add collect count values for all elements from pre-defined list */
1760   for (i = 0; collect_count_list[i].element != EL_UNDEFINED; i++)
1761     element_info[collect_count_list[i].element].collect_count_initial =
1762       collect_count_list[i].count;
1763
1764   /* ---------- initialize access direction -------------------------------- */
1765
1766   /* initialize access direction values to default (access from every side) */
1767   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1768     if (!IS_CUSTOM_ELEMENT(i))
1769       element_info[i].access_direction = MV_ALL_DIRECTIONS;
1770
1771   /* set access direction value for certain elements from pre-defined list */
1772   for (i = 0; access_direction_list[i].element != EL_UNDEFINED; i++)
1773     element_info[access_direction_list[i].element].access_direction =
1774       access_direction_list[i].direction;
1775
1776   /* ---------- initialize explosion content ------------------------------- */
1777   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
1778   {
1779     if (IS_CUSTOM_ELEMENT(i))
1780       continue;
1781
1782     for (y = 0; y < 3; y++) for (x = 0; x < 3; x++)
1783     {
1784       /* (content for EL_YAMYAM set at run-time with game.yamyam_content_nr) */
1785
1786       element_info[i].content.e[x][y] =
1787         (i == EL_PLAYER_1 ? EL_EMERALD_YELLOW :
1788          i == EL_PLAYER_2 ? EL_EMERALD_RED :
1789          i == EL_PLAYER_3 ? EL_EMERALD :
1790          i == EL_PLAYER_4 ? EL_EMERALD_PURPLE :
1791          i == EL_MOLE ? EL_EMERALD_RED :
1792          i == EL_PENGUIN ? EL_EMERALD_PURPLE :
1793          i == EL_BUG ? (x == 1 && y == 1 ? EL_DIAMOND : EL_EMERALD) :
1794          i == EL_BD_BUTTERFLY ? EL_BD_DIAMOND :
1795          i == EL_SP_ELECTRON ? EL_SP_INFOTRON :
1796          i == EL_AMOEBA_TO_DIAMOND ? level.amoeba_content :
1797          i == EL_WALL_EMERALD ? EL_EMERALD :
1798          i == EL_WALL_DIAMOND ? EL_DIAMOND :
1799          i == EL_WALL_BD_DIAMOND ? EL_BD_DIAMOND :
1800          i == EL_WALL_EMERALD_YELLOW ? EL_EMERALD_YELLOW :
1801          i == EL_WALL_EMERALD_RED ? EL_EMERALD_RED :
1802          i == EL_WALL_EMERALD_PURPLE ? EL_EMERALD_PURPLE :
1803          i == EL_WALL_PEARL ? EL_PEARL :
1804          i == EL_WALL_CRYSTAL ? EL_CRYSTAL :
1805          EL_EMPTY);
1806     }
1807   }
1808 }
1809
1810 int get_num_special_action(int element, int action_first, int action_last)
1811 {
1812   int num_special_action = 0;
1813   int i, j;
1814
1815   for (i = action_first; i <= action_last; i++)
1816   {
1817     boolean found = FALSE;
1818
1819     for (j = 0; j < NUM_DIRECTIONS; j++)
1820       if (el_act_dir2img(element, i, j) !=
1821           el_act_dir2img(element, ACTION_DEFAULT, j))
1822         found = TRUE;
1823
1824     if (found)
1825       num_special_action++;
1826     else
1827       break;
1828   }
1829
1830 #if 0
1831   printf("::: %d->%d: %d\n", action_first, action_last, num_special_action);
1832 #endif
1833
1834   return num_special_action;
1835 }
1836
1837 /*
1838   =============================================================================
1839   InitGame()
1840   -----------------------------------------------------------------------------
1841   initialize and start new game
1842   =============================================================================
1843 */
1844
1845 void InitGame()
1846 {
1847   boolean emulate_bd = TRUE;    /* unless non-BOULDERDASH elements found */
1848   boolean emulate_sb = TRUE;    /* unless non-SOKOBAN     elements found */
1849   boolean emulate_sp = TRUE;    /* unless non-SUPAPLEX    elements found */
1850   int i, j, x, y;
1851
1852   InitGameEngine();
1853
1854   /* don't play tapes over network */
1855   network_playing = (options.network && !tape.playing);
1856
1857   for (i = 0; i < MAX_PLAYERS; i++)
1858   {
1859     struct PlayerInfo *player = &stored_player[i];
1860
1861     player->index_nr = i;
1862     player->index_bit = (1 << i);
1863     player->element_nr = EL_PLAYER_1 + i;
1864
1865     player->present = FALSE;
1866     player->active = FALSE;
1867
1868     player->action = 0;
1869     player->effective_action = 0;
1870     player->programmed_action = 0;
1871
1872     player->score = 0;
1873     player->gems_still_needed = level.gems_needed;
1874     player->sokobanfields_still_needed = 0;
1875     player->lights_still_needed = 0;
1876     player->friends_still_needed = 0;
1877
1878     for (j = 0; j < MAX_NUM_KEYS; j++)
1879       player->key[j] = FALSE;
1880
1881     player->dynabomb_count = 0;
1882     player->dynabomb_size = 1;
1883     player->dynabombs_left = 0;
1884     player->dynabomb_xl = FALSE;
1885
1886     player->MovDir = MV_NONE;
1887     player->MovPos = 0;
1888     player->GfxPos = 0;
1889     player->GfxDir = MV_NONE;
1890     player->GfxAction = ACTION_DEFAULT;
1891     player->Frame = 0;
1892     player->StepFrame = 0;
1893
1894     player->use_murphy = FALSE;
1895     player->artwork_element =
1896       (level.use_artwork_element[i] ? level.artwork_element[i] :
1897        player->element_nr);
1898
1899     player->block_last_field = FALSE;   /* initialized in InitPlayerField() */
1900     player->block_delay_adjustment = 0; /* initialized in InitPlayerField() */
1901
1902     player->can_fall_into_acid = CAN_MOVE_INTO_ACID(player->element_nr);
1903
1904     player->actual_frame_counter = 0;
1905
1906     player->step_counter = 0;
1907
1908     player->last_move_dir = MV_NONE;
1909
1910     player->is_waiting = FALSE;
1911     player->is_moving = FALSE;
1912     player->is_auto_moving = FALSE;
1913     player->is_digging = FALSE;
1914     player->is_snapping = FALSE;
1915     player->is_collecting = FALSE;
1916     player->is_pushing = FALSE;
1917     player->is_switching = FALSE;
1918     player->is_dropping = FALSE;
1919     player->is_dropping_pressed = FALSE;
1920
1921     player->is_bored = FALSE;
1922     player->is_sleeping = FALSE;
1923
1924     player->frame_counter_bored = -1;
1925     player->frame_counter_sleeping = -1;
1926
1927     player->anim_delay_counter = 0;
1928     player->post_delay_counter = 0;
1929
1930     player->dir_waiting = MV_NONE;
1931     player->action_waiting = ACTION_DEFAULT;
1932     player->last_action_waiting = ACTION_DEFAULT;
1933     player->special_action_bored = ACTION_DEFAULT;
1934     player->special_action_sleeping = ACTION_DEFAULT;
1935
1936 #if 1
1937     /* cannot be set here -- could be modified in Init[Player]Field() below */
1938 #else
1939     /* set number of special actions for bored and sleeping animation */
1940     player->num_special_action_bored =
1941       get_num_special_action(player->artwork_element,
1942                              ACTION_BORING_1, ACTION_BORING_LAST);
1943     player->num_special_action_sleeping =
1944       get_num_special_action(player->artwork_element,
1945                              ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
1946 #endif
1947
1948     player->switch_x = -1;
1949     player->switch_y = -1;
1950
1951     player->drop_x = -1;
1952     player->drop_y = -1;
1953
1954     player->show_envelope = 0;
1955
1956 #if 1
1957     SetPlayerMoveSpeed(player, level.initial_player_stepsize, TRUE);
1958 #else
1959     player->move_delay       = game.initial_move_delay;
1960     player->move_delay_value = game.initial_move_delay_value;
1961
1962     player->move_delay_value_next = -1;
1963
1964     player->move_delay_reset_counter = 0;
1965
1966     player->cannot_move = FALSE;
1967 #endif
1968
1969     player->push_delay       = -1;      /* initialized when pushing starts */
1970     player->push_delay_value = game.initial_push_delay_value;
1971
1972     player->drop_delay = 0;
1973     player->drop_pressed_delay = 0;
1974
1975     player->last_jx = player->last_jy = 0;
1976     player->jx = player->jy = 0;
1977
1978     player->shield_normal_time_left = 0;
1979     player->shield_deadly_time_left = 0;
1980
1981     player->inventory_infinite_element = EL_UNDEFINED;
1982     player->inventory_size = 0;
1983
1984     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
1985     SnapField(player, 0, 0);
1986
1987     player->LevelSolved = FALSE;
1988     player->GameOver = FALSE;
1989   }
1990
1991   network_player_action_received = FALSE;
1992
1993 #if defined(NETWORK_AVALIABLE)
1994   /* initial null action */
1995   if (network_playing)
1996     SendToServer_MovePlayer(MV_NONE);
1997 #endif
1998
1999   ZX = ZY = -1;
2000   ExitX = ExitY = -1;
2001
2002   FrameCounter = 0;
2003   TimeFrames = 0;
2004   TimePlayed = 0;
2005   TimeLeft = level.time;
2006   TapeTime = 0;
2007
2008   ScreenMovDir = MV_NONE;
2009   ScreenMovPos = 0;
2010   ScreenGfxPos = 0;
2011
2012   ScrollStepSize = 0;   /* will be correctly initialized by ScrollScreen() */
2013
2014   AllPlayersGone = FALSE;
2015
2016   game.yamyam_content_nr = 0;
2017   game.magic_wall_active = FALSE;
2018   game.magic_wall_time_left = 0;
2019   game.light_time_left = 0;
2020   game.timegate_time_left = 0;
2021   game.switchgate_pos = 0;
2022   game.wind_direction = level.wind_direction_initial;
2023   game.gravity = level.initial_gravity;
2024   game.explosions_delayed = TRUE;
2025
2026   game.lenses_time_left = 0;
2027   game.magnify_time_left = 0;
2028
2029   game.ball_state = level.ball_state_initial;
2030   game.ball_content_nr = 0;
2031
2032   game.envelope_active = FALSE;
2033
2034   game.centered_player_nr = game.centered_player_nr_next = -1;  /* focus all */
2035   game.set_centered_player = FALSE;
2036
2037   for (i = 0; i < NUM_BELTS; i++)
2038   {
2039     game.belt_dir[i] = MV_NONE;
2040     game.belt_dir_nr[i] = 3;            /* not moving, next moving left */
2041   }
2042
2043   for (i = 0; i < MAX_NUM_AMOEBA; i++)
2044     AmoebaCnt[i] = AmoebaCnt2[i] = 0;
2045
2046 #if 1
2047   SCAN_PLAYFIELD(x, y)
2048 #else
2049   for (x = 0; x < lev_fieldx; x++) for (y = 0; y < lev_fieldy; y++)
2050 #endif
2051   {
2052     Feld[x][y] = level.field[x][y];
2053     MovPos[x][y] = MovDir[x][y] = MovDelay[x][y] = 0;
2054     ChangeDelay[x][y] = 0;
2055     ChangePage[x][y] = -1;
2056 #if USE_NEW_CUSTOM_VALUE
2057     CustomValue[x][y] = 0;              /* initialized in InitField() */
2058 #endif
2059     Store[x][y] = Store2[x][y] = StorePlayer[x][y] = Back[x][y] = 0;
2060     AmoebaNr[x][y] = 0;
2061     WasJustMoving[x][y] = 0;
2062     WasJustFalling[x][y] = 0;
2063     CheckCollision[x][y] = 0;
2064     Stop[x][y] = FALSE;
2065     Pushed[x][y] = FALSE;
2066
2067     ChangeCount[x][y] = 0;
2068     ChangeEvent[x][y] = -1;
2069
2070     ExplodePhase[x][y] = 0;
2071     ExplodeDelay[x][y] = 0;
2072     ExplodeField[x][y] = EX_TYPE_NONE;
2073
2074     RunnerVisit[x][y] = 0;
2075     PlayerVisit[x][y] = 0;
2076
2077     GfxFrame[x][y] = 0;
2078     GfxRandom[x][y] = INIT_GFX_RANDOM();
2079     GfxElement[x][y] = EL_UNDEFINED;
2080     GfxAction[x][y] = ACTION_DEFAULT;
2081     GfxDir[x][y] = MV_NONE;
2082   }
2083
2084 #if 1
2085   SCAN_PLAYFIELD(x, y)
2086 #else
2087   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
2088 #endif
2089   {
2090     if (emulate_bd && !IS_BD_ELEMENT(Feld[x][y]))
2091       emulate_bd = FALSE;
2092     if (emulate_sb && !IS_SB_ELEMENT(Feld[x][y]))
2093       emulate_sb = FALSE;
2094     if (emulate_sp && !IS_SP_ELEMENT(Feld[x][y]))
2095       emulate_sp = FALSE;
2096
2097     InitField(x, y, TRUE);
2098   }
2099
2100   InitBeltMovement();
2101
2102   for (i = 0; i < MAX_PLAYERS; i++)
2103   {
2104     struct PlayerInfo *player = &stored_player[i];
2105
2106 #if 1
2107     /* set number of special actions for bored and sleeping animation */
2108     player->num_special_action_bored =
2109       get_num_special_action(player->artwork_element,
2110                              ACTION_BORING_1, ACTION_BORING_LAST);
2111     player->num_special_action_sleeping =
2112       get_num_special_action(player->artwork_element,
2113                              ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
2114 #endif
2115
2116   }
2117
2118   game.emulation = (emulate_bd ? EMU_BOULDERDASH :
2119                     emulate_sb ? EMU_SOKOBAN :
2120                     emulate_sp ? EMU_SUPAPLEX : EMU_NONE);
2121
2122 #if USE_NEW_ALL_SLIPPERY
2123   /* initialize type of slippery elements */
2124   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2125   {
2126     if (!IS_CUSTOM_ELEMENT(i))
2127     {
2128       /* default: elements slip down either to the left or right randomly */
2129       element_info[i].slippery_type = SLIPPERY_ANY_RANDOM;
2130
2131       /* SP style elements prefer to slip down on the left side */
2132       if (game.engine_version >= VERSION_IDENT(3,1,1,0) && IS_SP_ELEMENT(i))
2133         element_info[i].slippery_type = SLIPPERY_ANY_LEFT_RIGHT;
2134
2135       /* BD style elements prefer to slip down on the left side */
2136       if (game.emulation == EMU_BOULDERDASH)
2137         element_info[i].slippery_type = SLIPPERY_ANY_LEFT_RIGHT;
2138     }
2139   }
2140 #endif
2141
2142   /* initialize explosion and ignition delay */
2143   for (i = 0; i < MAX_NUM_ELEMENTS; i++)
2144   {
2145     if (!IS_CUSTOM_ELEMENT(i))
2146     {
2147       int num_phase = 8;
2148       int delay = (((IS_SP_ELEMENT(i) && i != EL_EMPTY_SPACE) &&
2149                     game.engine_version >= VERSION_IDENT(3,1,0,0)) ||
2150                    game.emulation == EMU_SUPAPLEX ? 3 : 2);
2151       int last_phase = (num_phase + 1) * delay;
2152       int half_phase = (num_phase / 2) * delay;
2153
2154       element_info[i].explosion_delay = last_phase - 1;
2155       element_info[i].ignition_delay = half_phase;
2156
2157       if (i == EL_BLACK_ORB)
2158         element_info[i].ignition_delay = 1;
2159     }
2160
2161 #if 0
2162     if (element_info[i].explosion_delay < 1)    /* !!! check again !!! */
2163       element_info[i].explosion_delay = 1;
2164
2165     if (element_info[i].ignition_delay < 1)     /* !!! check again !!! */
2166       element_info[i].ignition_delay = 1;
2167 #endif
2168   }
2169
2170   /* correct non-moving belts to start moving left */
2171   for (i = 0; i < NUM_BELTS; i++)
2172     if (game.belt_dir[i] == MV_NONE)
2173       game.belt_dir_nr[i] = 3;          /* not moving, next moving left */
2174
2175   /* check if any connected player was not found in playfield */
2176   for (i = 0; i < MAX_PLAYERS; i++)
2177   {
2178     struct PlayerInfo *player = &stored_player[i];
2179
2180     if (player->connected && !player->present)
2181     {
2182       for (j = 0; j < MAX_PLAYERS; j++)
2183       {
2184         struct PlayerInfo *some_player = &stored_player[j];
2185         int jx = some_player->jx, jy = some_player->jy;
2186
2187         /* assign first free player found that is present in the playfield */
2188         if (some_player->present && !some_player->connected)
2189         {
2190           player->present = TRUE;
2191           player->active = TRUE;
2192
2193           some_player->present = FALSE;
2194           some_player->active = FALSE;
2195
2196 #if 0
2197           player->element_nr = some_player->element_nr;
2198 #endif
2199
2200           player->artwork_element = some_player->artwork_element;
2201
2202           player->block_last_field       = some_player->block_last_field;
2203           player->block_delay_adjustment = some_player->block_delay_adjustment;
2204
2205           StorePlayer[jx][jy] = player->element_nr;
2206           player->jx = player->last_jx = jx;
2207           player->jy = player->last_jy = jy;
2208
2209           break;
2210         }
2211       }
2212     }
2213   }
2214
2215   if (tape.playing)
2216   {
2217     /* when playing a tape, eliminate all players who do not participate */
2218
2219     for (i = 0; i < MAX_PLAYERS; i++)
2220     {
2221       if (stored_player[i].active && !tape.player_participates[i])
2222       {
2223         struct PlayerInfo *player = &stored_player[i];
2224         int jx = player->jx, jy = player->jy;
2225
2226         player->active = FALSE;
2227         StorePlayer[jx][jy] = 0;
2228         Feld[jx][jy] = EL_EMPTY;
2229       }
2230     }
2231   }
2232   else if (!options.network && !setup.team_mode)        /* && !tape.playing */
2233   {
2234     /* when in single player mode, eliminate all but the first active player */
2235
2236     for (i = 0; i < MAX_PLAYERS; i++)
2237     {
2238       if (stored_player[i].active)
2239       {
2240         for (j = i + 1; j < MAX_PLAYERS; j++)
2241         {
2242           if (stored_player[j].active)
2243           {
2244             struct PlayerInfo *player = &stored_player[j];
2245             int jx = player->jx, jy = player->jy;
2246
2247             player->active = FALSE;
2248             player->present = FALSE;
2249
2250             StorePlayer[jx][jy] = 0;
2251             Feld[jx][jy] = EL_EMPTY;
2252           }
2253         }
2254       }
2255     }
2256   }
2257
2258   /* when recording the game, store which players take part in the game */
2259   if (tape.recording)
2260   {
2261     for (i = 0; i < MAX_PLAYERS; i++)
2262       if (stored_player[i].active)
2263         tape.player_participates[i] = TRUE;
2264   }
2265
2266   if (options.debug)
2267   {
2268     for (i = 0; i < MAX_PLAYERS; i++)
2269     {
2270       struct PlayerInfo *player = &stored_player[i];
2271
2272       printf("Player %d: present == %d, connected == %d, active == %d.\n",
2273              i+1,
2274              player->present,
2275              player->connected,
2276              player->active);
2277       if (local_player == player)
2278         printf("Player  %d is local player.\n", i+1);
2279     }
2280   }
2281
2282   if (BorderElement == EL_EMPTY)
2283   {
2284     SBX_Left = 0;
2285     SBX_Right = lev_fieldx - SCR_FIELDX;
2286     SBY_Upper = 0;
2287     SBY_Lower = lev_fieldy - SCR_FIELDY;
2288   }
2289   else
2290   {
2291     SBX_Left = -1;
2292     SBX_Right = lev_fieldx - SCR_FIELDX + 1;
2293     SBY_Upper = -1;
2294     SBY_Lower = lev_fieldy - SCR_FIELDY + 1;
2295   }
2296
2297   if (lev_fieldx + (SBX_Left == -1 ? 2 : 0) <= SCR_FIELDX)
2298     SBX_Left = SBX_Right = -1 * (SCR_FIELDX - lev_fieldx) / 2;
2299
2300   if (lev_fieldy + (SBY_Upper == -1 ? 2 : 0) <= SCR_FIELDY)
2301     SBY_Upper = SBY_Lower = -1 * (SCR_FIELDY - lev_fieldy) / 2;
2302
2303   /* if local player not found, look for custom element that might create
2304      the player (make some assumptions about the right custom element) */
2305   if (!local_player->present)
2306   {
2307     int start_x = 0, start_y = 0;
2308     int found_rating = 0;
2309     int found_element = EL_UNDEFINED;
2310     int player_nr = local_player->index_nr;
2311
2312 #if 1
2313     SCAN_PLAYFIELD(x, y)
2314 #else
2315     for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
2316 #endif
2317     {
2318       int element = Feld[x][y];
2319       int content;
2320       int xx, yy;
2321       boolean is_player;
2322
2323       if (level.use_start_element[player_nr] &&
2324           level.start_element[player_nr] == element &&
2325           found_rating < 4)
2326       {
2327         start_x = x;
2328         start_y = y;
2329
2330         found_rating = 4;
2331         found_element = element;
2332       }
2333
2334       if (!IS_CUSTOM_ELEMENT(element))
2335         continue;
2336
2337       if (CAN_CHANGE(element))
2338       {
2339         for (i = 0; i < element_info[element].num_change_pages; i++)
2340         {
2341           /* check for player created from custom element as single target */
2342           content = element_info[element].change_page[i].target_element;
2343           is_player = ELEM_IS_PLAYER(content);
2344
2345           if (is_player && (found_rating < 3 || element < found_element))
2346           {
2347             start_x = x;
2348             start_y = y;
2349
2350             found_rating = 3;
2351             found_element = element;
2352           }
2353         }
2354       }
2355
2356       for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3; xx++)
2357       {
2358         /* check for player created from custom element as explosion content */
2359         content = element_info[element].content.e[xx][yy];
2360         is_player = ELEM_IS_PLAYER(content);
2361
2362         if (is_player && (found_rating < 2 || element < found_element))
2363         {
2364           start_x = x + xx - 1;
2365           start_y = y + yy - 1;
2366
2367           found_rating = 2;
2368           found_element = element;
2369         }
2370
2371         if (!CAN_CHANGE(element))
2372           continue;
2373
2374         for (i = 0; i < element_info[element].num_change_pages; i++)
2375         {
2376           /* check for player created from custom element as extended target */
2377           content =
2378             element_info[element].change_page[i].target_content.e[xx][yy];
2379
2380           is_player = ELEM_IS_PLAYER(content);
2381
2382           if (is_player && (found_rating < 1 || element < found_element))
2383           {
2384             start_x = x + xx - 1;
2385             start_y = y + yy - 1;
2386
2387             found_rating = 1;
2388             found_element = element;
2389           }
2390         }
2391       }
2392     }
2393
2394     scroll_x = (start_x < SBX_Left  + MIDPOSX ? SBX_Left :
2395                 start_x > SBX_Right + MIDPOSX ? SBX_Right :
2396                 start_x - MIDPOSX);
2397
2398     scroll_y = (start_y < SBY_Upper + MIDPOSY ? SBY_Upper :
2399                 start_y > SBY_Lower + MIDPOSY ? SBY_Lower :
2400                 start_y - MIDPOSY);
2401   }
2402   else
2403   {
2404     scroll_x = (local_player->jx < SBX_Left  + MIDPOSX ? SBX_Left :
2405                 local_player->jx > SBX_Right + MIDPOSX ? SBX_Right :
2406                 local_player->jx - MIDPOSX);
2407
2408     scroll_y = (local_player->jy < SBY_Upper + MIDPOSY ? SBY_Upper :
2409                 local_player->jy > SBY_Lower + MIDPOSY ? SBY_Lower :
2410                 local_player->jy - MIDPOSY);
2411   }
2412
2413   if (!game.restart_level)
2414     CloseDoor(DOOR_CLOSE_1);
2415
2416   /* !!! FIX THIS (START) !!! */
2417   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
2418   {
2419     InitGameEngine_EM();
2420   }
2421   else
2422   {
2423     DrawLevel();
2424     DrawAllPlayers();
2425
2426     /* after drawing the level, correct some elements */
2427     if (game.timegate_time_left == 0)
2428       CloseAllOpenTimegates();
2429
2430     if (setup.soft_scrolling)
2431       BlitBitmap(fieldbuffer, backbuffer, FX, FY, SXSIZE, SYSIZE, SX, SY);
2432
2433     redraw_mask |= REDRAW_FROM_BACKBUFFER;
2434     FadeToFront();
2435   }
2436   /* !!! FIX THIS (END) !!! */
2437
2438   if (!game.restart_level)
2439   {
2440     /* copy default game door content to main double buffer */
2441     BlitBitmap(graphic_info[IMG_GLOBAL_DOOR].bitmap, drawto,
2442                DOOR_GFX_PAGEX5, DOOR_GFX_PAGEY1, DXSIZE, DYSIZE, DX, DY);
2443   }
2444
2445   DrawGameDoorValues();
2446
2447   if (!game.restart_level)
2448   {
2449     UnmapGameButtons();
2450     UnmapTapeButtons();
2451     game_gadget[SOUND_CTRL_ID_MUSIC]->checked = setup.sound_music;
2452     game_gadget[SOUND_CTRL_ID_LOOPS]->checked = setup.sound_loops;
2453     game_gadget[SOUND_CTRL_ID_SIMPLE]->checked = setup.sound_simple;
2454     MapGameButtons();
2455     MapTapeButtons();
2456
2457     /* copy actual game door content to door double buffer for OpenDoor() */
2458     BlitBitmap(drawto, bitmap_db_door,
2459                DX, DY, DXSIZE, DYSIZE, DOOR_GFX_PAGEX1, DOOR_GFX_PAGEY1);
2460
2461     OpenDoor(DOOR_OPEN_ALL);
2462
2463     PlaySoundStereo(SND_GAME_STARTING, SOUND_MIDDLE);
2464
2465     if (setup.sound_music)
2466       PlayLevelMusic();
2467
2468     KeyboardAutoRepeatOffUnlessAutoplay();
2469
2470     if (options.debug)
2471     {
2472       for (i = 0; i < MAX_PLAYERS; i++)
2473         printf("Player %d %sactive.\n",
2474                i + 1, (stored_player[i].active ? "" : "not "));
2475     }
2476   }
2477
2478   game.restart_level = FALSE;
2479 }
2480
2481 void UpdateEngineValues(int actual_scroll_x, int actual_scroll_y)
2482 {
2483   /* this is used for non-R'n'D game engines to update certain engine values */
2484
2485   /* needed to determine if sounds are played within the visible screen area */
2486   scroll_x = actual_scroll_x;
2487   scroll_y = actual_scroll_y;
2488 }
2489
2490 void InitMovDir(int x, int y)
2491 {
2492   int i, element = Feld[x][y];
2493   static int xy[4][2] =
2494   {
2495     {  0, +1 },
2496     { +1,  0 },
2497     {  0, -1 },
2498     { -1,  0 }
2499   };
2500   static int direction[3][4] =
2501   {
2502     { MV_RIGHT, MV_UP,   MV_LEFT,  MV_DOWN },
2503     { MV_LEFT,  MV_DOWN, MV_RIGHT, MV_UP },
2504     { MV_LEFT,  MV_RIGHT, MV_UP, MV_DOWN }
2505   };
2506
2507   switch(element)
2508   {
2509     case EL_BUG_RIGHT:
2510     case EL_BUG_UP:
2511     case EL_BUG_LEFT:
2512     case EL_BUG_DOWN:
2513       Feld[x][y] = EL_BUG;
2514       MovDir[x][y] = direction[0][element - EL_BUG_RIGHT];
2515       break;
2516
2517     case EL_SPACESHIP_RIGHT:
2518     case EL_SPACESHIP_UP:
2519     case EL_SPACESHIP_LEFT:
2520     case EL_SPACESHIP_DOWN:
2521       Feld[x][y] = EL_SPACESHIP;
2522       MovDir[x][y] = direction[0][element - EL_SPACESHIP_RIGHT];
2523       break;
2524
2525     case EL_BD_BUTTERFLY_RIGHT:
2526     case EL_BD_BUTTERFLY_UP:
2527     case EL_BD_BUTTERFLY_LEFT:
2528     case EL_BD_BUTTERFLY_DOWN:
2529       Feld[x][y] = EL_BD_BUTTERFLY;
2530       MovDir[x][y] = direction[0][element - EL_BD_BUTTERFLY_RIGHT];
2531       break;
2532
2533     case EL_BD_FIREFLY_RIGHT:
2534     case EL_BD_FIREFLY_UP:
2535     case EL_BD_FIREFLY_LEFT:
2536     case EL_BD_FIREFLY_DOWN:
2537       Feld[x][y] = EL_BD_FIREFLY;
2538       MovDir[x][y] = direction[0][element - EL_BD_FIREFLY_RIGHT];
2539       break;
2540
2541     case EL_PACMAN_RIGHT:
2542     case EL_PACMAN_UP:
2543     case EL_PACMAN_LEFT:
2544     case EL_PACMAN_DOWN:
2545       Feld[x][y] = EL_PACMAN;
2546       MovDir[x][y] = direction[0][element - EL_PACMAN_RIGHT];
2547       break;
2548
2549     case EL_YAMYAM_LEFT:
2550     case EL_YAMYAM_RIGHT:
2551     case EL_YAMYAM_UP:
2552     case EL_YAMYAM_DOWN:
2553       Feld[x][y] = EL_YAMYAM;
2554       MovDir[x][y] = direction[2][element - EL_YAMYAM_LEFT];
2555       break;
2556
2557     case EL_SP_SNIKSNAK:
2558       MovDir[x][y] = MV_UP;
2559       break;
2560
2561     case EL_SP_ELECTRON:
2562       MovDir[x][y] = MV_LEFT;
2563       break;
2564
2565     case EL_MOLE_LEFT:
2566     case EL_MOLE_RIGHT:
2567     case EL_MOLE_UP:
2568     case EL_MOLE_DOWN:
2569       Feld[x][y] = EL_MOLE;
2570       MovDir[x][y] = direction[2][element - EL_MOLE_LEFT];
2571       break;
2572
2573     default:
2574       if (IS_CUSTOM_ELEMENT(element))
2575       {
2576         struct ElementInfo *ei = &element_info[element];
2577         int move_direction_initial = ei->move_direction_initial;
2578         int move_pattern = ei->move_pattern;
2579
2580         if (move_direction_initial == MV_START_PREVIOUS)
2581         {
2582           if (MovDir[x][y] != MV_NONE)
2583             return;
2584
2585           move_direction_initial = MV_START_AUTOMATIC;
2586         }
2587
2588         if (move_direction_initial == MV_START_RANDOM)
2589           MovDir[x][y] = 1 << RND(4);
2590         else if (move_direction_initial & MV_ANY_DIRECTION)
2591           MovDir[x][y] = move_direction_initial;
2592         else if (move_pattern == MV_ALL_DIRECTIONS ||
2593                  move_pattern == MV_TURNING_LEFT ||
2594                  move_pattern == MV_TURNING_RIGHT ||
2595                  move_pattern == MV_TURNING_LEFT_RIGHT ||
2596                  move_pattern == MV_TURNING_RIGHT_LEFT ||
2597                  move_pattern == MV_TURNING_RANDOM)
2598           MovDir[x][y] = 1 << RND(4);
2599         else if (move_pattern == MV_HORIZONTAL)
2600           MovDir[x][y] = (RND(2) ? MV_LEFT : MV_RIGHT);
2601         else if (move_pattern == MV_VERTICAL)
2602           MovDir[x][y] = (RND(2) ? MV_UP : MV_DOWN);
2603         else if (move_pattern & MV_ANY_DIRECTION)
2604           MovDir[x][y] = element_info[element].move_pattern;
2605         else if (move_pattern == MV_ALONG_LEFT_SIDE ||
2606                  move_pattern == MV_ALONG_RIGHT_SIDE)
2607         {
2608           /* use random direction as default start direction */
2609           if (game.engine_version >= VERSION_IDENT(3,1,0,0))
2610             MovDir[x][y] = 1 << RND(4);
2611
2612           for (i = 0; i < NUM_DIRECTIONS; i++)
2613           {
2614             int x1 = x + xy[i][0];
2615             int y1 = y + xy[i][1];
2616
2617             if (!IN_LEV_FIELD(x1, y1) || !IS_FREE(x1, y1))
2618             {
2619               if (move_pattern == MV_ALONG_RIGHT_SIDE)
2620                 MovDir[x][y] = direction[0][i];
2621               else
2622                 MovDir[x][y] = direction[1][i];
2623
2624               break;
2625             }
2626           }
2627         }
2628       }
2629       else
2630       {
2631         MovDir[x][y] = 1 << RND(4);
2632
2633         if (element != EL_BUG &&
2634             element != EL_SPACESHIP &&
2635             element != EL_BD_BUTTERFLY &&
2636             element != EL_BD_FIREFLY)
2637           break;
2638
2639         for (i = 0; i < NUM_DIRECTIONS; i++)
2640         {
2641           int x1 = x + xy[i][0];
2642           int y1 = y + xy[i][1];
2643
2644           if (!IN_LEV_FIELD(x1, y1) || !IS_FREE(x1, y1))
2645           {
2646             if (element == EL_BUG || element == EL_BD_BUTTERFLY)
2647             {
2648               MovDir[x][y] = direction[0][i];
2649               break;
2650             }
2651             else if (element == EL_SPACESHIP || element == EL_BD_FIREFLY ||
2652                      element == EL_SP_SNIKSNAK || element == EL_SP_ELECTRON)
2653             {
2654               MovDir[x][y] = direction[1][i];
2655               break;
2656             }
2657           }
2658         }
2659       }
2660       break;
2661   }
2662
2663   GfxDir[x][y] = MovDir[x][y];
2664 }
2665
2666 void InitAmoebaNr(int x, int y)
2667 {
2668   int i;
2669   int group_nr = AmoebeNachbarNr(x, y);
2670
2671   if (group_nr == 0)
2672   {
2673     for (i = 1; i < MAX_NUM_AMOEBA; i++)
2674     {
2675       if (AmoebaCnt[i] == 0)
2676       {
2677         group_nr = i;
2678         break;
2679       }
2680     }
2681   }
2682
2683   AmoebaNr[x][y] = group_nr;
2684   AmoebaCnt[group_nr]++;
2685   AmoebaCnt2[group_nr]++;
2686 }
2687
2688 void GameWon()
2689 {
2690   int hi_pos;
2691   boolean raise_level = FALSE;
2692
2693   if (local_player->MovPos)
2694     return;
2695
2696   if (tape.auto_play)           /* tape might already be stopped here */
2697     tape.auto_play_level_solved = TRUE;
2698
2699   local_player->LevelSolved = FALSE;
2700
2701   PlaySoundStereo(SND_GAME_WINNING, SOUND_MIDDLE);
2702
2703   if (TimeLeft)
2704   {
2705     if (!tape.playing && setup.sound_loops)
2706       PlaySoundExt(SND_GAME_LEVELTIME_BONUS, SOUND_MAX_VOLUME, SOUND_MIDDLE,
2707                    SND_CTRL_PLAY_LOOP);
2708
2709     while (TimeLeft > 0)
2710     {
2711       if (!tape.playing && !setup.sound_loops)
2712         PlaySoundStereo(SND_GAME_LEVELTIME_BONUS, SOUND_MIDDLE);
2713
2714       if (TimeLeft > 100 && TimeLeft % 10 == 0)
2715       {
2716         TimeLeft -= 10;
2717         RaiseScore(level.score[SC_TIME_BONUS] * 10);
2718       }
2719       else
2720       {
2721         TimeLeft--;
2722         RaiseScore(level.score[SC_TIME_BONUS]);
2723       }
2724
2725       DrawGameValue_Time(TimeLeft);
2726
2727       BackToFront();
2728
2729       if (!tape.playing)
2730         Delay(10);
2731     }
2732
2733     if (!tape.playing && setup.sound_loops)
2734       StopSound(SND_GAME_LEVELTIME_BONUS);
2735   }
2736   else if (level.time == 0)             /* level without time limit */
2737   {
2738     if (!tape.playing && setup.sound_loops)
2739       PlaySoundExt(SND_GAME_LEVELTIME_BONUS, SOUND_MAX_VOLUME, SOUND_MIDDLE,
2740                    SND_CTRL_PLAY_LOOP);
2741
2742     while (TimePlayed < 999)
2743     {
2744       if (!tape.playing && !setup.sound_loops)
2745         PlaySoundStereo(SND_GAME_LEVELTIME_BONUS, SOUND_MIDDLE);
2746
2747       if (TimePlayed < 900 && TimePlayed % 10 == 0)
2748       {
2749         TimePlayed += 10;
2750         RaiseScore(level.score[SC_TIME_BONUS] * 10);
2751       }
2752       else
2753       {
2754         TimePlayed++;
2755         RaiseScore(level.score[SC_TIME_BONUS]);
2756       }
2757
2758       DrawGameValue_Time(TimePlayed);
2759
2760       BackToFront();
2761
2762       if (!tape.playing)
2763         Delay(10);
2764     }
2765
2766     if (!tape.playing && setup.sound_loops)
2767       StopSound(SND_GAME_LEVELTIME_BONUS);
2768   }
2769
2770   /* close exit door after last player */
2771   if (AllPlayersGone && ExitX >= 0 && ExitY >= 0 &&
2772       (Feld[ExitX][ExitY] == EL_EXIT_OPEN ||
2773        Feld[ExitX][ExitY] == EL_SP_EXIT_OPEN))
2774   {
2775     int element = Feld[ExitX][ExitY];
2776
2777     Feld[ExitX][ExitY] = (element == EL_EXIT_OPEN ? EL_EXIT_CLOSING :
2778                           EL_SP_EXIT_CLOSING);
2779
2780     PlayLevelSoundElementAction(ExitX, ExitY, element, ACTION_CLOSING);
2781   }
2782
2783   /* player disappears */
2784   if (ExitX >= 0 && ExitY >= 0)
2785     DrawLevelField(ExitX, ExitY);
2786
2787   BackToFront();
2788
2789 #if 0
2790   if (tape.playing)
2791     printf("::: TAPE PLAYING -> DO NOT SAVE SCORE\n");
2792   else
2793     printf("::: NO TAPE PLAYING -> SAVING SCORE\n");
2794 #endif
2795
2796   if (tape.playing)
2797     return;
2798
2799   CloseDoor(DOOR_CLOSE_1);
2800
2801   if (tape.recording)
2802   {
2803     TapeStop();
2804     SaveTape(tape.level_nr);            /* Ask to save tape */
2805   }
2806
2807   if (level_nr == leveldir_current->handicap_level)
2808   {
2809     leveldir_current->handicap_level++;
2810     SaveLevelSetup_SeriesInfo();
2811   }
2812
2813   if (level_editor_test_game)
2814     local_player->score = -1;   /* no highscore when playing from editor */
2815   else if (level_nr < leveldir_current->last_level)
2816     raise_level = TRUE;         /* advance to next level */
2817
2818   if ((hi_pos = NewHiScore()) >= 0)
2819   {
2820     game_status = GAME_MODE_SCORES;
2821     DrawHallOfFame(hi_pos);
2822     if (raise_level)
2823     {
2824       level_nr++;
2825       TapeErase();
2826     }
2827   }
2828   else
2829   {
2830     game_status = GAME_MODE_MAIN;
2831     if (raise_level)
2832     {
2833       level_nr++;
2834       TapeErase();
2835     }
2836     DrawMainMenu();
2837   }
2838
2839   BackToFront();
2840 }
2841
2842 int NewHiScore()
2843 {
2844   int k, l;
2845   int position = -1;
2846
2847   LoadScore(level_nr);
2848
2849   if (strcmp(setup.player_name, EMPTY_PLAYER_NAME) == 0 ||
2850       local_player->score < highscore[MAX_SCORE_ENTRIES - 1].Score)
2851     return -1;
2852
2853   for (k = 0; k < MAX_SCORE_ENTRIES; k++)
2854   {
2855     if (local_player->score > highscore[k].Score)
2856     {
2857       /* player has made it to the hall of fame */
2858
2859       if (k < MAX_SCORE_ENTRIES - 1)
2860       {
2861         int m = MAX_SCORE_ENTRIES - 1;
2862
2863 #ifdef ONE_PER_NAME
2864         for (l = k; l < MAX_SCORE_ENTRIES; l++)
2865           if (!strcmp(setup.player_name, highscore[l].Name))
2866             m = l;
2867         if (m == k)     /* player's new highscore overwrites his old one */
2868           goto put_into_list;
2869 #endif
2870
2871         for (l = m; l > k; l--)
2872         {
2873           strcpy(highscore[l].Name, highscore[l - 1].Name);
2874           highscore[l].Score = highscore[l - 1].Score;
2875         }
2876       }
2877
2878 #ifdef ONE_PER_NAME
2879       put_into_list:
2880 #endif
2881       strncpy(highscore[k].Name, setup.player_name, MAX_PLAYER_NAME_LEN);
2882       highscore[k].Name[MAX_PLAYER_NAME_LEN] = '\0';
2883       highscore[k].Score = local_player->score;
2884       position = k;
2885       break;
2886     }
2887
2888 #ifdef ONE_PER_NAME
2889     else if (!strncmp(setup.player_name, highscore[k].Name,
2890                       MAX_PLAYER_NAME_LEN))
2891       break;    /* player already there with a higher score */
2892 #endif
2893
2894   }
2895
2896   if (position >= 0)
2897     SaveScore(level_nr);
2898
2899   return position;
2900 }
2901
2902 inline static int getElementMoveStepsize(int x, int y)
2903 {
2904   int element = Feld[x][y];
2905   int direction = MovDir[x][y];
2906   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
2907   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
2908   int horiz_move = (dx != 0);
2909   int sign = (horiz_move ? dx : dy);
2910   int step = sign * element_info[element].move_stepsize;
2911
2912   /* special values for move stepsize for spring and things on conveyor belt */
2913   if (horiz_move)
2914   {
2915 #if 0
2916     if (element == EL_SPRING)
2917       step = sign * MOVE_STEPSIZE_NORMAL * 2;
2918     else if (CAN_FALL(element) && !CAN_MOVE(element) &&
2919              y < lev_fieldy - 1 && IS_BELT_ACTIVE(Feld[x][y + 1]))
2920       step = sign * MOVE_STEPSIZE_NORMAL / 2;
2921 #else
2922     if (CAN_FALL(element) &&
2923         y < lev_fieldy - 1 && IS_BELT_ACTIVE(Feld[x][y + 1]))
2924       step = sign * MOVE_STEPSIZE_NORMAL / 2;
2925     else if (element == EL_SPRING)
2926       step = sign * MOVE_STEPSIZE_NORMAL * 2;
2927 #endif
2928   }
2929
2930   return step;
2931 }
2932
2933 void InitPlayerGfxAnimation(struct PlayerInfo *player, int action, int dir)
2934 {
2935   if (player->GfxAction != action || player->GfxDir != dir)
2936   {
2937 #if 0
2938     printf("Player frame reset! (%d => %d, %d => %d)\n",
2939            player->GfxAction, action, player->GfxDir, dir);
2940 #endif
2941
2942     player->GfxAction = action;
2943     player->GfxDir = dir;
2944     player->Frame = 0;
2945     player->StepFrame = 0;
2946   }
2947 }
2948
2949 static void ResetRandomAnimationValue(int x, int y)
2950 {
2951   GfxRandom[x][y] = INIT_GFX_RANDOM();
2952 }
2953
2954 static void ResetGfxAnimation(int x, int y)
2955 {
2956 #if 0
2957   int element, graphic;
2958 #endif
2959
2960   GfxFrame[x][y] = 0;
2961   GfxAction[x][y] = ACTION_DEFAULT;
2962   GfxDir[x][y] = MovDir[x][y];
2963
2964 #if 0
2965   element = Feld[x][y];
2966   graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
2967
2968   if (graphic_info[graphic].anim_global_sync)
2969     GfxFrame[x][y] = FrameCounter;
2970   else if (ANIM_MODE(graphic) == ANIM_CE_VALUE)
2971     GfxFrame[x][y] = CustomValue[x][y];
2972   else if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
2973     GfxFrame[x][y] = element_info[element].collect_score;
2974 #endif
2975 }
2976
2977 void InitMovingField(int x, int y, int direction)
2978 {
2979   int element = Feld[x][y];
2980 #if 0
2981   int graphic;
2982 #endif
2983   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
2984   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
2985   int newx = x + dx;
2986   int newy = y + dy;
2987
2988   if (!WasJustMoving[x][y] || direction != MovDir[x][y])
2989     ResetGfxAnimation(x, y);
2990
2991   MovDir[x][y] = direction;
2992   GfxDir[x][y] = direction;
2993   GfxAction[x][y] = (direction == MV_DOWN && CAN_FALL(element) ?
2994                      ACTION_FALLING : ACTION_MOVING);
2995
2996 #if 0
2997   graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
2998
2999   if (graphic_info[graphic].anim_global_sync)
3000     GfxFrame[x][y] = FrameCounter;
3001   else if (ANIM_MODE(graphic) == ANIM_CE_VALUE)
3002     GfxFrame[x][y] = CustomValue[x][y];
3003   else if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
3004     GfxFrame[x][y] = element_info[element].collect_score;
3005 #endif
3006
3007   /* this is needed for CEs with property "can move" / "not moving" */
3008
3009   if (getElementMoveStepsize(x, y) != 0)        /* moving or being moved */
3010   {
3011     if (Feld[newx][newy] == EL_EMPTY)
3012       Feld[newx][newy] = EL_BLOCKED;
3013
3014     MovDir[newx][newy] = MovDir[x][y];
3015
3016 #if USE_NEW_CUSTOM_VALUE
3017     CustomValue[newx][newy] = CustomValue[x][y];
3018 #endif
3019
3020     GfxFrame[newx][newy] = GfxFrame[x][y];
3021     GfxRandom[newx][newy] = GfxRandom[x][y];
3022     GfxAction[newx][newy] = GfxAction[x][y];
3023     GfxDir[newx][newy] = GfxDir[x][y];
3024   }
3025 }
3026
3027 void Moving2Blocked(int x, int y, int *goes_to_x, int *goes_to_y)
3028 {
3029   int direction = MovDir[x][y];
3030 #if 1
3031   int newx = x + (direction & MV_LEFT ? -1 : direction & MV_RIGHT ? +1 : 0);
3032   int newy = y + (direction & MV_UP   ? -1 : direction & MV_DOWN  ? +1 : 0);
3033 #else
3034   int newx = x + (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
3035   int newy = y + (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
3036 #endif
3037
3038   *goes_to_x = newx;
3039   *goes_to_y = newy;
3040 }
3041
3042 void Blocked2Moving(int x, int y, int *comes_from_x, int *comes_from_y)
3043 {
3044   int oldx = x, oldy = y;
3045   int direction = MovDir[x][y];
3046
3047   if (direction == MV_LEFT)
3048     oldx++;
3049   else if (direction == MV_RIGHT)
3050     oldx--;
3051   else if (direction == MV_UP)
3052     oldy++;
3053   else if (direction == MV_DOWN)
3054     oldy--;
3055
3056   *comes_from_x = oldx;
3057   *comes_from_y = oldy;
3058 }
3059
3060 int MovingOrBlocked2Element(int x, int y)
3061 {
3062   int element = Feld[x][y];
3063
3064   if (element == EL_BLOCKED)
3065   {
3066     int oldx, oldy;
3067
3068     Blocked2Moving(x, y, &oldx, &oldy);
3069     return Feld[oldx][oldy];
3070   }
3071   else
3072     return element;
3073 }
3074
3075 static int MovingOrBlocked2ElementIfNotLeaving(int x, int y)
3076 {
3077   /* like MovingOrBlocked2Element(), but if element is moving
3078      and (x,y) is the field the moving element is just leaving,
3079      return EL_BLOCKED instead of the element value */
3080   int element = Feld[x][y];
3081
3082   if (IS_MOVING(x, y))
3083   {
3084     if (element == EL_BLOCKED)
3085     {
3086       int oldx, oldy;
3087
3088       Blocked2Moving(x, y, &oldx, &oldy);
3089       return Feld[oldx][oldy];
3090     }
3091     else
3092       return EL_BLOCKED;
3093   }
3094   else
3095     return element;
3096 }
3097
3098 static void RemoveField(int x, int y)
3099 {
3100   Feld[x][y] = EL_EMPTY;
3101
3102   MovPos[x][y] = 0;
3103   MovDir[x][y] = 0;
3104   MovDelay[x][y] = 0;
3105
3106 #if USE_NEW_CUSTOM_VALUE
3107   CustomValue[x][y] = 0;
3108 #endif
3109
3110   AmoebaNr[x][y] = 0;
3111   ChangeDelay[x][y] = 0;
3112   ChangePage[x][y] = -1;
3113   Pushed[x][y] = FALSE;
3114
3115 #if 0
3116   ExplodeField[x][y] = EX_TYPE_NONE;
3117 #endif
3118
3119   GfxElement[x][y] = EL_UNDEFINED;
3120   GfxAction[x][y] = ACTION_DEFAULT;
3121   GfxDir[x][y] = MV_NONE;
3122 }
3123
3124 void RemoveMovingField(int x, int y)
3125 {
3126   int oldx = x, oldy = y, newx = x, newy = y;
3127   int element = Feld[x][y];
3128   int next_element = EL_UNDEFINED;
3129
3130   if (element != EL_BLOCKED && !IS_MOVING(x, y))
3131     return;
3132
3133   if (IS_MOVING(x, y))
3134   {
3135     Moving2Blocked(x, y, &newx, &newy);
3136
3137     if (Feld[newx][newy] != EL_BLOCKED)
3138     {
3139       /* element is moving, but target field is not free (blocked), but
3140          already occupied by something different (example: acid pool);
3141          in this case, only remove the moving field, but not the target */
3142
3143       RemoveField(oldx, oldy);
3144
3145       Store[oldx][oldy] = Store2[oldx][oldy] = 0;
3146
3147       DrawLevelField(oldx, oldy);
3148
3149       return;
3150     }
3151   }
3152   else if (element == EL_BLOCKED)
3153   {
3154     Blocked2Moving(x, y, &oldx, &oldy);
3155     if (!IS_MOVING(oldx, oldy))
3156       return;
3157   }
3158
3159   if (element == EL_BLOCKED &&
3160       (Feld[oldx][oldy] == EL_QUICKSAND_EMPTYING ||
3161        Feld[oldx][oldy] == EL_MAGIC_WALL_EMPTYING ||
3162        Feld[oldx][oldy] == EL_BD_MAGIC_WALL_EMPTYING ||
3163        Feld[oldx][oldy] == EL_AMOEBA_DROPPING))
3164     next_element = get_next_element(Feld[oldx][oldy]);
3165
3166   RemoveField(oldx, oldy);
3167   RemoveField(newx, newy);
3168
3169   Store[oldx][oldy] = Store2[oldx][oldy] = 0;
3170
3171   if (next_element != EL_UNDEFINED)
3172     Feld[oldx][oldy] = next_element;
3173
3174   DrawLevelField(oldx, oldy);
3175   DrawLevelField(newx, newy);
3176 }
3177
3178 void DrawDynamite(int x, int y)
3179 {
3180   int sx = SCREENX(x), sy = SCREENY(y);
3181   int graphic = el2img(Feld[x][y]);
3182   int frame;
3183
3184   if (!IN_SCR_FIELD(sx, sy) || IS_PLAYER(x, y))
3185     return;
3186
3187   if (IS_WALKABLE_INSIDE(Back[x][y]))
3188     return;
3189
3190   if (Back[x][y])
3191     DrawGraphic(sx, sy, el2img(Back[x][y]), 0);
3192   else if (Store[x][y])
3193     DrawGraphic(sx, sy, el2img(Store[x][y]), 0);
3194
3195   frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
3196
3197   if (Back[x][y] || Store[x][y])
3198     DrawGraphicThruMask(sx, sy, graphic, frame);
3199   else
3200     DrawGraphic(sx, sy, graphic, frame);
3201 }
3202
3203 void CheckDynamite(int x, int y)
3204 {
3205   if (MovDelay[x][y] != 0)      /* dynamite is still waiting to explode */
3206   {
3207     MovDelay[x][y]--;
3208
3209     if (MovDelay[x][y] != 0)
3210     {
3211       DrawDynamite(x, y);
3212       PlayLevelSoundActionIfLoop(x, y, ACTION_ACTIVE);
3213
3214       return;
3215     }
3216   }
3217
3218   StopLevelSoundActionIfLoop(x, y, ACTION_ACTIVE);
3219
3220   Bang(x, y);
3221 }
3222
3223 #if 1
3224
3225 static void setMinimalPlayerBoundaries(int *sx1, int *sy1, int *sx2, int *sy2)
3226 {
3227   boolean num_checked_players = 0;
3228   int i;
3229
3230   for (i = 0; i < MAX_PLAYERS; i++)
3231   {
3232     if (stored_player[i].active)
3233     {
3234       int sx = stored_player[i].jx;
3235       int sy = stored_player[i].jy;
3236
3237       if (num_checked_players == 0)
3238       {
3239         *sx1 = *sx2 = sx;
3240         *sy1 = *sy2 = sy;
3241       }
3242       else
3243       {
3244         *sx1 = MIN(*sx1, sx);
3245         *sy1 = MIN(*sy1, sy);
3246         *sx2 = MAX(*sx2, sx);
3247         *sy2 = MAX(*sy2, sy);
3248       }
3249
3250       num_checked_players++;
3251     }
3252   }
3253 }
3254
3255 static boolean checkIfAllPlayersFitToScreen_RND()
3256 {
3257   int sx1 = 0, sy1 = 0, sx2 = 0, sy2 = 0;
3258
3259   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
3260
3261   return (sx2 - sx1 < SCR_FIELDX &&
3262           sy2 - sy1 < SCR_FIELDY);
3263 }
3264
3265 static void setScreenCenteredToAllPlayers(int *sx, int *sy)
3266 {
3267   int sx1 = scroll_x, sy1 = scroll_y, sx2 = scroll_x, sy2 = scroll_y;
3268
3269   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
3270
3271   *sx = (sx1 + sx2) / 2;
3272   *sy = (sy1 + sy2) / 2;
3273 }
3274
3275 #if 0
3276 static void setMaxCenterDistanceForAllPlayers(int *max_dx, int *max_dy,
3277                                               int center_x, int center_y)
3278 {
3279   int sx1 = center_x, sy1 = center_y, sx2 = center_x, sy2 = center_y;
3280
3281   setMinimalPlayerBoundaries(&sx1, &sy1, &sx2, &sy2);
3282
3283   *max_dx = MAX(ABS(sx1 - center_x), ABS(sx2 - center_x));
3284   *max_dy = MAX(ABS(sy1 - center_y), ABS(sy2 - center_y));
3285 }
3286
3287 static boolean checkIfAllPlayersAreVisible(int center_x, int center_y)
3288 {
3289   int max_dx, max_dy;
3290
3291   setMaxCenterDistanceForAllPlayers(&max_dx, &max_dy, center_x, center_y);
3292
3293   return (max_dx <= SCR_FIELDX / 2 &&
3294           max_dy <= SCR_FIELDY / 2);
3295 }
3296 #endif
3297
3298 #endif
3299
3300 #if 1
3301
3302 void DrawRelocateScreen(int x, int y, int move_dir, boolean center_screen,
3303                         boolean quick_relocation)
3304 {
3305   boolean ffwd_delay = (tape.playing && tape.fast_forward);
3306   boolean no_delay = (tape.warp_forward);
3307   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
3308   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
3309
3310   if (quick_relocation)
3311   {
3312     int offset = (setup.scroll_delay ? 3 : 0);
3313
3314 #if 0
3315     if (center_screen)
3316       offset = 0;
3317 #endif
3318
3319     if (!IN_VIS_FIELD(SCREENX(x), SCREENY(y)) || center_screen)
3320     {
3321       scroll_x = (x < SBX_Left  + MIDPOSX ? SBX_Left :
3322                   x > SBX_Right + MIDPOSX ? SBX_Right :
3323                   x - MIDPOSX);
3324
3325       scroll_y = (y < SBY_Upper + MIDPOSY ? SBY_Upper :
3326                   y > SBY_Lower + MIDPOSY ? SBY_Lower :
3327                   y - MIDPOSY);
3328     }
3329     else
3330     {
3331       if ((move_dir == MV_LEFT  && scroll_x > x - MIDPOSX + offset) ||
3332           (move_dir == MV_RIGHT && scroll_x < x - MIDPOSX - offset))
3333         scroll_x = x - MIDPOSX + (scroll_x < x - MIDPOSX ? -offset : +offset);
3334
3335       if ((move_dir == MV_UP   && scroll_y > y - MIDPOSY + offset) ||
3336           (move_dir == MV_DOWN && scroll_y < y - MIDPOSY - offset))
3337         scroll_y = y - MIDPOSY + (scroll_y < y - MIDPOSY ? -offset : +offset);
3338
3339       /* don't scroll over playfield boundaries */
3340       if (scroll_x < SBX_Left || scroll_x > SBX_Right)
3341         scroll_x = (scroll_x < SBX_Left ? SBX_Left : SBX_Right);
3342
3343       /* don't scroll over playfield boundaries */
3344       if (scroll_y < SBY_Upper || scroll_y > SBY_Lower)
3345         scroll_y = (scroll_y < SBY_Upper ? SBY_Upper : SBY_Lower);
3346     }
3347
3348     RedrawPlayfield(TRUE, 0,0,0,0);
3349   }
3350   else
3351   {
3352     int scroll_xx = (x < SBX_Left  + MIDPOSX ? SBX_Left :
3353                      x > SBX_Right + MIDPOSX ? SBX_Right :
3354                      x - MIDPOSX);
3355
3356     int scroll_yy = (y < SBY_Upper + MIDPOSY ? SBY_Upper :
3357                      y > SBY_Lower + MIDPOSY ? SBY_Lower :
3358                      y - MIDPOSY);
3359
3360     ScrollScreen(NULL, SCROLL_GO_ON);   /* scroll last frame to full tile */
3361
3362     while (scroll_x != scroll_xx || scroll_y != scroll_yy)
3363     {
3364       int dx = 0, dy = 0;
3365       int fx = FX, fy = FY;
3366
3367       dx = (scroll_xx < scroll_x ? +1 : scroll_xx > scroll_x ? -1 : 0);
3368       dy = (scroll_yy < scroll_y ? +1 : scroll_yy > scroll_y ? -1 : 0);
3369
3370       if (dx == 0 && dy == 0)           /* no scrolling needed at all */
3371         break;
3372
3373       scroll_x -= dx;
3374       scroll_y -= dy;
3375
3376       fx += dx * TILEX / 2;
3377       fy += dy * TILEY / 2;
3378
3379       ScrollLevel(dx, dy);
3380       DrawAllPlayers();
3381
3382       /* scroll in two steps of half tile size to make things smoother */
3383       BlitBitmap(drawto_field, window, fx, fy, SXSIZE, SYSIZE, SX, SY);
3384       FlushDisplay();
3385       Delay(wait_delay_value);
3386
3387       /* scroll second step to align at full tile size */
3388       BackToFront();
3389       Delay(wait_delay_value);
3390     }
3391
3392     DrawAllPlayers();
3393     BackToFront();
3394     Delay(wait_delay_value);
3395   }
3396 }
3397
3398 #else
3399
3400 void DrawRelocatePlayer(struct PlayerInfo *player, boolean quick_relocation)
3401 {
3402   boolean ffwd_delay = (tape.playing && tape.fast_forward);
3403   boolean no_delay = (tape.warp_forward);
3404   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
3405   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
3406   int jx = player->jx;
3407   int jy = player->jy;
3408
3409   if (quick_relocation)
3410   {
3411     int offset = (setup.scroll_delay ? 3 : 0);
3412
3413     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
3414     {
3415       scroll_x = (player->jx < SBX_Left  + MIDPOSX ? SBX_Left :
3416                   player->jx > SBX_Right + MIDPOSX ? SBX_Right :
3417                   player->jx - MIDPOSX);
3418
3419       scroll_y = (player->jy < SBY_Upper + MIDPOSY ? SBY_Upper :
3420                   player->jy > SBY_Lower + MIDPOSY ? SBY_Lower :
3421                   player->jy - MIDPOSY);
3422     }
3423     else
3424     {
3425       if ((player->MovDir == MV_LEFT  && scroll_x > jx - MIDPOSX + offset) ||
3426           (player->MovDir == MV_RIGHT && scroll_x < jx - MIDPOSX - offset))
3427         scroll_x = jx - MIDPOSX + (scroll_x < jx-MIDPOSX ? -offset : +offset);
3428
3429       if ((player->MovDir == MV_UP  && scroll_y > jy - MIDPOSY + offset) ||
3430           (player->MovDir == MV_DOWN && scroll_y < jy - MIDPOSY - offset))
3431         scroll_y = jy - MIDPOSY + (scroll_y < jy-MIDPOSY ? -offset : +offset);
3432
3433       /* don't scroll over playfield boundaries */
3434       if (scroll_x < SBX_Left || scroll_x > SBX_Right)
3435         scroll_x = (scroll_x < SBX_Left ? SBX_Left : SBX_Right);
3436
3437       /* don't scroll over playfield boundaries */
3438       if (scroll_y < SBY_Upper || scroll_y > SBY_Lower)
3439         scroll_y = (scroll_y < SBY_Upper ? SBY_Upper : SBY_Lower);
3440     }
3441
3442     RedrawPlayfield(TRUE, 0,0,0,0);
3443   }
3444   else
3445   {
3446     int scroll_xx = (player->jx < SBX_Left  + MIDPOSX ? SBX_Left :
3447                      player->jx > SBX_Right + MIDPOSX ? SBX_Right :
3448                      player->jx - MIDPOSX);
3449
3450     int scroll_yy = (player->jy < SBY_Upper + MIDPOSY ? SBY_Upper :
3451                      player->jy > SBY_Lower + MIDPOSY ? SBY_Lower :
3452                      player->jy - MIDPOSY);
3453
3454     ScrollScreen(NULL, SCROLL_GO_ON);   /* scroll last frame to full tile */
3455
3456     while (scroll_x != scroll_xx || scroll_y != scroll_yy)
3457     {
3458       int dx = 0, dy = 0;
3459       int fx = FX, fy = FY;
3460
3461       dx = (scroll_xx < scroll_x ? +1 : scroll_xx > scroll_x ? -1 : 0);
3462       dy = (scroll_yy < scroll_y ? +1 : scroll_yy > scroll_y ? -1 : 0);
3463
3464       if (dx == 0 && dy == 0)           /* no scrolling needed at all */
3465         break;
3466
3467       scroll_x -= dx;
3468       scroll_y -= dy;
3469
3470       fx += dx * TILEX / 2;
3471       fy += dy * TILEY / 2;
3472
3473       ScrollLevel(dx, dy);
3474       DrawAllPlayers();
3475
3476       /* scroll in two steps of half tile size to make things smoother */
3477       BlitBitmap(drawto_field, window, fx, fy, SXSIZE, SYSIZE, SX, SY);
3478       FlushDisplay();
3479       Delay(wait_delay_value);
3480
3481       /* scroll second step to align at full tile size */
3482       BackToFront();
3483       Delay(wait_delay_value);
3484     }
3485
3486     DrawPlayer(player);
3487     BackToFront();
3488     Delay(wait_delay_value);
3489   }
3490 }
3491
3492 #endif
3493
3494 void RelocatePlayer(int jx, int jy, int el_player_raw)
3495 {
3496   int el_player = GET_PLAYER_ELEMENT(el_player_raw);
3497   int player_nr = GET_PLAYER_NR(el_player);
3498   struct PlayerInfo *player = &stored_player[player_nr];
3499   boolean ffwd_delay = (tape.playing && tape.fast_forward);
3500   boolean no_delay = (tape.warp_forward);
3501   int frame_delay_value = (ffwd_delay ? FfwdFrameDelay : GameFrameDelay);
3502   int wait_delay_value = (no_delay ? 0 : frame_delay_value);
3503   int old_jx = player->jx;
3504   int old_jy = player->jy;
3505   int old_element = Feld[old_jx][old_jy];
3506   int element = Feld[jx][jy];
3507   boolean player_relocated = (old_jx != jx || old_jy != jy);
3508
3509   int move_dir_horiz = (jx < old_jx ? MV_LEFT : jx > old_jx ? MV_RIGHT : 0);
3510   int move_dir_vert  = (jy < old_jy ? MV_UP   : jy > old_jy ? MV_DOWN  : 0);
3511   int enter_side_horiz = MV_DIR_OPPOSITE(move_dir_horiz);
3512   int enter_side_vert  = MV_DIR_OPPOSITE(move_dir_vert);
3513   int leave_side_horiz = move_dir_horiz;
3514   int leave_side_vert  = move_dir_vert;
3515   int enter_side = enter_side_horiz | enter_side_vert;
3516   int leave_side = leave_side_horiz | leave_side_vert;
3517
3518   if (player->GameOver)         /* do not reanimate dead player */
3519     return;
3520
3521   if (!player_relocated)        /* no need to relocate the player */
3522     return;
3523
3524   if (IS_PLAYER(jx, jy))        /* player already placed at new position */
3525   {
3526     RemoveField(jx, jy);        /* temporarily remove newly placed player */
3527     DrawLevelField(jx, jy);
3528   }
3529
3530   if (player->present)
3531   {
3532     while (player->MovPos)
3533     {
3534       ScrollPlayer(player, SCROLL_GO_ON);
3535       ScrollScreen(NULL, SCROLL_GO_ON);
3536
3537       AdvanceFrameAndPlayerCounters(player->index_nr);
3538
3539       DrawPlayer(player);
3540
3541       BackToFront();
3542       Delay(wait_delay_value);
3543     }
3544
3545     DrawPlayer(player);         /* needed here only to cleanup last field */
3546     DrawLevelField(player->jx, player->jy);     /* remove player graphic */
3547
3548     player->is_moving = FALSE;
3549   }
3550
3551   if (IS_CUSTOM_ELEMENT(old_element))
3552     CheckElementChangeByPlayer(old_jx, old_jy, old_element,
3553                                CE_LEFT_BY_PLAYER,
3554                                player->index_bit, leave_side);
3555
3556   CheckTriggeredElementChangeByPlayer(old_jx, old_jy, old_element,
3557                                       CE_PLAYER_LEAVES_X,
3558                                       player->index_bit, leave_side);
3559
3560   Feld[jx][jy] = el_player;
3561   InitPlayerField(jx, jy, el_player, TRUE);
3562
3563   if (!ELEM_IS_PLAYER(element)) /* player may be set on walkable element */
3564   {
3565     Feld[jx][jy] = element;
3566     InitField(jx, jy, FALSE);
3567   }
3568
3569 #if 1
3570   /* only visually relocate centered player */
3571 #if 1
3572   DrawRelocateScreen(player->jx, player->jy, player->MovDir, FALSE,
3573                      level.instant_relocation);
3574 #else
3575   if (player->index_nr == game.centered_player_nr)
3576     DrawRelocatePlayer(player, level.instant_relocation);
3577 #endif
3578 #else
3579   if (player == local_player)   /* only visually relocate local player */
3580     DrawRelocatePlayer(player, level.instant_relocation);
3581 #endif
3582
3583   TestIfPlayerTouchesBadThing(jx, jy);
3584   TestIfPlayerTouchesCustomElement(jx, jy);
3585
3586   if (IS_CUSTOM_ELEMENT(element))
3587     CheckElementChangeByPlayer(jx, jy, element, CE_ENTERED_BY_PLAYER,
3588                                player->index_bit, enter_side);
3589
3590   CheckTriggeredElementChangeByPlayer(jx, jy, element, CE_PLAYER_ENTERS_X,
3591                                       player->index_bit, enter_side);
3592 }
3593
3594 void Explode(int ex, int ey, int phase, int mode)
3595 {
3596   int x, y;
3597   int last_phase;
3598   int border_element;
3599
3600   /* !!! eliminate this variable !!! */
3601   int delay = (game.emulation == EMU_SUPAPLEX ? 3 : 2);
3602
3603   if (game.explosions_delayed)
3604   {
3605     ExplodeField[ex][ey] = mode;
3606     return;
3607   }
3608
3609   if (phase == EX_PHASE_START)          /* initialize 'Store[][]' field */
3610   {
3611     int center_element = Feld[ex][ey];
3612     int artwork_element, explosion_element;     /* set these values later */
3613
3614 #if 0
3615     /* --- This is only really needed (and now handled) in "Impact()". --- */
3616     /* do not explode moving elements that left the explode field in time */
3617     if (game.engine_version >= VERSION_IDENT(2,2,0,7) &&
3618         center_element == EL_EMPTY &&
3619         (mode == EX_TYPE_NORMAL || mode == EX_TYPE_CENTER))
3620       return;
3621 #endif
3622
3623 #if 0
3624     /* !!! at this place, the center element may be EL_BLOCKED !!! */
3625     if (mode == EX_TYPE_NORMAL ||
3626         mode == EX_TYPE_CENTER ||
3627         mode == EX_TYPE_CROSS)
3628       PlayLevelSoundElementAction(ex, ey, artwork_element, ACTION_EXPLODING);
3629 #endif
3630
3631     /* remove things displayed in background while burning dynamite */
3632     if (Back[ex][ey] != EL_EMPTY && !IS_INDESTRUCTIBLE(Back[ex][ey]))
3633       Back[ex][ey] = 0;
3634
3635     if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
3636     {
3637       /* put moving element to center field (and let it explode there) */
3638       center_element = MovingOrBlocked2Element(ex, ey);
3639       RemoveMovingField(ex, ey);
3640       Feld[ex][ey] = center_element;
3641     }
3642
3643     /* now "center_element" is finally determined -- set related values now */
3644     artwork_element = center_element;           /* for custom player artwork */
3645     explosion_element = center_element;         /* for custom player artwork */
3646
3647     if (IS_PLAYER(ex, ey))
3648     {
3649       int player_nr = GET_PLAYER_NR(StorePlayer[ex][ey]);
3650
3651       artwork_element = stored_player[player_nr].artwork_element;
3652
3653       if (level.use_explosion_element[player_nr])
3654       {
3655         explosion_element = level.explosion_element[player_nr];
3656         artwork_element = explosion_element;
3657       }
3658     }
3659
3660 #if 1
3661     if (mode == EX_TYPE_NORMAL ||
3662         mode == EX_TYPE_CENTER ||
3663         mode == EX_TYPE_CROSS)
3664       PlayLevelSoundElementAction(ex, ey, artwork_element, ACTION_EXPLODING);
3665 #endif
3666
3667 #if 1
3668     last_phase = element_info[explosion_element].explosion_delay + 1;
3669 #else
3670     last_phase = element_info[center_element].explosion_delay + 1;
3671 #endif
3672
3673     for (y = ey - 1; y <= ey + 1; y++) for (x = ex - 1; x <= ex + 1; x++)
3674     {
3675       int xx = x - ex + 1;
3676       int yy = y - ey + 1;
3677       int element;
3678
3679       if (!IN_LEV_FIELD(x, y) ||
3680           (mode & EX_TYPE_SINGLE_TILE && (x != ex || y != ey)) ||
3681           (mode == EX_TYPE_CROSS      && (x != ex && y != ey)))
3682         continue;
3683
3684       element = Feld[x][y];
3685
3686       if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
3687       {
3688         element = MovingOrBlocked2Element(x, y);
3689
3690         if (!IS_EXPLOSION_PROOF(element))
3691           RemoveMovingField(x, y);
3692       }
3693
3694       /* indestructible elements can only explode in center (but not flames) */
3695       if ((IS_EXPLOSION_PROOF(element) && (x != ex || y != ey ||
3696                                            mode == EX_TYPE_BORDER)) ||
3697           element == EL_FLAMES)
3698         continue;
3699
3700       /* no idea why this was changed from 3.0.8 to 3.1.0 -- this causes buggy
3701          behaviour, for example when touching a yamyam that explodes to rocks
3702          with active deadly shield, a rock is created under the player !!! */
3703       /* (case 1 (surely buggy): >= 3.1.0, case 2 (maybe buggy): <= 3.0.8) */
3704 #if 0
3705       if (IS_PLAYER(x, y) && SHIELD_ON(PLAYERINFO(x, y)) &&
3706           (game.engine_version < VERSION_IDENT(3,1,0,0) ||
3707            (x == ex && y == ey && mode != EX_TYPE_BORDER)))
3708 #else
3709       if (IS_PLAYER(x, y) && SHIELD_ON(PLAYERINFO(x, y)))
3710 #endif
3711       {
3712         if (IS_ACTIVE_BOMB(element))
3713         {
3714           /* re-activate things under the bomb like gate or penguin */
3715           Feld[x][y] = (Back[x][y] ? Back[x][y] : EL_EMPTY);
3716           Back[x][y] = 0;
3717         }
3718
3719         continue;
3720       }
3721
3722       /* save walkable background elements while explosion on same tile */
3723       if (IS_WALKABLE(element) && IS_INDESTRUCTIBLE(element) &&
3724           (x != ex || y != ey || mode == EX_TYPE_BORDER))
3725         Back[x][y] = element;
3726
3727       /* ignite explodable elements reached by other explosion */
3728       if (element == EL_EXPLOSION)
3729         element = Store2[x][y];
3730
3731       if (AmoebaNr[x][y] &&
3732           (element == EL_AMOEBA_FULL ||
3733            element == EL_BD_AMOEBA ||
3734            element == EL_AMOEBA_GROWING))
3735       {
3736         AmoebaCnt[AmoebaNr[x][y]]--;
3737         AmoebaCnt2[AmoebaNr[x][y]]--;
3738       }
3739
3740       RemoveField(x, y);
3741
3742       if (IS_PLAYER(ex, ey) && !PLAYER_EXPLOSION_PROTECTED(ex, ey))
3743       {
3744 #if 1
3745         int player_nr = StorePlayer[ex][ey] - EL_PLAYER_1;
3746
3747         Store[x][y] = EL_PLAYER_IS_EXPLODING_1 + player_nr;
3748 #else
3749         switch(StorePlayer[ex][ey])
3750         {
3751           case EL_PLAYER_2:
3752             Store[x][y] = EL_PLAYER_IS_EXPLODING_2;
3753             break;
3754           case EL_PLAYER_3:
3755             Store[x][y] = EL_PLAYER_IS_EXPLODING_3;
3756             break;
3757           case EL_PLAYER_4:
3758             Store[x][y] = EL_PLAYER_IS_EXPLODING_4;
3759             break;
3760           case EL_PLAYER_1:
3761           default:
3762             Store[x][y] = EL_PLAYER_IS_EXPLODING_1;
3763             break;
3764         }
3765 #endif
3766
3767         if (PLAYERINFO(ex, ey)->use_murphy)
3768           Store[x][y] = EL_EMPTY;
3769       }
3770 #if 1
3771       /* !!! check this case -- currently needed for rnd_rado_negundo_v,
3772          !!! levels 015 018 019 020 021 022 023 026 027 028 !!! */
3773       else if (ELEM_IS_PLAYER(center_element))
3774         Store[x][y] = EL_EMPTY;
3775       else if (center_element == EL_YAMYAM)
3776         Store[x][y] = level.yamyam_content[game.yamyam_content_nr].e[xx][yy];
3777       else if (element_info[center_element].content.e[xx][yy] != EL_EMPTY)
3778         Store[x][y] = element_info[center_element].content.e[xx][yy];
3779 #if 1
3780       /* needed because EL_BD_BUTTERFLY is not defined as "CAN_EXPLODE"
3781          (killing EL_BD_BUTTERFLY with dynamite would result in BD diamond
3782          otherwise) -- FIX THIS !!! */
3783       else if (!CAN_EXPLODE(element) && element != EL_BD_BUTTERFLY)
3784         Store[x][y] = element_info[element].content.e[1][1];
3785 #else
3786       else if (!CAN_EXPLODE(element))
3787         Store[x][y] = element_info[element].content.e[1][1];
3788 #endif
3789       else
3790         Store[x][y] = EL_EMPTY;
3791 #else
3792       else if (center_element == EL_MOLE)
3793         Store[x][y] = EL_EMERALD_RED;
3794       else if (center_element == EL_PENGUIN)
3795         Store[x][y] = EL_EMERALD_PURPLE;
3796       else if (center_element == EL_BUG)
3797         Store[x][y] = ((x == ex && y == ey) ? EL_DIAMOND : EL_EMERALD);
3798       else if (center_element == EL_BD_BUTTERFLY)
3799         Store[x][y] = EL_BD_DIAMOND;
3800       else if (center_element == EL_SP_ELECTRON)
3801         Store[x][y] = EL_SP_INFOTRON;
3802       else if (center_element == EL_AMOEBA_TO_DIAMOND)
3803         Store[x][y] = level.amoeba_content;
3804       else if (center_element == EL_YAMYAM)
3805         Store[x][y] = level.yamyam_content[game.yamyam_content_nr].e[xx][yy];
3806       else if (IS_CUSTOM_ELEMENT(center_element) &&
3807                element_info[center_element].content.e[xx][yy] != EL_EMPTY)
3808         Store[x][y] = element_info[center_element].content.e[xx][yy];
3809       else if (element == EL_WALL_EMERALD)
3810         Store[x][y] = EL_EMERALD;
3811       else if (element == EL_WALL_DIAMOND)
3812         Store[x][y] = EL_DIAMOND;
3813       else if (element == EL_WALL_BD_DIAMOND)
3814         Store[x][y] = EL_BD_DIAMOND;
3815       else if (element == EL_WALL_EMERALD_YELLOW)
3816         Store[x][y] = EL_EMERALD_YELLOW;
3817       else if (element == EL_WALL_EMERALD_RED)
3818         Store[x][y] = EL_EMERALD_RED;
3819       else if (element == EL_WALL_EMERALD_PURPLE)
3820         Store[x][y] = EL_EMERALD_PURPLE;
3821       else if (element == EL_WALL_PEARL)
3822         Store[x][y] = EL_PEARL;
3823       else if (element == EL_WALL_CRYSTAL)
3824         Store[x][y] = EL_CRYSTAL;
3825       else if (IS_CUSTOM_ELEMENT(element) && !CAN_EXPLODE(element))
3826         Store[x][y] = element_info[element].content.e[1][1];
3827       else
3828         Store[x][y] = EL_EMPTY;
3829 #endif
3830
3831       if (x != ex || y != ey || mode == EX_TYPE_BORDER ||
3832           center_element == EL_AMOEBA_TO_DIAMOND)
3833         Store2[x][y] = element;
3834
3835       Feld[x][y] = EL_EXPLOSION;
3836       GfxElement[x][y] = artwork_element;
3837
3838 #if 0
3839       printf(":: setting gfx(%d,%d) to %d ['%s']\n",
3840              x, y, artwork_element, EL_NAME(artwork_element));
3841 #endif
3842
3843       ExplodePhase[x][y] = 1;
3844       ExplodeDelay[x][y] = last_phase;
3845
3846       Stop[x][y] = TRUE;
3847     }
3848
3849     if (center_element == EL_YAMYAM)
3850       game.yamyam_content_nr =
3851         (game.yamyam_content_nr + 1) % level.num_yamyam_contents;
3852
3853     return;
3854   }
3855
3856   if (Stop[ex][ey])
3857     return;
3858
3859   x = ex;
3860   y = ey;
3861
3862   if (phase == 1)
3863     GfxFrame[x][y] = 0;         /* restart explosion animation */
3864
3865   last_phase = ExplodeDelay[x][y];
3866
3867   ExplodePhase[x][y] = (phase < last_phase ? phase + 1 : 0);
3868
3869 #ifdef DEBUG
3870
3871   /* activate this even in non-DEBUG version until cause for crash in
3872      getGraphicAnimationFrame() (see below) is found and eliminated */
3873
3874 #endif
3875 #if 1
3876
3877 #if 1
3878   /* this can happen if the player leaves an explosion just in time */
3879   if (GfxElement[x][y] == EL_UNDEFINED)
3880     GfxElement[x][y] = EL_EMPTY;
3881 #else
3882   if (GfxElement[x][y] == EL_UNDEFINED)
3883   {
3884     printf("\n\n");
3885     printf("Explode(): x = %d, y = %d: GfxElement == EL_UNDEFINED\n", x, y);
3886     printf("Explode(): This should never happen!\n");
3887     printf("\n\n");
3888
3889     GfxElement[x][y] = EL_EMPTY;
3890   }
3891 #endif
3892
3893 #endif
3894
3895   border_element = Store2[x][y];
3896   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y))
3897     border_element = StorePlayer[x][y];
3898
3899   if (phase == element_info[border_element].ignition_delay ||
3900       phase == last_phase)
3901   {
3902     boolean border_explosion = FALSE;
3903
3904     if (IS_PLAYER(x, y) && PLAYERINFO(x, y)->present &&
3905         !PLAYER_EXPLOSION_PROTECTED(x, y))
3906     {
3907       KillPlayerUnlessExplosionProtected(x, y);
3908       border_explosion = TRUE;
3909     }
3910     else if (CAN_EXPLODE_BY_EXPLOSION(border_element))
3911     {
3912       Feld[x][y] = Store2[x][y];
3913       Store2[x][y] = 0;
3914       Bang(x, y);
3915       border_explosion = TRUE;
3916     }
3917     else if (border_element == EL_AMOEBA_TO_DIAMOND)
3918     {
3919       AmoebeUmwandeln(x, y);
3920       Store2[x][y] = 0;
3921       border_explosion = TRUE;
3922     }
3923
3924     /* if an element just explodes due to another explosion (chain-reaction),
3925        do not immediately end the new explosion when it was the last frame of
3926        the explosion (as it would be done in the following "if"-statement!) */
3927     if (border_explosion && phase == last_phase)
3928       return;
3929   }
3930
3931   if (phase == last_phase)
3932   {
3933     int element;
3934
3935     element = Feld[x][y] = Store[x][y];
3936     Store[x][y] = Store2[x][y] = 0;
3937     GfxElement[x][y] = EL_UNDEFINED;
3938
3939     /* player can escape from explosions and might therefore be still alive */
3940     if (element >= EL_PLAYER_IS_EXPLODING_1 &&
3941         element <= EL_PLAYER_IS_EXPLODING_4)
3942     {
3943       int player_nr = element - EL_PLAYER_IS_EXPLODING_1;
3944       int explosion_element = EL_PLAYER_1 + player_nr;
3945       int xx = MIN(MAX(0, x - stored_player[player_nr].jx + 1), 2);
3946       int yy = MIN(MAX(0, y - stored_player[player_nr].jy + 1), 2);
3947
3948       if (level.use_explosion_element[player_nr])
3949         explosion_element = level.explosion_element[player_nr];
3950
3951       Feld[x][y] = (stored_player[player_nr].active ? EL_EMPTY :
3952                     element_info[explosion_element].content.e[xx][yy]);
3953     }
3954
3955     /* restore probably existing indestructible background element */
3956     if (Back[x][y] && IS_INDESTRUCTIBLE(Back[x][y]))
3957       element = Feld[x][y] = Back[x][y];
3958     Back[x][y] = 0;
3959
3960     MovDir[x][y] = MovPos[x][y] = MovDelay[x][y] = 0;
3961     GfxDir[x][y] = MV_NONE;
3962     ChangeDelay[x][y] = 0;
3963     ChangePage[x][y] = -1;
3964
3965 #if USE_NEW_CUSTOM_VALUE
3966     CustomValue[x][y] = 0;
3967 #endif
3968
3969     InitField_WithBug2(x, y, FALSE);
3970
3971     DrawLevelField(x, y);
3972
3973     TestIfElementTouchesCustomElement(x, y);
3974
3975     if (GFX_CRUMBLED(element))
3976       DrawLevelFieldCrumbledSandNeighbours(x, y);
3977
3978     if (IS_PLAYER(x, y) && !PLAYERINFO(x, y)->present)
3979       StorePlayer[x][y] = 0;
3980
3981     if (ELEM_IS_PLAYER(element))
3982       RelocatePlayer(x, y, element);
3983   }
3984   else if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
3985   {
3986     int graphic = el_act2img(GfxElement[x][y], ACTION_EXPLODING);
3987     int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
3988
3989     if (phase == delay)
3990       DrawLevelFieldCrumbledSand(x, y);
3991
3992     if (IS_WALKABLE_OVER(Back[x][y]) && Back[x][y] != EL_EMPTY)
3993     {
3994       DrawLevelElement(x, y, Back[x][y]);
3995       DrawGraphicThruMask(SCREENX(x), SCREENY(y), graphic, frame);
3996     }
3997     else if (IS_WALKABLE_UNDER(Back[x][y]))
3998     {
3999       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
4000       DrawLevelElementThruMask(x, y, Back[x][y]);
4001     }
4002     else if (!IS_WALKABLE_INSIDE(Back[x][y]))
4003       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
4004   }
4005 }
4006
4007 void DynaExplode(int ex, int ey)
4008 {
4009   int i, j;
4010   int dynabomb_element = Feld[ex][ey];
4011   int dynabomb_size = 1;
4012   boolean dynabomb_xl = FALSE;
4013   struct PlayerInfo *player;
4014   static int xy[4][2] =
4015   {
4016     { 0, -1 },
4017     { -1, 0 },
4018     { +1, 0 },
4019     { 0, +1 }
4020   };
4021
4022   if (IS_ACTIVE_BOMB(dynabomb_element))
4023   {
4024     player = &stored_player[dynabomb_element - EL_DYNABOMB_PLAYER_1_ACTIVE];
4025     dynabomb_size = player->dynabomb_size;
4026     dynabomb_xl = player->dynabomb_xl;
4027     player->dynabombs_left++;
4028   }
4029
4030   Explode(ex, ey, EX_PHASE_START, EX_TYPE_CENTER);
4031
4032   for (i = 0; i < NUM_DIRECTIONS; i++)
4033   {
4034     for (j = 1; j <= dynabomb_size; j++)
4035     {
4036       int x = ex + j * xy[i][0];
4037       int y = ey + j * xy[i][1];
4038       int element;
4039
4040       if (!IN_LEV_FIELD(x, y) || IS_INDESTRUCTIBLE(Feld[x][y]))
4041         break;
4042
4043       element = Feld[x][y];
4044
4045       /* do not restart explosions of fields with active bombs */
4046       if (element == EL_EXPLOSION && IS_ACTIVE_BOMB(Store2[x][y]))
4047         continue;
4048
4049       Explode(x, y, EX_PHASE_START, EX_TYPE_BORDER);
4050
4051       if (element != EL_EMPTY && element != EL_EXPLOSION &&
4052           !IS_DIGGABLE(element) && !dynabomb_xl)
4053         break;
4054     }
4055   }
4056 }
4057
4058 void Bang(int x, int y)
4059 {
4060   int element = MovingOrBlocked2Element(x, y);
4061   int explosion_type = EX_TYPE_NORMAL;
4062
4063   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y))
4064   {
4065     struct PlayerInfo *player = PLAYERINFO(x, y);
4066
4067     element = Feld[x][y] = (player->use_murphy ? EL_SP_MURPHY :
4068                             player->element_nr);
4069
4070     if (level.use_explosion_element[player->index_nr])
4071     {
4072       int explosion_element = level.explosion_element[player->index_nr];
4073
4074       if (element_info[explosion_element].explosion_type == EXPLODES_CROSS)
4075         explosion_type = EX_TYPE_CROSS;
4076       else if (element_info[explosion_element].explosion_type == EXPLODES_1X1)
4077         explosion_type = EX_TYPE_CENTER;
4078     }
4079   }
4080
4081   switch(element)
4082   {
4083     case EL_BUG:
4084     case EL_SPACESHIP:
4085     case EL_BD_BUTTERFLY:
4086     case EL_BD_FIREFLY:
4087     case EL_YAMYAM:
4088     case EL_DARK_YAMYAM:
4089     case EL_ROBOT:
4090     case EL_PACMAN:
4091     case EL_MOLE:
4092       RaiseScoreElement(element);
4093       break;
4094
4095     case EL_DYNABOMB_PLAYER_1_ACTIVE:
4096     case EL_DYNABOMB_PLAYER_2_ACTIVE:
4097     case EL_DYNABOMB_PLAYER_3_ACTIVE:
4098     case EL_DYNABOMB_PLAYER_4_ACTIVE:
4099     case EL_DYNABOMB_INCREASE_NUMBER:
4100     case EL_DYNABOMB_INCREASE_SIZE:
4101     case EL_DYNABOMB_INCREASE_POWER:
4102       explosion_type = EX_TYPE_DYNA;
4103       break;
4104
4105     case EL_PENGUIN:
4106     case EL_LAMP:
4107     case EL_LAMP_ACTIVE:
4108     case EL_AMOEBA_TO_DIAMOND:
4109       if (!IS_PLAYER(x, y))     /* penguin and player may be at same field */
4110         explosion_type = EX_TYPE_CENTER;
4111       break;
4112
4113     default:
4114       if (element_info[element].explosion_type == EXPLODES_CROSS)
4115         explosion_type = EX_TYPE_CROSS;
4116       else if (element_info[element].explosion_type == EXPLODES_1X1)
4117         explosion_type = EX_TYPE_CENTER;
4118       break;
4119   }
4120
4121   if (explosion_type == EX_TYPE_DYNA)
4122     DynaExplode(x, y);
4123   else
4124     Explode(x, y, EX_PHASE_START, explosion_type);
4125
4126   CheckTriggeredElementChange(x, y, element, CE_EXPLOSION_OF_X);
4127 }
4128
4129 void SplashAcid(int x, int y)
4130 {
4131   if (IN_LEV_FIELD(x - 1, y - 1) && IS_FREE(x - 1, y - 1) &&
4132       (!IN_LEV_FIELD(x - 1, y - 2) ||
4133        !CAN_FALL(MovingOrBlocked2Element(x - 1, y - 2))))
4134     Feld[x - 1][y - 1] = EL_ACID_SPLASH_LEFT;
4135
4136   if (IN_LEV_FIELD(x + 1, y - 1) && IS_FREE(x + 1, y - 1) &&
4137       (!IN_LEV_FIELD(x + 1, y - 2) ||
4138        !CAN_FALL(MovingOrBlocked2Element(x + 1, y - 2))))
4139     Feld[x + 1][y - 1] = EL_ACID_SPLASH_RIGHT;
4140
4141   PlayLevelSound(x, y, SND_ACID_SPLASHING);
4142 }
4143
4144 static void InitBeltMovement()
4145 {
4146   static int belt_base_element[4] =
4147   {
4148     EL_CONVEYOR_BELT_1_LEFT,
4149     EL_CONVEYOR_BELT_2_LEFT,
4150     EL_CONVEYOR_BELT_3_LEFT,
4151     EL_CONVEYOR_BELT_4_LEFT
4152   };
4153   static int belt_base_active_element[4] =
4154   {
4155     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
4156     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
4157     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
4158     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
4159   };
4160
4161   int x, y, i, j;
4162
4163   /* set frame order for belt animation graphic according to belt direction */
4164   for (i = 0; i < NUM_BELTS; i++)
4165   {
4166     int belt_nr = i;
4167
4168     for (j = 0; j < NUM_BELT_PARTS; j++)
4169     {
4170       int element = belt_base_active_element[belt_nr] + j;
4171       int graphic = el2img(element);
4172
4173       if (game.belt_dir[i] == MV_LEFT)
4174         graphic_info[graphic].anim_mode &= ~ANIM_REVERSE;
4175       else
4176         graphic_info[graphic].anim_mode |=  ANIM_REVERSE;
4177     }
4178   }
4179
4180 #if 1
4181   SCAN_PLAYFIELD(x, y)
4182 #else
4183   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
4184 #endif
4185   {
4186     int element = Feld[x][y];
4187
4188     for (i = 0; i < NUM_BELTS; i++)
4189     {
4190       if (IS_BELT(element) && game.belt_dir[i] != MV_NONE)
4191       {
4192         int e_belt_nr = getBeltNrFromBeltElement(element);
4193         int belt_nr = i;
4194
4195         if (e_belt_nr == belt_nr)
4196         {
4197           int belt_part = Feld[x][y] - belt_base_element[belt_nr];
4198
4199           Feld[x][y] = belt_base_active_element[belt_nr] + belt_part;
4200         }
4201       }
4202     }
4203   }
4204 }
4205
4206 static void ToggleBeltSwitch(int x, int y)
4207 {
4208   static int belt_base_element[4] =
4209   {
4210     EL_CONVEYOR_BELT_1_LEFT,
4211     EL_CONVEYOR_BELT_2_LEFT,
4212     EL_CONVEYOR_BELT_3_LEFT,
4213     EL_CONVEYOR_BELT_4_LEFT
4214   };
4215   static int belt_base_active_element[4] =
4216   {
4217     EL_CONVEYOR_BELT_1_LEFT_ACTIVE,
4218     EL_CONVEYOR_BELT_2_LEFT_ACTIVE,
4219     EL_CONVEYOR_BELT_3_LEFT_ACTIVE,
4220     EL_CONVEYOR_BELT_4_LEFT_ACTIVE
4221   };
4222   static int belt_base_switch_element[4] =
4223   {
4224     EL_CONVEYOR_BELT_1_SWITCH_LEFT,
4225     EL_CONVEYOR_BELT_2_SWITCH_LEFT,
4226     EL_CONVEYOR_BELT_3_SWITCH_LEFT,
4227     EL_CONVEYOR_BELT_4_SWITCH_LEFT
4228   };
4229   static int belt_move_dir[4] =
4230   {
4231     MV_LEFT,
4232     MV_NONE,
4233     MV_RIGHT,
4234     MV_NONE,
4235   };
4236
4237   int element = Feld[x][y];
4238   int belt_nr = getBeltNrFromBeltSwitchElement(element);
4239   int belt_dir_nr = (game.belt_dir_nr[belt_nr] + 1) % 4;
4240   int belt_dir = belt_move_dir[belt_dir_nr];
4241   int xx, yy, i;
4242
4243   if (!IS_BELT_SWITCH(element))
4244     return;
4245
4246   game.belt_dir_nr[belt_nr] = belt_dir_nr;
4247   game.belt_dir[belt_nr] = belt_dir;
4248
4249   if (belt_dir_nr == 3)
4250     belt_dir_nr = 1;
4251
4252   /* set frame order for belt animation graphic according to belt direction */
4253   for (i = 0; i < NUM_BELT_PARTS; i++)
4254   {
4255     int element = belt_base_active_element[belt_nr] + i;
4256     int graphic = el2img(element);
4257
4258     if (belt_dir == MV_LEFT)
4259       graphic_info[graphic].anim_mode &= ~ANIM_REVERSE;
4260     else
4261       graphic_info[graphic].anim_mode |=  ANIM_REVERSE;
4262   }
4263
4264 #if 1
4265   SCAN_PLAYFIELD(xx, yy)
4266 #else
4267   for (yy = 0; yy < lev_fieldy; yy++) for (xx = 0; xx < lev_fieldx; xx++)
4268 #endif
4269   {
4270     int element = Feld[xx][yy];
4271
4272     if (IS_BELT_SWITCH(element))
4273     {
4274       int e_belt_nr = getBeltNrFromBeltSwitchElement(element);
4275
4276       if (e_belt_nr == belt_nr)
4277       {
4278         Feld[xx][yy] = belt_base_switch_element[belt_nr] + belt_dir_nr;
4279         DrawLevelField(xx, yy);
4280       }
4281     }
4282     else if (IS_BELT(element) && belt_dir != MV_NONE)
4283     {
4284       int e_belt_nr = getBeltNrFromBeltElement(element);
4285
4286       if (e_belt_nr == belt_nr)
4287       {
4288         int belt_part = Feld[xx][yy] - belt_base_element[belt_nr];
4289
4290         Feld[xx][yy] = belt_base_active_element[belt_nr] + belt_part;
4291         DrawLevelField(xx, yy);
4292       }
4293     }
4294     else if (IS_BELT_ACTIVE(element) && belt_dir == MV_NONE)
4295     {
4296       int e_belt_nr = getBeltNrFromBeltActiveElement(element);
4297
4298       if (e_belt_nr == belt_nr)
4299       {
4300         int belt_part = Feld[xx][yy] - belt_base_active_element[belt_nr];
4301
4302         Feld[xx][yy] = belt_base_element[belt_nr] + belt_part;
4303         DrawLevelField(xx, yy);
4304       }
4305     }
4306   }
4307 }
4308
4309 static void ToggleSwitchgateSwitch(int x, int y)
4310 {
4311   int xx, yy;
4312
4313   game.switchgate_pos = !game.switchgate_pos;
4314
4315 #if 1
4316   SCAN_PLAYFIELD(xx, yy)
4317 #else
4318   for (yy = 0; yy < lev_fieldy; yy++) for (xx = 0; xx < lev_fieldx; xx++)
4319 #endif
4320   {
4321     int element = Feld[xx][yy];
4322
4323     if (element == EL_SWITCHGATE_SWITCH_UP ||
4324         element == EL_SWITCHGATE_SWITCH_DOWN)
4325     {
4326       Feld[xx][yy] = EL_SWITCHGATE_SWITCH_UP + game.switchgate_pos;
4327       DrawLevelField(xx, yy);
4328     }
4329     else if (element == EL_SWITCHGATE_OPEN ||
4330              element == EL_SWITCHGATE_OPENING)
4331     {
4332       Feld[xx][yy] = EL_SWITCHGATE_CLOSING;
4333
4334       PlayLevelSoundAction(xx, yy, ACTION_CLOSING);
4335     }
4336     else if (element == EL_SWITCHGATE_CLOSED ||
4337              element == EL_SWITCHGATE_CLOSING)
4338     {
4339       Feld[xx][yy] = EL_SWITCHGATE_OPENING;
4340
4341       PlayLevelSoundAction(xx, yy, ACTION_OPENING);
4342     }
4343   }
4344 }
4345
4346 static int getInvisibleActiveFromInvisibleElement(int element)
4347 {
4348   return (element == EL_INVISIBLE_STEELWALL ? EL_INVISIBLE_STEELWALL_ACTIVE :
4349           element == EL_INVISIBLE_WALL      ? EL_INVISIBLE_WALL_ACTIVE :
4350           element == EL_INVISIBLE_SAND      ? EL_INVISIBLE_SAND_ACTIVE :
4351           element);
4352 }
4353
4354 static int getInvisibleFromInvisibleActiveElement(int element)
4355 {
4356   return (element == EL_INVISIBLE_STEELWALL_ACTIVE ? EL_INVISIBLE_STEELWALL :
4357           element == EL_INVISIBLE_WALL_ACTIVE      ? EL_INVISIBLE_WALL :
4358           element == EL_INVISIBLE_SAND_ACTIVE      ? EL_INVISIBLE_SAND :
4359           element);
4360 }
4361
4362 static void RedrawAllLightSwitchesAndInvisibleElements()
4363 {
4364   int x, y;
4365
4366 #if 1
4367   SCAN_PLAYFIELD(x, y)
4368 #else
4369   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
4370 #endif
4371   {
4372     int element = Feld[x][y];
4373
4374     if (element == EL_LIGHT_SWITCH &&
4375         game.light_time_left > 0)
4376     {
4377       Feld[x][y] = EL_LIGHT_SWITCH_ACTIVE;
4378       DrawLevelField(x, y);
4379     }
4380     else if (element == EL_LIGHT_SWITCH_ACTIVE &&
4381              game.light_time_left == 0)
4382     {
4383       Feld[x][y] = EL_LIGHT_SWITCH;
4384       DrawLevelField(x, y);
4385     }
4386     else if (element == EL_EMC_DRIPPER &&
4387              game.light_time_left > 0)
4388     {
4389       Feld[x][y] = EL_EMC_DRIPPER_ACTIVE;
4390       DrawLevelField(x, y);
4391     }
4392     else if (element == EL_EMC_DRIPPER_ACTIVE &&
4393              game.light_time_left == 0)
4394     {
4395       Feld[x][y] = EL_EMC_DRIPPER;
4396       DrawLevelField(x, y);
4397     }
4398     else if (element == EL_INVISIBLE_STEELWALL ||
4399              element == EL_INVISIBLE_WALL ||
4400              element == EL_INVISIBLE_SAND)
4401     {
4402       if (game.light_time_left > 0)
4403         Feld[x][y] = getInvisibleActiveFromInvisibleElement(element);
4404
4405       DrawLevelField(x, y);
4406
4407       /* uncrumble neighbour fields, if needed */
4408       if (element == EL_INVISIBLE_SAND)
4409         DrawLevelFieldCrumbledSandNeighbours(x, y);
4410     }
4411     else if (element == EL_INVISIBLE_STEELWALL_ACTIVE ||
4412              element == EL_INVISIBLE_WALL_ACTIVE ||
4413              element == EL_INVISIBLE_SAND_ACTIVE)
4414     {
4415       if (game.light_time_left == 0)
4416         Feld[x][y] = getInvisibleFromInvisibleActiveElement(element);
4417
4418       DrawLevelField(x, y);
4419
4420       /* re-crumble neighbour fields, if needed */
4421       if (element == EL_INVISIBLE_SAND)
4422         DrawLevelFieldCrumbledSandNeighbours(x, y);
4423     }
4424   }
4425 }
4426
4427 static void RedrawAllInvisibleElementsForLenses()
4428 {
4429   int x, y;
4430
4431 #if 1
4432   SCAN_PLAYFIELD(x, y)
4433 #else
4434   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
4435 #endif
4436   {
4437     int element = Feld[x][y];
4438
4439     if (element == EL_EMC_DRIPPER &&
4440         game.lenses_time_left > 0)
4441     {
4442       Feld[x][y] = EL_EMC_DRIPPER_ACTIVE;
4443       DrawLevelField(x, y);
4444     }
4445     else if (element == EL_EMC_DRIPPER_ACTIVE &&
4446              game.lenses_time_left == 0)
4447     {
4448       Feld[x][y] = EL_EMC_DRIPPER;
4449       DrawLevelField(x, y);
4450     }
4451     else if (element == EL_INVISIBLE_STEELWALL ||
4452              element == EL_INVISIBLE_WALL ||
4453              element == EL_INVISIBLE_SAND)
4454     {
4455       if (game.lenses_time_left > 0)
4456         Feld[x][y] = getInvisibleActiveFromInvisibleElement(element);
4457
4458       DrawLevelField(x, y);
4459
4460       /* uncrumble neighbour fields, if needed */
4461       if (element == EL_INVISIBLE_SAND)
4462         DrawLevelFieldCrumbledSandNeighbours(x, y);
4463     }
4464     else if (element == EL_INVISIBLE_STEELWALL_ACTIVE ||
4465              element == EL_INVISIBLE_WALL_ACTIVE ||
4466              element == EL_INVISIBLE_SAND_ACTIVE)
4467     {
4468       if (game.lenses_time_left == 0)
4469         Feld[x][y] = getInvisibleFromInvisibleActiveElement(element);
4470
4471       DrawLevelField(x, y);
4472
4473       /* re-crumble neighbour fields, if needed */
4474       if (element == EL_INVISIBLE_SAND)
4475         DrawLevelFieldCrumbledSandNeighbours(x, y);
4476     }
4477   }
4478 }
4479
4480 static void RedrawAllInvisibleElementsForMagnifier()
4481 {
4482   int x, y;
4483
4484 #if 1
4485   SCAN_PLAYFIELD(x, y)
4486 #else
4487   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
4488 #endif
4489   {
4490     int element = Feld[x][y];
4491
4492     if (element == EL_EMC_FAKE_GRASS &&
4493         game.magnify_time_left > 0)
4494     {
4495       Feld[x][y] = EL_EMC_FAKE_GRASS_ACTIVE;
4496       DrawLevelField(x, y);
4497     }
4498     else if (element == EL_EMC_FAKE_GRASS_ACTIVE &&
4499              game.magnify_time_left == 0)
4500     {
4501       Feld[x][y] = EL_EMC_FAKE_GRASS;
4502       DrawLevelField(x, y);
4503     }
4504     else if (IS_GATE_GRAY(element) &&
4505              game.magnify_time_left > 0)
4506     {
4507       Feld[x][y] = (IS_RND_GATE_GRAY(element) ?
4508                     element - EL_GATE_1_GRAY + EL_GATE_1_GRAY_ACTIVE :
4509                     IS_EM_GATE_GRAY(element) ?
4510                     element - EL_EM_GATE_1_GRAY + EL_EM_GATE_1_GRAY_ACTIVE :
4511                     IS_EMC_GATE_GRAY(element) ?
4512                     element - EL_EMC_GATE_5_GRAY + EL_EMC_GATE_5_GRAY_ACTIVE :
4513                     element);
4514       DrawLevelField(x, y);
4515     }
4516     else if (IS_GATE_GRAY_ACTIVE(element) &&
4517              game.magnify_time_left == 0)
4518     {
4519       Feld[x][y] = (IS_RND_GATE_GRAY_ACTIVE(element) ?
4520                     element - EL_GATE_1_GRAY_ACTIVE + EL_GATE_1_GRAY :
4521                     IS_EM_GATE_GRAY_ACTIVE(element) ?
4522                     element - EL_EM_GATE_1_GRAY_ACTIVE + EL_EM_GATE_1_GRAY :
4523                     IS_EMC_GATE_GRAY_ACTIVE(element) ?
4524                     element - EL_EMC_GATE_5_GRAY_ACTIVE + EL_EMC_GATE_5_GRAY :
4525                     element);
4526       DrawLevelField(x, y);
4527     }
4528   }
4529 }
4530
4531 static void ToggleLightSwitch(int x, int y)
4532 {
4533   int element = Feld[x][y];
4534
4535   game.light_time_left =
4536     (element == EL_LIGHT_SWITCH ?
4537      level.time_light * FRAMES_PER_SECOND : 0);
4538
4539   RedrawAllLightSwitchesAndInvisibleElements();
4540 }
4541
4542 static void ActivateTimegateSwitch(int x, int y)
4543 {
4544   int xx, yy;
4545
4546   game.timegate_time_left = level.time_timegate * FRAMES_PER_SECOND;
4547
4548 #if 1
4549   SCAN_PLAYFIELD(xx, yy)
4550 #else
4551   for (yy = 0; yy < lev_fieldy; yy++) for (xx = 0; xx < lev_fieldx; xx++)
4552 #endif
4553   {
4554     int element = Feld[xx][yy];
4555
4556     if (element == EL_TIMEGATE_CLOSED ||
4557         element == EL_TIMEGATE_CLOSING)
4558     {
4559       Feld[xx][yy] = EL_TIMEGATE_OPENING;
4560       PlayLevelSound(xx, yy, SND_TIMEGATE_OPENING);
4561     }
4562
4563     /*
4564     else if (element == EL_TIMEGATE_SWITCH_ACTIVE)
4565     {
4566       Feld[xx][yy] = EL_TIMEGATE_SWITCH;
4567       DrawLevelField(xx, yy);
4568     }
4569     */
4570
4571   }
4572
4573   Feld[x][y] = EL_TIMEGATE_SWITCH_ACTIVE;
4574 }
4575
4576 void Impact(int x, int y)
4577 {
4578   boolean last_line = (y == lev_fieldy - 1);
4579   boolean object_hit = FALSE;
4580   boolean impact = (last_line || object_hit);
4581   int element = Feld[x][y];
4582   int smashed = EL_STEELWALL;
4583
4584   if (!last_line)       /* check if element below was hit */
4585   {
4586     if (Feld[x][y + 1] == EL_PLAYER_IS_LEAVING)
4587       return;
4588
4589     object_hit = (!IS_FREE(x, y + 1) && (!IS_MOVING(x, y + 1) ||
4590                                          MovDir[x][y + 1] != MV_DOWN ||
4591                                          MovPos[x][y + 1] <= TILEY / 2));
4592
4593     /* do not smash moving elements that left the smashed field in time */
4594     if (game.engine_version >= VERSION_IDENT(2,2,0,7) && IS_MOVING(x, y + 1) &&
4595         ABS(MovPos[x][y + 1] + getElementMoveStepsize(x, y + 1)) >= TILEX)
4596       object_hit = FALSE;
4597
4598 #if USE_QUICKSAND_IMPACT_BUGFIX
4599     if (Feld[x][y + 1] == EL_QUICKSAND_EMPTYING && object_hit == FALSE)
4600     {
4601       RemoveMovingField(x, y + 1);
4602       Feld[x][y + 1] = EL_QUICKSAND_EMPTY;
4603       Feld[x][y + 2] = EL_ROCK;
4604       DrawLevelField(x, y + 2);
4605
4606       object_hit = TRUE;
4607     }
4608 #endif
4609
4610     if (object_hit)
4611       smashed = MovingOrBlocked2Element(x, y + 1);
4612
4613     impact = (last_line || object_hit);
4614   }
4615
4616   if (!last_line && smashed == EL_ACID) /* element falls into acid */
4617   {
4618     SplashAcid(x, y + 1);
4619     return;
4620   }
4621
4622   /* !!! not sufficient for all cases -- see EL_PEARL below !!! */
4623   /* only reset graphic animation if graphic really changes after impact */
4624   if (impact &&
4625       el_act_dir2img(element, GfxAction[x][y], MV_DOWN) != el2img(element))
4626   {
4627     ResetGfxAnimation(x, y);
4628     DrawLevelField(x, y);
4629   }
4630
4631   if (impact && CAN_EXPLODE_IMPACT(element))
4632   {
4633     Bang(x, y);
4634     return;
4635   }
4636   else if (impact && element == EL_PEARL)
4637   {
4638     ResetGfxAnimation(x, y);
4639
4640     Feld[x][y] = EL_PEARL_BREAKING;
4641     PlayLevelSound(x, y, SND_PEARL_BREAKING);
4642     return;
4643   }
4644   else if (impact && CheckElementChange(x, y, element, smashed, CE_IMPACT))
4645   {
4646     PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
4647
4648     return;
4649   }
4650
4651   if (impact && element == EL_AMOEBA_DROP)
4652   {
4653     if (object_hit && IS_PLAYER(x, y + 1))
4654       KillPlayerUnlessEnemyProtected(x, y + 1);
4655     else if (object_hit && smashed == EL_PENGUIN)
4656       Bang(x, y + 1);
4657     else
4658     {
4659       Feld[x][y] = EL_AMOEBA_GROWING;
4660       Store[x][y] = EL_AMOEBA_WET;
4661
4662       ResetRandomAnimationValue(x, y);
4663     }
4664     return;
4665   }
4666
4667   if (object_hit)               /* check which object was hit */
4668   {
4669     if (CAN_PASS_MAGIC_WALL(element) &&
4670         (smashed == EL_MAGIC_WALL ||
4671          smashed == EL_BD_MAGIC_WALL))
4672     {
4673       int xx, yy;
4674       int activated_magic_wall =
4675         (smashed == EL_MAGIC_WALL ? EL_MAGIC_WALL_ACTIVE :
4676          EL_BD_MAGIC_WALL_ACTIVE);
4677
4678       /* activate magic wall / mill */
4679 #if 1
4680       SCAN_PLAYFIELD(xx, yy)
4681 #else
4682       for (yy = 0; yy < lev_fieldy; yy++) for (xx = 0; xx < lev_fieldx; xx++)
4683 #endif
4684         if (Feld[xx][yy] == smashed)
4685           Feld[xx][yy] = activated_magic_wall;
4686
4687       game.magic_wall_time_left = level.time_magic_wall * FRAMES_PER_SECOND;
4688       game.magic_wall_active = TRUE;
4689
4690       PlayLevelSound(x, y, (smashed == EL_MAGIC_WALL ?
4691                             SND_MAGIC_WALL_ACTIVATING :
4692                             SND_BD_MAGIC_WALL_ACTIVATING));
4693     }
4694
4695     if (IS_PLAYER(x, y + 1))
4696     {
4697       if (CAN_SMASH_PLAYER(element))
4698       {
4699         KillPlayerUnlessEnemyProtected(x, y + 1);
4700         return;
4701       }
4702     }
4703     else if (smashed == EL_PENGUIN)
4704     {
4705       if (CAN_SMASH_PLAYER(element))
4706       {
4707         Bang(x, y + 1);
4708         return;
4709       }
4710     }
4711     else if (element == EL_BD_DIAMOND)
4712     {
4713       if (IS_CLASSIC_ENEMY(smashed) && IS_BD_ELEMENT(smashed))
4714       {
4715         Bang(x, y + 1);
4716         return;
4717       }
4718     }
4719     else if (((element == EL_SP_INFOTRON ||
4720                element == EL_SP_ZONK) &&
4721               (smashed == EL_SP_SNIKSNAK ||
4722                smashed == EL_SP_ELECTRON ||
4723                smashed == EL_SP_DISK_ORANGE)) ||
4724              (element == EL_SP_INFOTRON &&
4725               smashed == EL_SP_DISK_YELLOW))
4726     {
4727       Bang(x, y + 1);
4728       return;
4729     }
4730     else if (CAN_SMASH_EVERYTHING(element))
4731     {
4732       if (IS_CLASSIC_ENEMY(smashed) ||
4733           CAN_EXPLODE_SMASHED(smashed))
4734       {
4735         Bang(x, y + 1);
4736         return;
4737       }
4738       else if (!IS_MOVING(x, y + 1) && !IS_BLOCKED(x, y + 1))
4739       {
4740         if (smashed == EL_LAMP ||
4741             smashed == EL_LAMP_ACTIVE)
4742         {
4743           Bang(x, y + 1);
4744           return;
4745         }
4746         else if (smashed == EL_NUT)
4747         {
4748           Feld[x][y + 1] = EL_NUT_BREAKING;
4749           PlayLevelSound(x, y, SND_NUT_BREAKING);
4750           RaiseScoreElement(EL_NUT);
4751           return;
4752         }
4753         else if (smashed == EL_PEARL)
4754         {
4755           ResetGfxAnimation(x, y);
4756
4757           Feld[x][y + 1] = EL_PEARL_BREAKING;
4758           PlayLevelSound(x, y, SND_PEARL_BREAKING);
4759           return;
4760         }
4761         else if (smashed == EL_DIAMOND)
4762         {
4763           Feld[x][y + 1] = EL_DIAMOND_BREAKING;
4764           PlayLevelSound(x, y, SND_DIAMOND_BREAKING);
4765           return;
4766         }
4767         else if (IS_BELT_SWITCH(smashed))
4768         {
4769           ToggleBeltSwitch(x, y + 1);
4770         }
4771         else if (smashed == EL_SWITCHGATE_SWITCH_UP ||
4772                  smashed == EL_SWITCHGATE_SWITCH_DOWN)
4773         {
4774           ToggleSwitchgateSwitch(x, y + 1);
4775         }
4776         else if (smashed == EL_LIGHT_SWITCH ||
4777                  smashed == EL_LIGHT_SWITCH_ACTIVE)
4778         {
4779           ToggleLightSwitch(x, y + 1);
4780         }
4781         else
4782         {
4783 #if 0
4784           TestIfElementSmashesCustomElement(x, y, MV_DOWN);
4785 #endif
4786
4787           CheckElementChange(x, y + 1, smashed, element, CE_SMASHED);
4788
4789           CheckElementChangeBySide(x, y + 1, smashed, element,
4790                                    CE_SWITCHED, CH_SIDE_TOP);
4791           CheckTriggeredElementChangeBySide(x, y + 1, smashed, CE_SWITCH_OF_X,
4792                                             CH_SIDE_TOP);
4793         }
4794       }
4795       else
4796       {
4797         CheckElementChange(x, y + 1, smashed, element, CE_SMASHED);
4798       }
4799     }
4800   }
4801
4802   /* play sound of magic wall / mill */
4803   if (!last_line &&
4804       (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ||
4805        Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE))
4806   {
4807     if (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE)
4808       PlayLevelSound(x, y, SND_MAGIC_WALL_FILLING);
4809     else if (Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)
4810       PlayLevelSound(x, y, SND_BD_MAGIC_WALL_FILLING);
4811
4812     return;
4813   }
4814
4815   /* play sound of object that hits the ground */
4816   if (last_line || object_hit)
4817     PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
4818 }
4819
4820 inline static void TurnRoundExt(int x, int y)
4821 {
4822   static struct
4823   {
4824     int dx, dy;
4825   } move_xy[] =
4826   {
4827     {  0,  0 },
4828     { -1,  0 },
4829     { +1,  0 },
4830     {  0,  0 },
4831     {  0, -1 },
4832     {  0,  0 }, { 0, 0 }, { 0, 0 },
4833     {  0, +1 }
4834   };
4835   static struct
4836   {
4837     int left, right, back;
4838   } turn[] =
4839   {
4840     { 0,        0,              0        },
4841     { MV_DOWN,  MV_UP,          MV_RIGHT },
4842     { MV_UP,    MV_DOWN,        MV_LEFT  },
4843     { 0,        0,              0        },
4844     { MV_LEFT,  MV_RIGHT,       MV_DOWN  },
4845     { 0,        0,              0        },
4846     { 0,        0,              0        },
4847     { 0,        0,              0        },
4848     { MV_RIGHT, MV_LEFT,        MV_UP    }
4849   };
4850
4851   int element = Feld[x][y];
4852   int move_pattern = element_info[element].move_pattern;
4853
4854   int old_move_dir = MovDir[x][y];
4855   int left_dir  = turn[old_move_dir].left;
4856   int right_dir = turn[old_move_dir].right;
4857   int back_dir  = turn[old_move_dir].back;
4858
4859   int left_dx  = move_xy[left_dir].dx,     left_dy  = move_xy[left_dir].dy;
4860   int right_dx = move_xy[right_dir].dx,    right_dy = move_xy[right_dir].dy;
4861   int move_dx  = move_xy[old_move_dir].dx, move_dy  = move_xy[old_move_dir].dy;
4862   int back_dx  = move_xy[back_dir].dx,     back_dy  = move_xy[back_dir].dy;
4863
4864   int left_x  = x + left_dx,  left_y  = y + left_dy;
4865   int right_x = x + right_dx, right_y = y + right_dy;
4866   int move_x  = x + move_dx,  move_y  = y + move_dy;
4867
4868   int xx, yy;
4869
4870   if (element == EL_BUG || element == EL_BD_BUTTERFLY)
4871   {
4872     TestIfBadThingTouchesOtherBadThing(x, y);
4873
4874     if (ENEMY_CAN_ENTER_FIELD(element, right_x, right_y))
4875       MovDir[x][y] = right_dir;
4876     else if (!ENEMY_CAN_ENTER_FIELD(element, move_x, move_y))
4877       MovDir[x][y] = left_dir;
4878
4879     if (element == EL_BUG && MovDir[x][y] != old_move_dir)
4880       MovDelay[x][y] = 9;
4881     else if (element == EL_BD_BUTTERFLY)     /* && MovDir[x][y] == left_dir) */
4882       MovDelay[x][y] = 1;
4883   }
4884   else if (element == EL_SPACESHIP || element == EL_BD_FIREFLY)
4885   {
4886     TestIfBadThingTouchesOtherBadThing(x, y);
4887
4888     if (ENEMY_CAN_ENTER_FIELD(element, left_x, left_y))
4889       MovDir[x][y] = left_dir;
4890     else if (!ENEMY_CAN_ENTER_FIELD(element, move_x, move_y))
4891       MovDir[x][y] = right_dir;
4892
4893     if (element == EL_SPACESHIP && MovDir[x][y] != old_move_dir)
4894       MovDelay[x][y] = 9;
4895     else if (element == EL_BD_FIREFLY)      /* && MovDir[x][y] == right_dir) */
4896       MovDelay[x][y] = 1;
4897   }
4898   else if (element == EL_SP_SNIKSNAK || element == EL_SP_ELECTRON)
4899   {
4900     TestIfBadThingTouchesOtherBadThing(x, y);
4901
4902     if (ELEMENT_CAN_ENTER_FIELD_BASE_4(element, left_x, left_y, 0))
4903       MovDir[x][y] = left_dir;
4904     else if (!ELEMENT_CAN_ENTER_FIELD_BASE_4(element, move_x, move_y, 0))
4905       MovDir[x][y] = right_dir;
4906
4907     if (MovDir[x][y] != old_move_dir)
4908       MovDelay[x][y] = 9;
4909   }
4910   else if (element == EL_YAMYAM)
4911   {
4912     boolean can_turn_left  = YAMYAM_CAN_ENTER_FIELD(element, left_x, left_y);
4913     boolean can_turn_right = YAMYAM_CAN_ENTER_FIELD(element, right_x, right_y);
4914
4915     if (can_turn_left && can_turn_right)
4916       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
4917     else if (can_turn_left)
4918       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
4919     else if (can_turn_right)
4920       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
4921     else
4922       MovDir[x][y] = back_dir;
4923
4924     MovDelay[x][y] = 16 + 16 * RND(3);
4925   }
4926   else if (element == EL_DARK_YAMYAM)
4927   {
4928     boolean can_turn_left  = DARK_YAMYAM_CAN_ENTER_FIELD(element,
4929                                                          left_x, left_y);
4930     boolean can_turn_right = DARK_YAMYAM_CAN_ENTER_FIELD(element,
4931                                                          right_x, right_y);
4932
4933     if (can_turn_left && can_turn_right)
4934       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
4935     else if (can_turn_left)
4936       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
4937     else if (can_turn_right)
4938       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
4939     else
4940       MovDir[x][y] = back_dir;
4941
4942     MovDelay[x][y] = 16 + 16 * RND(3);
4943   }
4944   else if (element == EL_PACMAN)
4945   {
4946     boolean can_turn_left  = PACMAN_CAN_ENTER_FIELD(element, left_x, left_y);
4947     boolean can_turn_right = PACMAN_CAN_ENTER_FIELD(element, right_x, right_y);
4948
4949     if (can_turn_left && can_turn_right)
4950       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
4951     else if (can_turn_left)
4952       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
4953     else if (can_turn_right)
4954       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
4955     else
4956       MovDir[x][y] = back_dir;
4957
4958     MovDelay[x][y] = 6 + RND(40);
4959   }
4960   else if (element == EL_PIG)
4961   {
4962     boolean can_turn_left  = PIG_CAN_ENTER_FIELD(element, left_x, left_y);
4963     boolean can_turn_right = PIG_CAN_ENTER_FIELD(element, right_x, right_y);
4964     boolean can_move_on    = PIG_CAN_ENTER_FIELD(element, move_x, move_y);
4965     boolean should_turn_left, should_turn_right, should_move_on;
4966     int rnd_value = 24;
4967     int rnd = RND(rnd_value);
4968
4969     should_turn_left = (can_turn_left &&
4970                         (!can_move_on ||
4971                          IN_LEV_FIELD_AND_NOT_FREE(x + back_dx + left_dx,
4972                                                    y + back_dy + left_dy)));
4973     should_turn_right = (can_turn_right &&
4974                          (!can_move_on ||
4975                           IN_LEV_FIELD_AND_NOT_FREE(x + back_dx + right_dx,
4976                                                     y + back_dy + right_dy)));
4977     should_move_on = (can_move_on &&
4978                       (!can_turn_left ||
4979                        !can_turn_right ||
4980                        IN_LEV_FIELD_AND_NOT_FREE(x + move_dx + left_dx,
4981                                                  y + move_dy + left_dy) ||
4982                        IN_LEV_FIELD_AND_NOT_FREE(x + move_dx + right_dx,
4983                                                  y + move_dy + right_dy)));
4984
4985     if (should_turn_left || should_turn_right || should_move_on)
4986     {
4987       if (should_turn_left && should_turn_right && should_move_on)
4988         MovDir[x][y] = (rnd < rnd_value / 3     ? left_dir :
4989                         rnd < 2 * rnd_value / 3 ? right_dir :
4990                         old_move_dir);
4991       else if (should_turn_left && should_turn_right)
4992         MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
4993       else if (should_turn_left && should_move_on)
4994         MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : old_move_dir);
4995       else if (should_turn_right && should_move_on)
4996         MovDir[x][y] = (rnd < rnd_value / 2 ? right_dir : old_move_dir);
4997       else if (should_turn_left)
4998         MovDir[x][y] = left_dir;
4999       else if (should_turn_right)
5000         MovDir[x][y] = right_dir;
5001       else if (should_move_on)
5002         MovDir[x][y] = old_move_dir;
5003     }
5004     else if (can_move_on && rnd > rnd_value / 8)
5005       MovDir[x][y] = old_move_dir;
5006     else if (can_turn_left && can_turn_right)
5007       MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
5008     else if (can_turn_left && rnd > rnd_value / 8)
5009       MovDir[x][y] = left_dir;
5010     else if (can_turn_right && rnd > rnd_value/8)
5011       MovDir[x][y] = right_dir;
5012     else
5013       MovDir[x][y] = back_dir;
5014
5015     xx = x + move_xy[MovDir[x][y]].dx;
5016     yy = y + move_xy[MovDir[x][y]].dy;
5017
5018     if (!IN_LEV_FIELD(xx, yy) ||
5019         (!IS_FREE(xx, yy) && !IS_FOOD_PIG(Feld[xx][yy])))
5020       MovDir[x][y] = old_move_dir;
5021
5022     MovDelay[x][y] = 0;
5023   }
5024   else if (element == EL_DRAGON)
5025   {
5026     boolean can_turn_left  = DRAGON_CAN_ENTER_FIELD(element, left_x, left_y);
5027     boolean can_turn_right = DRAGON_CAN_ENTER_FIELD(element, right_x, right_y);
5028     boolean can_move_on    = DRAGON_CAN_ENTER_FIELD(element, move_x, move_y);
5029     int rnd_value = 24;
5030     int rnd = RND(rnd_value);
5031
5032     if (can_move_on && rnd > rnd_value / 8)
5033       MovDir[x][y] = old_move_dir;
5034     else if (can_turn_left && can_turn_right)
5035       MovDir[x][y] = (rnd < rnd_value / 2 ? left_dir : right_dir);
5036     else if (can_turn_left && rnd > rnd_value / 8)
5037       MovDir[x][y] = left_dir;
5038     else if (can_turn_right && rnd > rnd_value / 8)
5039       MovDir[x][y] = right_dir;
5040     else
5041       MovDir[x][y] = back_dir;
5042
5043     xx = x + move_xy[MovDir[x][y]].dx;
5044     yy = y + move_xy[MovDir[x][y]].dy;
5045
5046     if (!IN_LEV_FIELD_AND_IS_FREE(xx, yy))
5047       MovDir[x][y] = old_move_dir;
5048
5049     MovDelay[x][y] = 0;
5050   }
5051   else if (element == EL_MOLE)
5052   {
5053     boolean can_move_on =
5054       (MOLE_CAN_ENTER_FIELD(element, move_x, move_y,
5055                             IS_AMOEBOID(Feld[move_x][move_y]) ||
5056                             Feld[move_x][move_y] == EL_AMOEBA_SHRINKING));
5057     if (!can_move_on)
5058     {
5059       boolean can_turn_left =
5060         (MOLE_CAN_ENTER_FIELD(element, left_x, left_y,
5061                               IS_AMOEBOID(Feld[left_x][left_y])));
5062
5063       boolean can_turn_right =
5064         (MOLE_CAN_ENTER_FIELD(element, right_x, right_y,
5065                               IS_AMOEBOID(Feld[right_x][right_y])));
5066
5067       if (can_turn_left && can_turn_right)
5068         MovDir[x][y] = (RND(2) ? left_dir : right_dir);
5069       else if (can_turn_left)
5070         MovDir[x][y] = left_dir;
5071       else
5072         MovDir[x][y] = right_dir;
5073     }
5074
5075     if (MovDir[x][y] != old_move_dir)
5076       MovDelay[x][y] = 9;
5077   }
5078   else if (element == EL_BALLOON)
5079   {
5080     MovDir[x][y] = game.wind_direction;
5081     MovDelay[x][y] = 0;
5082   }
5083   else if (element == EL_SPRING)
5084   {
5085 #if USE_NEW_SPRING_BUMPER
5086     if (MovDir[x][y] & MV_HORIZONTAL)
5087     {
5088       if (SPRING_CAN_BUMP_FROM_FIELD(move_x, move_y) &&
5089           !SPRING_CAN_ENTER_FIELD(element, x, y + 1))
5090       {
5091         Feld[move_x][move_y] = EL_EMC_SPRING_BUMPER_ACTIVE;
5092         ResetGfxAnimation(move_x, move_y);
5093         DrawLevelField(move_x, move_y);
5094
5095         MovDir[x][y] = back_dir;
5096       }
5097       else if (!SPRING_CAN_ENTER_FIELD(element, move_x, move_y) ||
5098                SPRING_CAN_ENTER_FIELD(element, x, y + 1))
5099         MovDir[x][y] = MV_NONE;
5100     }
5101 #else
5102     if (MovDir[x][y] & MV_HORIZONTAL &&
5103         (!SPRING_CAN_ENTER_FIELD(element, move_x, move_y) ||
5104          SPRING_CAN_ENTER_FIELD(element, x, y + 1)))
5105       MovDir[x][y] = MV_NONE;
5106 #endif
5107
5108     MovDelay[x][y] = 0;
5109   }
5110   else if (element == EL_ROBOT ||
5111            element == EL_SATELLITE ||
5112            element == EL_PENGUIN ||
5113            element == EL_EMC_ANDROID)
5114   {
5115     int attr_x = -1, attr_y = -1;
5116
5117     if (AllPlayersGone)
5118     {
5119       attr_x = ExitX;
5120       attr_y = ExitY;
5121     }
5122     else
5123     {
5124       int i;
5125
5126       for (i = 0; i < MAX_PLAYERS; i++)
5127       {
5128         struct PlayerInfo *player = &stored_player[i];
5129         int jx = player->jx, jy = player->jy;
5130
5131         if (!player->active)
5132           continue;
5133
5134         if (attr_x == -1 ||
5135             ABS(jx - x) + ABS(jy - y) < ABS(attr_x - x) + ABS(attr_y - y))
5136         {
5137           attr_x = jx;
5138           attr_y = jy;
5139         }
5140       }
5141     }
5142
5143     if (element == EL_ROBOT && ZX >= 0 && ZY >= 0 &&
5144         (Feld[ZX][ZY] == EL_ROBOT_WHEEL_ACTIVE ||
5145          game.engine_version < VERSION_IDENT(3,1,0,0)))
5146     {
5147       attr_x = ZX;
5148       attr_y = ZY;
5149     }
5150
5151     if (element == EL_PENGUIN)
5152     {
5153       int i;
5154       static int xy[4][2] =
5155       {
5156         { 0, -1 },
5157         { -1, 0 },
5158         { +1, 0 },
5159         { 0, +1 }
5160       };
5161
5162       for (i = 0; i < NUM_DIRECTIONS; i++)
5163       {
5164         int ex = x + xy[i][0];
5165         int ey = y + xy[i][1];
5166
5167         if (IN_LEV_FIELD(ex, ey) && Feld[ex][ey] == EL_EXIT_OPEN)
5168         {
5169           attr_x = ex;
5170           attr_y = ey;
5171           break;
5172         }
5173       }
5174     }
5175
5176     MovDir[x][y] = MV_NONE;
5177     if (attr_x < x)
5178       MovDir[x][y] |= (AllPlayersGone ? MV_RIGHT : MV_LEFT);
5179     else if (attr_x > x)
5180       MovDir[x][y] |= (AllPlayersGone ? MV_LEFT : MV_RIGHT);
5181     if (attr_y < y)
5182       MovDir[x][y] |= (AllPlayersGone ? MV_DOWN : MV_UP);
5183     else if (attr_y > y)
5184       MovDir[x][y] |= (AllPlayersGone ? MV_UP : MV_DOWN);
5185
5186     if (element == EL_ROBOT)
5187     {
5188       int newx, newy;
5189
5190       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
5191         MovDir[x][y] &= (RND(2) ? MV_HORIZONTAL : MV_VERTICAL);
5192       Moving2Blocked(x, y, &newx, &newy);
5193
5194       if (IN_LEV_FIELD(newx, newy) && IS_FREE_OR_PLAYER(newx, newy))
5195         MovDelay[x][y] = 8 + 8 * !RND(3);
5196       else
5197         MovDelay[x][y] = 16;
5198     }
5199     else if (element == EL_PENGUIN)
5200     {
5201       int newx, newy;
5202
5203       MovDelay[x][y] = 1;
5204
5205       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
5206       {
5207         boolean first_horiz = RND(2);
5208         int new_move_dir = MovDir[x][y];
5209
5210         MovDir[x][y] =
5211           new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
5212         Moving2Blocked(x, y, &newx, &newy);
5213
5214         if (PENGUIN_CAN_ENTER_FIELD(element, newx, newy))
5215           return;
5216
5217         MovDir[x][y] =
5218           new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
5219         Moving2Blocked(x, y, &newx, &newy);
5220
5221         if (PENGUIN_CAN_ENTER_FIELD(element, newx, newy))
5222           return;
5223
5224         MovDir[x][y] = old_move_dir;
5225         return;
5226       }
5227     }
5228     else if (element == EL_SATELLITE)
5229     {
5230       int newx, newy;
5231
5232       MovDelay[x][y] = 1;
5233
5234       if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
5235       {
5236         boolean first_horiz = RND(2);
5237         int new_move_dir = MovDir[x][y];
5238
5239         MovDir[x][y] =
5240           new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
5241         Moving2Blocked(x, y, &newx, &newy);
5242
5243         if (SATELLITE_CAN_ENTER_FIELD(newx, newy))
5244           return;
5245
5246         MovDir[x][y] =
5247           new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
5248         Moving2Blocked(x, y, &newx, &newy);
5249
5250         if (SATELLITE_CAN_ENTER_FIELD(newx, newy))
5251           return;
5252
5253         MovDir[x][y] = old_move_dir;
5254         return;
5255       }
5256     }
5257     else if (element == EL_EMC_ANDROID)
5258     {
5259       static int check_pos[16] =
5260       {
5261         -1,             /*  0 => (invalid)          */
5262         7,              /*  1 => MV_LEFT            */
5263         3,              /*  2 => MV_RIGHT           */
5264         -1,             /*  3 => (invalid)          */
5265         1,              /*  4 =>            MV_UP   */
5266         0,              /*  5 => MV_LEFT  | MV_UP   */
5267         2,              /*  6 => MV_RIGHT | MV_UP   */
5268         -1,             /*  7 => (invalid)          */
5269         5,              /*  8 =>            MV_DOWN */
5270         6,              /*  9 => MV_LEFT  | MV_DOWN */
5271         4,              /* 10 => MV_RIGHT | MV_DOWN */
5272         -1,             /* 11 => (invalid)          */
5273         -1,             /* 12 => (invalid)          */
5274         -1,             /* 13 => (invalid)          */
5275         -1,             /* 14 => (invalid)          */
5276         -1,             /* 15 => (invalid)          */
5277       };
5278       static struct
5279       {
5280         int dx, dy;
5281         int dir;
5282       } check_xy[8] =
5283       {
5284         { -1, -1,       MV_LEFT  | MV_UP   },
5285         {  0, -1,                  MV_UP   },
5286         { +1, -1,       MV_RIGHT | MV_UP   },
5287         { +1,  0,       MV_RIGHT           },
5288         { +1, +1,       MV_RIGHT | MV_DOWN },
5289         {  0, +1,                  MV_DOWN },
5290         { -1, +1,       MV_LEFT  | MV_DOWN },
5291         { -1,  0,       MV_LEFT            },
5292       };
5293       int start_pos, check_order;
5294       boolean can_clone = FALSE;
5295       int i;
5296
5297       /* check if there is any free field around current position */
5298       for (i = 0; i < 8; i++)
5299       {
5300         int newx = x + check_xy[i].dx;
5301         int newy = y + check_xy[i].dy;
5302
5303         if (IN_LEV_FIELD_AND_IS_FREE(newx, newy))
5304         {
5305           can_clone = TRUE;
5306
5307           break;
5308         }
5309       }
5310
5311       if (can_clone)            /* randomly find an element to clone */
5312       {
5313         can_clone = FALSE;
5314
5315         start_pos = check_pos[RND(8)];
5316         check_order = (RND(2) ? -1 : +1);
5317
5318         for (i = 0; i < 8; i++)
5319         {
5320           int pos_raw = start_pos + i * check_order;
5321           int pos = (pos_raw + 8) % 8;
5322           int newx = x + check_xy[pos].dx;
5323           int newy = y + check_xy[pos].dy;
5324
5325           if (ANDROID_CAN_CLONE_FIELD(newx, newy))
5326           {
5327             element_info[element].move_leave_type = LEAVE_TYPE_LIMITED;
5328             element_info[element].move_leave_element = EL_TRIGGER_ELEMENT;
5329
5330             Store[x][y] = Feld[newx][newy];
5331
5332             can_clone = TRUE;
5333
5334             break;
5335           }
5336         }
5337       }
5338
5339       if (can_clone)            /* randomly find a direction to move */
5340       {
5341         can_clone = FALSE;
5342
5343         start_pos = check_pos[RND(8)];
5344         check_order = (RND(2) ? -1 : +1);
5345
5346         for (i = 0; i < 8; i++)
5347         {
5348           int pos_raw = start_pos + i * check_order;
5349           int pos = (pos_raw + 8) % 8;
5350           int newx = x + check_xy[pos].dx;
5351           int newy = y + check_xy[pos].dy;
5352           int new_move_dir = check_xy[pos].dir;
5353
5354           if (IN_LEV_FIELD_AND_IS_FREE(newx, newy))
5355           {
5356             MovDir[x][y] = new_move_dir;
5357             MovDelay[x][y] = level.android_clone_time * 8 + 1;
5358
5359             can_clone = TRUE;
5360
5361             break;
5362           }
5363         }
5364       }
5365
5366       if (can_clone)            /* cloning and moving successful */
5367         return;
5368
5369       /* cannot clone -- try to move towards player */
5370
5371       start_pos = check_pos[MovDir[x][y] & 0x0f];
5372       check_order = (RND(2) ? -1 : +1);
5373
5374       for (i = 0; i < 3; i++)
5375       {
5376         /* first check start_pos, then previous/next or (next/previous) pos */
5377         int pos_raw = start_pos + (i < 2 ? i : -1) * check_order;
5378         int pos = (pos_raw + 8) % 8;
5379         int newx = x + check_xy[pos].dx;
5380         int newy = y + check_xy[pos].dy;
5381         int new_move_dir = check_xy[pos].dir;
5382
5383         if (IS_PLAYER(newx, newy))
5384           break;
5385
5386         if (ANDROID_CAN_ENTER_FIELD(element, newx, newy))
5387         {
5388           MovDir[x][y] = new_move_dir;
5389           MovDelay[x][y] = level.android_move_time * 8 + 1;
5390
5391           break;
5392         }
5393       }
5394     }
5395   }
5396   else if (move_pattern == MV_TURNING_LEFT ||
5397            move_pattern == MV_TURNING_RIGHT ||
5398            move_pattern == MV_TURNING_LEFT_RIGHT ||
5399            move_pattern == MV_TURNING_RIGHT_LEFT ||
5400            move_pattern == MV_TURNING_RANDOM ||
5401            move_pattern == MV_ALL_DIRECTIONS)
5402   {
5403     boolean can_turn_left =
5404       CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, left_x, left_y);
5405     boolean can_turn_right =
5406       CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, right_x,right_y);
5407
5408     if (element_info[element].move_stepsize == 0)       /* "not moving" */
5409       return;
5410
5411     if (move_pattern == MV_TURNING_LEFT)
5412       MovDir[x][y] = left_dir;
5413     else if (move_pattern == MV_TURNING_RIGHT)
5414       MovDir[x][y] = right_dir;
5415     else if (move_pattern == MV_TURNING_LEFT_RIGHT)
5416       MovDir[x][y] = (can_turn_left || !can_turn_right ? left_dir : right_dir);
5417     else if (move_pattern == MV_TURNING_RIGHT_LEFT)
5418       MovDir[x][y] = (can_turn_right || !can_turn_left ? right_dir : left_dir);
5419     else if (move_pattern == MV_TURNING_RANDOM)
5420       MovDir[x][y] = (can_turn_left && !can_turn_right ? left_dir :
5421                       can_turn_right && !can_turn_left ? right_dir :
5422                       RND(2) ? left_dir : right_dir);
5423     else if (can_turn_left && can_turn_right)
5424       MovDir[x][y] = (RND(3) ? (RND(2) ? left_dir : right_dir) : back_dir);
5425     else if (can_turn_left)
5426       MovDir[x][y] = (RND(2) ? left_dir : back_dir);
5427     else if (can_turn_right)
5428       MovDir[x][y] = (RND(2) ? right_dir : back_dir);
5429     else
5430       MovDir[x][y] = back_dir;
5431
5432     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
5433   }
5434   else if (move_pattern == MV_HORIZONTAL ||
5435            move_pattern == MV_VERTICAL)
5436   {
5437     if (move_pattern & old_move_dir)
5438       MovDir[x][y] = back_dir;
5439     else if (move_pattern == MV_HORIZONTAL)
5440       MovDir[x][y] = (RND(2) ? MV_LEFT : MV_RIGHT);
5441     else if (move_pattern == MV_VERTICAL)
5442       MovDir[x][y] = (RND(2) ? MV_UP : MV_DOWN);
5443
5444     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
5445   }
5446   else if (move_pattern & MV_ANY_DIRECTION)
5447   {
5448     MovDir[x][y] = move_pattern;
5449     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
5450   }
5451   else if (move_pattern & MV_WIND_DIRECTION)
5452   {
5453     MovDir[x][y] = game.wind_direction;
5454     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
5455   }
5456   else if (move_pattern == MV_ALONG_LEFT_SIDE)
5457   {
5458     if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, left_x, left_y))
5459       MovDir[x][y] = left_dir;
5460     else if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
5461       MovDir[x][y] = right_dir;
5462
5463     if (MovDir[x][y] != old_move_dir)
5464       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
5465   }
5466   else if (move_pattern == MV_ALONG_RIGHT_SIDE)
5467   {
5468     if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, right_x, right_y))
5469       MovDir[x][y] = right_dir;
5470     else if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
5471       MovDir[x][y] = left_dir;
5472
5473     if (MovDir[x][y] != old_move_dir)
5474       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
5475   }
5476   else if (move_pattern == MV_TOWARDS_PLAYER ||
5477            move_pattern == MV_AWAY_FROM_PLAYER)
5478   {
5479     int attr_x = -1, attr_y = -1;
5480     int newx, newy;
5481     boolean move_away = (move_pattern == MV_AWAY_FROM_PLAYER);
5482
5483     if (AllPlayersGone)
5484     {
5485       attr_x = ExitX;
5486       attr_y = ExitY;
5487     }
5488     else
5489     {
5490       int i;
5491
5492       for (i = 0; i < MAX_PLAYERS; i++)
5493       {
5494         struct PlayerInfo *player = &stored_player[i];
5495         int jx = player->jx, jy = player->jy;
5496
5497         if (!player->active)
5498           continue;
5499
5500         if (attr_x == -1 ||
5501             ABS(jx - x) + ABS(jy - y) < ABS(attr_x - x) + ABS(attr_y - y))
5502         {
5503           attr_x = jx;
5504           attr_y = jy;
5505         }
5506       }
5507     }
5508
5509     MovDir[x][y] = MV_NONE;
5510     if (attr_x < x)
5511       MovDir[x][y] |= (move_away ? MV_RIGHT : MV_LEFT);
5512     else if (attr_x > x)
5513       MovDir[x][y] |= (move_away ? MV_LEFT : MV_RIGHT);
5514     if (attr_y < y)
5515       MovDir[x][y] |= (move_away ? MV_DOWN : MV_UP);
5516     else if (attr_y > y)
5517       MovDir[x][y] |= (move_away ? MV_UP : MV_DOWN);
5518
5519     MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
5520
5521     if (MovDir[x][y] & MV_HORIZONTAL && MovDir[x][y] & MV_VERTICAL)
5522     {
5523       boolean first_horiz = RND(2);
5524       int new_move_dir = MovDir[x][y];
5525
5526       if (element_info[element].move_stepsize == 0)     /* "not moving" */
5527       {
5528         first_horiz = (ABS(attr_x - x) >= ABS(attr_y - y));
5529         MovDir[x][y] &= (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
5530
5531         return;
5532       }
5533
5534       MovDir[x][y] =
5535         new_move_dir & (first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
5536       Moving2Blocked(x, y, &newx, &newy);
5537
5538       if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
5539         return;
5540
5541       MovDir[x][y] =
5542         new_move_dir & (!first_horiz ? MV_HORIZONTAL : MV_VERTICAL);
5543       Moving2Blocked(x, y, &newx, &newy);
5544
5545       if (CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
5546         return;
5547
5548       MovDir[x][y] = old_move_dir;
5549     }
5550   }
5551   else if (move_pattern == MV_WHEN_PUSHED ||
5552            move_pattern == MV_WHEN_DROPPED)
5553   {
5554     if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, move_x, move_y))
5555       MovDir[x][y] = MV_NONE;
5556
5557     MovDelay[x][y] = 0;
5558   }
5559   else if (move_pattern & MV_MAZE_RUNNER_STYLE)
5560   {
5561     static int test_xy[7][2] =
5562     {
5563       { 0, -1 },
5564       { -1, 0 },
5565       { +1, 0 },
5566       { 0, +1 },
5567       { 0, -1 },
5568       { -1, 0 },
5569       { +1, 0 },
5570     };
5571     static int test_dir[7] =
5572     {
5573       MV_UP,
5574       MV_LEFT,
5575       MV_RIGHT,
5576       MV_DOWN,
5577       MV_UP,
5578       MV_LEFT,
5579       MV_RIGHT,
5580     };
5581     boolean hunter_mode = (move_pattern == MV_MAZE_HUNTER);
5582     int move_preference = -1000000;     /* start with very low preference */
5583     int new_move_dir = MV_NONE;
5584     int start_test = RND(4);
5585     int i;
5586
5587     for (i = 0; i < NUM_DIRECTIONS; i++)
5588     {
5589       int move_dir = test_dir[start_test + i];
5590       int move_dir_preference;
5591
5592       xx = x + test_xy[start_test + i][0];
5593       yy = y + test_xy[start_test + i][1];
5594
5595       if (hunter_mode && IN_LEV_FIELD(xx, yy) &&
5596           (IS_PLAYER(xx, yy) || Feld[xx][yy] == EL_PLAYER_IS_LEAVING))
5597       {
5598         new_move_dir = move_dir;
5599
5600         break;
5601       }
5602
5603       if (!CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, xx, yy))
5604         continue;
5605
5606       move_dir_preference = -1 * RunnerVisit[xx][yy];
5607       if (hunter_mode && PlayerVisit[xx][yy] > 0)
5608         move_dir_preference = PlayerVisit[xx][yy];
5609
5610       if (move_dir_preference > move_preference)
5611       {
5612         /* prefer field that has not been visited for the longest time */
5613         move_preference = move_dir_preference;
5614         new_move_dir = move_dir;
5615       }
5616       else if (move_dir_preference == move_preference &&
5617                move_dir == old_move_dir)
5618       {
5619         /* prefer last direction when all directions are preferred equally */
5620         move_preference = move_dir_preference;
5621         new_move_dir = move_dir;
5622       }
5623     }
5624
5625     MovDir[x][y] = new_move_dir;
5626     if (old_move_dir != new_move_dir)
5627       MovDelay[x][y] = GET_NEW_MOVE_DELAY(element);
5628   }
5629 }
5630
5631 static void TurnRound(int x, int y)
5632 {
5633   int direction = MovDir[x][y];
5634 #if 1
5635   int element, graphic;
5636 #endif
5637
5638   TurnRoundExt(x, y);
5639
5640   GfxDir[x][y] = MovDir[x][y];
5641
5642   if (direction != MovDir[x][y])
5643     GfxFrame[x][y] = 0;
5644
5645   if (MovDelay[x][y])
5646     GfxAction[x][y] = ACTION_TURNING_FROM_LEFT + MV_DIR_TO_BIT(direction);
5647
5648 #if 1
5649   element = Feld[x][y];
5650   graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
5651
5652   if (graphic_info[graphic].anim_global_sync)
5653     GfxFrame[x][y] = FrameCounter;
5654   else if (ANIM_MODE(graphic) == ANIM_CE_VALUE)
5655     GfxFrame[x][y] = CustomValue[x][y];
5656   else if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
5657     GfxFrame[x][y] = element_info[element].collect_score;
5658 #endif
5659 }
5660
5661 static boolean JustBeingPushed(int x, int y)
5662 {
5663   int i;
5664
5665   for (i = 0; i < MAX_PLAYERS; i++)
5666   {
5667     struct PlayerInfo *player = &stored_player[i];
5668
5669     if (player->active && player->is_pushing && player->MovPos)
5670     {
5671       int next_jx = player->jx + (player->jx - player->last_jx);
5672       int next_jy = player->jy + (player->jy - player->last_jy);
5673
5674       if (x == next_jx && y == next_jy)
5675         return TRUE;
5676     }
5677   }
5678
5679   return FALSE;
5680 }
5681
5682 void StartMoving(int x, int y)
5683 {
5684   boolean started_moving = FALSE;       /* some elements can fall _and_ move */
5685   int element = Feld[x][y];
5686
5687   if (Stop[x][y])
5688     return;
5689
5690   if (MovDelay[x][y] == 0)
5691     GfxAction[x][y] = ACTION_DEFAULT;
5692
5693   if (CAN_FALL(element) && y < lev_fieldy - 1)
5694   {
5695     if ((x > 0              && IS_PLAYER(x - 1, y)) ||
5696         (x < lev_fieldx - 1 && IS_PLAYER(x + 1, y)))
5697       if (JustBeingPushed(x, y))
5698         return;
5699
5700     if (element == EL_QUICKSAND_FULL)
5701     {
5702       if (IS_FREE(x, y + 1))
5703       {
5704         InitMovingField(x, y, MV_DOWN);
5705         started_moving = TRUE;
5706
5707         Feld[x][y] = EL_QUICKSAND_EMPTYING;
5708         Store[x][y] = EL_ROCK;
5709
5710         PlayLevelSoundAction(x, y, ACTION_EMPTYING);
5711       }
5712       else if (Feld[x][y + 1] == EL_QUICKSAND_EMPTY)
5713       {
5714         if (!MovDelay[x][y])
5715           MovDelay[x][y] = TILEY + 1;
5716
5717         if (MovDelay[x][y])
5718         {
5719           MovDelay[x][y]--;
5720           if (MovDelay[x][y])
5721             return;
5722         }
5723
5724         Feld[x][y] = EL_QUICKSAND_EMPTY;
5725         Feld[x][y + 1] = EL_QUICKSAND_FULL;
5726         Store[x][y + 1] = Store[x][y];
5727         Store[x][y] = 0;
5728
5729         PlayLevelSoundAction(x, y, ACTION_FILLING);
5730       }
5731     }
5732     else if ((element == EL_ROCK || element == EL_BD_ROCK) &&
5733              Feld[x][y + 1] == EL_QUICKSAND_EMPTY)
5734     {
5735       InitMovingField(x, y, MV_DOWN);
5736       started_moving = TRUE;
5737
5738       Feld[x][y] = EL_QUICKSAND_FILLING;
5739       Store[x][y] = element;
5740
5741       PlayLevelSoundAction(x, y, ACTION_FILLING);
5742     }
5743     else if (element == EL_MAGIC_WALL_FULL)
5744     {
5745       if (IS_FREE(x, y + 1))
5746       {
5747         InitMovingField(x, y, MV_DOWN);
5748         started_moving = TRUE;
5749
5750         Feld[x][y] = EL_MAGIC_WALL_EMPTYING;
5751         Store[x][y] = EL_CHANGED(Store[x][y]);
5752       }
5753       else if (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE)
5754       {
5755         if (!MovDelay[x][y])
5756           MovDelay[x][y] = TILEY/4 + 1;
5757
5758         if (MovDelay[x][y])
5759         {
5760           MovDelay[x][y]--;
5761           if (MovDelay[x][y])
5762             return;
5763         }
5764
5765         Feld[x][y] = EL_MAGIC_WALL_ACTIVE;
5766         Feld[x][y + 1] = EL_MAGIC_WALL_FULL;
5767         Store[x][y + 1] = EL_CHANGED(Store[x][y]);
5768         Store[x][y] = 0;
5769       }
5770     }
5771     else if (element == EL_BD_MAGIC_WALL_FULL)
5772     {
5773       if (IS_FREE(x, y + 1))
5774       {
5775         InitMovingField(x, y, MV_DOWN);
5776         started_moving = TRUE;
5777
5778         Feld[x][y] = EL_BD_MAGIC_WALL_EMPTYING;
5779         Store[x][y] = EL_CHANGED2(Store[x][y]);
5780       }
5781       else if (Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE)
5782       {
5783         if (!MovDelay[x][y])
5784           MovDelay[x][y] = TILEY/4 + 1;
5785
5786         if (MovDelay[x][y])
5787         {
5788           MovDelay[x][y]--;
5789           if (MovDelay[x][y])
5790             return;
5791         }
5792
5793         Feld[x][y] = EL_BD_MAGIC_WALL_ACTIVE;
5794         Feld[x][y + 1] = EL_BD_MAGIC_WALL_FULL;
5795         Store[x][y + 1] = EL_CHANGED2(Store[x][y]);
5796         Store[x][y] = 0;
5797       }
5798     }
5799     else if (CAN_PASS_MAGIC_WALL(element) &&
5800              (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ||
5801               Feld[x][y + 1] == EL_BD_MAGIC_WALL_ACTIVE))
5802     {
5803       InitMovingField(x, y, MV_DOWN);
5804       started_moving = TRUE;
5805
5806       Feld[x][y] =
5807         (Feld[x][y + 1] == EL_MAGIC_WALL_ACTIVE ? EL_MAGIC_WALL_FILLING :
5808          EL_BD_MAGIC_WALL_FILLING);
5809       Store[x][y] = element;
5810     }
5811     else if (CAN_FALL(element) && Feld[x][y + 1] == EL_ACID)
5812     {
5813       SplashAcid(x, y + 1);
5814
5815       InitMovingField(x, y, MV_DOWN);
5816       started_moving = TRUE;
5817
5818       Store[x][y] = EL_ACID;
5819     }
5820     else if ((game.engine_version >= VERSION_IDENT(3,1,0,0) &&
5821               CheckCollision[x][y] && !IS_FREE(x, y + 1)) ||
5822
5823              (game.engine_version >= VERSION_IDENT(3,0,7,0) &&
5824               CAN_FALL(element) && WasJustFalling[x][y] &&
5825               (Feld[x][y + 1] == EL_BLOCKED || IS_PLAYER(x, y + 1))) ||
5826
5827              (game.engine_version < VERSION_IDENT(2,2,0,7) &&
5828               CAN_FALL(element) && WasJustMoving[x][y] && !Pushed[x][y + 1] &&
5829               (Feld[x][y + 1] == EL_BLOCKED)))
5830     {
5831       /* this is needed for a special case not covered by calling "Impact()"
5832          from "ContinueMoving()": if an element moves to a tile directly below
5833          another element which was just falling on that tile (which was empty
5834          in the previous frame), the falling element above would just stop
5835          instead of smashing the element below (in previous version, the above
5836          element was just checked for "moving" instead of "falling", resulting
5837          in incorrect smashes caused by horizontal movement of the above
5838          element; also, the case of the player being the element to smash was
5839          simply not covered here... :-/ ) */
5840
5841       CheckCollision[x][y] = 0;
5842
5843       Impact(x, y);
5844     }
5845     else if (IS_FREE(x, y + 1) && element == EL_SPRING && level.use_spring_bug)
5846     {
5847       if (MovDir[x][y] == MV_NONE)
5848       {
5849         InitMovingField(x, y, MV_DOWN);
5850         started_moving = TRUE;
5851       }
5852     }
5853     else if (IS_FREE(x, y + 1) || Feld[x][y + 1] == EL_DIAMOND_BREAKING)
5854     {
5855       if (WasJustFalling[x][y]) /* prevent animation from being restarted */
5856         MovDir[x][y] = MV_DOWN;
5857
5858       InitMovingField(x, y, MV_DOWN);
5859       started_moving = TRUE;
5860     }
5861     else if (element == EL_AMOEBA_DROP)
5862     {
5863       Feld[x][y] = EL_AMOEBA_GROWING;
5864       Store[x][y] = EL_AMOEBA_WET;
5865     }
5866     else if (((IS_SLIPPERY(Feld[x][y + 1]) && !IS_PLAYER(x, y + 1)) ||
5867               (IS_EM_SLIPPERY_WALL(Feld[x][y + 1]) && IS_GEM(element))) &&
5868              !IS_FALLING(x, y + 1) && !WasJustMoving[x][y + 1] &&
5869              element != EL_DX_SUPABOMB && element != EL_SP_DISK_ORANGE)
5870     {
5871       boolean can_fall_left  = (x > 0 && IS_FREE(x - 1, y) &&
5872                                 (IS_FREE(x - 1, y + 1) ||
5873                                  Feld[x - 1][y + 1] == EL_ACID));
5874       boolean can_fall_right = (x < lev_fieldx - 1 && IS_FREE(x + 1, y) &&
5875                                 (IS_FREE(x + 1, y + 1) ||
5876                                  Feld[x + 1][y + 1] == EL_ACID));
5877       boolean can_fall_any  = (can_fall_left || can_fall_right);
5878       boolean can_fall_both = (can_fall_left && can_fall_right);
5879       int slippery_type = element_info[Feld[x][y + 1]].slippery_type;
5880
5881 #if USE_NEW_ALL_SLIPPERY
5882       if (can_fall_any && slippery_type != SLIPPERY_ANY_RANDOM)
5883       {
5884         if (slippery_type == SLIPPERY_ANY_LEFT_RIGHT && can_fall_both)
5885           can_fall_right = FALSE;
5886         else if (slippery_type == SLIPPERY_ANY_RIGHT_LEFT && can_fall_both)
5887           can_fall_left = FALSE;
5888         else if (slippery_type == SLIPPERY_ONLY_LEFT)
5889           can_fall_right = FALSE;
5890         else if (slippery_type == SLIPPERY_ONLY_RIGHT)
5891           can_fall_left = FALSE;
5892
5893         can_fall_any  = (can_fall_left || can_fall_right);
5894         can_fall_both = FALSE;
5895       }
5896 #else
5897       if (can_fall_any && IS_CUSTOM_ELEMENT(Feld[x][y + 1]))
5898       {
5899         if (slippery_type == SLIPPERY_ONLY_LEFT)
5900           can_fall_right = FALSE;
5901         else if (slippery_type == SLIPPERY_ONLY_RIGHT)
5902           can_fall_left = FALSE;
5903         else if (slippery_type == SLIPPERY_ANY_LEFT_RIGHT && can_fall_both)
5904           can_fall_right = FALSE;
5905         else if (slippery_type == SLIPPERY_ANY_RIGHT_LEFT && can_fall_both)
5906           can_fall_left = FALSE;
5907
5908         can_fall_any  = (can_fall_left || can_fall_right);
5909         can_fall_both = (can_fall_left && can_fall_right);
5910       }
5911 #endif
5912
5913 #if USE_NEW_ALL_SLIPPERY
5914 #else
5915 #if USE_NEW_SP_SLIPPERY
5916       /* !!! better use the same properties as for custom elements here !!! */
5917       else if (game.engine_version >= VERSION_IDENT(3,1,1,0) &&
5918                can_fall_both && IS_SP_ELEMENT(Feld[x][y + 1]))
5919       {
5920         can_fall_right = FALSE;         /* slip down on left side */
5921         can_fall_both = FALSE;
5922       }
5923 #endif
5924 #endif
5925
5926 #if USE_NEW_ALL_SLIPPERY
5927       if (can_fall_both)
5928       {
5929         if (element == EL_BD_ROCK || element == EL_BD_DIAMOND)
5930           can_fall_right = FALSE;       /* slip down on left side */
5931         else
5932           can_fall_left = !(can_fall_right = RND(2));
5933
5934         can_fall_both = FALSE;
5935       }
5936 #else
5937       if (can_fall_both)
5938       {
5939         if (game.emulation == EMU_BOULDERDASH ||
5940             element == EL_BD_ROCK || element == EL_BD_DIAMOND)
5941           can_fall_right = FALSE;       /* slip down on left side */
5942         else
5943           can_fall_left = !(can_fall_right = RND(2));
5944
5945         can_fall_both = FALSE;
5946       }
5947 #endif
5948
5949       if (can_fall_any)
5950       {
5951         /* if not determined otherwise, prefer left side for slipping down */
5952         InitMovingField(x, y, can_fall_left ? MV_LEFT : MV_RIGHT);
5953         started_moving = TRUE;
5954       }
5955     }
5956 #if 0
5957     else if (IS_BELT_ACTIVE(Feld[x][y + 1]) && !CAN_MOVE(element))
5958 #else
5959     else if (IS_BELT_ACTIVE(Feld[x][y + 1]))
5960 #endif
5961     {
5962       boolean left_is_free  = (x > 0 && IS_FREE(x - 1, y));
5963       boolean right_is_free = (x < lev_fieldx - 1 && IS_FREE(x + 1, y));
5964       int belt_nr = getBeltNrFromBeltActiveElement(Feld[x][y + 1]);
5965       int belt_dir = game.belt_dir[belt_nr];
5966
5967       if ((belt_dir == MV_LEFT  && left_is_free) ||
5968           (belt_dir == MV_RIGHT && right_is_free))
5969       {
5970         int nextx = (belt_dir == MV_LEFT ? x - 1 : x + 1);
5971
5972         InitMovingField(x, y, belt_dir);
5973         started_moving = TRUE;
5974
5975         Pushed[x][y] = TRUE;
5976         Pushed[nextx][y] = TRUE;
5977
5978         GfxAction[x][y] = ACTION_DEFAULT;
5979       }
5980       else
5981       {
5982         MovDir[x][y] = 0;       /* if element was moving, stop it */
5983       }
5984     }
5985   }
5986
5987   /* not "else if" because of elements that can fall and move (EL_SPRING) */
5988 #if 0
5989   if (CAN_MOVE(element) && !started_moving && MovDir[x][y] != MV_NONE)
5990 #else
5991   if (CAN_MOVE(element) && !started_moving)
5992 #endif
5993   {
5994     int move_pattern = element_info[element].move_pattern;
5995     int newx, newy;
5996
5997 #if 0
5998 #if DEBUG
5999     if (MovDir[x][y] == MV_NONE)
6000     {
6001       printf("StartMoving(): %d,%d: element %d ['%s'] not moving\n",
6002              x, y, element, element_info[element].token_name);
6003       printf("StartMoving(): This should never happen!\n");
6004     }
6005 #endif
6006 #endif
6007
6008     Moving2Blocked(x, y, &newx, &newy);
6009
6010     if (IS_PUSHABLE(element) && JustBeingPushed(x, y))
6011       return;
6012
6013     if (game.engine_version >= VERSION_IDENT(3,1,0,0) &&
6014         CheckCollision[x][y] && !IN_LEV_FIELD_AND_IS_FREE(newx, newy))
6015     {
6016       WasJustMoving[x][y] = 0;
6017       CheckCollision[x][y] = 0;
6018
6019       TestIfElementHitsCustomElement(x, y, MovDir[x][y]);
6020
6021       if (Feld[x][y] != element)        /* element has changed */
6022         return;
6023     }
6024
6025     if (!MovDelay[x][y])        /* start new movement phase */
6026     {
6027       /* all objects that can change their move direction after each step
6028          (YAMYAM, DARK_YAMYAM and PACMAN go straight until they hit a wall */
6029
6030       if (element != EL_YAMYAM &&
6031           element != EL_DARK_YAMYAM &&
6032           element != EL_PACMAN &&
6033           !(move_pattern & MV_ANY_DIRECTION) &&
6034           move_pattern != MV_TURNING_LEFT &&
6035           move_pattern != MV_TURNING_RIGHT &&
6036           move_pattern != MV_TURNING_LEFT_RIGHT &&
6037           move_pattern != MV_TURNING_RIGHT_LEFT &&
6038           move_pattern != MV_TURNING_RANDOM)
6039       {
6040         TurnRound(x, y);
6041
6042         if (MovDelay[x][y] && (element == EL_BUG ||
6043                                element == EL_SPACESHIP ||
6044                                element == EL_SP_SNIKSNAK ||
6045                                element == EL_SP_ELECTRON ||
6046                                element == EL_MOLE))
6047           DrawLevelField(x, y);
6048       }
6049     }
6050
6051     if (MovDelay[x][y])         /* wait some time before next movement */
6052     {
6053       MovDelay[x][y]--;
6054
6055       if (element == EL_ROBOT ||
6056           element == EL_YAMYAM ||
6057           element == EL_DARK_YAMYAM)
6058       {
6059         DrawLevelElementAnimationIfNeeded(x, y, element);
6060         PlayLevelSoundAction(x, y, ACTION_WAITING);
6061       }
6062       else if (element == EL_SP_ELECTRON)
6063         DrawLevelElementAnimationIfNeeded(x, y, element);
6064       else if (element == EL_DRAGON)
6065       {
6066         int i;
6067         int dir = MovDir[x][y];
6068         int dx = (dir == MV_LEFT ? -1 : dir == MV_RIGHT ? +1 : 0);
6069         int dy = (dir == MV_UP   ? -1 : dir == MV_DOWN  ? +1 : 0);
6070         int graphic = (dir == MV_LEFT   ? IMG_FLAMES_1_LEFT :
6071                        dir == MV_RIGHT  ? IMG_FLAMES_1_RIGHT :
6072                        dir == MV_UP     ? IMG_FLAMES_1_UP :
6073                        dir == MV_DOWN   ? IMG_FLAMES_1_DOWN : IMG_EMPTY);
6074         int frame = getGraphicAnimationFrame(graphic, GfxFrame[x][y]);
6075
6076         GfxAction[x][y] = ACTION_ATTACKING;
6077
6078         if (IS_PLAYER(x, y))
6079           DrawPlayerField(x, y);
6080         else
6081           DrawLevelField(x, y);
6082
6083         PlayLevelSoundActionIfLoop(x, y, ACTION_ATTACKING);
6084
6085         for (i = 1; i <= 3; i++)
6086         {
6087           int xx = x + i * dx;
6088           int yy = y + i * dy;
6089           int sx = SCREENX(xx);
6090           int sy = SCREENY(yy);
6091           int flame_graphic = graphic + (i - 1);
6092
6093           if (!IN_LEV_FIELD(xx, yy) || IS_DRAGONFIRE_PROOF(Feld[xx][yy]))
6094             break;
6095
6096           if (MovDelay[x][y])
6097           {
6098             int flamed = MovingOrBlocked2Element(xx, yy);
6099
6100             /* !!! */
6101 #if 0
6102             if (IS_CLASSIC_ENEMY(flamed) || CAN_EXPLODE_BY_DRAGONFIRE(flamed))
6103               Bang(xx, yy);
6104             else if (IS_MOVING(xx, yy) || IS_BLOCKED(xx, yy))
6105               RemoveMovingField(xx, yy);
6106             else
6107               RemoveField(xx, yy);
6108 #else
6109             if (IS_CLASSIC_ENEMY(flamed) || CAN_EXPLODE_BY_DRAGONFIRE(flamed))
6110               Bang(xx, yy);
6111             else
6112               RemoveMovingField(xx, yy);
6113 #endif
6114
6115             ChangeDelay[xx][yy] = 0;
6116
6117             Feld[xx][yy] = EL_FLAMES;
6118
6119             if (IN_SCR_FIELD(sx, sy))
6120             {
6121               DrawLevelFieldCrumbledSand(xx, yy);
6122               DrawGraphic(sx, sy, flame_graphic, frame);
6123             }
6124           }
6125           else
6126           {
6127             if (Feld[xx][yy] == EL_FLAMES)
6128               Feld[xx][yy] = EL_EMPTY;
6129             DrawLevelField(xx, yy);
6130           }
6131         }
6132       }
6133
6134       if (MovDelay[x][y])       /* element still has to wait some time */
6135       {
6136         PlayLevelSoundAction(x, y, ACTION_WAITING);
6137
6138         return;
6139       }
6140     }
6141
6142     /* now make next step */
6143
6144     Moving2Blocked(x, y, &newx, &newy); /* get next screen position */
6145
6146     if (DONT_COLLIDE_WITH(element) &&
6147         IN_LEV_FIELD(newx, newy) && IS_PLAYER(newx, newy) &&
6148         !PLAYER_ENEMY_PROTECTED(newx, newy))
6149     {
6150       TestIfBadThingRunsIntoPlayer(x, y, MovDir[x][y]);
6151
6152       return;
6153     }
6154
6155     else if (CAN_MOVE_INTO_ACID(element) &&
6156              IN_LEV_FIELD(newx, newy) && Feld[newx][newy] == EL_ACID &&
6157              !IS_MV_DIAGONAL(MovDir[x][y]) &&
6158              (MovDir[x][y] == MV_DOWN ||
6159               game.engine_version >= VERSION_IDENT(3,1,0,0)))
6160     {
6161       SplashAcid(newx, newy);
6162       Store[x][y] = EL_ACID;
6163     }
6164     else if (element == EL_PENGUIN && IN_LEV_FIELD(newx, newy))
6165     {
6166       if (Feld[newx][newy] == EL_EXIT_OPEN)
6167       {
6168         RemoveField(x, y);
6169         DrawLevelField(x, y);
6170
6171         PlayLevelSound(newx, newy, SND_PENGUIN_PASSING);
6172         if (IN_SCR_FIELD(SCREENX(newx), SCREENY(newy)))
6173           DrawGraphicThruMask(SCREENX(newx),SCREENY(newy), el2img(element), 0);
6174
6175         local_player->friends_still_needed--;
6176         if (!local_player->friends_still_needed &&
6177             !local_player->GameOver && AllPlayersGone)
6178           local_player->LevelSolved = local_player->GameOver = TRUE;
6179
6180         return;
6181       }
6182       else if (IS_FOOD_PENGUIN(Feld[newx][newy]))
6183       {
6184         if (DigField(local_player, x, y, newx, newy, 0,0, DF_DIG) == MP_MOVING)
6185           DrawLevelField(newx, newy);
6186         else
6187           GfxDir[x][y] = MovDir[x][y] = MV_NONE;
6188       }
6189       else if (!IS_FREE(newx, newy))
6190       {
6191         GfxAction[x][y] = ACTION_WAITING;
6192
6193         if (IS_PLAYER(x, y))
6194           DrawPlayerField(x, y);
6195         else
6196           DrawLevelField(x, y);
6197
6198         return;
6199       }
6200     }
6201     else if (element == EL_PIG && IN_LEV_FIELD(newx, newy))
6202     {
6203       if (IS_FOOD_PIG(Feld[newx][newy]))
6204       {
6205         if (IS_MOVING(newx, newy))
6206           RemoveMovingField(newx, newy);
6207         else
6208         {
6209           Feld[newx][newy] = EL_EMPTY;
6210           DrawLevelField(newx, newy);
6211         }
6212
6213         PlayLevelSound(x, y, SND_PIG_DIGGING);
6214       }
6215       else if (!IS_FREE(newx, newy))
6216       {
6217         if (IS_PLAYER(x, y))
6218           DrawPlayerField(x, y);
6219         else
6220           DrawLevelField(x, y);
6221
6222         return;
6223       }
6224     }
6225     else if (element == EL_EMC_ANDROID && IN_LEV_FIELD(newx, newy))
6226     {
6227       if (Store[x][y] != EL_EMPTY)
6228       {
6229         boolean can_clone = FALSE;
6230         int xx, yy;
6231
6232         /* check if element to clone is still there */
6233         for (yy = y - 1; yy <= y + 1; yy++) for (xx = x - 1; xx <= x + 1; xx++)
6234         {
6235           if (IN_LEV_FIELD(xx, yy) && Feld[xx][yy] == Store[x][y])
6236           {
6237             can_clone = TRUE;
6238
6239             break;
6240           }
6241         }
6242
6243         /* cannot clone or target field not free anymore -- do not clone */
6244         if (!can_clone || !ANDROID_CAN_ENTER_FIELD(element, newx, newy))
6245           Store[x][y] = EL_EMPTY;
6246       }
6247
6248       if (ANDROID_CAN_ENTER_FIELD(element, newx, newy))
6249       {
6250         if (IS_MV_DIAGONAL(MovDir[x][y]))
6251         {
6252           int diagonal_move_dir = MovDir[x][y];
6253           int stored = Store[x][y];
6254           int change_delay = 8;
6255           int graphic;
6256
6257           /* android is moving diagonally */
6258
6259           CreateField(x, y, EL_DIAGONAL_SHRINKING);
6260
6261           Store[x][y] = (stored == EL_ACID ? EL_EMPTY : stored);
6262           GfxElement[x][y] = EL_EMC_ANDROID;
6263           GfxAction[x][y] = ACTION_SHRINKING;
6264           GfxDir[x][y] = diagonal_move_dir;
6265           ChangeDelay[x][y] = change_delay;
6266
6267           graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],
6268                                    GfxDir[x][y]);
6269
6270           DrawLevelGraphicAnimation(x, y, graphic);
6271           PlayLevelSoundAction(x, y, ACTION_SHRINKING);
6272
6273           if (Feld[newx][newy] == EL_ACID)
6274           {
6275             SplashAcid(newx, newy);
6276
6277             return;
6278           }
6279
6280           CreateField(newx, newy, EL_DIAGONAL_GROWING);
6281
6282           Store[newx][newy] = EL_EMC_ANDROID;
6283           GfxElement[newx][newy] = EL_EMC_ANDROID;
6284           GfxAction[newx][newy] = ACTION_GROWING;
6285           GfxDir[newx][newy] = diagonal_move_dir;
6286           ChangeDelay[newx][newy] = change_delay;
6287
6288           graphic = el_act_dir2img(GfxElement[newx][newy],
6289                                    GfxAction[newx][newy], GfxDir[newx][newy]);
6290
6291           DrawLevelGraphicAnimation(newx, newy, graphic);
6292           PlayLevelSoundAction(newx, newy, ACTION_GROWING);
6293
6294           return;
6295         }
6296         else
6297         {
6298           Feld[newx][newy] = EL_EMPTY;
6299           DrawLevelField(newx, newy);
6300
6301           PlayLevelSoundAction(x, y, ACTION_DIGGING);
6302         }
6303       }
6304       else if (!IS_FREE(newx, newy))
6305       {
6306 #if 0
6307         if (IS_PLAYER(x, y))
6308           DrawPlayerField(x, y);
6309         else
6310           DrawLevelField(x, y);
6311 #endif
6312
6313         return;
6314       }
6315     }
6316     else if (IS_CUSTOM_ELEMENT(element) &&
6317              CUSTOM_ELEMENT_CAN_ENTER_FIELD(element, newx, newy))
6318     {
6319       int new_element = Feld[newx][newy];
6320
6321       if (!IS_FREE(newx, newy))
6322       {
6323         int action = (IS_DIGGABLE(new_element) ? ACTION_DIGGING :
6324                       IS_COLLECTIBLE(new_element) ? ACTION_COLLECTING :
6325                       ACTION_BREAKING);
6326
6327         /* no element can dig solid indestructible elements */
6328         if (IS_INDESTRUCTIBLE(new_element) &&
6329             !IS_DIGGABLE(new_element) &&
6330             !IS_COLLECTIBLE(new_element))
6331           return;
6332
6333         if (AmoebaNr[newx][newy] &&
6334             (new_element == EL_AMOEBA_FULL ||
6335              new_element == EL_BD_AMOEBA ||
6336              new_element == EL_AMOEBA_GROWING))
6337         {
6338           AmoebaCnt[AmoebaNr[newx][newy]]--;
6339           AmoebaCnt2[AmoebaNr[newx][newy]]--;
6340         }
6341
6342         if (IS_MOVING(newx, newy))
6343           RemoveMovingField(newx, newy);
6344         else
6345         {
6346           RemoveField(newx, newy);
6347           DrawLevelField(newx, newy);
6348         }
6349
6350         /* if digged element was about to explode, prevent the explosion */
6351         ExplodeField[newx][newy] = EX_TYPE_NONE;
6352
6353         PlayLevelSoundAction(x, y, action);
6354       }
6355
6356       Store[newx][newy] = EL_EMPTY;
6357 #if 1
6358       /* this makes it possible to leave the removed element again */
6359       if (IS_EQUAL_OR_IN_GROUP(new_element, MOVE_ENTER_EL(element)))
6360         Store[newx][newy] = new_element;
6361 #else
6362       if (IS_EQUAL_OR_IN_GROUP(new_element, MOVE_ENTER_EL(element)))
6363       {
6364         int move_leave_element = element_info[element].move_leave_element;
6365
6366         /* this makes it possible to leave the removed element again */
6367         Store[newx][newy] = (move_leave_element == EL_TRIGGER_ELEMENT ?
6368                              new_element : move_leave_element);
6369       }
6370 #endif
6371
6372       if (move_pattern & MV_MAZE_RUNNER_STYLE)
6373       {
6374         RunnerVisit[x][y] = FrameCounter;
6375         PlayerVisit[x][y] /= 8;         /* expire player visit path */
6376       }
6377     }
6378     else if (element == EL_DRAGON && IN_LEV_FIELD(newx, newy))
6379     {
6380       if (!IS_FREE(newx, newy))
6381       {
6382         if (IS_PLAYER(x, y))
6383           DrawPlayerField(x, y);
6384         else
6385           DrawLevelField(x, y);
6386
6387         return;
6388       }
6389       else
6390       {
6391         boolean wanna_flame = !RND(10);
6392         int dx = newx - x, dy = newy - y;
6393         int newx1 = newx + 1 * dx, newy1 = newy + 1 * dy;
6394         int newx2 = newx + 2 * dx, newy2 = newy + 2 * dy;
6395         int element1 = (IN_LEV_FIELD(newx1, newy1) ?
6396                         MovingOrBlocked2Element(newx1, newy1) : EL_STEELWALL);
6397         int element2 = (IN_LEV_FIELD(newx2, newy2) ?
6398                         MovingOrBlocked2Element(newx2, newy2) : EL_STEELWALL);
6399
6400         if ((wanna_flame ||
6401              IS_CLASSIC_ENEMY(element1) ||
6402              IS_CLASSIC_ENEMY(element2)) &&
6403             element1 != EL_DRAGON && element2 != EL_DRAGON &&
6404             element1 != EL_FLAMES && element2 != EL_FLAMES)
6405         {
6406           ResetGfxAnimation(x, y);
6407           GfxAction[x][y] = ACTION_ATTACKING;
6408
6409           if (IS_PLAYER(x, y))
6410             DrawPlayerField(x, y);
6411           else
6412             DrawLevelField(x, y);
6413
6414           PlayLevelSound(x, y, SND_DRAGON_ATTACKING);
6415
6416           MovDelay[x][y] = 50;
6417
6418           /* !!! */
6419 #if 0
6420           RemoveField(newx, newy);
6421 #endif
6422           Feld[newx][newy] = EL_FLAMES;
6423           if (IN_LEV_FIELD(newx1, newy1) && Feld[newx1][newy1] == EL_EMPTY)
6424           {
6425 #if 0
6426             RemoveField(newx1, newy1);
6427 #endif
6428             Feld[newx1][newy1] = EL_FLAMES;
6429           }
6430           if (IN_LEV_FIELD(newx2, newy2) && Feld[newx2][newy2] == EL_EMPTY)
6431           {
6432 #if 0
6433             RemoveField(newx2, newy2);
6434 #endif
6435             Feld[newx2][newy2] = EL_FLAMES;
6436           }
6437
6438           return;
6439         }
6440       }
6441     }
6442     else if (element == EL_YAMYAM && IN_LEV_FIELD(newx, newy) &&
6443              Feld[newx][newy] == EL_DIAMOND)
6444     {
6445       if (IS_MOVING(newx, newy))
6446         RemoveMovingField(newx, newy);
6447       else
6448       {
6449         Feld[newx][newy] = EL_EMPTY;
6450         DrawLevelField(newx, newy);
6451       }
6452
6453       PlayLevelSound(x, y, SND_YAMYAM_DIGGING);
6454     }
6455     else if (element == EL_DARK_YAMYAM && IN_LEV_FIELD(newx, newy) &&
6456              IS_FOOD_DARK_YAMYAM(Feld[newx][newy]))
6457     {
6458       if (AmoebaNr[newx][newy])
6459       {
6460         AmoebaCnt2[AmoebaNr[newx][newy]]--;
6461         if (Feld[newx][newy] == EL_AMOEBA_FULL ||
6462             Feld[newx][newy] == EL_BD_AMOEBA)
6463           AmoebaCnt[AmoebaNr[newx][newy]]--;
6464       }
6465
6466 #if 0
6467       /* !!! test !!! */
6468       if (IS_MOVING(newx, newy) || IS_BLOCKED(newx, newy))
6469       {
6470         RemoveMovingField(newx, newy);
6471       }
6472 #else
6473       if (IS_MOVING(newx, newy))
6474       {
6475         RemoveMovingField(newx, newy);
6476       }
6477 #endif
6478       else
6479       {
6480         Feld[newx][newy] = EL_EMPTY;
6481         DrawLevelField(newx, newy);
6482       }
6483
6484       PlayLevelSound(x, y, SND_DARK_YAMYAM_DIGGING);
6485     }
6486     else if ((element == EL_PACMAN || element == EL_MOLE)
6487              && IN_LEV_FIELD(newx, newy) && IS_AMOEBOID(Feld[newx][newy]))
6488     {
6489       if (AmoebaNr[newx][newy])
6490       {
6491         AmoebaCnt2[AmoebaNr[newx][newy]]--;
6492         if (Feld[newx][newy] == EL_AMOEBA_FULL ||
6493             Feld[newx][newy] == EL_BD_AMOEBA)
6494           AmoebaCnt[AmoebaNr[newx][newy]]--;
6495       }
6496
6497       if (element == EL_MOLE)
6498       {
6499         Feld[newx][newy] = EL_AMOEBA_SHRINKING;
6500         PlayLevelSound(x, y, SND_MOLE_DIGGING);
6501
6502         ResetGfxAnimation(x, y);
6503         GfxAction[x][y] = ACTION_DIGGING;
6504         DrawLevelField(x, y);
6505
6506         MovDelay[newx][newy] = 0;       /* start amoeba shrinking delay */
6507
6508         return;                         /* wait for shrinking amoeba */
6509       }
6510       else      /* element == EL_PACMAN */
6511       {
6512         Feld[newx][newy] = EL_EMPTY;
6513         DrawLevelField(newx, newy);
6514         PlayLevelSound(x, y, SND_PACMAN_DIGGING);
6515       }
6516     }
6517     else if (element == EL_MOLE && IN_LEV_FIELD(newx, newy) &&
6518              (Feld[newx][newy] == EL_AMOEBA_SHRINKING ||
6519               (Feld[newx][newy] == EL_EMPTY && Stop[newx][newy])))
6520     {
6521       /* wait for shrinking amoeba to completely disappear */
6522       return;
6523     }
6524     else if (!IN_LEV_FIELD(newx, newy) || !IS_FREE(newx, newy))
6525     {
6526       /* object was running against a wall */
6527
6528       TurnRound(x, y);
6529
6530 #if 0
6531       /* !!! NEW "CE_BLOCKED" STUFF !!! -- DOES NOT WORK YET... !!! */
6532       if (move_pattern & MV_ANY_DIRECTION &&
6533           move_pattern == MovDir[x][y])
6534       {
6535         int blocking_element =
6536           (IN_LEV_FIELD(newx, newy) ? Feld[newx][newy] : BorderElement);
6537
6538         CheckElementChangeBySide(x, y, element, blocking_element, CE_BLOCKED,
6539                                  MovDir[x][y]);
6540
6541         element = Feld[x][y];   /* element might have changed */
6542       }
6543 #endif
6544
6545       if (GFX_ELEMENT(element) != EL_SAND)     /* !!! FIX THIS (crumble) !!! */
6546         DrawLevelElementAnimation(x, y, element);
6547
6548       if (DONT_TOUCH(element))
6549         TestIfBadThingTouchesPlayer(x, y);
6550
6551       return;
6552     }
6553
6554     InitMovingField(x, y, MovDir[x][y]);
6555
6556     PlayLevelSoundAction(x, y, ACTION_MOVING);
6557   }
6558
6559   if (MovDir[x][y])
6560     ContinueMoving(x, y);
6561 }
6562
6563 void ContinueMoving(int x, int y)
6564 {
6565   int element = Feld[x][y];
6566   struct ElementInfo *ei = &element_info[element];
6567   int direction = MovDir[x][y];
6568   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
6569   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
6570   int newx = x + dx, newy = y + dy;
6571   int stored = Store[x][y];
6572   int stored_new = Store[newx][newy];
6573   boolean pushed_by_player   = (Pushed[x][y] && IS_PLAYER(x, y));
6574   boolean pushed_by_conveyor = (Pushed[x][y] && !IS_PLAYER(x, y));
6575   boolean last_line = (newy == lev_fieldy - 1);
6576
6577   MovPos[x][y] += getElementMoveStepsize(x, y);
6578
6579   if (pushed_by_player) /* special case: moving object pushed by player */
6580     MovPos[x][y] = SIGN(MovPos[x][y]) * (TILEX - ABS(PLAYERINFO(x,y)->MovPos));
6581
6582   if (ABS(MovPos[x][y]) < TILEX)
6583   {
6584     DrawLevelField(x, y);
6585
6586     return;     /* element is still moving */
6587   }
6588
6589   /* element reached destination field */
6590
6591   Feld[x][y] = EL_EMPTY;
6592   Feld[newx][newy] = element;
6593   MovPos[x][y] = 0;     /* force "not moving" for "crumbled sand" */
6594
6595   if (Store[x][y] == EL_ACID)   /* element is moving into acid pool */
6596   {
6597     element = Feld[newx][newy] = EL_ACID;
6598   }
6599   else if (element == EL_MOLE)
6600   {
6601     Feld[x][y] = EL_SAND;
6602
6603     DrawLevelFieldCrumbledSandNeighbours(x, y);
6604   }
6605   else if (element == EL_QUICKSAND_FILLING)
6606   {
6607     element = Feld[newx][newy] = get_next_element(element);
6608     Store[newx][newy] = Store[x][y];
6609   }
6610   else if (element == EL_QUICKSAND_EMPTYING)
6611   {
6612     Feld[x][y] = get_next_element(element);
6613     element = Feld[newx][newy] = Store[x][y];
6614   }
6615   else if (element == EL_MAGIC_WALL_FILLING)
6616   {
6617     element = Feld[newx][newy] = get_next_element(element);
6618     if (!game.magic_wall_active)
6619       element = Feld[newx][newy] = EL_MAGIC_WALL_DEAD;
6620     Store[newx][newy] = Store[x][y];
6621   }
6622   else if (element == EL_MAGIC_WALL_EMPTYING)
6623   {
6624     Feld[x][y] = get_next_element(element);
6625     if (!game.magic_wall_active)
6626       Feld[x][y] = EL_MAGIC_WALL_DEAD;
6627     element = Feld[newx][newy] = Store[x][y];
6628
6629 #if USE_NEW_CUSTOM_VALUE
6630     InitField(newx, newy, FALSE);
6631 #endif
6632   }
6633   else if (element == EL_BD_MAGIC_WALL_FILLING)
6634   {
6635     element = Feld[newx][newy] = get_next_element(element);
6636     if (!game.magic_wall_active)
6637       element = Feld[newx][newy] = EL_BD_MAGIC_WALL_DEAD;
6638     Store[newx][newy] = Store[x][y];
6639   }
6640   else if (element == EL_BD_MAGIC_WALL_EMPTYING)
6641   {
6642     Feld[x][y] = get_next_element(element);
6643     if (!game.magic_wall_active)
6644       Feld[x][y] = EL_BD_MAGIC_WALL_DEAD;
6645     element = Feld[newx][newy] = Store[x][y];
6646
6647 #if USE_NEW_CUSTOM_VALUE
6648     InitField(newx, newy, FALSE);
6649 #endif
6650   }
6651   else if (element == EL_AMOEBA_DROPPING)
6652   {
6653     Feld[x][y] = get_next_element(element);
6654     element = Feld[newx][newy] = Store[x][y];
6655   }
6656   else if (element == EL_SOKOBAN_OBJECT)
6657   {
6658     if (Back[x][y])
6659       Feld[x][y] = Back[x][y];
6660
6661     if (Back[newx][newy])
6662       Feld[newx][newy] = EL_SOKOBAN_FIELD_FULL;
6663
6664     Back[x][y] = Back[newx][newy] = 0;
6665   }
6666
6667   Store[x][y] = EL_EMPTY;
6668   MovPos[x][y] = 0;
6669   MovDir[x][y] = 0;
6670   MovDelay[x][y] = 0;
6671
6672   MovDelay[newx][newy] = 0;
6673
6674 #if 1
6675   if (CAN_CHANGE_OR_HAS_ACTION(element))
6676 #else
6677   if (CAN_CHANGE(element))
6678 #endif
6679   {
6680     /* copy element change control values to new field */
6681     ChangeDelay[newx][newy] = ChangeDelay[x][y];
6682     ChangePage[newx][newy]  = ChangePage[x][y];
6683     ChangeCount[newx][newy] = ChangeCount[x][y];
6684     ChangeEvent[newx][newy] = ChangeEvent[x][y];
6685
6686 #if 0
6687 #if USE_NEW_CUSTOM_VALUE
6688     CustomValue[newx][newy] = CustomValue[x][y];
6689 #endif
6690 #endif
6691   }
6692
6693 #if 1
6694 #if USE_NEW_CUSTOM_VALUE
6695     CustomValue[newx][newy] = CustomValue[x][y];
6696 #endif
6697 #endif
6698
6699   ChangeDelay[x][y] = 0;
6700   ChangePage[x][y] = -1;
6701   ChangeCount[x][y] = 0;
6702   ChangeEvent[x][y] = -1;
6703
6704 #if USE_NEW_CUSTOM_VALUE
6705   CustomValue[x][y] = 0;
6706 #endif
6707
6708   /* copy animation control values to new field */
6709   GfxFrame[newx][newy]  = GfxFrame[x][y];
6710   GfxRandom[newx][newy] = GfxRandom[x][y];      /* keep same random value */
6711   GfxAction[newx][newy] = GfxAction[x][y];      /* keep action one frame  */
6712   GfxDir[newx][newy]    = GfxDir[x][y];         /* keep element direction */
6713
6714   Pushed[x][y] = Pushed[newx][newy] = FALSE;
6715
6716   /* some elements can leave other elements behind after moving */
6717 #if 1
6718   if (ei->move_leave_element != EL_EMPTY &&
6719       (ei->move_leave_type == LEAVE_TYPE_UNLIMITED || stored != EL_EMPTY) &&
6720       (!IS_PLAYER(x, y) || IS_WALKABLE(ei->move_leave_element)))
6721 #else
6722   if (IS_CUSTOM_ELEMENT(element) && ei->move_leave_element != EL_EMPTY &&
6723       (ei->move_leave_type == LEAVE_TYPE_UNLIMITED || stored != EL_EMPTY) &&
6724       (!IS_PLAYER(x, y) || IS_WALKABLE(ei->move_leave_element)))
6725 #endif
6726   {
6727     int move_leave_element = ei->move_leave_element;
6728
6729 #if 1
6730 #if 1
6731     /* this makes it possible to leave the removed element again */
6732     if (ei->move_leave_element == EL_TRIGGER_ELEMENT)
6733       move_leave_element = (stored == EL_ACID ? EL_EMPTY : stored);
6734 #else
6735     /* this makes it possible to leave the removed element again */
6736     if (ei->move_leave_element == EL_TRIGGER_ELEMENT)
6737       move_leave_element = stored;
6738 #endif
6739 #else
6740     /* this makes it possible to leave the removed element again */
6741     if (ei->move_leave_type == LEAVE_TYPE_LIMITED &&
6742         ei->move_leave_element == EL_TRIGGER_ELEMENT)
6743       move_leave_element = stored;
6744 #endif
6745
6746     Feld[x][y] = move_leave_element;
6747
6748     if (element_info[Feld[x][y]].move_direction_initial == MV_START_PREVIOUS)
6749       MovDir[x][y] = direction;
6750
6751     InitField(x, y, FALSE);
6752
6753     if (GFX_CRUMBLED(Feld[x][y]))
6754       DrawLevelFieldCrumbledSandNeighbours(x, y);
6755
6756     if (ELEM_IS_PLAYER(move_leave_element))
6757       RelocatePlayer(x, y, move_leave_element);
6758   }
6759
6760   /* do this after checking for left-behind element */
6761   ResetGfxAnimation(x, y);      /* reset animation values for old field */
6762
6763   if (!CAN_MOVE(element) ||
6764       (CAN_FALL(element) && direction == MV_DOWN &&
6765        (element == EL_SPRING ||
6766         element_info[element].move_pattern == MV_WHEN_PUSHED ||
6767         element_info[element].move_pattern == MV_WHEN_DROPPED)))
6768     GfxDir[x][y] = MovDir[newx][newy] = 0;
6769
6770   DrawLevelField(x, y);
6771   DrawLevelField(newx, newy);
6772
6773   Stop[newx][newy] = TRUE;      /* ignore this element until the next frame */
6774
6775   /* prevent pushed element from moving on in pushed direction */
6776   if (pushed_by_player && CAN_MOVE(element) &&
6777       element_info[element].move_pattern & MV_ANY_DIRECTION &&
6778       !(element_info[element].move_pattern & direction))
6779     TurnRound(newx, newy);
6780
6781   /* prevent elements on conveyor belt from moving on in last direction */
6782   if (pushed_by_conveyor && CAN_FALL(element) &&
6783       direction & MV_HORIZONTAL)
6784     MovDir[newx][newy] = 0;
6785
6786   if (!pushed_by_player)
6787   {
6788     int nextx = newx + dx, nexty = newy + dy;
6789     boolean check_collision_again = IN_LEV_FIELD_AND_IS_FREE(nextx, nexty);
6790
6791     WasJustMoving[newx][newy] = CHECK_DELAY_MOVING;
6792
6793     if (CAN_FALL(element) && direction == MV_DOWN)
6794       WasJustFalling[newx][newy] = CHECK_DELAY_FALLING;
6795
6796     if ((!CAN_FALL(element) || direction == MV_DOWN) && check_collision_again)
6797       CheckCollision[newx][newy] = CHECK_DELAY_COLLISION;
6798   }
6799
6800   if (DONT_TOUCH(element))      /* object may be nasty to player or others */
6801   {
6802     TestIfBadThingTouchesPlayer(newx, newy);
6803     TestIfBadThingTouchesFriend(newx, newy);
6804
6805     if (!IS_CUSTOM_ELEMENT(element))
6806       TestIfBadThingTouchesOtherBadThing(newx, newy);
6807   }
6808   else if (element == EL_PENGUIN)
6809     TestIfFriendTouchesBadThing(newx, newy);
6810
6811   /* give the player one last chance (one more frame) to move away */
6812   if (CAN_FALL(element) && direction == MV_DOWN &&
6813       (last_line || (!IS_FREE(x, newy + 1) &&
6814                      (!IS_PLAYER(x, newy + 1) ||
6815                       game.engine_version < VERSION_IDENT(3,1,1,0)))))
6816     Impact(x, newy);
6817
6818   if (pushed_by_player && !game.use_change_when_pushing_bug)
6819   {
6820     int push_side = MV_DIR_OPPOSITE(direction);
6821     struct PlayerInfo *player = PLAYERINFO(x, y);
6822
6823     CheckElementChangeByPlayer(newx, newy, element, CE_PUSHED_BY_PLAYER,
6824                                player->index_bit, push_side);
6825     CheckTriggeredElementChangeByPlayer(newx,newy, element, CE_PLAYER_PUSHES_X,
6826                                         player->index_bit, push_side);
6827   }
6828
6829   if (element == EL_EMC_ANDROID && pushed_by_player)    /* make another move */
6830     MovDelay[newx][newy] = 1;
6831
6832   CheckTriggeredElementChangeBySide(x, y, element, CE_MOVE_OF_X, direction);
6833
6834   TestIfElementTouchesCustomElement(x, y);      /* empty or new element */
6835
6836 #if 0
6837   if (ChangePage[newx][newy] != -1)             /* delayed change */
6838   {
6839     int page = ChangePage[newx][newy];
6840     struct ElementChangeInfo *change = &ei->change_page[page];
6841
6842     ChangePage[newx][newy] = -1;
6843
6844     if (change->can_change)
6845     {
6846       if (ChangeElement(newx, newy, element, page))
6847       {
6848         if (change->post_change_function)
6849           change->post_change_function(newx, newy);
6850       }
6851     }
6852
6853     if (change->has_action)
6854       ExecuteCustomElementAction(newx, newy, element, page);
6855   }
6856 #endif
6857
6858   TestIfElementHitsCustomElement(newx, newy, direction);
6859   TestIfPlayerTouchesCustomElement(newx, newy);
6860   TestIfElementTouchesCustomElement(newx, newy);
6861
6862 #if 1
6863   if (IS_CUSTOM_ELEMENT(element) && ei->move_enter_element != EL_EMPTY &&
6864       IS_EQUAL_OR_IN_GROUP(stored_new, ei->move_enter_element))
6865     CheckElementChangeBySide(newx, newy, element, stored_new, CE_DIGGING_X,
6866                                       MV_DIR_OPPOSITE(direction));
6867 #endif
6868 }
6869
6870 int AmoebeNachbarNr(int ax, int ay)
6871 {
6872   int i;
6873   int element = Feld[ax][ay];
6874   int group_nr = 0;
6875   static int xy[4][2] =
6876   {
6877     { 0, -1 },
6878     { -1, 0 },
6879     { +1, 0 },
6880     { 0, +1 }
6881   };
6882
6883   for (i = 0; i < NUM_DIRECTIONS; i++)
6884   {
6885     int x = ax + xy[i][0];
6886     int y = ay + xy[i][1];
6887
6888     if (!IN_LEV_FIELD(x, y))
6889       continue;
6890
6891     if (Feld[x][y] == element && AmoebaNr[x][y] > 0)
6892       group_nr = AmoebaNr[x][y];
6893   }
6894
6895   return group_nr;
6896 }
6897
6898 void AmoebenVereinigen(int ax, int ay)
6899 {
6900   int i, x, y, xx, yy;
6901   int new_group_nr = AmoebaNr[ax][ay];
6902   static int xy[4][2] =
6903   {
6904     { 0, -1 },
6905     { -1, 0 },
6906     { +1, 0 },
6907     { 0, +1 }
6908   };
6909
6910   if (new_group_nr == 0)
6911     return;
6912
6913   for (i = 0; i < NUM_DIRECTIONS; i++)
6914   {
6915     x = ax + xy[i][0];
6916     y = ay + xy[i][1];
6917
6918     if (!IN_LEV_FIELD(x, y))
6919       continue;
6920
6921     if ((Feld[x][y] == EL_AMOEBA_FULL ||
6922          Feld[x][y] == EL_BD_AMOEBA ||
6923          Feld[x][y] == EL_AMOEBA_DEAD) &&
6924         AmoebaNr[x][y] != new_group_nr)
6925     {
6926       int old_group_nr = AmoebaNr[x][y];
6927
6928       if (old_group_nr == 0)
6929         return;
6930
6931       AmoebaCnt[new_group_nr] += AmoebaCnt[old_group_nr];
6932       AmoebaCnt[old_group_nr] = 0;
6933       AmoebaCnt2[new_group_nr] += AmoebaCnt2[old_group_nr];
6934       AmoebaCnt2[old_group_nr] = 0;
6935
6936 #if 1
6937       SCAN_PLAYFIELD(xx, yy)
6938 #else
6939       for (yy = 0; yy < lev_fieldy; yy++) for (xx = 0; xx < lev_fieldx; xx++)
6940 #endif
6941       {
6942         if (AmoebaNr[xx][yy] == old_group_nr)
6943           AmoebaNr[xx][yy] = new_group_nr;
6944       }
6945     }
6946   }
6947 }
6948
6949 void AmoebeUmwandeln(int ax, int ay)
6950 {
6951   int i, x, y;
6952
6953   if (Feld[ax][ay] == EL_AMOEBA_DEAD)
6954   {
6955     int group_nr = AmoebaNr[ax][ay];
6956
6957 #ifdef DEBUG
6958     if (group_nr == 0)
6959     {
6960       printf("AmoebeUmwandeln(): ax = %d, ay = %d\n", ax, ay);
6961       printf("AmoebeUmwandeln(): This should never happen!\n");
6962       return;
6963     }
6964 #endif
6965
6966 #if 1
6967     SCAN_PLAYFIELD(x, y)
6968 #else
6969     for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
6970 #endif
6971     {
6972       if (Feld[x][y] == EL_AMOEBA_DEAD && AmoebaNr[x][y] == group_nr)
6973       {
6974         AmoebaNr[x][y] = 0;
6975         Feld[x][y] = EL_AMOEBA_TO_DIAMOND;
6976       }
6977     }
6978
6979     PlayLevelSound(ax, ay, (IS_GEM(level.amoeba_content) ?
6980                             SND_AMOEBA_TURNING_TO_GEM :
6981                             SND_AMOEBA_TURNING_TO_ROCK));
6982     Bang(ax, ay);
6983   }
6984   else
6985   {
6986     static int xy[4][2] =
6987     {
6988       { 0, -1 },
6989       { -1, 0 },
6990       { +1, 0 },
6991       { 0, +1 }
6992     };
6993
6994     for (i = 0; i < NUM_DIRECTIONS; i++)
6995     {
6996       x = ax + xy[i][0];
6997       y = ay + xy[i][1];
6998
6999       if (!IN_LEV_FIELD(x, y))
7000         continue;
7001
7002       if (Feld[x][y] == EL_AMOEBA_TO_DIAMOND)
7003       {
7004         PlayLevelSound(x, y, (IS_GEM(level.amoeba_content) ?
7005                               SND_AMOEBA_TURNING_TO_GEM :
7006                               SND_AMOEBA_TURNING_TO_ROCK));
7007         Bang(x, y);
7008       }
7009     }
7010   }
7011 }
7012
7013 void AmoebeUmwandelnBD(int ax, int ay, int new_element)
7014 {
7015   int x, y;
7016   int group_nr = AmoebaNr[ax][ay];
7017   boolean done = FALSE;
7018
7019 #ifdef DEBUG
7020   if (group_nr == 0)
7021   {
7022     printf("AmoebeUmwandelnBD(): ax = %d, ay = %d\n", ax, ay);
7023     printf("AmoebeUmwandelnBD(): This should never happen!\n");
7024     return;
7025   }
7026 #endif
7027
7028 #if 1
7029   SCAN_PLAYFIELD(x, y)
7030 #else
7031   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
7032 #endif
7033   {
7034     if (AmoebaNr[x][y] == group_nr &&
7035         (Feld[x][y] == EL_AMOEBA_DEAD ||
7036          Feld[x][y] == EL_BD_AMOEBA ||
7037          Feld[x][y] == EL_AMOEBA_GROWING))
7038     {
7039       AmoebaNr[x][y] = 0;
7040       Feld[x][y] = new_element;
7041       InitField(x, y, FALSE);
7042       DrawLevelField(x, y);
7043       done = TRUE;
7044     }
7045   }
7046
7047   if (done)
7048     PlayLevelSound(ax, ay, (new_element == EL_BD_ROCK ?
7049                             SND_BD_AMOEBA_TURNING_TO_ROCK :
7050                             SND_BD_AMOEBA_TURNING_TO_GEM));
7051 }
7052
7053 void AmoebeWaechst(int x, int y)
7054 {
7055   static unsigned long sound_delay = 0;
7056   static unsigned long sound_delay_value = 0;
7057
7058   if (!MovDelay[x][y])          /* start new growing cycle */
7059   {
7060     MovDelay[x][y] = 7;
7061
7062     if (DelayReached(&sound_delay, sound_delay_value))
7063     {
7064       PlayLevelSoundElementAction(x, y, Store[x][y], ACTION_GROWING);
7065       sound_delay_value = 30;
7066     }
7067   }
7068
7069   if (MovDelay[x][y])           /* wait some time before growing bigger */
7070   {
7071     MovDelay[x][y]--;
7072     if (MovDelay[x][y]/2 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
7073     {
7074       int frame = getGraphicAnimationFrame(IMG_AMOEBA_GROWING,
7075                                            6 - MovDelay[x][y]);
7076
7077       DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_GROWING, frame);
7078     }
7079
7080     if (!MovDelay[x][y])
7081     {
7082       Feld[x][y] = Store[x][y];
7083       Store[x][y] = 0;
7084       DrawLevelField(x, y);
7085     }
7086   }
7087 }
7088
7089 void AmoebaDisappearing(int x, int y)
7090 {
7091   static unsigned long sound_delay = 0;
7092   static unsigned long sound_delay_value = 0;
7093
7094   if (!MovDelay[x][y])          /* start new shrinking cycle */
7095   {
7096     MovDelay[x][y] = 7;
7097
7098     if (DelayReached(&sound_delay, sound_delay_value))
7099       sound_delay_value = 30;
7100   }
7101
7102   if (MovDelay[x][y])           /* wait some time before shrinking */
7103   {
7104     MovDelay[x][y]--;
7105     if (MovDelay[x][y]/2 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
7106     {
7107       int frame = getGraphicAnimationFrame(IMG_AMOEBA_SHRINKING,
7108                                            6 - MovDelay[x][y]);
7109
7110       DrawGraphic(SCREENX(x), SCREENY(y), IMG_AMOEBA_SHRINKING, frame);
7111     }
7112
7113     if (!MovDelay[x][y])
7114     {
7115       Feld[x][y] = EL_EMPTY;
7116       DrawLevelField(x, y);
7117
7118       /* don't let mole enter this field in this cycle;
7119          (give priority to objects falling to this field from above) */
7120       Stop[x][y] = TRUE;
7121     }
7122   }
7123 }
7124
7125 void AmoebeAbleger(int ax, int ay)
7126 {
7127   int i;
7128   int element = Feld[ax][ay];
7129   int graphic = el2img(element);
7130   int newax = ax, neway = ay;
7131   boolean can_drop = (element == EL_AMOEBA_WET || element == EL_EMC_DRIPPER);
7132   static int xy[4][2] =
7133   {
7134     { 0, -1 },
7135     { -1, 0 },
7136     { +1, 0 },
7137     { 0, +1 }
7138   };
7139
7140   if (!level.amoeba_speed && element != EL_EMC_DRIPPER)
7141   {
7142     Feld[ax][ay] = EL_AMOEBA_DEAD;
7143     DrawLevelField(ax, ay);
7144     return;
7145   }
7146
7147   if (IS_ANIMATED(graphic))
7148     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
7149
7150   if (!MovDelay[ax][ay])        /* start making new amoeba field */
7151     MovDelay[ax][ay] = RND(FRAMES_PER_SECOND * 25 / (1 + level.amoeba_speed));
7152
7153   if (MovDelay[ax][ay])         /* wait some time before making new amoeba */
7154   {
7155     MovDelay[ax][ay]--;
7156     if (MovDelay[ax][ay])
7157       return;
7158   }
7159
7160   if (can_drop)                 /* EL_AMOEBA_WET or EL_EMC_DRIPPER */
7161   {
7162     int start = RND(4);
7163     int x = ax + xy[start][0];
7164     int y = ay + xy[start][1];
7165
7166     if (!IN_LEV_FIELD(x, y))
7167       return;
7168
7169     if (IS_FREE(x, y) ||
7170         CAN_GROW_INTO(Feld[x][y]) ||
7171         Feld[x][y] == EL_QUICKSAND_EMPTY)
7172     {
7173       newax = x;
7174       neway = y;
7175     }
7176
7177     if (newax == ax && neway == ay)
7178       return;
7179   }
7180   else                          /* normal or "filled" (BD style) amoeba */
7181   {
7182     int start = RND(4);
7183     boolean waiting_for_player = FALSE;
7184
7185     for (i = 0; i < NUM_DIRECTIONS; i++)
7186     {
7187       int j = (start + i) % 4;
7188       int x = ax + xy[j][0];
7189       int y = ay + xy[j][1];
7190
7191       if (!IN_LEV_FIELD(x, y))
7192         continue;
7193
7194       if (IS_FREE(x, y) ||
7195           CAN_GROW_INTO(Feld[x][y]) ||
7196           Feld[x][y] == EL_QUICKSAND_EMPTY)
7197       {
7198         newax = x;
7199         neway = y;
7200         break;
7201       }
7202       else if (IS_PLAYER(x, y))
7203         waiting_for_player = TRUE;
7204     }
7205
7206     if (newax == ax && neway == ay)             /* amoeba cannot grow */
7207     {
7208       if (i == 4 && (!waiting_for_player || element == EL_BD_AMOEBA))
7209       {
7210         Feld[ax][ay] = EL_AMOEBA_DEAD;
7211         DrawLevelField(ax, ay);
7212         AmoebaCnt[AmoebaNr[ax][ay]]--;
7213
7214         if (AmoebaCnt[AmoebaNr[ax][ay]] <= 0)   /* amoeba is completely dead */
7215         {
7216           if (element == EL_AMOEBA_FULL)
7217             AmoebeUmwandeln(ax, ay);
7218           else if (element == EL_BD_AMOEBA)
7219             AmoebeUmwandelnBD(ax, ay, level.amoeba_content);
7220         }
7221       }
7222       return;
7223     }
7224     else if (element == EL_AMOEBA_FULL || element == EL_BD_AMOEBA)
7225     {
7226       /* amoeba gets larger by growing in some direction */
7227
7228       int new_group_nr = AmoebaNr[ax][ay];
7229
7230 #ifdef DEBUG
7231   if (new_group_nr == 0)
7232   {
7233     printf("AmoebeAbleger(): newax = %d, neway = %d\n", newax, neway);
7234     printf("AmoebeAbleger(): This should never happen!\n");
7235     return;
7236   }
7237 #endif
7238
7239       AmoebaNr[newax][neway] = new_group_nr;
7240       AmoebaCnt[new_group_nr]++;
7241       AmoebaCnt2[new_group_nr]++;
7242
7243       /* if amoeba touches other amoeba(s) after growing, unify them */
7244       AmoebenVereinigen(newax, neway);
7245
7246       if (element == EL_BD_AMOEBA && AmoebaCnt2[new_group_nr] >= 200)
7247       {
7248         AmoebeUmwandelnBD(newax, neway, EL_BD_ROCK);
7249         return;
7250       }
7251     }
7252   }
7253
7254   if (!can_drop || neway < ay || !IS_FREE(newax, neway) ||
7255       (neway == lev_fieldy - 1 && newax != ax))
7256   {
7257     Feld[newax][neway] = EL_AMOEBA_GROWING;     /* creation of new amoeba */
7258     Store[newax][neway] = element;
7259   }
7260   else if (neway == ay || element == EL_EMC_DRIPPER)
7261   {
7262     Feld[newax][neway] = EL_AMOEBA_DROP;        /* drop left/right of amoeba */
7263
7264     PlayLevelSoundAction(newax, neway, ACTION_GROWING);
7265   }
7266   else
7267   {
7268     InitMovingField(ax, ay, MV_DOWN);           /* drop dripping from amoeba */
7269     Feld[ax][ay] = EL_AMOEBA_DROPPING;
7270     Store[ax][ay] = EL_AMOEBA_DROP;
7271     ContinueMoving(ax, ay);
7272     return;
7273   }
7274
7275   DrawLevelField(newax, neway);
7276 }
7277
7278 void Life(int ax, int ay)
7279 {
7280   int x1, y1, x2, y2;
7281 #if 0
7282   static int life[4] = { 2, 3, 3, 3 };  /* parameters for "game of life" */
7283 #endif
7284   int life_time = 40;
7285   int element = Feld[ax][ay];
7286   int graphic = el2img(element);
7287   int *life_parameter = (element == EL_GAME_OF_LIFE ? level.game_of_life :
7288                          level.biomaze);
7289   boolean changed = FALSE;
7290
7291   if (IS_ANIMATED(graphic))
7292     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
7293
7294   if (Stop[ax][ay])
7295     return;
7296
7297   if (!MovDelay[ax][ay])        /* start new "game of life" cycle */
7298     MovDelay[ax][ay] = life_time;
7299
7300   if (MovDelay[ax][ay])         /* wait some time before next cycle */
7301   {
7302     MovDelay[ax][ay]--;
7303     if (MovDelay[ax][ay])
7304       return;
7305   }
7306
7307   for (y1 = -1; y1 < 2; y1++) for (x1 = -1; x1 < 2; x1++)
7308   {
7309     int xx = ax+x1, yy = ay+y1;
7310     int nachbarn = 0;
7311
7312     if (!IN_LEV_FIELD(xx, yy))
7313       continue;
7314
7315     for (y2 = -1; y2 < 2; y2++) for (x2 = -1; x2 < 2; x2++)
7316     {
7317       int x = xx+x2, y = yy+y2;
7318
7319       if (!IN_LEV_FIELD(x, y) || (x == xx && y == yy))
7320         continue;
7321
7322       if (((Feld[x][y] == element ||
7323             (element == EL_GAME_OF_LIFE && IS_PLAYER(x, y))) &&
7324            !Stop[x][y]) ||
7325           (IS_FREE(x, y) && Stop[x][y]))
7326         nachbarn++;
7327     }
7328
7329     if (xx == ax && yy == ay)           /* field in the middle */
7330     {
7331       if (nachbarn < life_parameter[0] ||
7332           nachbarn > life_parameter[1])
7333       {
7334         Feld[xx][yy] = EL_EMPTY;
7335         if (!Stop[xx][yy])
7336           DrawLevelField(xx, yy);
7337         Stop[xx][yy] = TRUE;
7338         changed = TRUE;
7339       }
7340     }
7341     else if (IS_FREE(xx, yy) || CAN_GROW_INTO(Feld[xx][yy]))
7342     {                                   /* free border field */
7343       if (nachbarn >= life_parameter[2] &&
7344           nachbarn <= life_parameter[3])
7345       {
7346         Feld[xx][yy] = element;
7347         MovDelay[xx][yy] = (element == EL_GAME_OF_LIFE ? 0 : life_time-1);
7348         if (!Stop[xx][yy])
7349           DrawLevelField(xx, yy);
7350         Stop[xx][yy] = TRUE;
7351         changed = TRUE;
7352       }
7353     }
7354   }
7355
7356   if (changed)
7357     PlayLevelSound(ax, ay, element == EL_BIOMAZE ? SND_BIOMAZE_GROWING :
7358                    SND_GAME_OF_LIFE_GROWING);
7359 }
7360
7361 static void InitRobotWheel(int x, int y)
7362 {
7363   ChangeDelay[x][y] = level.time_wheel * FRAMES_PER_SECOND;
7364 }
7365
7366 static void RunRobotWheel(int x, int y)
7367 {
7368   PlayLevelSound(x, y, SND_ROBOT_WHEEL_ACTIVE);
7369 }
7370
7371 static void StopRobotWheel(int x, int y)
7372 {
7373   if (ZX == x && ZY == y)
7374     ZX = ZY = -1;
7375 }
7376
7377 static void InitTimegateWheel(int x, int y)
7378 {
7379   ChangeDelay[x][y] = level.time_timegate * FRAMES_PER_SECOND;
7380 }
7381
7382 static void RunTimegateWheel(int x, int y)
7383 {
7384   PlayLevelSound(x, y, SND_TIMEGATE_SWITCH_ACTIVE);
7385 }
7386
7387 static void InitMagicBallDelay(int x, int y)
7388 {
7389 #if 1
7390   ChangeDelay[x][y] = (level.ball_time + 1) * 8 + 1;
7391 #else
7392   ChangeDelay[x][y] = level.ball_time * FRAMES_PER_SECOND + 1;
7393 #endif
7394 }
7395
7396 static void ActivateMagicBall(int bx, int by)
7397 {
7398   int x, y;
7399
7400   if (level.ball_random)
7401   {
7402     int pos_border = RND(8);    /* select one of the eight border elements */
7403     int pos_content = (pos_border > 3 ? pos_border + 1 : pos_border);
7404     int xx = pos_content % 3;
7405     int yy = pos_content / 3;
7406
7407     x = bx - 1 + xx;
7408     y = by - 1 + yy;
7409
7410     if (IN_LEV_FIELD(x, y) && Feld[x][y] == EL_EMPTY)
7411       CreateField(x, y, level.ball_content[game.ball_content_nr].e[xx][yy]);
7412   }
7413   else
7414   {
7415     for (y = by - 1; y <= by + 1; y++) for (x = bx - 1; x <= bx + 1; x++)
7416     {
7417       int xx = x - bx + 1;
7418       int yy = y - by + 1;
7419
7420       if (IN_LEV_FIELD(x, y) && Feld[x][y] == EL_EMPTY)
7421         CreateField(x, y, level.ball_content[game.ball_content_nr].e[xx][yy]);
7422     }
7423   }
7424
7425   game.ball_content_nr = (game.ball_content_nr + 1) % level.num_ball_contents;
7426 }
7427
7428 static void InitDiagonalMovingElement(int x, int y)
7429 {
7430 #if 0
7431   MovDelay[x][y] = level.android_move_time;
7432 #endif
7433 }
7434
7435 void CheckExit(int x, int y)
7436 {
7437   if (local_player->gems_still_needed > 0 ||
7438       local_player->sokobanfields_still_needed > 0 ||
7439       local_player->lights_still_needed > 0)
7440   {
7441     int element = Feld[x][y];
7442     int graphic = el2img(element);
7443
7444     if (IS_ANIMATED(graphic))
7445       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
7446
7447     return;
7448   }
7449
7450   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
7451     return;
7452
7453   Feld[x][y] = EL_EXIT_OPENING;
7454
7455   PlayLevelSoundNearest(x, y, SND_CLASS_EXIT_OPENING);
7456 }
7457
7458 void CheckExitSP(int x, int y)
7459 {
7460   if (local_player->gems_still_needed > 0)
7461   {
7462     int element = Feld[x][y];
7463     int graphic = el2img(element);
7464
7465     if (IS_ANIMATED(graphic))
7466       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
7467
7468     return;
7469   }
7470
7471   if (AllPlayersGone)   /* do not re-open exit door closed after last player */
7472     return;
7473
7474   Feld[x][y] = EL_SP_EXIT_OPENING;
7475
7476   PlayLevelSoundNearest(x, y, SND_CLASS_SP_EXIT_OPENING);
7477 }
7478
7479 static void CloseAllOpenTimegates()
7480 {
7481   int x, y;
7482
7483 #if 1
7484   SCAN_PLAYFIELD(x, y)
7485 #else
7486   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
7487 #endif
7488   {
7489     int element = Feld[x][y];
7490
7491     if (element == EL_TIMEGATE_OPEN || element == EL_TIMEGATE_OPENING)
7492     {
7493       Feld[x][y] = EL_TIMEGATE_CLOSING;
7494
7495       PlayLevelSoundAction(x, y, ACTION_CLOSING);
7496     }
7497   }
7498 }
7499
7500 void EdelsteinFunkeln(int x, int y)
7501 {
7502   if (!IN_SCR_FIELD(SCREENX(x), SCREENY(y)) || IS_MOVING(x, y))
7503     return;
7504
7505   if (Feld[x][y] == EL_BD_DIAMOND)
7506     return;
7507
7508   if (MovDelay[x][y] == 0)      /* next animation frame */
7509     MovDelay[x][y] = 11 * !SimpleRND(500);
7510
7511   if (MovDelay[x][y] != 0)      /* wait some time before next frame */
7512   {
7513     MovDelay[x][y]--;
7514
7515     if (setup.direct_draw && MovDelay[x][y])
7516       SetDrawtoField(DRAW_BUFFERED);
7517
7518     DrawLevelElementAnimation(x, y, Feld[x][y]);
7519
7520     if (MovDelay[x][y] != 0)
7521     {
7522       int frame = getGraphicAnimationFrame(IMG_TWINKLE_WHITE,
7523                                            10 - MovDelay[x][y]);
7524
7525       DrawGraphicThruMask(SCREENX(x), SCREENY(y), IMG_TWINKLE_WHITE, frame);
7526
7527       if (setup.direct_draw)
7528       {
7529         int dest_x, dest_y;
7530
7531         dest_x = FX + SCREENX(x) * TILEX;
7532         dest_y = FY + SCREENY(y) * TILEY;
7533
7534         BlitBitmap(drawto_field, window,
7535                    dest_x, dest_y, TILEX, TILEY, dest_x, dest_y);
7536         SetDrawtoField(DRAW_DIRECT);
7537       }
7538     }
7539   }
7540 }
7541
7542 void MauerWaechst(int x, int y)
7543 {
7544   int delay = 6;
7545
7546   if (!MovDelay[x][y])          /* next animation frame */
7547     MovDelay[x][y] = 3 * delay;
7548
7549   if (MovDelay[x][y])           /* wait some time before next frame */
7550   {
7551     MovDelay[x][y]--;
7552
7553     if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
7554     {
7555       int graphic = el_dir2img(Feld[x][y], GfxDir[x][y]);
7556       int frame = getGraphicAnimationFrame(graphic, 17 - MovDelay[x][y]);
7557
7558       DrawGraphic(SCREENX(x), SCREENY(y), graphic, frame);
7559     }
7560
7561     if (!MovDelay[x][y])
7562     {
7563       if (MovDir[x][y] == MV_LEFT)
7564       {
7565         if (IN_LEV_FIELD(x - 1, y) && IS_WALL(Feld[x - 1][y]))
7566           DrawLevelField(x - 1, y);
7567       }
7568       else if (MovDir[x][y] == MV_RIGHT)
7569       {
7570         if (IN_LEV_FIELD(x + 1, y) && IS_WALL(Feld[x + 1][y]))
7571           DrawLevelField(x + 1, y);
7572       }
7573       else if (MovDir[x][y] == MV_UP)
7574       {
7575         if (IN_LEV_FIELD(x, y - 1) && IS_WALL(Feld[x][y - 1]))
7576           DrawLevelField(x, y - 1);
7577       }
7578       else
7579       {
7580         if (IN_LEV_FIELD(x, y + 1) && IS_WALL(Feld[x][y + 1]))
7581           DrawLevelField(x, y + 1);
7582       }
7583
7584       Feld[x][y] = Store[x][y];
7585       Store[x][y] = 0;
7586       GfxDir[x][y] = MovDir[x][y] = MV_NONE;
7587       DrawLevelField(x, y);
7588     }
7589   }
7590 }
7591
7592 void MauerAbleger(int ax, int ay)
7593 {
7594   int element = Feld[ax][ay];
7595   int graphic = el2img(element);
7596   boolean oben_frei = FALSE, unten_frei = FALSE;
7597   boolean links_frei = FALSE, rechts_frei = FALSE;
7598   boolean oben_massiv = FALSE, unten_massiv = FALSE;
7599   boolean links_massiv = FALSE, rechts_massiv = FALSE;
7600   boolean new_wall = FALSE;
7601
7602   if (IS_ANIMATED(graphic))
7603     DrawLevelGraphicAnimationIfNeeded(ax, ay, graphic);
7604
7605   if (!MovDelay[ax][ay])        /* start building new wall */
7606     MovDelay[ax][ay] = 6;
7607
7608   if (MovDelay[ax][ay])         /* wait some time before building new wall */
7609   {
7610     MovDelay[ax][ay]--;
7611     if (MovDelay[ax][ay])
7612       return;
7613   }
7614
7615   if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
7616     oben_frei = TRUE;
7617   if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
7618     unten_frei = TRUE;
7619   if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
7620     links_frei = TRUE;
7621   if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
7622     rechts_frei = TRUE;
7623
7624   if (element == EL_EXPANDABLE_WALL_VERTICAL ||
7625       element == EL_EXPANDABLE_WALL_ANY)
7626   {
7627     if (oben_frei)
7628     {
7629       Feld[ax][ay-1] = EL_EXPANDABLE_WALL_GROWING;
7630       Store[ax][ay-1] = element;
7631       GfxDir[ax][ay-1] = MovDir[ax][ay-1] = MV_UP;
7632       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
7633         DrawGraphic(SCREENX(ax), SCREENY(ay - 1),
7634                     IMG_EXPANDABLE_WALL_GROWING_UP, 0);
7635       new_wall = TRUE;
7636     }
7637     if (unten_frei)
7638     {
7639       Feld[ax][ay+1] = EL_EXPANDABLE_WALL_GROWING;
7640       Store[ax][ay+1] = element;
7641       GfxDir[ax][ay+1] = MovDir[ax][ay+1] = MV_DOWN;
7642       if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
7643         DrawGraphic(SCREENX(ax), SCREENY(ay + 1),
7644                     IMG_EXPANDABLE_WALL_GROWING_DOWN, 0);
7645       new_wall = TRUE;
7646     }
7647   }
7648
7649   if (element == EL_EXPANDABLE_WALL_HORIZONTAL ||
7650       element == EL_EXPANDABLE_WALL_ANY ||
7651       element == EL_EXPANDABLE_WALL)
7652   {
7653     if (links_frei)
7654     {
7655       Feld[ax-1][ay] = EL_EXPANDABLE_WALL_GROWING;
7656       Store[ax-1][ay] = element;
7657       GfxDir[ax-1][ay] = MovDir[ax-1][ay] = MV_LEFT;
7658       if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
7659         DrawGraphic(SCREENX(ax - 1), SCREENY(ay),
7660                     IMG_EXPANDABLE_WALL_GROWING_LEFT, 0);
7661       new_wall = TRUE;
7662     }
7663
7664     if (rechts_frei)
7665     {
7666       Feld[ax+1][ay] = EL_EXPANDABLE_WALL_GROWING;
7667       Store[ax+1][ay] = element;
7668       GfxDir[ax+1][ay] = MovDir[ax+1][ay] = MV_RIGHT;
7669       if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
7670         DrawGraphic(SCREENX(ax + 1), SCREENY(ay),
7671                     IMG_EXPANDABLE_WALL_GROWING_RIGHT, 0);
7672       new_wall = TRUE;
7673     }
7674   }
7675
7676   if (element == EL_EXPANDABLE_WALL && (links_frei || rechts_frei))
7677     DrawLevelField(ax, ay);
7678
7679   if (!IN_LEV_FIELD(ax, ay-1) || IS_WALL(Feld[ax][ay-1]))
7680     oben_massiv = TRUE;
7681   if (!IN_LEV_FIELD(ax, ay+1) || IS_WALL(Feld[ax][ay+1]))
7682     unten_massiv = TRUE;
7683   if (!IN_LEV_FIELD(ax-1, ay) || IS_WALL(Feld[ax-1][ay]))
7684     links_massiv = TRUE;
7685   if (!IN_LEV_FIELD(ax+1, ay) || IS_WALL(Feld[ax+1][ay]))
7686     rechts_massiv = TRUE;
7687
7688   if (((oben_massiv && unten_massiv) ||
7689        element == EL_EXPANDABLE_WALL_HORIZONTAL ||
7690        element == EL_EXPANDABLE_WALL) &&
7691       ((links_massiv && rechts_massiv) ||
7692        element == EL_EXPANDABLE_WALL_VERTICAL))
7693     Feld[ax][ay] = EL_WALL;
7694
7695   if (new_wall)
7696     PlayLevelSoundAction(ax, ay, ACTION_GROWING);
7697 }
7698
7699 void CheckForDragon(int x, int y)
7700 {
7701   int i, j;
7702   boolean dragon_found = FALSE;
7703   static int xy[4][2] =
7704   {
7705     { 0, -1 },
7706     { -1, 0 },
7707     { +1, 0 },
7708     { 0, +1 }
7709   };
7710
7711   for (i = 0; i < NUM_DIRECTIONS; i++)
7712   {
7713     for (j = 0; j < 4; j++)
7714     {
7715       int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
7716
7717       if (IN_LEV_FIELD(xx, yy) &&
7718           (Feld[xx][yy] == EL_FLAMES || Feld[xx][yy] == EL_DRAGON))
7719       {
7720         if (Feld[xx][yy] == EL_DRAGON)
7721           dragon_found = TRUE;
7722       }
7723       else
7724         break;
7725     }
7726   }
7727
7728   if (!dragon_found)
7729   {
7730     for (i = 0; i < NUM_DIRECTIONS; i++)
7731     {
7732       for (j = 0; j < 3; j++)
7733       {
7734         int xx = x + j * xy[i][0], yy = y + j * xy[i][1];
7735
7736         if (IN_LEV_FIELD(xx, yy) && Feld[xx][yy] == EL_FLAMES)
7737         {
7738           Feld[xx][yy] = EL_EMPTY;
7739           DrawLevelField(xx, yy);
7740         }
7741         else
7742           break;
7743       }
7744     }
7745   }
7746 }
7747
7748 static void InitBuggyBase(int x, int y)
7749 {
7750   int element = Feld[x][y];
7751   int activating_delay = FRAMES_PER_SECOND / 4;
7752
7753   ChangeDelay[x][y] =
7754     (element == EL_SP_BUGGY_BASE ?
7755      2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND) - activating_delay :
7756      element == EL_SP_BUGGY_BASE_ACTIVATING ?
7757      activating_delay :
7758      element == EL_SP_BUGGY_BASE_ACTIVE ?
7759      1 * FRAMES_PER_SECOND + RND(1 * FRAMES_PER_SECOND) : 1);
7760 }
7761
7762 static void WarnBuggyBase(int x, int y)
7763 {
7764   int i;
7765   static int xy[4][2] =
7766   {
7767     { 0, -1 },
7768     { -1, 0 },
7769     { +1, 0 },
7770     { 0, +1 }
7771   };
7772
7773   for (i = 0; i < NUM_DIRECTIONS; i++)
7774   {
7775     int xx = x + xy[i][0];
7776     int yy = y + xy[i][1];
7777
7778     if (IN_LEV_FIELD(xx, yy) && IS_PLAYER(xx, yy))
7779     {
7780       PlayLevelSound(x, y, SND_SP_BUGGY_BASE_ACTIVE);
7781
7782       break;
7783     }
7784   }
7785 }
7786
7787 static void InitTrap(int x, int y)
7788 {
7789   ChangeDelay[x][y] = 2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND);
7790 }
7791
7792 static void ActivateTrap(int x, int y)
7793 {
7794   PlayLevelSound(x, y, SND_TRAP_ACTIVATING);
7795 }
7796
7797 static void ChangeActiveTrap(int x, int y)
7798 {
7799   int graphic = IMG_TRAP_ACTIVE;
7800
7801   /* if new animation frame was drawn, correct crumbled sand border */
7802   if (IS_NEW_FRAME(GfxFrame[x][y], graphic))
7803     DrawLevelFieldCrumbledSand(x, y);
7804 }
7805
7806 static int getSpecialActionElement(int element, int number, int base_element)
7807 {
7808   return (element != EL_EMPTY ? element :
7809           number != -1 ? base_element + number - 1 :
7810           EL_EMPTY);
7811 }
7812
7813 static int getModifiedActionNumber(int value_old, int operator, int operand,
7814                                    int value_min, int value_max)
7815 {
7816   int value_new = (operator == CA_MODE_SET      ? operand :
7817                    operator == CA_MODE_ADD      ? value_old + operand :
7818                    operator == CA_MODE_SUBTRACT ? value_old - operand :
7819                    operator == CA_MODE_MULTIPLY ? value_old * operand :
7820                    operator == CA_MODE_DIVIDE   ? value_old / MAX(1, operand) :
7821                    operator == CA_MODE_MODULO   ? value_old % MAX(1, operand) :
7822                    value_old);
7823
7824   return (value_new < value_min ? value_min :
7825           value_new > value_max ? value_max :
7826           value_new);
7827 }
7828
7829 static void ExecuteCustomElementAction(int x, int y, int element, int page)
7830 {
7831   struct ElementInfo *ei = &element_info[element];
7832   struct ElementChangeInfo *change = &ei->change_page[page];
7833   int action_type = change->action_type;
7834   int action_mode = change->action_mode;
7835   int action_arg = change->action_arg;
7836   int i;
7837
7838   if (!change->has_action)
7839     return;
7840
7841   /* ---------- determine action paramater values -------------------------- */
7842
7843   int level_time_value =
7844     (level.time > 0 ? TimeLeft :
7845      TimePlayed);
7846
7847   int action_arg_element =
7848     (action_arg == CA_ARG_PLAYER_TRIGGER  ? change->actual_trigger_player :
7849      action_arg == CA_ARG_ELEMENT_TRIGGER ? change->actual_trigger_element :
7850      action_arg == CA_ARG_ELEMENT_TARGET  ? change->target_element :
7851      EL_EMPTY);
7852
7853   int action_arg_direction =
7854     (action_arg >= CA_ARG_DIRECTION_LEFT &&
7855      action_arg <= CA_ARG_DIRECTION_DOWN ? action_arg - CA_ARG_DIRECTION :
7856      action_arg == CA_ARG_DIRECTION_TRIGGER ?
7857      change->actual_trigger_side :
7858      action_arg == CA_ARG_DIRECTION_TRIGGER_BACK ?
7859      MV_DIR_OPPOSITE(change->actual_trigger_side) :
7860      MV_NONE);
7861
7862   int action_arg_number_min =
7863     (action_type == CA_SET_PLAYER_SPEED ? STEPSIZE_NOT_MOVING :
7864      CA_ARG_MIN);
7865
7866   int action_arg_number_max =
7867     (action_type == CA_SET_PLAYER_SPEED ? STEPSIZE_EVEN_FASTER :
7868      action_type == CA_SET_LEVEL_GEMS ? 999 :
7869      action_type == CA_SET_LEVEL_TIME ? 9999 :
7870      action_type == CA_SET_LEVEL_SCORE ? 99999 :
7871      action_type == CA_SET_CE_SCORE ? 9999 :
7872      action_type == CA_SET_CE_VALUE ? 9999 :
7873      CA_ARG_MAX);
7874
7875   int action_arg_number_reset =
7876     (action_type == CA_SET_PLAYER_SPEED ? level.initial_player_stepsize :
7877      action_type == CA_SET_LEVEL_GEMS ? level.gems_needed :
7878      action_type == CA_SET_LEVEL_TIME ? level.time :
7879      action_type == CA_SET_LEVEL_SCORE ? 0 :
7880      action_type == CA_SET_CE_SCORE ? 0 :
7881 #if 1
7882      action_type == CA_SET_CE_VALUE ? GET_NEW_CUSTOM_VALUE(element) :
7883 #else
7884      action_type == CA_SET_CE_VALUE ? ei->custom_value_initial :
7885 #endif
7886      0);
7887
7888   int action_arg_number =
7889     (action_arg <= CA_ARG_MAX ? action_arg :
7890      action_arg >= CA_ARG_SPEED_NOT_MOVING &&
7891      action_arg <= CA_ARG_SPEED_EVEN_FASTER ? (action_arg - CA_ARG_SPEED) :
7892      action_arg == CA_ARG_SPEED_RESET ? action_arg_number_reset :
7893      action_arg == CA_ARG_NUMBER_MIN ? action_arg_number_min :
7894      action_arg == CA_ARG_NUMBER_MAX ? action_arg_number_max :
7895      action_arg == CA_ARG_NUMBER_RESET ? action_arg_number_reset :
7896      action_arg == CA_ARG_NUMBER_CE_SCORE ? ei->collect_score :
7897 #if USE_NEW_CUSTOM_VALUE
7898      action_arg == CA_ARG_NUMBER_CE_VALUE ? CustomValue[x][y] :
7899 #else
7900      action_arg == CA_ARG_NUMBER_CE_VALUE ? ei->custom_value_initial :
7901 #endif
7902      action_arg == CA_ARG_NUMBER_CE_DELAY ? GET_CE_DELAY_VALUE(change) :
7903      action_arg == CA_ARG_NUMBER_LEVEL_TIME ? level_time_value :
7904      action_arg == CA_ARG_NUMBER_LEVEL_GEMS ? local_player->gems_still_needed :
7905      action_arg == CA_ARG_NUMBER_LEVEL_SCORE ? local_player->score :
7906      action_arg == CA_ARG_ELEMENT_CV_TARGET ? GET_NEW_CUSTOM_VALUE(change->target_element) :
7907      action_arg == CA_ARG_ELEMENT_CV_TRIGGER ? change->actual_trigger_ce_value:
7908      action_arg == CA_ARG_ELEMENT_NR_TARGET  ? change->target_element :
7909      action_arg == CA_ARG_ELEMENT_NR_TRIGGER ? change->actual_trigger_element :
7910      -1);
7911
7912   int action_arg_number_old =
7913     (action_type == CA_SET_LEVEL_GEMS ? local_player->gems_still_needed :
7914      action_type == CA_SET_LEVEL_TIME ? TimeLeft :
7915      action_type == CA_SET_LEVEL_SCORE ? local_player->score :
7916      action_type == CA_SET_CE_SCORE ? ei->collect_score :
7917      action_type == CA_SET_CE_VALUE ? CustomValue[x][y] :
7918      0);
7919
7920   int action_arg_number_new =
7921     getModifiedActionNumber(action_arg_number_old,
7922                             action_mode, action_arg_number,
7923                             action_arg_number_min, action_arg_number_max);
7924
7925   int trigger_player_bits =
7926     (change->actual_trigger_player >= EL_PLAYER_1 &&
7927      change->actual_trigger_player <= EL_PLAYER_4 ?
7928      (1 << (change->actual_trigger_player - EL_PLAYER_1)) :
7929      PLAYER_BITS_ANY);
7930
7931   int action_arg_player_bits =
7932     (action_arg >= CA_ARG_PLAYER_1 &&
7933      action_arg <= CA_ARG_PLAYER_4 ? action_arg - CA_ARG_PLAYER :
7934      action_arg == CA_ARG_PLAYER_TRIGGER ? trigger_player_bits :
7935      PLAYER_BITS_ANY);
7936
7937   /* ---------- execute action  -------------------------------------------- */
7938
7939   switch(action_type)
7940   {
7941     case CA_NO_ACTION:
7942     {
7943       return;
7944     }
7945
7946     /* ---------- level actions  ------------------------------------------- */
7947
7948     case CA_RESTART_LEVEL:
7949     {
7950       game.restart_level = TRUE;
7951
7952       break;
7953     }
7954
7955     case CA_SHOW_ENVELOPE:
7956     {
7957       int element = getSpecialActionElement(action_arg_element,
7958                                             action_arg_number, EL_ENVELOPE_1);
7959
7960       if (IS_ENVELOPE(element))
7961         local_player->show_envelope = element;
7962
7963       break;
7964     }
7965
7966     case CA_SET_LEVEL_TIME:
7967     {
7968       if (level.time > 0)       /* only modify limited time value */
7969       {
7970         TimeLeft = action_arg_number_new;
7971
7972         DrawGameValue_Time(TimeLeft);
7973
7974         if (!TimeLeft && setup.time_limit)
7975           for (i = 0; i < MAX_PLAYERS; i++)
7976             KillPlayer(&stored_player[i]);
7977       }
7978
7979       break;
7980     }
7981
7982     case CA_SET_LEVEL_SCORE:
7983     {
7984       local_player->score = action_arg_number_new;
7985
7986       DrawGameValue_Score(local_player->score);
7987
7988       break;
7989     }
7990
7991     case CA_SET_LEVEL_GEMS:
7992     {
7993       local_player->gems_still_needed = action_arg_number_new;
7994
7995       DrawGameValue_Emeralds(local_player->gems_still_needed);
7996
7997       break;
7998     }
7999
8000     case CA_SET_LEVEL_GRAVITY:
8001     {
8002       game.gravity = (action_arg == CA_ARG_GRAVITY_OFF    ? FALSE         :
8003                       action_arg == CA_ARG_GRAVITY_ON     ? TRUE          :
8004                       action_arg == CA_ARG_GRAVITY_TOGGLE ? !game.gravity :
8005                       game.gravity);
8006       break;
8007     }
8008
8009     case CA_SET_LEVEL_WIND:
8010     {
8011       game.wind_direction = action_arg_direction;
8012
8013       break;
8014     }
8015
8016     /* ---------- player actions  ------------------------------------------ */
8017
8018     case CA_MOVE_PLAYER:
8019     {
8020       /* automatically move to the next field in specified direction */
8021       for (i = 0; i < MAX_PLAYERS; i++)
8022         if (trigger_player_bits & (1 << i))
8023           stored_player[i].programmed_action = action_arg_direction;
8024
8025       break;
8026     }
8027
8028     case CA_EXIT_PLAYER:
8029     {
8030       for (i = 0; i < MAX_PLAYERS; i++)
8031         if (action_arg_player_bits & (1 << i))
8032           stored_player[i].LevelSolved = stored_player[i].GameOver = TRUE;
8033
8034       break;
8035     }
8036
8037     case CA_KILL_PLAYER:
8038     {
8039       for (i = 0; i < MAX_PLAYERS; i++)
8040         if (action_arg_player_bits & (1 << i))
8041           KillPlayer(&stored_player[i]);
8042
8043       break;
8044     }
8045
8046     case CA_SET_PLAYER_KEYS:
8047     {
8048       int key_state = (action_mode == CA_MODE_ADD ? TRUE : FALSE);
8049       int element = getSpecialActionElement(action_arg_element,
8050                                             action_arg_number, EL_KEY_1);
8051
8052       if (IS_KEY(element))
8053       {
8054         for (i = 0; i < MAX_PLAYERS; i++)
8055         {
8056           if (trigger_player_bits & (1 << i))
8057           {
8058             stored_player[i].key[KEY_NR(element)] = key_state;
8059
8060 #if 1
8061             DrawGameDoorValues();
8062 #else
8063             DrawGameValue_Keys(stored_player[i].key);
8064 #endif
8065
8066             redraw_mask |= REDRAW_DOOR_1;
8067           }
8068         }
8069       }
8070
8071       break;
8072     }
8073
8074     case CA_SET_PLAYER_SPEED:
8075     {
8076       for (i = 0; i < MAX_PLAYERS; i++)
8077       {
8078         if (trigger_player_bits & (1 << i))
8079         {
8080           int move_stepsize = TILEX / stored_player[i].move_delay_value;
8081
8082           if (action_arg == CA_ARG_SPEED_FASTER &&
8083               stored_player[i].cannot_move)
8084           {
8085             action_arg_number = STEPSIZE_VERY_SLOW;
8086           }
8087           else if (action_arg == CA_ARG_SPEED_SLOWER ||
8088                    action_arg == CA_ARG_SPEED_FASTER)
8089           {
8090             action_arg_number = 2;
8091             action_mode = (action_arg == CA_ARG_SPEED_SLOWER ? CA_MODE_DIVIDE :
8092                            CA_MODE_MULTIPLY);
8093           }
8094
8095           move_stepsize =
8096             getModifiedActionNumber(move_stepsize,
8097                                     action_mode,
8098                                     action_arg_number,
8099                                     action_arg_number_min,
8100                                     action_arg_number_max);
8101
8102 #if 1
8103           SetPlayerMoveSpeed(&stored_player[i], move_stepsize, FALSE);
8104 #else
8105           /* make sure that value is power of 2 */
8106           move_stepsize = (1 << log_2(move_stepsize));
8107
8108           /* do no immediately change -- the player might just be moving */
8109           stored_player[i].move_delay_value_next = TILEX / move_stepsize;
8110
8111           stored_player[i].cannot_move =
8112             (action_arg == CA_ARG_SPEED_NOT_MOVING ? TRUE : FALSE);
8113 #endif
8114         }
8115       }
8116
8117       break;
8118     }
8119
8120     case CA_SET_PLAYER_SHIELD:
8121     {
8122       for (i = 0; i < MAX_PLAYERS; i++)
8123       {
8124         if (trigger_player_bits & (1 << i))
8125         {
8126           if (action_arg == CA_ARG_SHIELD_OFF)
8127           {
8128             stored_player[i].shield_normal_time_left = 0;
8129             stored_player[i].shield_deadly_time_left = 0;
8130           }
8131           else if (action_arg == CA_ARG_SHIELD_NORMAL)
8132           {
8133             stored_player[i].shield_normal_time_left = 999999;
8134           }
8135           else if (action_arg == CA_ARG_SHIELD_DEADLY)
8136           {
8137             stored_player[i].shield_normal_time_left = 999999;
8138             stored_player[i].shield_deadly_time_left = 999999;
8139           }
8140         }
8141       }
8142
8143       break;
8144     }
8145
8146     case CA_SET_PLAYER_ARTWORK:
8147     {
8148       for (i = 0; i < MAX_PLAYERS; i++)
8149       {
8150         if (trigger_player_bits & (1 << i))
8151         {
8152           int artwork_element = action_arg_element;
8153
8154           if (action_arg == CA_ARG_ELEMENT_RESET)
8155             artwork_element =
8156               (level.use_artwork_element[i] ? level.artwork_element[i] :
8157                stored_player[i].element_nr);
8158
8159           stored_player[i].artwork_element = artwork_element;
8160
8161           SetPlayerWaiting(&stored_player[i], FALSE);
8162
8163           /* set number of special actions for bored and sleeping animation */
8164           stored_player[i].num_special_action_bored =
8165             get_num_special_action(artwork_element,
8166                                    ACTION_BORING_1, ACTION_BORING_LAST);
8167           stored_player[i].num_special_action_sleeping =
8168             get_num_special_action(artwork_element,
8169                                    ACTION_SLEEPING_1, ACTION_SLEEPING_LAST);
8170         }
8171       }
8172
8173       break;
8174     }
8175
8176     /* ---------- CE actions  ---------------------------------------------- */
8177
8178     case CA_SET_CE_SCORE:
8179     {
8180       ei->collect_score = action_arg_number_new;
8181
8182       break;
8183     }
8184
8185     case CA_SET_CE_VALUE:
8186     {
8187 #if USE_NEW_CUSTOM_VALUE
8188       int last_custom_value = CustomValue[x][y];
8189
8190       CustomValue[x][y] = action_arg_number_new;
8191
8192 #if 0
8193       printf("::: Count == %d\n", CustomValue[x][y]);
8194 #endif
8195
8196       if (CustomValue[x][y] == 0 && last_custom_value > 0)
8197       {
8198 #if 0
8199         printf("::: CE_VALUE_GETS_ZERO\n");
8200 #endif
8201
8202         CheckElementChange(x, y, element, EL_UNDEFINED, CE_VALUE_GETS_ZERO);
8203         CheckTriggeredElementChange(x, y, element, CE_VALUE_GETS_ZERO_OF_X);
8204
8205 #if 0
8206         printf("::: RESULT: %d, %d\n", Feld[x][y], ChangePage[x][y]);
8207 #endif
8208       }
8209 #endif
8210
8211       break;
8212     }
8213
8214     /* ---------- engine actions  ------------------------------------------ */
8215
8216     case CA_SET_ENGINE_SCAN_MODE:
8217     {
8218       InitPlayfieldScanMode(action_arg);
8219
8220       break;
8221     }
8222
8223     default:
8224       break;
8225   }
8226 }
8227
8228 static void CreateFieldExt(int x, int y, int element, boolean is_change)
8229 {
8230   int previous_move_direction = MovDir[x][y];
8231 #if USE_NEW_CUSTOM_VALUE
8232   int last_ce_value = CustomValue[x][y];
8233 #endif
8234   boolean add_player = (ELEM_IS_PLAYER(element) &&
8235                         IS_WALKABLE(Feld[x][y]));
8236
8237   /* check if element under player changes from accessible to unaccessible
8238      (needed for special case of dropping element which then changes) */
8239   if (IS_PLAYER(x, y) && !PLAYER_EXPLOSION_PROTECTED(x, y) &&
8240       IS_ACCESSIBLE(Feld[x][y]) && !IS_ACCESSIBLE(element))
8241   {
8242     Bang(x, y);
8243
8244     return;
8245   }
8246
8247   if (!add_player)
8248   {
8249     if (IS_MOVING(x, y) || IS_BLOCKED(x, y))
8250       RemoveMovingField(x, y);
8251     else
8252       RemoveField(x, y);
8253
8254     Feld[x][y] = element;
8255
8256     ResetGfxAnimation(x, y);
8257     ResetRandomAnimationValue(x, y);
8258
8259     if (element_info[Feld[x][y]].move_direction_initial == MV_START_PREVIOUS)
8260       MovDir[x][y] = previous_move_direction;
8261
8262 #if USE_NEW_CUSTOM_VALUE
8263     if (element_info[Feld[x][y]].use_last_ce_value)
8264       CustomValue[x][y] = last_ce_value;
8265 #endif
8266
8267     InitField_WithBug1(x, y, FALSE);
8268
8269     DrawLevelField(x, y);
8270
8271     if (GFX_CRUMBLED(Feld[x][y]))
8272       DrawLevelFieldCrumbledSandNeighbours(x, y);
8273   }
8274
8275   /* "ChangeCount" not set yet to allow "entered by player" change one time */
8276   if (ELEM_IS_PLAYER(element))
8277     RelocatePlayer(x, y, element);
8278
8279   if (is_change)
8280     ChangeCount[x][y]++;        /* count number of changes in the same frame */
8281
8282   TestIfBadThingTouchesPlayer(x, y);
8283   TestIfPlayerTouchesCustomElement(x, y);
8284   TestIfElementTouchesCustomElement(x, y);
8285 }
8286
8287 static void CreateField(int x, int y, int element)
8288 {
8289   CreateFieldExt(x, y, element, FALSE);
8290 }
8291
8292 static void CreateElementFromChange(int x, int y, int element)
8293 {
8294   element = GET_VALID_RUNTIME_ELEMENT(element);
8295
8296 #if USE_STOP_CHANGED_ELEMENTS
8297   if (game.engine_version >= VERSION_IDENT(3,2,0,7))
8298   {
8299     int old_element = Feld[x][y];
8300
8301     /* prevent changed element from moving in same engine frame
8302        unless both old and new element can either fall or move */
8303     if ((!CAN_FALL(old_element) || !CAN_FALL(element)) &&
8304         (!CAN_MOVE(old_element) || !CAN_MOVE(element)))
8305       Stop[x][y] = TRUE;
8306   }
8307 #endif
8308
8309   CreateFieldExt(x, y, element, TRUE);
8310 }
8311
8312 static boolean ChangeElement(int x, int y, int element, int page)
8313 {
8314   struct ElementChangeInfo *change = &element_info[element].change_page[page];
8315   int target_element;
8316   int old_element = Feld[x][y];
8317
8318   /* always use default change event to prevent running into a loop */
8319   if (ChangeEvent[x][y] == -1)
8320     ChangeEvent[x][y] = CE_DELAY;
8321
8322   if (ChangeEvent[x][y] == CE_DELAY)
8323   {
8324     /* reset actual trigger element, trigger player and action element */
8325     change->actual_trigger_element = EL_EMPTY;
8326     change->actual_trigger_player = EL_PLAYER_1;
8327     change->actual_trigger_side = CH_SIDE_NONE;
8328     change->actual_trigger_ce_value = 0;
8329   }
8330
8331   /* do not change elements more than a specified maximum number of changes */
8332   if (ChangeCount[x][y] >= game.max_num_changes_per_frame)
8333     return FALSE;
8334
8335   ChangeCount[x][y]++;          /* count number of changes in the same frame */
8336
8337   if (change->explode)
8338   {
8339     Bang(x, y);
8340
8341     return TRUE;
8342   }
8343
8344   if (change->use_target_content)
8345   {
8346     boolean complete_replace = TRUE;
8347     boolean can_replace[3][3];
8348     int xx, yy;
8349
8350     for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
8351     {
8352       boolean is_empty;
8353       boolean is_walkable;
8354       boolean is_diggable;
8355       boolean is_collectible;
8356       boolean is_removable;
8357       boolean is_destructible;
8358       int ex = x + xx - 1;
8359       int ey = y + yy - 1;
8360       int content_element = change->target_content.e[xx][yy];
8361       int e;
8362
8363       can_replace[xx][yy] = TRUE;
8364
8365       if (ex == x && ey == y)   /* do not check changing element itself */
8366         continue;
8367
8368       if (content_element == EL_EMPTY_SPACE)
8369       {
8370         can_replace[xx][yy] = FALSE;    /* do not replace border with space */
8371
8372         continue;
8373       }
8374
8375       if (!IN_LEV_FIELD(ex, ey))
8376       {
8377         can_replace[xx][yy] = FALSE;
8378         complete_replace = FALSE;
8379
8380         continue;
8381       }
8382
8383       e = Feld[ex][ey];
8384
8385       if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
8386         e = MovingOrBlocked2Element(ex, ey);
8387
8388       is_empty = (IS_FREE(ex, ey) ||
8389                   (IS_FREE_OR_PLAYER(ex, ey) && IS_WALKABLE(content_element)));
8390
8391       is_walkable     = (is_empty || IS_WALKABLE(e));
8392       is_diggable     = (is_empty || IS_DIGGABLE(e));
8393       is_collectible  = (is_empty || IS_COLLECTIBLE(e));
8394       is_destructible = (is_empty || !IS_INDESTRUCTIBLE(e));
8395       is_removable    = (is_diggable || is_collectible);
8396
8397       can_replace[xx][yy] =
8398         (((change->replace_when == CP_WHEN_EMPTY        && is_empty) ||
8399           (change->replace_when == CP_WHEN_WALKABLE     && is_walkable) ||
8400           (change->replace_when == CP_WHEN_DIGGABLE     && is_diggable) ||
8401           (change->replace_when == CP_WHEN_COLLECTIBLE  && is_collectible) ||
8402           (change->replace_when == CP_WHEN_REMOVABLE    && is_removable) ||
8403           (change->replace_when == CP_WHEN_DESTRUCTIBLE && is_destructible)) &&
8404          !(IS_PLAYER(ex, ey) && ELEM_IS_PLAYER(content_element)));
8405
8406       if (!can_replace[xx][yy])
8407         complete_replace = FALSE;
8408     }
8409
8410     if (!change->only_if_complete || complete_replace)
8411     {
8412       boolean something_has_changed = FALSE;
8413
8414       if (change->only_if_complete && change->use_random_replace &&
8415           RND(100) < change->random_percentage)
8416         return FALSE;
8417
8418       for (yy = 0; yy < 3; yy++) for (xx = 0; xx < 3 ; xx++)
8419       {
8420         int ex = x + xx - 1;
8421         int ey = y + yy - 1;
8422         int content_element;
8423
8424         if (can_replace[xx][yy] && (!change->use_random_replace ||
8425                                     RND(100) < change->random_percentage))
8426         {
8427           if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
8428             RemoveMovingField(ex, ey);
8429
8430           ChangeEvent[ex][ey] = ChangeEvent[x][y];
8431
8432           content_element = change->target_content.e[xx][yy];
8433           target_element = GET_TARGET_ELEMENT(content_element, change);
8434
8435           CreateElementFromChange(ex, ey, target_element);
8436
8437           something_has_changed = TRUE;
8438
8439           /* for symmetry reasons, freeze newly created border elements */
8440           if (ex != x || ey != y)
8441             Stop[ex][ey] = TRUE;        /* no more moving in this frame */
8442         }
8443       }
8444
8445       if (something_has_changed)
8446       {
8447         PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
8448         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
8449       }
8450     }
8451   }
8452   else
8453   {
8454     target_element = GET_TARGET_ELEMENT(change->target_element, change);
8455
8456     if (element == EL_DIAGONAL_GROWING ||
8457         element == EL_DIAGONAL_SHRINKING)
8458     {
8459       target_element = Store[x][y];
8460
8461       Store[x][y] = EL_EMPTY;
8462     }
8463
8464     CreateElementFromChange(x, y, target_element);
8465
8466     PlayLevelSoundElementAction(x, y, element, ACTION_CHANGING);
8467     PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + page);
8468   }
8469
8470   /* this uses direct change before indirect change */
8471   CheckTriggeredElementChangeByPage(x, y, old_element, CE_CHANGE_OF_X, page);
8472
8473   return TRUE;
8474 }
8475
8476 #if USE_NEW_DELAYED_ACTION
8477
8478 static void HandleElementChange(int x, int y, int page)
8479 {
8480   int element = MovingOrBlocked2Element(x, y);
8481   struct ElementInfo *ei = &element_info[element];
8482   struct ElementChangeInfo *change = &ei->change_page[page];
8483
8484 #ifdef DEBUG
8485   if (!CAN_CHANGE_OR_HAS_ACTION(element) &&
8486       !CAN_CHANGE_OR_HAS_ACTION(Back[x][y]))
8487   {
8488     printf("\n\n");
8489     printf("HandleElementChange(): %d,%d: element = %d ('%s')\n",
8490            x, y, element, element_info[element].token_name);
8491     printf("HandleElementChange(): This should never happen!\n");
8492     printf("\n\n");
8493   }
8494 #endif
8495
8496   /* this can happen with classic bombs on walkable, changing elements */
8497   if (!CAN_CHANGE_OR_HAS_ACTION(element))
8498   {
8499 #if 0
8500     if (!CAN_CHANGE(Back[x][y]))        /* prevent permanent repetition */
8501       ChangeDelay[x][y] = 0;
8502 #endif
8503
8504     return;
8505   }
8506
8507   if (ChangeDelay[x][y] == 0)           /* initialize element change */
8508   {
8509     ChangeDelay[x][y] = GET_CHANGE_DELAY(change) + 1;
8510
8511     if (change->can_change)
8512     {
8513       ResetGfxAnimation(x, y);
8514       ResetRandomAnimationValue(x, y);
8515
8516       if (change->pre_change_function)
8517         change->pre_change_function(x, y);
8518     }
8519   }
8520
8521   ChangeDelay[x][y]--;
8522
8523   if (ChangeDelay[x][y] != 0)           /* continue element change */
8524   {
8525     if (change->can_change)
8526     {
8527       int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
8528
8529       if (IS_ANIMATED(graphic))
8530         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
8531
8532       if (change->change_function)
8533         change->change_function(x, y);
8534     }
8535   }
8536   else                                  /* finish element change */
8537   {
8538     if (ChangePage[x][y] != -1)         /* remember page from delayed change */
8539     {
8540       page = ChangePage[x][y];
8541       ChangePage[x][y] = -1;
8542
8543       change = &ei->change_page[page];
8544     }
8545
8546     if (IS_MOVING(x, y))                /* never change a running system ;-) */
8547     {
8548       ChangeDelay[x][y] = 1;            /* try change after next move step */
8549       ChangePage[x][y] = page;          /* remember page to use for change */
8550
8551       return;
8552     }
8553
8554     if (change->can_change)
8555     {
8556       if (ChangeElement(x, y, element, page))
8557       {
8558         if (change->post_change_function)
8559           change->post_change_function(x, y);
8560       }
8561     }
8562
8563     if (change->has_action)
8564       ExecuteCustomElementAction(x, y, element, page);
8565   }
8566 }
8567
8568 #else
8569
8570 static void HandleElementChange(int x, int y, int page)
8571 {
8572   int element = MovingOrBlocked2Element(x, y);
8573   struct ElementInfo *ei = &element_info[element];
8574   struct ElementChangeInfo *change = &ei->change_page[page];
8575
8576 #ifdef DEBUG
8577   if (!CAN_CHANGE(element) && !CAN_CHANGE(Back[x][y]))
8578   {
8579     printf("\n\n");
8580     printf("HandleElementChange(): %d,%d: element = %d ('%s')\n",
8581            x, y, element, element_info[element].token_name);
8582     printf("HandleElementChange(): This should never happen!\n");
8583     printf("\n\n");
8584   }
8585 #endif
8586
8587   /* this can happen with classic bombs on walkable, changing elements */
8588   if (!CAN_CHANGE(element))
8589   {
8590 #if 0
8591     if (!CAN_CHANGE(Back[x][y]))        /* prevent permanent repetition */
8592       ChangeDelay[x][y] = 0;
8593 #endif
8594
8595     return;
8596   }
8597
8598   if (ChangeDelay[x][y] == 0)           /* initialize element change */
8599   {
8600     ChangeDelay[x][y] = GET_CHANGE_DELAY(change) + 1;
8601
8602     ResetGfxAnimation(x, y);
8603     ResetRandomAnimationValue(x, y);
8604
8605     if (change->pre_change_function)
8606       change->pre_change_function(x, y);
8607   }
8608
8609   ChangeDelay[x][y]--;
8610
8611   if (ChangeDelay[x][y] != 0)           /* continue element change */
8612   {
8613     int graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
8614
8615     if (IS_ANIMATED(graphic))
8616       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
8617
8618     if (change->change_function)
8619       change->change_function(x, y);
8620   }
8621   else                                  /* finish element change */
8622   {
8623     if (ChangePage[x][y] != -1)         /* remember page from delayed change */
8624     {
8625       page = ChangePage[x][y];
8626       ChangePage[x][y] = -1;
8627
8628       change = &ei->change_page[page];
8629     }
8630
8631     if (IS_MOVING(x, y))                /* never change a running system ;-) */
8632     {
8633       ChangeDelay[x][y] = 1;            /* try change after next move step */
8634       ChangePage[x][y] = page;          /* remember page to use for change */
8635
8636       return;
8637     }
8638
8639     if (ChangeElement(x, y, element, page))
8640     {
8641       if (change->post_change_function)
8642         change->post_change_function(x, y);
8643     }
8644   }
8645 }
8646
8647 #endif
8648
8649 static boolean CheckTriggeredElementChangeExt(int trigger_x, int trigger_y,
8650                                               int trigger_element,
8651                                               int trigger_event,
8652                                               int trigger_player,
8653                                               int trigger_side,
8654                                               int trigger_page)
8655 {
8656   boolean change_done_any = FALSE;
8657   int trigger_page_bits = (trigger_page < 0 ? CH_PAGE_ANY : 1 << trigger_page);
8658   int i;
8659
8660   if (!(trigger_events[trigger_element][trigger_event]))
8661     return FALSE;
8662
8663   for (i = 0; i < NUM_CUSTOM_ELEMENTS; i++)
8664   {
8665     int element = EL_CUSTOM_START + i;
8666     boolean change_done = FALSE;
8667     int p;
8668
8669     if (!CAN_CHANGE_OR_HAS_ACTION(element) ||
8670         !HAS_ANY_CHANGE_EVENT(element, trigger_event))
8671       continue;
8672
8673     for (p = 0; p < element_info[element].num_change_pages; p++)
8674     {
8675       struct ElementChangeInfo *change = &element_info[element].change_page[p];
8676
8677       if (change->can_change_or_has_action &&
8678           change->has_event[trigger_event] &&
8679           change->trigger_side & trigger_side &&
8680           change->trigger_player & trigger_player &&
8681           change->trigger_page & trigger_page_bits &&
8682           IS_EQUAL_OR_IN_GROUP(trigger_element, change->trigger_element))
8683       {
8684         change->actual_trigger_element = trigger_element;
8685         change->actual_trigger_player = EL_PLAYER_1 + log_2(trigger_player);
8686         change->actual_trigger_side = trigger_side;
8687         change->actual_trigger_ce_value = CustomValue[trigger_x][trigger_y];
8688
8689         if ((change->can_change && !change_done) || change->has_action)
8690         {
8691           int x, y;
8692
8693 #if 1
8694           SCAN_PLAYFIELD(x, y)
8695 #else
8696           for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
8697 #endif
8698           {
8699             if (Feld[x][y] == element)
8700             {
8701               if (change->can_change && !change_done)
8702               {
8703                 ChangeDelay[x][y] = 1;
8704                 ChangeEvent[x][y] = trigger_event;
8705
8706                 HandleElementChange(x, y, p);
8707               }
8708 #if USE_NEW_DELAYED_ACTION
8709               else if (change->has_action)
8710               {
8711                 ExecuteCustomElementAction(x, y, element, p);
8712                 PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
8713               }
8714 #else
8715               if (change->has_action)
8716               {
8717                 ExecuteCustomElementAction(x, y, element, p);
8718                 PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
8719               }
8720 #endif
8721             }
8722           }
8723
8724           if (change->can_change)
8725           {
8726             change_done = TRUE;
8727             change_done_any = TRUE;
8728           }
8729         }
8730       }
8731     }
8732   }
8733
8734   return change_done_any;
8735 }
8736
8737 static boolean CheckElementChangeExt(int x, int y,
8738                                      int element,
8739                                      int trigger_element,
8740                                      int trigger_event,
8741                                      int trigger_player,
8742                                      int trigger_side)
8743 {
8744   boolean change_done = FALSE;
8745   int p;
8746
8747   if (!CAN_CHANGE_OR_HAS_ACTION(element) ||
8748       !HAS_ANY_CHANGE_EVENT(element, trigger_event))
8749     return FALSE;
8750
8751   if (Feld[x][y] == EL_BLOCKED)
8752   {
8753     Blocked2Moving(x, y, &x, &y);
8754     element = Feld[x][y];
8755   }
8756
8757 #if 0
8758   /* check if element has already changed */
8759   if (Feld[x][y] != element)
8760     return FALSE;
8761 #else
8762   /* check if element has already changed or is about to change after moving */
8763   if ((game.engine_version < VERSION_IDENT(3,2,0,7) &&
8764        Feld[x][y] != element) ||
8765
8766       (game.engine_version >= VERSION_IDENT(3,2,0,7) &&
8767        (ChangeCount[x][y] >= game.max_num_changes_per_frame ||
8768         ChangePage[x][y] != -1)))
8769     return FALSE;
8770 #endif
8771
8772   for (p = 0; p < element_info[element].num_change_pages; p++)
8773   {
8774     struct ElementChangeInfo *change = &element_info[element].change_page[p];
8775
8776     boolean check_trigger_element =
8777       (trigger_event == CE_TOUCHING_X ||
8778        trigger_event == CE_HITTING_X ||
8779        trigger_event == CE_HIT_BY_X);
8780
8781     if (change->can_change_or_has_action &&
8782         change->has_event[trigger_event] &&
8783         change->trigger_side & trigger_side &&
8784         change->trigger_player & trigger_player &&
8785         (!check_trigger_element ||
8786          IS_EQUAL_OR_IN_GROUP(trigger_element, change->trigger_element)))
8787     {
8788       change->actual_trigger_element = trigger_element;
8789       change->actual_trigger_player = EL_PLAYER_1 + log_2(trigger_player);
8790       change->actual_trigger_side = trigger_side;
8791       change->actual_trigger_ce_value = CustomValue[x][y];
8792
8793       /* special case: trigger element not at (x,y) position for some events */
8794       if (check_trigger_element)
8795       {
8796         static struct
8797         {
8798           int dx, dy;
8799         } move_xy[] =
8800           {
8801             {  0,  0 },
8802             { -1,  0 },
8803             { +1,  0 },
8804             {  0,  0 },
8805             {  0, -1 },
8806             {  0,  0 }, { 0, 0 }, { 0, 0 },
8807             {  0, +1 }
8808           };
8809
8810         int xx = x + move_xy[MV_DIR_OPPOSITE(trigger_side)].dx;
8811         int yy = y + move_xy[MV_DIR_OPPOSITE(trigger_side)].dy;
8812
8813         change->actual_trigger_ce_value = CustomValue[xx][yy];
8814       }
8815
8816       if (change->can_change && !change_done)
8817       {
8818         ChangeDelay[x][y] = 1;
8819         ChangeEvent[x][y] = trigger_event;
8820
8821         HandleElementChange(x, y, p);
8822
8823         change_done = TRUE;
8824       }
8825 #if USE_NEW_DELAYED_ACTION
8826       else if (change->has_action)
8827       {
8828         ExecuteCustomElementAction(x, y, element, p);
8829         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
8830       }
8831 #else
8832       if (change->has_action)
8833       {
8834         ExecuteCustomElementAction(x, y, element, p);
8835         PlayLevelSoundElementAction(x, y, element, ACTION_PAGE_1 + p);
8836       }
8837 #endif
8838     }
8839   }
8840
8841   return change_done;
8842 }
8843
8844 static void PlayPlayerSound(struct PlayerInfo *player)
8845 {
8846   int jx = player->jx, jy = player->jy;
8847   int sound_element = player->artwork_element;
8848   int last_action = player->last_action_waiting;
8849   int action = player->action_waiting;
8850
8851   if (player->is_waiting)
8852   {
8853     if (action != last_action)
8854       PlayLevelSoundElementAction(jx, jy, sound_element, action);
8855     else
8856       PlayLevelSoundElementActionIfLoop(jx, jy, sound_element, action);
8857   }
8858   else
8859   {
8860     if (action != last_action)
8861       StopSound(element_info[sound_element].sound[last_action]);
8862
8863     if (last_action == ACTION_SLEEPING)
8864       PlayLevelSoundElementAction(jx, jy, sound_element, ACTION_AWAKENING);
8865   }
8866 }
8867
8868 static void PlayAllPlayersSound()
8869 {
8870   int i;
8871
8872   for (i = 0; i < MAX_PLAYERS; i++)
8873     if (stored_player[i].active)
8874       PlayPlayerSound(&stored_player[i]);
8875 }
8876
8877 static void SetPlayerWaiting(struct PlayerInfo *player, boolean is_waiting)
8878 {
8879   boolean last_waiting = player->is_waiting;
8880   int move_dir = player->MovDir;
8881
8882   player->dir_waiting = move_dir;
8883   player->last_action_waiting = player->action_waiting;
8884
8885   if (is_waiting)
8886   {
8887     if (!last_waiting)          /* not waiting -> waiting */
8888     {
8889       player->is_waiting = TRUE;
8890
8891       player->frame_counter_bored =
8892         FrameCounter +
8893         game.player_boring_delay_fixed +
8894         SimpleRND(game.player_boring_delay_random);
8895       player->frame_counter_sleeping =
8896         FrameCounter +
8897         game.player_sleeping_delay_fixed +
8898         SimpleRND(game.player_sleeping_delay_random);
8899
8900 #if 1
8901       InitPlayerGfxAnimation(player, ACTION_WAITING, move_dir);
8902 #else
8903       InitPlayerGfxAnimation(player, ACTION_WAITING, player->MovDir);
8904 #endif
8905     }
8906
8907     if (game.player_sleeping_delay_fixed +
8908         game.player_sleeping_delay_random > 0 &&
8909         player->anim_delay_counter == 0 &&
8910         player->post_delay_counter == 0 &&
8911         FrameCounter >= player->frame_counter_sleeping)
8912       player->is_sleeping = TRUE;
8913     else if (game.player_boring_delay_fixed +
8914              game.player_boring_delay_random > 0 &&
8915              FrameCounter >= player->frame_counter_bored)
8916       player->is_bored = TRUE;
8917
8918     player->action_waiting = (player->is_sleeping ? ACTION_SLEEPING :
8919                               player->is_bored ? ACTION_BORING :
8920                               ACTION_WAITING);
8921
8922 #if 1
8923     if (player->is_sleeping && player->use_murphy)
8924     {
8925       /* special case for sleeping Murphy when leaning against non-free tile */
8926
8927       if (!IN_LEV_FIELD(player->jx - 1, player->jy) ||
8928           (Feld[player->jx - 1][player->jy] != EL_EMPTY &&
8929            !IS_MOVING(player->jx - 1, player->jy)))
8930         move_dir = MV_LEFT;
8931       else if (!IN_LEV_FIELD(player->jx + 1, player->jy) ||
8932                (Feld[player->jx + 1][player->jy] != EL_EMPTY &&
8933                 !IS_MOVING(player->jx + 1, player->jy)))
8934         move_dir = MV_RIGHT;
8935       else
8936         player->is_sleeping = FALSE;
8937
8938       player->dir_waiting = move_dir;
8939     }
8940 #endif
8941
8942     if (player->is_sleeping)
8943     {
8944       if (player->num_special_action_sleeping > 0)
8945       {
8946         if (player->anim_delay_counter == 0 && player->post_delay_counter == 0)
8947         {
8948           int last_special_action = player->special_action_sleeping;
8949           int num_special_action = player->num_special_action_sleeping;
8950           int special_action =
8951             (last_special_action == ACTION_DEFAULT ? ACTION_SLEEPING_1 :
8952              last_special_action == ACTION_SLEEPING ? ACTION_SLEEPING :
8953              last_special_action < ACTION_SLEEPING_1 + num_special_action - 1 ?
8954              last_special_action + 1 : ACTION_SLEEPING);
8955           int special_graphic =
8956             el_act_dir2img(player->artwork_element, special_action, move_dir);
8957
8958           player->anim_delay_counter =
8959             graphic_info[special_graphic].anim_delay_fixed +
8960             SimpleRND(graphic_info[special_graphic].anim_delay_random);
8961           player->post_delay_counter =
8962             graphic_info[special_graphic].post_delay_fixed +
8963             SimpleRND(graphic_info[special_graphic].post_delay_random);
8964
8965           player->special_action_sleeping = special_action;
8966         }
8967
8968         if (player->anim_delay_counter > 0)
8969         {
8970           player->action_waiting = player->special_action_sleeping;
8971           player->anim_delay_counter--;
8972         }
8973         else if (player->post_delay_counter > 0)
8974         {
8975           player->post_delay_counter--;
8976         }
8977       }
8978     }
8979     else if (player->is_bored)
8980     {
8981       if (player->num_special_action_bored > 0)
8982       {
8983         if (player->anim_delay_counter == 0 && player->post_delay_counter == 0)
8984         {
8985           int special_action =
8986             ACTION_BORING_1 + SimpleRND(player->num_special_action_bored);
8987           int special_graphic =
8988             el_act_dir2img(player->artwork_element, special_action, move_dir);
8989
8990           player->anim_delay_counter =
8991             graphic_info[special_graphic].anim_delay_fixed +
8992             SimpleRND(graphic_info[special_graphic].anim_delay_random);
8993           player->post_delay_counter =
8994             graphic_info[special_graphic].post_delay_fixed +
8995             SimpleRND(graphic_info[special_graphic].post_delay_random);
8996
8997           player->special_action_bored = special_action;
8998         }
8999
9000         if (player->anim_delay_counter > 0)
9001         {
9002           player->action_waiting = player->special_action_bored;
9003           player->anim_delay_counter--;
9004         }
9005         else if (player->post_delay_counter > 0)
9006         {
9007           player->post_delay_counter--;
9008         }
9009       }
9010     }
9011   }
9012   else if (last_waiting)        /* waiting -> not waiting */
9013   {
9014     player->is_waiting = FALSE;
9015     player->is_bored = FALSE;
9016     player->is_sleeping = FALSE;
9017
9018     player->frame_counter_bored = -1;
9019     player->frame_counter_sleeping = -1;
9020
9021     player->anim_delay_counter = 0;
9022     player->post_delay_counter = 0;
9023
9024     player->dir_waiting = player->MovDir;
9025     player->action_waiting = ACTION_DEFAULT;
9026
9027     player->special_action_bored = ACTION_DEFAULT;
9028     player->special_action_sleeping = ACTION_DEFAULT;
9029   }
9030 }
9031
9032 static byte PlayerActions(struct PlayerInfo *player, byte player_action)
9033 {
9034   boolean moved = FALSE, snapped = FALSE, dropped = FALSE;
9035   int left      = player_action & JOY_LEFT;
9036   int right     = player_action & JOY_RIGHT;
9037   int up        = player_action & JOY_UP;
9038   int down      = player_action & JOY_DOWN;
9039   int button1   = player_action & JOY_BUTTON_1;
9040   int button2   = player_action & JOY_BUTTON_2;
9041   int dx        = (left ? -1 : right ? 1 : 0);
9042   int dy        = (up   ? -1 : down  ? 1 : 0);
9043
9044   if (!player->active || tape.pausing)
9045     return 0;
9046
9047   if (player_action)
9048   {
9049     if (button1)
9050       snapped = SnapField(player, dx, dy);
9051     else
9052     {
9053       if (button2)
9054         dropped = DropElement(player);
9055
9056       moved = MovePlayer(player, dx, dy);
9057     }
9058
9059     if (tape.single_step && tape.recording && !tape.pausing)
9060     {
9061       if (button1 || (dropped && !moved))
9062       {
9063         TapeTogglePause(TAPE_TOGGLE_AUTOMATIC);
9064         SnapField(player, 0, 0);                /* stop snapping */
9065       }
9066     }
9067
9068     SetPlayerWaiting(player, FALSE);
9069
9070     return player_action;
9071   }
9072   else
9073   {
9074     /* no actions for this player (no input at player's configured device) */
9075
9076     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
9077     SnapField(player, 0, 0);
9078     CheckGravityMovementWhenNotMoving(player);
9079
9080     if (player->MovPos == 0)
9081       SetPlayerWaiting(player, TRUE);
9082
9083     if (player->MovPos == 0)    /* needed for tape.playing */
9084       player->is_moving = FALSE;
9085
9086     player->is_dropping = FALSE;
9087     player->is_dropping_pressed = FALSE;
9088     player->drop_pressed_delay = 0;
9089
9090     return 0;
9091   }
9092 }
9093
9094 static void CheckLevelTime()
9095 {
9096   int i;
9097
9098   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
9099   {
9100     if (level.native_em_level->lev->home == 0)  /* all players at home */
9101     {
9102       local_player->LevelSolved = TRUE;
9103       AllPlayersGone = TRUE;
9104
9105       level.native_em_level->lev->home = -1;
9106     }
9107
9108     if (level.native_em_level->ply[0]->alive == 0 &&
9109         level.native_em_level->ply[1]->alive == 0 &&
9110         level.native_em_level->ply[2]->alive == 0 &&
9111         level.native_em_level->ply[3]->alive == 0)      /* all dead */
9112       AllPlayersGone = TRUE;
9113   }
9114
9115   if (TimeFrames >= FRAMES_PER_SECOND)
9116   {
9117     TimeFrames = 0;
9118     TapeTime++;
9119
9120     for (i = 0; i < MAX_PLAYERS; i++)
9121     {
9122       struct PlayerInfo *player = &stored_player[i];
9123
9124       if (SHIELD_ON(player))
9125       {
9126         player->shield_normal_time_left--;
9127
9128         if (player->shield_deadly_time_left > 0)
9129           player->shield_deadly_time_left--;
9130       }
9131     }
9132
9133     if (!level.use_step_counter)
9134     {
9135       TimePlayed++;
9136
9137       if (TimeLeft > 0)
9138       {
9139         TimeLeft--;
9140
9141         if (TimeLeft <= 10 && setup.time_limit)
9142           PlaySoundStereo(SND_GAME_RUNNING_OUT_OF_TIME, SOUND_MIDDLE);
9143
9144         DrawGameValue_Time(TimeLeft);
9145
9146         if (!TimeLeft && setup.time_limit)
9147         {
9148           if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
9149             level.native_em_level->lev->killed_out_of_time = TRUE;
9150           else
9151             for (i = 0; i < MAX_PLAYERS; i++)
9152               KillPlayer(&stored_player[i]);
9153         }
9154       }
9155       else if (level.time == 0 && !AllPlayersGone) /* level w/o time limit */
9156         DrawGameValue_Time(TimePlayed);
9157
9158       level.native_em_level->lev->time =
9159         (level.time == 0 ? TimePlayed : TimeLeft);
9160     }
9161
9162     if (tape.recording || tape.playing)
9163       DrawVideoDisplay(VIDEO_STATE_TIME_ON, TapeTime);
9164   }
9165 }
9166
9167 void AdvanceFrameAndPlayerCounters(int player_nr)
9168 {
9169   int i;
9170
9171   /* advance frame counters (global frame counter and time frame counter) */
9172   FrameCounter++;
9173   TimeFrames++;
9174
9175   /* advance player counters (counters for move delay, move animation etc.) */
9176   for (i = 0; i < MAX_PLAYERS; i++)
9177   {
9178     boolean advance_player_counters = (player_nr == -1 || player_nr == i);
9179     int move_delay_value = stored_player[i].move_delay_value;
9180     int move_frames = MOVE_DELAY_NORMAL_SPEED / move_delay_value;
9181
9182     if (!advance_player_counters)       /* not all players may be affected */
9183       continue;
9184
9185 #if USE_NEW_PLAYER_ANIM
9186     if (move_frames == 0)       /* less than one move per game frame */
9187     {
9188       int stepsize = TILEX / move_delay_value;
9189       int delay = move_delay_value / MOVE_DELAY_NORMAL_SPEED;
9190       int count = (stored_player[i].is_moving ?
9191                    ABS(stored_player[i].MovPos) / stepsize : FrameCounter);
9192
9193       if (count % delay == 0)
9194         move_frames = 1;
9195     }
9196 #endif
9197
9198     stored_player[i].Frame += move_frames;
9199
9200     if (stored_player[i].MovPos != 0)
9201       stored_player[i].StepFrame += move_frames;
9202
9203     if (stored_player[i].move_delay > 0)
9204       stored_player[i].move_delay--;
9205
9206     /* due to bugs in previous versions, counter must count up, not down */
9207     if (stored_player[i].push_delay != -1)
9208       stored_player[i].push_delay++;
9209
9210     if (stored_player[i].drop_delay > 0)
9211       stored_player[i].drop_delay--;
9212
9213     if (stored_player[i].is_dropping_pressed)
9214       stored_player[i].drop_pressed_delay++;
9215   }
9216 }
9217
9218 void StartGameActions(boolean init_network_game, boolean record_tape,
9219                       long random_seed)
9220 {
9221 #if 1
9222   unsigned long new_random_seed = InitRND(random_seed);
9223
9224   if (record_tape)
9225     TapeStartRecording(new_random_seed);
9226 #else
9227   if (record_tape)
9228     TapeStartRecording(random_seed);
9229 #endif
9230
9231 #if defined(NETWORK_AVALIABLE)
9232   if (init_network_game)
9233   {
9234     SendToServer_StartPlaying();
9235
9236     return;
9237   }
9238 #endif
9239
9240   StopAnimation();
9241
9242   game_status = GAME_MODE_PLAYING;
9243
9244 #if 0
9245   InitRND(random_seed);
9246 #endif
9247
9248   InitGame();
9249 }
9250
9251 void GameActions()
9252 {
9253   static unsigned long game_frame_delay = 0;
9254   unsigned long game_frame_delay_value;
9255   byte *recorded_player_action;
9256   byte summarized_player_action = 0;
9257   byte tape_action[MAX_PLAYERS];
9258   int i;
9259
9260   if (game.restart_level)
9261     StartGameActions(options.network, setup.autorecord, NEW_RANDOMIZE);
9262
9263   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
9264   {
9265     if (level.native_em_level->lev->home == 0)  /* all players at home */
9266     {
9267       local_player->LevelSolved = TRUE;
9268       AllPlayersGone = TRUE;
9269
9270       level.native_em_level->lev->home = -1;
9271     }
9272
9273     if (level.native_em_level->ply[0]->alive == 0 &&
9274         level.native_em_level->ply[1]->alive == 0 &&
9275         level.native_em_level->ply[2]->alive == 0 &&
9276         level.native_em_level->ply[3]->alive == 0)      /* all dead */
9277       AllPlayersGone = TRUE;
9278   }
9279
9280   if (local_player->LevelSolved)
9281     GameWon();
9282
9283   if (AllPlayersGone && !TAPE_IS_STOPPED(tape))
9284     TapeStop();
9285
9286   if (game_status != GAME_MODE_PLAYING)         /* status might have changed */
9287     return;
9288
9289   game_frame_delay_value =
9290     (tape.playing && tape.fast_forward ? FfwdFrameDelay : GameFrameDelay);
9291
9292   if (tape.playing && tape.warp_forward && !tape.pausing)
9293     game_frame_delay_value = 0;
9294
9295   /* ---------- main game synchronization point ---------- */
9296
9297   WaitUntilDelayReached(&game_frame_delay, game_frame_delay_value);
9298
9299   if (network_playing && !network_player_action_received)
9300   {
9301     /* try to get network player actions in time */
9302
9303 #if defined(NETWORK_AVALIABLE)
9304     /* last chance to get network player actions without main loop delay */
9305     HandleNetworking();
9306 #endif
9307
9308     /* game was quit by network peer */
9309     if (game_status != GAME_MODE_PLAYING)
9310       return;
9311
9312     if (!network_player_action_received)
9313       return;           /* failed to get network player actions in time */
9314   }
9315
9316   if (tape.pausing)
9317     return;
9318
9319   recorded_player_action = (tape.playing ? TapePlayAction() : NULL);
9320
9321   if (tape.set_centered_player)
9322   {
9323     game.centered_player_nr_next = tape.centered_player_nr_next;
9324     game.set_centered_player = TRUE;
9325   }
9326
9327   for (i = 0; i < MAX_PLAYERS; i++)
9328   {
9329     summarized_player_action |= stored_player[i].action;
9330
9331     if (!network_playing)
9332       stored_player[i].effective_action = stored_player[i].action;
9333   }
9334
9335 #if defined(NETWORK_AVALIABLE)
9336   if (network_playing)
9337     SendToServer_MovePlayer(summarized_player_action);
9338 #endif
9339
9340   if (!options.network && !setup.team_mode)
9341     local_player->effective_action = summarized_player_action;
9342
9343   if (setup.team_mode && setup.input_on_focus && game.centered_player_nr != -1)
9344   {
9345     for (i = 0; i < MAX_PLAYERS; i++)
9346       stored_player[i].effective_action =
9347         (i == game.centered_player_nr ? summarized_player_action : 0);
9348   }
9349
9350   if (recorded_player_action != NULL)
9351     for (i = 0; i < MAX_PLAYERS; i++)
9352       stored_player[i].effective_action = recorded_player_action[i];
9353
9354   for (i = 0; i < MAX_PLAYERS; i++)
9355   {
9356     tape_action[i] = stored_player[i].effective_action;
9357
9358     /* (this can only happen in the R'n'D game engine) */
9359     if (tape.recording && tape_action[i] && !tape.player_participates[i])
9360       tape.player_participates[i] = TRUE;    /* player just appeared from CE */
9361   }
9362
9363   /* only record actions from input devices, but not programmed actions */
9364   if (tape.recording)
9365     TapeRecordAction(tape_action);
9366
9367   if (level.game_engine_type == GAME_ENGINE_TYPE_EM)
9368   {
9369     GameActions_EM_Main();
9370   }
9371   else
9372   {
9373     GameActions_RND();
9374   }
9375 }
9376
9377 void GameActions_EM_Main()
9378 {
9379   byte effective_action[MAX_PLAYERS];
9380   boolean warp_mode = (tape.playing && tape.warp_forward && !tape.pausing);
9381   int i;
9382
9383   for (i = 0; i < MAX_PLAYERS; i++)
9384     effective_action[i] = stored_player[i].effective_action;
9385
9386   GameActions_EM(effective_action, warp_mode);
9387
9388   CheckLevelTime();
9389
9390   AdvanceFrameAndPlayerCounters(-1);    /* advance counters for all players */
9391 }
9392
9393 void GameActions_RND()
9394 {
9395   int magic_wall_x = 0, magic_wall_y = 0;
9396   int i, x, y, element, graphic;
9397
9398   InitPlayfieldScanModeVars();
9399
9400 #if USE_ONE_MORE_CHANGE_PER_FRAME
9401   if (game.engine_version >= VERSION_IDENT(3,2,0,7))
9402   {
9403     SCAN_PLAYFIELD(x, y)
9404     {
9405       ChangeCount[x][y] = 0;
9406       ChangeEvent[x][y] = -1;
9407     }
9408   }
9409 #endif
9410
9411 #if 1
9412   if (game.set_centered_player)
9413   {
9414     boolean all_players_fit_to_screen = checkIfAllPlayersFitToScreen_RND();
9415
9416     /* switching to "all players" only possible if all players fit to screen */
9417     if (game.centered_player_nr_next == -1 && !all_players_fit_to_screen)
9418     {
9419       game.centered_player_nr_next = game.centered_player_nr;
9420       game.set_centered_player = FALSE;
9421     }
9422
9423     /* do not switch focus to non-existing (or non-active) player */
9424     if (game.centered_player_nr_next >= 0 &&
9425         !stored_player[game.centered_player_nr_next].active)
9426     {
9427       game.centered_player_nr_next = game.centered_player_nr;
9428       game.set_centered_player = FALSE;
9429     }
9430   }
9431
9432   if (game.set_centered_player &&
9433       ScreenMovPos == 0)        /* screen currently aligned at tile position */
9434   {
9435     int sx, sy;
9436
9437     if (game.centered_player_nr_next == -1)
9438     {
9439       setScreenCenteredToAllPlayers(&sx, &sy);
9440     }
9441     else
9442     {
9443       sx = stored_player[game.centered_player_nr_next].jx;
9444       sy = stored_player[game.centered_player_nr_next].jy;
9445     }
9446
9447     game.centered_player_nr = game.centered_player_nr_next;
9448     game.set_centered_player = FALSE;
9449
9450     DrawRelocateScreen(sx, sy, MV_NONE, TRUE, setup.quick_switch);
9451     DrawGameDoorValues();
9452   }
9453 #endif
9454
9455   for (i = 0; i < MAX_PLAYERS; i++)
9456   {
9457     int actual_player_action = stored_player[i].effective_action;
9458
9459 #if 1
9460     /* !!! THIS BREAKS THE FOLLOWING TAPES: !!!
9461        - rnd_equinox_tetrachloride 048
9462        - rnd_equinox_tetrachloride_ii 096
9463        - rnd_emanuel_schmieg 002
9464        - doctor_sloan_ww 001, 020
9465     */
9466     if (stored_player[i].MovPos == 0)
9467       CheckGravityMovement(&stored_player[i]);
9468 #endif
9469
9470     /* overwrite programmed action with tape action */
9471     if (stored_player[i].programmed_action)
9472       actual_player_action = stored_player[i].programmed_action;
9473
9474 #if 1
9475     PlayerActions(&stored_player[i], actual_player_action);
9476 #else
9477     tape_action[i] = PlayerActions(&stored_player[i], actual_player_action);
9478
9479     if (tape.recording && tape_action[i] && !tape.player_participates[i])
9480       tape.player_participates[i] = TRUE;    /* player just appeared from CE */
9481 #endif
9482
9483     ScrollPlayer(&stored_player[i], SCROLL_GO_ON);
9484   }
9485
9486   network_player_action_received = FALSE;
9487
9488   ScrollScreen(NULL, SCROLL_GO_ON);
9489
9490   /* for backwards compatibility, the following code emulates a fixed bug that
9491      occured when pushing elements (causing elements that just made their last
9492      pushing step to already (if possible) make their first falling step in the
9493      same game frame, which is bad); this code is also needed to use the famous
9494      "spring push bug" which is used in older levels and might be wanted to be
9495      used also in newer levels, but in this case the buggy pushing code is only
9496      affecting the "spring" element and no other elements */
9497
9498   if (game.engine_version < VERSION_IDENT(2,2,0,7) || level.use_spring_bug)
9499   {
9500     for (i = 0; i < MAX_PLAYERS; i++)
9501     {
9502       struct PlayerInfo *player = &stored_player[i];
9503       int x = player->jx;
9504       int y = player->jy;
9505
9506       if (player->active && player->is_pushing && player->is_moving &&
9507           IS_MOVING(x, y) &&
9508           (game.engine_version < VERSION_IDENT(2,2,0,7) ||
9509            Feld[x][y] == EL_SPRING))
9510       {
9511         ContinueMoving(x, y);
9512
9513         /* continue moving after pushing (this is actually a bug) */
9514         if (!IS_MOVING(x, y))
9515         {
9516           Stop[x][y] = FALSE;
9517         }
9518       }
9519     }
9520   }
9521
9522 #if 1
9523   SCAN_PLAYFIELD(x, y)
9524 #else
9525   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
9526 #endif
9527   {
9528     ChangeCount[x][y] = 0;
9529     ChangeEvent[x][y] = -1;
9530
9531     /* this must be handled before main playfield loop */
9532     if (Feld[x][y] == EL_PLAYER_IS_LEAVING)
9533     {
9534       MovDelay[x][y]--;
9535       if (MovDelay[x][y] <= 0)
9536         RemoveField(x, y);
9537     }
9538
9539 #if USE_NEW_SNAP_DELAY
9540     if (Feld[x][y] == EL_ELEMENT_SNAPPING)
9541     {
9542       MovDelay[x][y]--;
9543       if (MovDelay[x][y] <= 0)
9544       {
9545         RemoveField(x, y);
9546         DrawLevelField(x, y);
9547
9548         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
9549       }
9550     }
9551 #endif
9552
9553 #if DEBUG
9554     if (ChangePage[x][y] != -1 && ChangeDelay[x][y] != 1)
9555     {
9556       printf("GameActions(): x = %d, y = %d: ChangePage != -1\n", x, y);
9557       printf("GameActions(): This should never happen!\n");
9558
9559       ChangePage[x][y] = -1;
9560     }
9561 #endif
9562
9563     Stop[x][y] = FALSE;
9564     if (WasJustMoving[x][y] > 0)
9565       WasJustMoving[x][y]--;
9566     if (WasJustFalling[x][y] > 0)
9567       WasJustFalling[x][y]--;
9568     if (CheckCollision[x][y] > 0)
9569       CheckCollision[x][y]--;
9570
9571     GfxFrame[x][y]++;
9572
9573     /* reset finished pushing action (not done in ContinueMoving() to allow
9574        continuous pushing animation for elements with zero push delay) */
9575     if (GfxAction[x][y] == ACTION_PUSHING && !IS_MOVING(x, y))
9576     {
9577       ResetGfxAnimation(x, y);
9578       DrawLevelField(x, y);
9579     }
9580
9581 #if DEBUG
9582     if (IS_BLOCKED(x, y))
9583     {
9584       int oldx, oldy;
9585
9586       Blocked2Moving(x, y, &oldx, &oldy);
9587       if (!IS_MOVING(oldx, oldy))
9588       {
9589         printf("GameActions(): (BLOCKED => MOVING) context corrupted!\n");
9590         printf("GameActions(): BLOCKED: x = %d, y = %d\n", x, y);
9591         printf("GameActions(): !MOVING: oldx = %d, oldy = %d\n", oldx, oldy);
9592         printf("GameActions(): This should never happen!\n");
9593       }
9594     }
9595 #endif
9596   }
9597
9598 #if 1
9599   SCAN_PLAYFIELD(x, y)
9600 #else
9601   for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
9602 #endif
9603   {
9604     element = Feld[x][y];
9605     graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
9606
9607 #if 0
9608     printf("::: %d,%d\n", x, y);
9609
9610     if (element == EL_ROCK)
9611       printf("::: Yo man! Rocks can fall!\n");
9612 #endif
9613
9614     if (graphic_info[graphic].anim_global_sync)
9615       GfxFrame[x][y] = FrameCounter;
9616     else if (ANIM_MODE(graphic) == ANIM_CE_VALUE)
9617     {
9618       int old_gfx_frame = GfxFrame[x][y];
9619
9620       GfxFrame[x][y] = CustomValue[x][y];
9621
9622 #if 1
9623       if (GfxFrame[x][y] != old_gfx_frame)
9624 #endif
9625         DrawLevelGraphicAnimation(x, y, graphic);
9626     }
9627     else if (ANIM_MODE(graphic) == ANIM_CE_SCORE)
9628     {
9629       int old_gfx_frame = GfxFrame[x][y];
9630
9631       GfxFrame[x][y] = element_info[element].collect_score;
9632
9633 #if 1
9634       if (GfxFrame[x][y] != old_gfx_frame)
9635 #endif
9636         DrawLevelGraphicAnimation(x, y, graphic);
9637     }
9638
9639     if (ANIM_MODE(graphic) == ANIM_RANDOM &&
9640         IS_NEXT_FRAME(GfxFrame[x][y], graphic))
9641       ResetRandomAnimationValue(x, y);
9642
9643     SetRandomAnimationValue(x, y);
9644
9645     PlayLevelSoundActionIfLoop(x, y, GfxAction[x][y]);
9646
9647     if (IS_INACTIVE(element))
9648     {
9649       if (IS_ANIMATED(graphic))
9650         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9651
9652       continue;
9653     }
9654
9655     /* this may take place after moving, so 'element' may have changed */
9656     if (IS_CHANGING(x, y) &&
9657         (game.engine_version < VERSION_IDENT(3,0,7,1) || !Stop[x][y]))
9658     {
9659       int page = element_info[element].event_page_nr[CE_DELAY];
9660 #if 0
9661       HandleElementChange(x, y, ChangePage[x][y] != -1 ? ChangePage[x][y] : page);
9662 #else
9663
9664 #if 0
9665       printf("::: ChangeDelay == %d\n", ChangeDelay[x][y]);
9666 #endif
9667
9668 #if 0
9669       if (element == EL_CUSTOM_255)
9670         printf("::: ChangeDelay == %d\n", ChangeDelay[x][y]);
9671 #endif
9672
9673 #if 1
9674       HandleElementChange(x, y, page);
9675 #else
9676       if (CAN_CHANGE(element))
9677         HandleElementChange(x, y, page);
9678
9679       if (HAS_ACTION(element))
9680         ExecuteCustomElementAction(x, y, element, page);
9681 #endif
9682
9683 #endif
9684
9685       element = Feld[x][y];
9686       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
9687     }
9688
9689     if (!IS_MOVING(x, y) && (CAN_FALL(element) || CAN_MOVE(element)))
9690     {
9691       StartMoving(x, y);
9692
9693       element = Feld[x][y];
9694       graphic = el_act_dir2img(element, GfxAction[x][y], GfxDir[x][y]);
9695
9696       if (IS_ANIMATED(graphic) &&
9697           !IS_MOVING(x, y) &&
9698           !Stop[x][y])
9699         DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9700
9701       if (IS_GEM(element) || element == EL_SP_INFOTRON)
9702         EdelsteinFunkeln(x, y);
9703     }
9704     else if ((element == EL_ACID ||
9705               element == EL_EXIT_OPEN ||
9706               element == EL_SP_EXIT_OPEN ||
9707               element == EL_SP_TERMINAL ||
9708               element == EL_SP_TERMINAL_ACTIVE ||
9709               element == EL_EXTRA_TIME ||
9710               element == EL_SHIELD_NORMAL ||
9711               element == EL_SHIELD_DEADLY) &&
9712              IS_ANIMATED(graphic))
9713       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9714     else if (IS_MOVING(x, y))
9715       ContinueMoving(x, y);
9716     else if (IS_ACTIVE_BOMB(element))
9717       CheckDynamite(x, y);
9718     else if (element == EL_AMOEBA_GROWING)
9719       AmoebeWaechst(x, y);
9720     else if (element == EL_AMOEBA_SHRINKING)
9721       AmoebaDisappearing(x, y);
9722
9723 #if !USE_NEW_AMOEBA_CODE
9724     else if (IS_AMOEBALIVE(element))
9725       AmoebeAbleger(x, y);
9726 #endif
9727
9728     else if (element == EL_GAME_OF_LIFE || element == EL_BIOMAZE)
9729       Life(x, y);
9730     else if (element == EL_EXIT_CLOSED)
9731       CheckExit(x, y);
9732     else if (element == EL_SP_EXIT_CLOSED)
9733       CheckExitSP(x, y);
9734     else if (element == EL_EXPANDABLE_WALL_GROWING)
9735       MauerWaechst(x, y);
9736     else if (element == EL_EXPANDABLE_WALL ||
9737              element == EL_EXPANDABLE_WALL_HORIZONTAL ||
9738              element == EL_EXPANDABLE_WALL_VERTICAL ||
9739              element == EL_EXPANDABLE_WALL_ANY)
9740       MauerAbleger(x, y);
9741     else if (element == EL_FLAMES)
9742       CheckForDragon(x, y);
9743     else if (element == EL_EXPLOSION)
9744       ; /* drawing of correct explosion animation is handled separately */
9745     else if (element == EL_ELEMENT_SNAPPING ||
9746              element == EL_DIAGONAL_SHRINKING ||
9747              element == EL_DIAGONAL_GROWING)
9748     {
9749 #if 1
9750       graphic = el_act_dir2img(GfxElement[x][y], GfxAction[x][y],GfxDir[x][y]);
9751
9752       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9753 #endif
9754     }
9755     else if (IS_ANIMATED(graphic) && !IS_CHANGING(x, y))
9756       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
9757
9758 #if 0
9759     if (element == EL_CUSTOM_255 ||
9760         element == EL_CUSTOM_256)
9761       DrawLevelGraphicAnimation(x, y, graphic);
9762 #endif
9763
9764     if (IS_BELT_ACTIVE(element))
9765       PlayLevelSoundAction(x, y, ACTION_ACTIVE);
9766
9767     if (game.magic_wall_active)
9768     {
9769       int jx = local_player->jx, jy = local_player->jy;
9770
9771       /* play the element sound at the position nearest to the player */
9772       if ((element == EL_MAGIC_WALL_FULL ||
9773            element == EL_MAGIC_WALL_ACTIVE ||
9774            element == EL_MAGIC_WALL_EMPTYING ||
9775            element == EL_BD_MAGIC_WALL_FULL ||
9776            element == EL_BD_MAGIC_WALL_ACTIVE ||
9777            element == EL_BD_MAGIC_WALL_EMPTYING) &&
9778           ABS(x-jx) + ABS(y-jy) < ABS(magic_wall_x-jx) + ABS(magic_wall_y-jy))
9779       {
9780         magic_wall_x = x;
9781         magic_wall_y = y;
9782       }
9783     }
9784   }
9785
9786 #if USE_NEW_AMOEBA_CODE
9787   /* new experimental amoeba growth stuff */
9788   if (!(FrameCounter % 8))
9789   {
9790     static unsigned long random = 1684108901;
9791
9792     for (i = 0; i < level.amoeba_speed * 28 / 8; i++)
9793     {
9794       x = RND(lev_fieldx);
9795       y = RND(lev_fieldy);
9796       element = Feld[x][y];
9797
9798       if (!IS_PLAYER(x,y) &&
9799           (element == EL_EMPTY ||
9800            CAN_GROW_INTO(element) ||
9801            element == EL_QUICKSAND_EMPTY ||
9802            element == EL_ACID_SPLASH_LEFT ||
9803            element == EL_ACID_SPLASH_RIGHT))
9804       {
9805         if ((IN_LEV_FIELD(x, y-1) && Feld[x][y-1] == EL_AMOEBA_WET) ||
9806             (IN_LEV_FIELD(x-1, y) && Feld[x-1][y] == EL_AMOEBA_WET) ||
9807             (IN_LEV_FIELD(x+1, y) && Feld[x+1][y] == EL_AMOEBA_WET) ||
9808             (IN_LEV_FIELD(x, y+1) && Feld[x][y+1] == EL_AMOEBA_WET))
9809           Feld[x][y] = EL_AMOEBA_DROP;
9810       }
9811
9812       random = random * 129 + 1;
9813     }
9814   }
9815 #endif
9816
9817 #if 0
9818   if (game.explosions_delayed)
9819 #endif
9820   {
9821     game.explosions_delayed = FALSE;
9822
9823 #if 1
9824     SCAN_PLAYFIELD(x, y)
9825 #else
9826     for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
9827 #endif
9828     {
9829       element = Feld[x][y];
9830
9831       if (ExplodeField[x][y])
9832         Explode(x, y, EX_PHASE_START, ExplodeField[x][y]);
9833       else if (element == EL_EXPLOSION)
9834         Explode(x, y, ExplodePhase[x][y], EX_TYPE_NORMAL);
9835
9836       ExplodeField[x][y] = EX_TYPE_NONE;
9837     }
9838
9839     game.explosions_delayed = TRUE;
9840   }
9841
9842   if (game.magic_wall_active)
9843   {
9844     if (!(game.magic_wall_time_left % 4))
9845     {
9846       int element = Feld[magic_wall_x][magic_wall_y];
9847
9848       if (element == EL_BD_MAGIC_WALL_FULL ||
9849           element == EL_BD_MAGIC_WALL_ACTIVE ||
9850           element == EL_BD_MAGIC_WALL_EMPTYING)
9851         PlayLevelSound(magic_wall_x, magic_wall_y, SND_BD_MAGIC_WALL_ACTIVE);
9852       else
9853         PlayLevelSound(magic_wall_x, magic_wall_y, SND_MAGIC_WALL_ACTIVE);
9854     }
9855
9856     if (game.magic_wall_time_left > 0)
9857     {
9858       game.magic_wall_time_left--;
9859       if (!game.magic_wall_time_left)
9860       {
9861 #if 1
9862         SCAN_PLAYFIELD(x, y)
9863 #else
9864         for (y = 0; y < lev_fieldy; y++) for (x = 0; x < lev_fieldx; x++)
9865 #endif
9866         {
9867           element = Feld[x][y];
9868
9869           if (element == EL_MAGIC_WALL_ACTIVE ||
9870               element == EL_MAGIC_WALL_FULL)
9871           {
9872             Feld[x][y] = EL_MAGIC_WALL_DEAD;
9873             DrawLevelField(x, y);
9874           }
9875           else if (element == EL_BD_MAGIC_WALL_ACTIVE ||
9876                    element == EL_BD_MAGIC_WALL_FULL)
9877           {
9878             Feld[x][y] = EL_BD_MAGIC_WALL_DEAD;
9879             DrawLevelField(x, y);
9880           }
9881         }
9882
9883         game.magic_wall_active = FALSE;
9884       }
9885     }
9886   }
9887
9888   if (game.light_time_left > 0)
9889   {
9890     game.light_time_left--;
9891
9892     if (game.light_time_left == 0)
9893       RedrawAllLightSwitchesAndInvisibleElements();
9894   }
9895
9896   if (game.timegate_time_left > 0)
9897   {
9898     game.timegate_time_left--;
9899
9900     if (game.timegate_time_left == 0)
9901       CloseAllOpenTimegates();
9902   }
9903
9904   if (game.lenses_time_left > 0)
9905   {
9906     game.lenses_time_left--;
9907
9908     if (game.lenses_time_left == 0)
9909       RedrawAllInvisibleElementsForLenses();
9910   }
9911
9912   if (game.magnify_time_left > 0)
9913   {
9914     game.magnify_time_left--;
9915
9916     if (game.magnify_time_left == 0)
9917       RedrawAllInvisibleElementsForMagnifier();
9918   }
9919
9920   for (i = 0; i < MAX_PLAYERS; i++)
9921   {
9922     struct PlayerInfo *player = &stored_player[i];
9923
9924     if (SHIELD_ON(player))
9925     {
9926       if (player->shield_deadly_time_left)
9927         PlayLevelSound(player->jx, player->jy, SND_SHIELD_DEADLY_ACTIVE);
9928       else if (player->shield_normal_time_left)
9929         PlayLevelSound(player->jx, player->jy, SND_SHIELD_NORMAL_ACTIVE);
9930     }
9931   }
9932
9933   CheckLevelTime();
9934
9935   DrawAllPlayers();
9936   PlayAllPlayersSound();
9937
9938   if (options.debug)                    /* calculate frames per second */
9939   {
9940     static unsigned long fps_counter = 0;
9941     static int fps_frames = 0;
9942     unsigned long fps_delay_ms = Counter() - fps_counter;
9943
9944     fps_frames++;
9945
9946     if (fps_delay_ms >= 500)    /* calculate fps every 0.5 seconds */
9947     {
9948       global.frames_per_second = 1000 * (float)fps_frames / fps_delay_ms;
9949
9950       fps_frames = 0;
9951       fps_counter = Counter();
9952     }
9953
9954     redraw_mask |= REDRAW_FPS;
9955   }
9956
9957   AdvanceFrameAndPlayerCounters(-1);    /* advance counters for all players */
9958
9959   if (local_player->show_envelope != 0 && local_player->MovPos == 0)
9960   {
9961     ShowEnvelope(local_player->show_envelope - EL_ENVELOPE_1);
9962
9963     local_player->show_envelope = 0;
9964   }
9965
9966   /* use random number generator in every frame to make it less predictable */
9967   if (game.engine_version >= VERSION_IDENT(3,1,1,0))
9968     RND(1);
9969 }
9970
9971 static boolean AllPlayersInSight(struct PlayerInfo *player, int x, int y)
9972 {
9973   int min_x = x, min_y = y, max_x = x, max_y = y;
9974   int i;
9975
9976   for (i = 0; i < MAX_PLAYERS; i++)
9977   {
9978     int jx = stored_player[i].jx, jy = stored_player[i].jy;
9979
9980     if (!stored_player[i].active || &stored_player[i] == player)
9981       continue;
9982
9983     min_x = MIN(min_x, jx);
9984     min_y = MIN(min_y, jy);
9985     max_x = MAX(max_x, jx);
9986     max_y = MAX(max_y, jy);
9987   }
9988
9989   return (max_x - min_x < SCR_FIELDX && max_y - min_y < SCR_FIELDY);
9990 }
9991
9992 static boolean AllPlayersInVisibleScreen()
9993 {
9994   int i;
9995
9996   for (i = 0; i < MAX_PLAYERS; i++)
9997   {
9998     int jx = stored_player[i].jx, jy = stored_player[i].jy;
9999
10000     if (!stored_player[i].active)
10001       continue;
10002
10003     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
10004       return FALSE;
10005   }
10006
10007   return TRUE;
10008 }
10009
10010 void ScrollLevel(int dx, int dy)
10011 {
10012   int softscroll_offset = (setup.soft_scrolling ? TILEX : 0);
10013   int x, y;
10014
10015   BlitBitmap(drawto_field, drawto_field,
10016              FX + TILEX * (dx == -1) - softscroll_offset,
10017              FY + TILEY * (dy == -1) - softscroll_offset,
10018              SXSIZE - TILEX * (dx!=0) + 2 * softscroll_offset,
10019              SYSIZE - TILEY * (dy!=0) + 2 * softscroll_offset,
10020              FX + TILEX * (dx == 1) - softscroll_offset,
10021              FY + TILEY * (dy == 1) - softscroll_offset);
10022
10023   if (dx)
10024   {
10025     x = (dx == 1 ? BX1 : BX2);
10026     for (y = BY1; y <= BY2; y++)
10027       DrawScreenField(x, y);
10028   }
10029
10030   if (dy)
10031   {
10032     y = (dy == 1 ? BY1 : BY2);
10033     for (x = BX1; x <= BX2; x++)
10034       DrawScreenField(x, y);
10035   }
10036
10037   redraw_mask |= REDRAW_FIELD;
10038 }
10039
10040 static boolean canFallDown(struct PlayerInfo *player)
10041 {
10042   int jx = player->jx, jy = player->jy;
10043
10044   return (IN_LEV_FIELD(jx, jy + 1) &&
10045           (IS_FREE(jx, jy + 1) ||
10046            (Feld[jx][jy + 1] == EL_ACID && player->can_fall_into_acid)) &&
10047           IS_WALKABLE_FROM(Feld[jx][jy], MV_DOWN) &&
10048           !IS_WALKABLE_INSIDE(Feld[jx][jy]));
10049 }
10050
10051 static boolean canPassField(int x, int y, int move_dir)
10052 {
10053   int opposite_dir = MV_DIR_OPPOSITE(move_dir);
10054   int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
10055   int dy = (move_dir & MV_UP   ? -1 : move_dir & MV_DOWN  ? +1 : 0);
10056   int nextx = x + dx;
10057   int nexty = y + dy;
10058   int element = Feld[x][y];
10059
10060   return (IS_PASSABLE_FROM(element, opposite_dir) &&
10061           !CAN_MOVE(element) &&
10062           IN_LEV_FIELD(nextx, nexty) && !IS_PLAYER(nextx, nexty) &&
10063           IS_WALKABLE_FROM(Feld[nextx][nexty], move_dir) &&
10064           (level.can_pass_to_walkable || IS_FREE(nextx, nexty)));
10065 }
10066
10067 static boolean canMoveToValidFieldWithGravity(int x, int y, int move_dir)
10068 {
10069   int opposite_dir = MV_DIR_OPPOSITE(move_dir);
10070   int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
10071   int dy = (move_dir & MV_UP   ? -1 : move_dir & MV_DOWN  ? +1 : 0);
10072   int newx = x + dx;
10073   int newy = y + dy;
10074
10075   return (IN_LEV_FIELD(newx, newy) && !IS_FREE_OR_PLAYER(newx, newy) &&
10076           IS_GRAVITY_REACHABLE(Feld[newx][newy]) &&
10077           (IS_DIGGABLE(Feld[newx][newy]) ||
10078            IS_WALKABLE_FROM(Feld[newx][newy], opposite_dir) ||
10079            canPassField(newx, newy, move_dir)));
10080 }
10081
10082 static void CheckGravityMovement(struct PlayerInfo *player)
10083 {
10084   if (game.gravity && !player->programmed_action)
10085   {
10086     int move_dir_horizontal = player->effective_action & MV_HORIZONTAL;
10087     int move_dir_vertical   = player->effective_action & MV_VERTICAL;
10088     boolean player_is_snapping = player->effective_action & JOY_BUTTON_1;
10089     int jx = player->jx, jy = player->jy;
10090     boolean player_is_moving_to_valid_field =
10091       (!player_is_snapping &&
10092        (canMoveToValidFieldWithGravity(jx, jy, move_dir_horizontal) ||
10093         canMoveToValidFieldWithGravity(jx, jy, move_dir_vertical)));
10094     boolean player_can_fall_down = canFallDown(player);
10095
10096     if (player_can_fall_down &&
10097         !player_is_moving_to_valid_field)
10098       player->programmed_action = MV_DOWN;
10099   }
10100 }
10101
10102 static void CheckGravityMovementWhenNotMoving(struct PlayerInfo *player)
10103 {
10104   return CheckGravityMovement(player);
10105
10106   if (game.gravity && !player->programmed_action)
10107   {
10108     int jx = player->jx, jy = player->jy;
10109     boolean field_under_player_is_free =
10110       (IN_LEV_FIELD(jx, jy + 1) && IS_FREE(jx, jy + 1));
10111     boolean player_is_standing_on_valid_field =
10112       (IS_WALKABLE_INSIDE(Feld[jx][jy]) ||
10113        (IS_WALKABLE(Feld[jx][jy]) &&
10114         !(element_info[Feld[jx][jy]].access_direction & MV_DOWN)));
10115
10116     if (field_under_player_is_free && !player_is_standing_on_valid_field)
10117       player->programmed_action = MV_DOWN;
10118   }
10119 }
10120
10121 /*
10122   MovePlayerOneStep()
10123   -----------------------------------------------------------------------------
10124   dx, dy:               direction (non-diagonal) to try to move the player to
10125   real_dx, real_dy:     direction as read from input device (can be diagonal)
10126 */
10127
10128 boolean MovePlayerOneStep(struct PlayerInfo *player,
10129                           int dx, int dy, int real_dx, int real_dy)
10130 {
10131   int jx = player->jx, jy = player->jy;
10132   int new_jx = jx + dx, new_jy = jy + dy;
10133 #if !USE_FIXED_DONT_RUN_INTO
10134   int element;
10135 #endif
10136   int can_move;
10137   boolean player_can_move = !player->cannot_move;
10138
10139   if (!player->active || (!dx && !dy))
10140     return MP_NO_ACTION;
10141
10142   player->MovDir = (dx < 0 ? MV_LEFT :
10143                     dx > 0 ? MV_RIGHT :
10144                     dy < 0 ? MV_UP :
10145                     dy > 0 ? MV_DOWN :  MV_NONE);
10146
10147   if (!IN_LEV_FIELD(new_jx, new_jy))
10148     return MP_NO_ACTION;
10149
10150   if (!player_can_move)
10151   {
10152 #if 1
10153     if (player->MovPos == 0)
10154     {
10155       player->is_moving = FALSE;
10156       player->is_digging = FALSE;
10157       player->is_collecting = FALSE;
10158       player->is_snapping = FALSE;
10159       player->is_pushing = FALSE;
10160     }
10161 #else
10162     DigField(player, 0, 0, 0, 0, 0, 0, DF_NO_PUSH);
10163     SnapField(player, 0, 0);
10164 #endif
10165
10166 #if 0
10167     return MP_NO_ACTION;
10168 #endif
10169   }
10170
10171 #if 1
10172   if (!options.network && game.centered_player_nr == -1 &&
10173       !AllPlayersInSight(player, new_jx, new_jy))
10174     return MP_NO_ACTION;
10175 #else
10176   if (!options.network && !AllPlayersInSight(player, new_jx, new_jy))
10177     return MP_NO_ACTION;
10178 #endif
10179
10180 #if !USE_FIXED_DONT_RUN_INTO
10181   element = MovingOrBlocked2ElementIfNotLeaving(new_jx, new_jy);
10182
10183   /* (moved to DigField()) */
10184   if (player_can_move && DONT_RUN_INTO(element))
10185   {
10186     if (element == EL_ACID && dx == 0 && dy == 1)
10187     {
10188       SplashAcid(new_jx, new_jy);
10189       Feld[jx][jy] = EL_PLAYER_1;
10190       InitMovingField(jx, jy, MV_DOWN);
10191       Store[jx][jy] = EL_ACID;
10192       ContinueMoving(jx, jy);
10193       BuryPlayer(player);
10194     }
10195     else
10196       TestIfPlayerRunsIntoBadThing(jx, jy, player->MovDir);
10197
10198     return MP_MOVING;
10199   }
10200 #endif
10201
10202   can_move = DigField(player, jx, jy, new_jx, new_jy, real_dx,real_dy, DF_DIG);
10203 #if 0
10204 #if USE_FIXED_DONT_RUN_INTO
10205   if (can_move == MP_DONT_RUN_INTO)
10206     return MP_MOVING;
10207 #endif
10208 #endif
10209   if (can_move != MP_MOVING)
10210     return can_move;
10211
10212 #if USE_FIXED_DONT_RUN_INTO
10213 #endif
10214
10215   /* check if DigField() has caused relocation of the player */
10216   if (player->jx != jx || player->jy != jy)
10217     return MP_NO_ACTION;        /* <-- !!! CHECK THIS [-> MP_ACTION ?] !!! */
10218
10219   StorePlayer[jx][jy] = 0;
10220   player->last_jx = jx;
10221   player->last_jy = jy;
10222   player->jx = new_jx;
10223   player->jy = new_jy;
10224   StorePlayer[new_jx][new_jy] = player->element_nr;
10225
10226   if (player->move_delay_value_next != -1)
10227   {
10228     player->move_delay_value = player->move_delay_value_next;
10229     player->move_delay_value_next = -1;
10230   }
10231
10232   player->MovPos =
10233     (dx > 0 || dy > 0 ? -1 : 1) * (TILEX - TILEX / player->move_delay_value);
10234
10235   player->step_counter++;
10236
10237   PlayerVisit[jx][jy] = FrameCounter;
10238
10239   ScrollPlayer(player, SCROLL_INIT);
10240
10241   return MP_MOVING;
10242 }
10243
10244 boolean MovePlayer(struct PlayerInfo *player, int dx, int dy)
10245 {
10246   int jx = player->jx, jy = player->jy;
10247   int old_jx = jx, old_jy = jy;
10248   int moved = MP_NO_ACTION;
10249
10250   if (!player->active)
10251     return FALSE;
10252
10253   if (!dx && !dy)
10254   {
10255     if (player->MovPos == 0)
10256     {
10257       player->is_moving = FALSE;
10258       player->is_digging = FALSE;
10259       player->is_collecting = FALSE;
10260       player->is_snapping = FALSE;
10261       player->is_pushing = FALSE;
10262     }
10263
10264     return FALSE;
10265   }
10266
10267   if (player->move_delay > 0)
10268     return FALSE;
10269
10270   player->move_delay = -1;              /* set to "uninitialized" value */
10271
10272   /* store if player is automatically moved to next field */
10273   player->is_auto_moving = (player->programmed_action != MV_NONE);
10274
10275   /* remove the last programmed player action */
10276   player->programmed_action = 0;
10277
10278   if (player->MovPos)
10279   {
10280     /* should only happen if pre-1.2 tape recordings are played */
10281     /* this is only for backward compatibility */
10282
10283     int original_move_delay_value = player->move_delay_value;
10284
10285 #if DEBUG
10286     printf("THIS SHOULD ONLY HAPPEN WITH PRE-1.2 LEVEL TAPES. [%ld]\n",
10287            tape.counter);
10288 #endif
10289
10290     /* scroll remaining steps with finest movement resolution */
10291     player->move_delay_value = MOVE_DELAY_NORMAL_SPEED;
10292
10293     while (player->MovPos)
10294     {
10295       ScrollPlayer(player, SCROLL_GO_ON);
10296       ScrollScreen(NULL, SCROLL_GO_ON);
10297
10298       AdvanceFrameAndPlayerCounters(player->index_nr);
10299
10300       DrawAllPlayers();
10301       BackToFront();
10302     }
10303
10304     player->move_delay_value = original_move_delay_value;
10305   }
10306
10307   if (player->last_move_dir & MV_HORIZONTAL)
10308   {
10309     if (!(moved |= MovePlayerOneStep(player, 0, dy, dx, dy)))
10310       moved |= MovePlayerOneStep(player, dx, 0, dx, dy);
10311   }
10312   else
10313   {
10314     if (!(moved |= MovePlayerOneStep(player, dx, 0, dx, dy)))
10315       moved |= MovePlayerOneStep(player, 0, dy, dx, dy);
10316   }
10317
10318   jx = player->jx;
10319   jy = player->jy;
10320
10321 #if 1
10322   if (moved & MP_MOVING && !ScreenMovPos &&
10323       (player->index_nr == game.centered_player_nr ||
10324        game.centered_player_nr == -1))
10325 #else
10326   if (moved & MP_MOVING && !ScreenMovPos &&
10327       (player == local_player || !options.network))
10328 #endif
10329   {
10330     int old_scroll_x = scroll_x, old_scroll_y = scroll_y;
10331     int offset = (setup.scroll_delay ? 3 : 0);
10332
10333     if (!IN_VIS_FIELD(SCREENX(jx), SCREENY(jy)))
10334     {
10335       /* actual player has left the screen -- scroll in that direction */
10336       if (jx != old_jx)         /* player has moved horizontally */
10337         scroll_x += (jx - old_jx);
10338       else                      /* player has moved vertically */
10339         scroll_y += (jy - old_jy);
10340     }
10341     else
10342     {
10343       if (jx != old_jx)         /* player has moved horizontally */
10344       {
10345         if ((player->MovDir == MV_LEFT  && scroll_x > jx - MIDPOSX + offset) ||
10346             (player->MovDir == MV_RIGHT && scroll_x < jx - MIDPOSX - offset))
10347           scroll_x = jx-MIDPOSX + (scroll_x < jx-MIDPOSX ? -offset : +offset);
10348
10349         /* don't scroll over playfield boundaries */
10350         if (scroll_x < SBX_Left || scroll_x > SBX_Right)
10351           scroll_x = (scroll_x < SBX_Left ? SBX_Left : SBX_Right);
10352
10353         /* don't scroll more than one field at a time */
10354         scroll_x = old_scroll_x + SIGN(scroll_x - old_scroll_x);
10355
10356         /* don't scroll against the player's moving direction */
10357         if ((player->MovDir == MV_LEFT  && scroll_x > old_scroll_x) ||
10358             (player->MovDir == MV_RIGHT && scroll_x < old_scroll_x))
10359           scroll_x = old_scroll_x;
10360       }
10361       else                      /* player has moved vertically */
10362       {
10363         if ((player->MovDir == MV_UP   && scroll_y > jy - MIDPOSY + offset) ||
10364             (player->MovDir == MV_DOWN && scroll_y < jy - MIDPOSY - offset))
10365           scroll_y = jy-MIDPOSY + (scroll_y < jy-MIDPOSY ? -offset : +offset);
10366
10367         /* don't scroll over playfield boundaries */
10368         if (scroll_y < SBY_Upper || scroll_y > SBY_Lower)
10369           scroll_y = (scroll_y < SBY_Upper ? SBY_Upper : SBY_Lower);
10370
10371         /* don't scroll more than one field at a time */
10372         scroll_y = old_scroll_y + SIGN(scroll_y - old_scroll_y);
10373
10374         /* don't scroll against the player's moving direction */
10375         if ((player->MovDir == MV_UP   && scroll_y > old_scroll_y) ||
10376             (player->MovDir == MV_DOWN && scroll_y < old_scroll_y))
10377           scroll_y = old_scroll_y;
10378       }
10379     }
10380
10381     if (scroll_x != old_scroll_x || scroll_y != old_scroll_y)
10382     {
10383 #if 1
10384       if (!options.network && game.centered_player_nr == -1 &&
10385           !AllPlayersInVisibleScreen())
10386       {
10387         scroll_x = old_scroll_x;
10388         scroll_y = old_scroll_y;
10389       }
10390       else
10391 #else
10392       if (!options.network && !AllPlayersInVisibleScreen())
10393       {
10394         scroll_x = old_scroll_x;
10395         scroll_y = old_scroll_y;
10396       }
10397       else
10398 #endif
10399       {
10400         ScrollScreen(player, SCROLL_INIT);
10401         ScrollLevel(old_scroll_x - scroll_x, old_scroll_y - scroll_y);
10402       }
10403     }
10404   }
10405
10406   player->StepFrame = 0;
10407
10408   if (moved & MP_MOVING)
10409   {
10410     if (old_jx != jx && old_jy == jy)
10411       player->MovDir = (old_jx < jx ? MV_RIGHT : MV_LEFT);
10412     else if (old_jx == jx && old_jy != jy)
10413       player->MovDir = (old_jy < jy ? MV_DOWN : MV_UP);
10414
10415     DrawLevelField(jx, jy);     /* for "crumbled sand" */
10416
10417     player->last_move_dir = player->MovDir;
10418     player->is_moving = TRUE;
10419     player->is_snapping = FALSE;
10420     player->is_switching = FALSE;
10421     player->is_dropping = FALSE;
10422     player->is_dropping_pressed = FALSE;
10423     player->drop_pressed_delay = 0;
10424   }
10425   else
10426   {
10427     CheckGravityMovementWhenNotMoving(player);
10428
10429     player->is_moving = FALSE;
10430
10431     /* at this point, the player is allowed to move, but cannot move right now
10432        (e.g. because of something blocking the way) -- ensure that the player
10433        is also allowed to move in the next frame (in old versions before 3.1.1,
10434        the player was forced to wait again for eight frames before next try) */
10435
10436     if (game.engine_version >= VERSION_IDENT(3,1,1,0))
10437       player->move_delay = 0;   /* allow direct movement in the next frame */
10438   }
10439
10440   if (player->move_delay == -1)         /* not yet initialized by DigField() */
10441     player->move_delay = player->move_delay_value;
10442
10443   if (game.engine_version < VERSION_IDENT(3,0,7,0))
10444   {
10445     TestIfPlayerTouchesBadThing(jx, jy);
10446     TestIfPlayerTouchesCustomElement(jx, jy);
10447   }
10448
10449   if (!player->active)
10450     RemovePlayer(player);
10451
10452   return moved;
10453 }
10454
10455 void ScrollPlayer(struct PlayerInfo *player, int mode)
10456 {
10457   int jx = player->jx, jy = player->jy;
10458   int last_jx = player->last_jx, last_jy = player->last_jy;
10459   int move_stepsize = TILEX / player->move_delay_value;
10460
10461 #if USE_NEW_PLAYER_SPEED
10462   if (!player->active)
10463     return;
10464
10465   if (player->MovPos == 0 && mode == SCROLL_GO_ON)      /* player not moving */
10466     return;
10467 #else
10468   if (!player->active || player->MovPos == 0)
10469     return;
10470 #endif
10471
10472   if (mode == SCROLL_INIT)
10473   {
10474     player->actual_frame_counter = FrameCounter;
10475     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
10476
10477     if ((player->block_last_field || player->block_delay_adjustment > 0) &&
10478         Feld[last_jx][last_jy] == EL_EMPTY)
10479     {
10480       int last_field_block_delay = 0;   /* start with no blocking at all */
10481       int block_delay_adjustment = player->block_delay_adjustment;
10482
10483       /* if player blocks last field, add delay for exactly one move */
10484       if (player->block_last_field)
10485       {
10486         last_field_block_delay += player->move_delay_value;
10487
10488         /* when blocking enabled, prevent moving up despite gravity */
10489         if (game.gravity && player->MovDir == MV_UP)
10490           block_delay_adjustment = -1;
10491       }
10492
10493       /* add block delay adjustment (also possible when not blocking) */
10494       last_field_block_delay += block_delay_adjustment;
10495
10496       Feld[last_jx][last_jy] = EL_PLAYER_IS_LEAVING;
10497       MovDelay[last_jx][last_jy] = last_field_block_delay + 1;
10498     }
10499
10500 #if USE_NEW_PLAYER_SPEED
10501     if (player->MovPos != 0)    /* player has not yet reached destination */
10502       return;
10503 #else
10504     return;
10505 #endif
10506   }
10507   else if (!FrameReached(&player->actual_frame_counter, 1))
10508     return;
10509
10510 #if 0
10511   printf("::: player->MovPos: %d -> %d\n",
10512          player->MovPos,
10513          player->MovPos + (player->MovPos > 0 ? -1 : 1) * move_stepsize);
10514 #endif
10515
10516 #if USE_NEW_PLAYER_SPEED
10517   if (player->MovPos != 0)
10518   {
10519     player->MovPos += (player->MovPos > 0 ? -1 : 1) * move_stepsize;
10520     player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
10521
10522     /* before DrawPlayer() to draw correct player graphic for this case */
10523     if (player->MovPos == 0)
10524       CheckGravityMovement(player);
10525   }
10526 #else
10527   player->MovPos += (player->MovPos > 0 ? -1 : 1) * move_stepsize;
10528   player->GfxPos = move_stepsize * (player->MovPos / move_stepsize);
10529
10530   /* before DrawPlayer() to draw correct player graphic for this case */
10531   if (player->MovPos == 0)
10532     CheckGravityMovement(player);
10533 #endif
10534
10535   if (player->MovPos == 0)      /* player reached destination field */
10536   {
10537 #if 0
10538     printf("::: player reached destination field\n");
10539 #endif
10540
10541     if (player->move_delay_reset_counter > 0)
10542     {
10543       player->move_delay_reset_counter--;
10544
10545       if (player->move_delay_reset_counter == 0)
10546       {
10547         /* continue with normal speed after quickly moving through gate */
10548         HALVE_PLAYER_SPEED(player);
10549
10550         /* be able to make the next move without delay */
10551         player->move_delay = 0;
10552       }
10553     }
10554
10555     player->last_jx = jx;
10556     player->last_jy = jy;
10557
10558     if (Feld[jx][jy] == EL_EXIT_OPEN ||
10559         Feld[jx][jy] == EL_SP_EXIT_OPEN ||
10560         Feld[jx][jy] == EL_SP_EXIT_OPENING)     /* <-- special case */
10561     {
10562       DrawPlayer(player);       /* needed here only to cleanup last field */
10563       RemovePlayer(player);
10564
10565       if (local_player->friends_still_needed == 0 ||
10566           IS_SP_ELEMENT(Feld[jx][jy]))
10567         player->LevelSolved = player->GameOver = TRUE;
10568     }
10569
10570     /* this breaks one level: "machine", level 000 */
10571     {
10572       int move_direction = player->MovDir;
10573       int enter_side = MV_DIR_OPPOSITE(move_direction);
10574       int leave_side = move_direction;
10575       int old_jx = last_jx;
10576       int old_jy = last_jy;
10577       int old_element = Feld[old_jx][old_jy];
10578       int new_element = Feld[jx][jy];
10579
10580       if (IS_CUSTOM_ELEMENT(old_element))
10581         CheckElementChangeByPlayer(old_jx, old_jy, old_element,
10582                                    CE_LEFT_BY_PLAYER,
10583                                    player->index_bit, leave_side);
10584
10585       CheckTriggeredElementChangeByPlayer(old_jx, old_jy, old_element,
10586                                           CE_PLAYER_LEAVES_X,
10587                                           player->index_bit, leave_side);
10588
10589       if (IS_CUSTOM_ELEMENT(new_element))
10590         CheckElementChangeByPlayer(jx, jy, new_element, CE_ENTERED_BY_PLAYER,
10591                                    player->index_bit, enter_side);
10592
10593       CheckTriggeredElementChangeByPlayer(jx, jy, new_element,
10594                                           CE_PLAYER_ENTERS_X,
10595                                           player->index_bit, enter_side);
10596
10597       CheckTriggeredElementChangeBySide(jx, jy, player->element_nr,
10598                                         CE_MOVE_OF_X, move_direction);
10599     }
10600
10601     if (game.engine_version >= VERSION_IDENT(3,0,7,0))
10602     {
10603       TestIfPlayerTouchesBadThing(jx, jy);
10604       TestIfPlayerTouchesCustomElement(jx, jy);
10605
10606       /* needed because pushed element has not yet reached its destination,
10607          so it would trigger a change event at its previous field location */
10608       if (!player->is_pushing)
10609         TestIfElementTouchesCustomElement(jx, jy);      /* for empty space */
10610
10611       if (!player->active)
10612         RemovePlayer(player);
10613     }
10614
10615     if (level.use_step_counter)
10616     {
10617       int i;
10618
10619       TimePlayed++;
10620
10621       if (TimeLeft > 0)
10622       {
10623         TimeLeft--;
10624
10625         if (TimeLeft <= 10 && setup.time_limit)
10626           PlaySoundStereo(SND_GAME_RUNNING_OUT_OF_TIME, SOUND_MIDDLE);
10627
10628         DrawGameValue_Time(TimeLeft);
10629
10630         if (!TimeLeft && setup.time_limit)
10631           for (i = 0; i < MAX_PLAYERS; i++)
10632             KillPlayer(&stored_player[i]);
10633       }
10634       else if (level.time == 0 && !AllPlayersGone) /* level w/o time limit */
10635         DrawGameValue_Time(TimePlayed);
10636     }
10637
10638     if (tape.single_step && tape.recording && !tape.pausing &&
10639         !player->programmed_action)
10640       TapeTogglePause(TAPE_TOGGLE_AUTOMATIC);
10641   }
10642 }
10643
10644 void ScrollScreen(struct PlayerInfo *player, int mode)
10645 {
10646   static unsigned long screen_frame_counter = 0;
10647
10648   if (mode == SCROLL_INIT)
10649   {
10650     /* set scrolling step size according to actual player's moving speed */
10651     ScrollStepSize = TILEX / player->move_delay_value;
10652
10653     screen_frame_counter = FrameCounter;
10654     ScreenMovDir = player->MovDir;
10655     ScreenMovPos = player->MovPos;
10656     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
10657     return;
10658   }
10659   else if (!FrameReached(&screen_frame_counter, 1))
10660     return;
10661
10662   if (ScreenMovPos)
10663   {
10664     ScreenMovPos += (ScreenMovPos > 0 ? -1 : 1) * ScrollStepSize;
10665     ScreenGfxPos = ScrollStepSize * (ScreenMovPos / ScrollStepSize);
10666     redraw_mask |= REDRAW_FIELD;
10667   }
10668   else
10669     ScreenMovDir = MV_NONE;
10670 }
10671
10672 void TestIfPlayerTouchesCustomElement(int x, int y)
10673 {
10674   static int xy[4][2] =
10675   {
10676     { 0, -1 },
10677     { -1, 0 },
10678     { +1, 0 },
10679     { 0, +1 }
10680   };
10681   static int trigger_sides[4][2] =
10682   {
10683     /* center side       border side */
10684     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      /* check top    */
10685     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      /* check left   */
10686     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      /* check right  */
10687     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       /* check bottom */
10688   };
10689   static int touch_dir[4] =
10690   {
10691     MV_LEFT | MV_RIGHT,
10692     MV_UP   | MV_DOWN,
10693     MV_UP   | MV_DOWN,
10694     MV_LEFT | MV_RIGHT
10695   };
10696   int center_element = Feld[x][y];      /* should always be non-moving! */
10697   int i;
10698
10699   for (i = 0; i < NUM_DIRECTIONS; i++)
10700   {
10701     int xx = x + xy[i][0];
10702     int yy = y + xy[i][1];
10703     int center_side = trigger_sides[i][0];
10704     int border_side = trigger_sides[i][1];
10705     int border_element;
10706
10707     if (!IN_LEV_FIELD(xx, yy))
10708       continue;
10709
10710     if (IS_PLAYER(x, y))
10711     {
10712       struct PlayerInfo *player = PLAYERINFO(x, y);
10713
10714       if (game.engine_version < VERSION_IDENT(3,0,7,0))
10715         border_element = Feld[xx][yy];          /* may be moving! */
10716       else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
10717         border_element = Feld[xx][yy];
10718       else if (MovDir[xx][yy] & touch_dir[i])   /* elements are touching */
10719         border_element = MovingOrBlocked2Element(xx, yy);
10720       else
10721         continue;               /* center and border element do not touch */
10722
10723       CheckElementChangeByPlayer(xx, yy, border_element, CE_TOUCHED_BY_PLAYER,
10724                                  player->index_bit, border_side);
10725       CheckTriggeredElementChangeByPlayer(xx, yy, border_element,
10726                                           CE_PLAYER_TOUCHES_X,
10727                                           player->index_bit, border_side);
10728     }
10729     else if (IS_PLAYER(xx, yy))
10730     {
10731       struct PlayerInfo *player = PLAYERINFO(xx, yy);
10732
10733       if (game.engine_version >= VERSION_IDENT(3,0,7,0))
10734       {
10735         if (player->MovPos != 0 && !(player->MovDir & touch_dir[i]))
10736           continue;             /* center and border element do not touch */
10737       }
10738
10739       CheckElementChangeByPlayer(x, y, center_element, CE_TOUCHED_BY_PLAYER,
10740                                  player->index_bit, center_side);
10741       CheckTriggeredElementChangeByPlayer(x, y, center_element,
10742                                           CE_PLAYER_TOUCHES_X,
10743                                           player->index_bit, center_side);
10744       break;
10745     }
10746   }
10747 }
10748
10749 #if USE_ELEMENT_TOUCHING_BUGFIX
10750
10751 void TestIfElementTouchesCustomElement(int x, int y)
10752 {
10753   static int xy[4][2] =
10754   {
10755     { 0, -1 },
10756     { -1, 0 },
10757     { +1, 0 },
10758     { 0, +1 }
10759   };
10760   static int trigger_sides[4][2] =
10761   {
10762     /* center side      border side */
10763     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      /* check top    */
10764     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      /* check left   */
10765     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      /* check right  */
10766     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       /* check bottom */
10767   };
10768   static int touch_dir[4] =
10769   {
10770     MV_LEFT | MV_RIGHT,
10771     MV_UP   | MV_DOWN,
10772     MV_UP   | MV_DOWN,
10773     MV_LEFT | MV_RIGHT
10774   };
10775   boolean change_center_element = FALSE;
10776   int center_element = Feld[x][y];      /* should always be non-moving! */
10777   int border_element_old[NUM_DIRECTIONS];
10778   int i;
10779
10780   for (i = 0; i < NUM_DIRECTIONS; i++)
10781   {
10782     int xx = x + xy[i][0];
10783     int yy = y + xy[i][1];
10784     int border_element;
10785
10786     border_element_old[i] = -1;
10787
10788     if (!IN_LEV_FIELD(xx, yy))
10789       continue;
10790
10791     if (game.engine_version < VERSION_IDENT(3,0,7,0))
10792       border_element = Feld[xx][yy];    /* may be moving! */
10793     else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
10794       border_element = Feld[xx][yy];
10795     else if (MovDir[xx][yy] & touch_dir[i])     /* elements are touching */
10796       border_element = MovingOrBlocked2Element(xx, yy);
10797     else
10798       continue;                 /* center and border element do not touch */
10799
10800     border_element_old[i] = border_element;
10801   }
10802
10803   for (i = 0; i < NUM_DIRECTIONS; i++)
10804   {
10805     int xx = x + xy[i][0];
10806     int yy = y + xy[i][1];
10807     int center_side = trigger_sides[i][0];
10808     int border_element = border_element_old[i];
10809
10810     if (border_element == -1)
10811       continue;
10812
10813     /* check for change of border element */
10814     CheckElementChangeBySide(xx, yy, border_element, center_element,
10815                              CE_TOUCHING_X, center_side);
10816   }
10817
10818   for (i = 0; i < NUM_DIRECTIONS; i++)
10819   {
10820     int border_side = trigger_sides[i][1];
10821     int border_element = border_element_old[i];
10822
10823     if (border_element == -1)
10824       continue;
10825
10826     /* check for change of center element (but change it only once) */
10827     if (!change_center_element)
10828       change_center_element =
10829         CheckElementChangeBySide(x, y, center_element, border_element,
10830                                  CE_TOUCHING_X, border_side);
10831   }
10832 }
10833
10834 #else
10835
10836 void TestIfElementTouchesCustomElement_OLD(int x, int y)
10837 {
10838   static int xy[4][2] =
10839   {
10840     { 0, -1 },
10841     { -1, 0 },
10842     { +1, 0 },
10843     { 0, +1 }
10844   };
10845   static int trigger_sides[4][2] =
10846   {
10847     /* center side      border side */
10848     { CH_SIDE_TOP,      CH_SIDE_BOTTOM  },      /* check top    */
10849     { CH_SIDE_LEFT,     CH_SIDE_RIGHT   },      /* check left   */
10850     { CH_SIDE_RIGHT,    CH_SIDE_LEFT    },      /* check right  */
10851     { CH_SIDE_BOTTOM,   CH_SIDE_TOP     }       /* check bottom */
10852   };
10853   static int touch_dir[4] =
10854   {
10855     MV_LEFT | MV_RIGHT,
10856     MV_UP   | MV_DOWN,
10857     MV_UP   | MV_DOWN,
10858     MV_LEFT | MV_RIGHT
10859   };
10860   boolean change_center_element = FALSE;
10861   int center_element = Feld[x][y];      /* should always be non-moving! */
10862   int i;
10863
10864   for (i = 0; i < NUM_DIRECTIONS; i++)
10865   {
10866     int xx = x + xy[i][0];
10867     int yy = y + xy[i][1];
10868     int center_side = trigger_sides[i][0];
10869     int border_side = trigger_sides[i][1];
10870     int border_element;
10871
10872     if (!IN_LEV_FIELD(xx, yy))
10873       continue;
10874
10875     if (game.engine_version < VERSION_IDENT(3,0,7,0))
10876       border_element = Feld[xx][yy];    /* may be moving! */
10877     else if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
10878       border_element = Feld[xx][yy];
10879     else if (MovDir[xx][yy] & touch_dir[i])     /* elements are touching */
10880       border_element = MovingOrBlocked2Element(xx, yy);
10881     else
10882       continue;                 /* center and border element do not touch */
10883
10884     /* check for change of center element (but change it only once) */
10885     if (!change_center_element)
10886       change_center_element =
10887         CheckElementChangeBySide(x, y, center_element, border_element,
10888                                  CE_TOUCHING_X, border_side);
10889
10890     /* check for change of border element */
10891     CheckElementChangeBySide(xx, yy, border_element, center_element,
10892                              CE_TOUCHING_X, center_side);
10893   }
10894 }
10895
10896 #endif
10897
10898 void TestIfElementHitsCustomElement(int x, int y, int direction)
10899 {
10900   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
10901   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
10902   int hitx = x + dx, hity = y + dy;
10903   int hitting_element = Feld[x][y];
10904   int touched_element;
10905
10906   if (IN_LEV_FIELD(hitx, hity) && IS_FREE(hitx, hity))
10907     return;
10908
10909   touched_element = (IN_LEV_FIELD(hitx, hity) ?
10910                      MovingOrBlocked2Element(hitx, hity) : EL_STEELWALL);
10911
10912   if (IN_LEV_FIELD(hitx, hity))
10913   {
10914     int opposite_direction = MV_DIR_OPPOSITE(direction);
10915     int hitting_side = direction;
10916     int touched_side = opposite_direction;
10917     boolean object_hit = (!IS_MOVING(hitx, hity) ||
10918                           MovDir[hitx][hity] != direction ||
10919                           ABS(MovPos[hitx][hity]) <= TILEY / 2);
10920
10921     object_hit = TRUE;
10922
10923     if (object_hit)
10924     {
10925       CheckElementChangeBySide(x, y, hitting_element, touched_element,
10926                                CE_HITTING_X, touched_side);
10927
10928       CheckElementChangeBySide(hitx, hity, touched_element,
10929                                hitting_element, CE_HIT_BY_X, hitting_side);
10930
10931       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
10932                                CE_HIT_BY_SOMETHING, opposite_direction);
10933     }
10934   }
10935
10936   /* "hitting something" is also true when hitting the playfield border */
10937   CheckElementChangeBySide(x, y, hitting_element, touched_element,
10938                            CE_HITTING_SOMETHING, direction);
10939 }
10940
10941 #if 0
10942 void TestIfElementSmashesCustomElement(int x, int y, int direction)
10943 {
10944   int dx = (direction == MV_LEFT ? -1 : direction == MV_RIGHT ? +1 : 0);
10945   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
10946   int hitx = x + dx, hity = y + dy;
10947   int hitting_element = Feld[x][y];
10948   int touched_element;
10949 #if 0
10950   boolean object_hit = (IN_LEV_FIELD(hitx, hity) &&
10951                         !IS_FREE(hitx, hity) &&
10952                         (!IS_MOVING(hitx, hity) ||
10953                          MovDir[hitx][hity] != direction ||
10954                          ABS(MovPos[hitx][hity]) <= TILEY / 2));
10955 #endif
10956
10957   if (IN_LEV_FIELD(hitx, hity) && IS_FREE(hitx, hity))
10958     return;
10959
10960 #if 0
10961   if (IN_LEV_FIELD(hitx, hity) && !object_hit)
10962     return;
10963 #endif
10964
10965   touched_element = (IN_LEV_FIELD(hitx, hity) ?
10966                      MovingOrBlocked2Element(hitx, hity) : EL_STEELWALL);
10967
10968   CheckElementChangeBySide(x, y, hitting_element, touched_element,
10969                            EP_CAN_SMASH_EVERYTHING, direction);
10970
10971   if (IN_LEV_FIELD(hitx, hity))
10972   {
10973     int opposite_direction = MV_DIR_OPPOSITE(direction);
10974     int hitting_side = direction;
10975     int touched_side = opposite_direction;
10976 #if 0
10977     int touched_element = MovingOrBlocked2Element(hitx, hity);
10978 #endif
10979 #if 1
10980     boolean object_hit = (!IS_MOVING(hitx, hity) ||
10981                           MovDir[hitx][hity] != direction ||
10982                           ABS(MovPos[hitx][hity]) <= TILEY / 2);
10983
10984     object_hit = TRUE;
10985 #endif
10986
10987     if (object_hit)
10988     {
10989       int i;
10990
10991       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
10992                                CE_SMASHED_BY_SOMETHING, opposite_direction);
10993
10994       CheckElementChangeBySide(x, y, hitting_element, touched_element,
10995                                CE_OTHER_IS_SMASHING, touched_side);
10996
10997       CheckElementChangeBySide(hitx, hity, touched_element, hitting_element,
10998                                CE_OTHER_GETS_SMASHED, hitting_side);
10999     }
11000   }
11001 }
11002 #endif
11003
11004 void TestIfGoodThingHitsBadThing(int good_x, int good_y, int good_move_dir)
11005 {
11006   int i, kill_x = -1, kill_y = -1;
11007
11008   int bad_element = -1;
11009   static int test_xy[4][2] =
11010   {
11011     { 0, -1 },
11012     { -1, 0 },
11013     { +1, 0 },
11014     { 0, +1 }
11015   };
11016   static int test_dir[4] =
11017   {
11018     MV_UP,
11019     MV_LEFT,
11020     MV_RIGHT,
11021     MV_DOWN
11022   };
11023
11024   for (i = 0; i < NUM_DIRECTIONS; i++)
11025   {
11026     int test_x, test_y, test_move_dir, test_element;
11027
11028     test_x = good_x + test_xy[i][0];
11029     test_y = good_y + test_xy[i][1];
11030
11031     if (!IN_LEV_FIELD(test_x, test_y))
11032       continue;
11033
11034     test_move_dir =
11035       (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
11036
11037     test_element = MovingOrBlocked2ElementIfNotLeaving(test_x, test_y);
11038
11039     /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
11040        2nd case: DONT_TOUCH style bad thing does not move away from good thing
11041     */
11042     if ((DONT_RUN_INTO(test_element) && good_move_dir == test_dir[i]) ||
11043         (DONT_TOUCH(test_element)    && test_move_dir != test_dir[i]))
11044     {
11045       kill_x = test_x;
11046       kill_y = test_y;
11047       bad_element = test_element;
11048
11049       break;
11050     }
11051   }
11052
11053   if (kill_x != -1 || kill_y != -1)
11054   {
11055     if (IS_PLAYER(good_x, good_y))
11056     {
11057       struct PlayerInfo *player = PLAYERINFO(good_x, good_y);
11058
11059       if (player->shield_deadly_time_left > 0 &&
11060           !IS_INDESTRUCTIBLE(bad_element))
11061         Bang(kill_x, kill_y);
11062       else if (!PLAYER_ENEMY_PROTECTED(good_x, good_y))
11063         KillPlayer(player);
11064     }
11065     else
11066       Bang(good_x, good_y);
11067   }
11068 }
11069
11070 void TestIfBadThingHitsGoodThing(int bad_x, int bad_y, int bad_move_dir)
11071 {
11072   int i, kill_x = -1, kill_y = -1;
11073   int bad_element = Feld[bad_x][bad_y];
11074   static int test_xy[4][2] =
11075   {
11076     { 0, -1 },
11077     { -1, 0 },
11078     { +1, 0 },
11079     { 0, +1 }
11080   };
11081   static int touch_dir[4] =
11082   {
11083     MV_LEFT | MV_RIGHT,
11084     MV_UP   | MV_DOWN,
11085     MV_UP   | MV_DOWN,
11086     MV_LEFT | MV_RIGHT
11087   };
11088   static int test_dir[4] =
11089   {
11090     MV_UP,
11091     MV_LEFT,
11092     MV_RIGHT,
11093     MV_DOWN
11094   };
11095
11096   if (bad_element == EL_EXPLOSION)      /* skip just exploding bad things */
11097     return;
11098
11099   for (i = 0; i < NUM_DIRECTIONS; i++)
11100   {
11101     int test_x, test_y, test_move_dir, test_element;
11102
11103     test_x = bad_x + test_xy[i][0];
11104     test_y = bad_y + test_xy[i][1];
11105     if (!IN_LEV_FIELD(test_x, test_y))
11106       continue;
11107
11108     test_move_dir =
11109       (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NONE);
11110
11111     test_element = Feld[test_x][test_y];
11112
11113     /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
11114        2nd case: DONT_TOUCH style bad thing does not move away from good thing
11115     */
11116     if ((DONT_RUN_INTO(bad_element) &&  bad_move_dir == test_dir[i]) ||
11117         (DONT_TOUCH(bad_element)    && test_move_dir != test_dir[i]))
11118     {
11119       /* good thing is player or penguin that does not move away */
11120       if (IS_PLAYER(test_x, test_y))
11121       {
11122         struct PlayerInfo *player = PLAYERINFO(test_x, test_y);
11123
11124         if (bad_element == EL_ROBOT && player->is_moving)
11125           continue;     /* robot does not kill player if he is moving */
11126
11127         if (game.engine_version >= VERSION_IDENT(3,0,7,0))
11128         {
11129           if (player->MovPos != 0 && !(player->MovDir & touch_dir[i]))
11130             continue;           /* center and border element do not touch */
11131         }
11132
11133         kill_x = test_x;
11134         kill_y = test_y;
11135         break;
11136       }
11137       else if (test_element == EL_PENGUIN)
11138       {
11139         kill_x = test_x;
11140         kill_y = test_y;
11141         break;
11142       }
11143     }
11144   }
11145
11146   if (kill_x != -1 || kill_y != -1)
11147   {
11148     if (IS_PLAYER(kill_x, kill_y))
11149     {
11150       struct PlayerInfo *player = PLAYERINFO(kill_x, kill_y);
11151
11152       if (player->shield_deadly_time_left > 0 &&
11153           !IS_INDESTRUCTIBLE(bad_element))
11154         Bang(bad_x, bad_y);
11155       else if (!PLAYER_ENEMY_PROTECTED(kill_x, kill_y))
11156         KillPlayer(player);
11157     }
11158     else
11159       Bang(kill_x, kill_y);
11160   }
11161 }
11162
11163 void TestIfPlayerTouchesBadThing(int x, int y)
11164 {
11165   TestIfGoodThingHitsBadThing(x, y, MV_NONE);
11166 }
11167
11168 void TestIfPlayerRunsIntoBadThing(int x, int y, int move_dir)
11169 {
11170   TestIfGoodThingHitsBadThing(x, y, move_dir);
11171 }
11172
11173 void TestIfBadThingTouchesPlayer(int x, int y)
11174 {
11175   TestIfBadThingHitsGoodThing(x, y, MV_NONE);
11176 }
11177
11178 void TestIfBadThingRunsIntoPlayer(int x, int y, int move_dir)
11179 {
11180   TestIfBadThingHitsGoodThing(x, y, move_dir);
11181 }
11182
11183 void TestIfFriendTouchesBadThing(int x, int y)
11184 {
11185   TestIfGoodThingHitsBadThing(x, y, MV_NONE);
11186 }
11187
11188 void TestIfBadThingTouchesFriend(int x, int y)
11189 {
11190   TestIfBadThingHitsGoodThing(x, y, MV_NONE);
11191 }
11192
11193 void TestIfBadThingTouchesOtherBadThing(int bad_x, int bad_y)
11194 {
11195   int i, kill_x = bad_x, kill_y = bad_y;
11196   static int xy[4][2] =
11197   {
11198     { 0, -1 },
11199     { -1, 0 },
11200     { +1, 0 },
11201     { 0, +1 }
11202   };
11203
11204   for (i = 0; i < NUM_DIRECTIONS; i++)
11205   {
11206     int x, y, element;
11207
11208     x = bad_x + xy[i][0];
11209     y = bad_y + xy[i][1];
11210     if (!IN_LEV_FIELD(x, y))
11211       continue;
11212
11213     element = Feld[x][y];
11214     if (IS_AMOEBOID(element) || element == EL_GAME_OF_LIFE ||
11215         element == EL_AMOEBA_GROWING || element == EL_AMOEBA_DROP)
11216     {
11217       kill_x = x;
11218       kill_y = y;
11219       break;
11220     }
11221   }
11222
11223   if (kill_x != bad_x || kill_y != bad_y)
11224     Bang(bad_x, bad_y);
11225 }
11226
11227 void KillPlayer(struct PlayerInfo *player)
11228 {
11229   int jx = player->jx, jy = player->jy;
11230
11231   if (!player->active)
11232     return;
11233
11234   /* remove accessible field at the player's position */
11235   Feld[jx][jy] = EL_EMPTY;
11236
11237   /* deactivate shield (else Bang()/Explode() would not work right) */
11238   player->shield_normal_time_left = 0;
11239   player->shield_deadly_time_left = 0;
11240
11241   Bang(jx, jy);
11242   BuryPlayer(player);
11243 }
11244
11245 static void KillPlayerUnlessEnemyProtected(int x, int y)
11246 {
11247   if (!PLAYER_ENEMY_PROTECTED(x, y))
11248     KillPlayer(PLAYERINFO(x, y));
11249 }
11250
11251 static void KillPlayerUnlessExplosionProtected(int x, int y)
11252 {
11253   if (!PLAYER_EXPLOSION_PROTECTED(x, y))
11254     KillPlayer(PLAYERINFO(x, y));
11255 }
11256
11257 void BuryPlayer(struct PlayerInfo *player)
11258 {
11259   int jx = player->jx, jy = player->jy;
11260
11261   if (!player->active)
11262     return;
11263
11264   PlayLevelSoundElementAction(jx, jy, player->artwork_element, ACTION_DYING);
11265   PlayLevelSound(jx, jy, SND_GAME_LOSING);
11266
11267   player->GameOver = TRUE;
11268   RemovePlayer(player);
11269 }
11270
11271 void RemovePlayer(struct PlayerInfo *player)
11272 {
11273   int jx = player->jx, jy = player->jy;
11274   int i, found = FALSE;
11275
11276   player->present = FALSE;
11277   player->active = FALSE;
11278
11279   if (!ExplodeField[jx][jy])
11280     StorePlayer[jx][jy] = 0;
11281
11282   if (player->is_moving)
11283     DrawLevelField(player->last_jx, player->last_jy);
11284
11285   for (i = 0; i < MAX_PLAYERS; i++)
11286     if (stored_player[i].active)
11287       found = TRUE;
11288
11289   if (!found)
11290     AllPlayersGone = TRUE;
11291
11292   ExitX = ZX = jx;
11293   ExitY = ZY = jy;
11294 }
11295
11296 #if USE_NEW_SNAP_DELAY
11297 static void setFieldForSnapping(int x, int y, int element, int direction)
11298 {
11299   struct ElementInfo *ei = &element_info[element];
11300   int direction_bit = MV_DIR_TO_BIT(direction);
11301   int graphic_snapping = ei->direction_graphic[ACTION_SNAPPING][direction_bit];
11302   int action = (graphic_snapping != IMG_EMPTY_SPACE ? ACTION_SNAPPING :
11303                 IS_DIGGABLE(element) ? ACTION_DIGGING : ACTION_COLLECTING);
11304
11305   Feld[x][y] = EL_ELEMENT_SNAPPING;
11306   MovDelay[x][y] = MOVE_DELAY_NORMAL_SPEED + 1 - 1;
11307
11308   ResetGfxAnimation(x, y);
11309
11310   GfxElement[x][y] = element;
11311   GfxAction[x][y] = action;
11312   GfxDir[x][y] = direction;
11313   GfxFrame[x][y] = -1;
11314 }
11315 #endif
11316
11317 /*
11318   =============================================================================
11319   checkDiagonalPushing()
11320   -----------------------------------------------------------------------------
11321   check if diagonal input device direction results in pushing of object
11322   (by checking if the alternative direction is walkable, diggable, ...)
11323   =============================================================================
11324 */
11325
11326 static boolean checkDiagonalPushing(struct PlayerInfo *player,
11327                                     int x, int y, int real_dx, int real_dy)
11328 {
11329   int jx, jy, dx, dy, xx, yy;
11330
11331   if (real_dx == 0 || real_dy == 0)     /* no diagonal direction => push */
11332     return TRUE;
11333
11334   /* diagonal direction: check alternative direction */
11335   jx = player->jx;
11336   jy = player->jy;
11337   dx = x - jx;
11338   dy = y - jy;
11339   xx = jx + (dx == 0 ? real_dx : 0);
11340   yy = jy + (dy == 0 ? real_dy : 0);
11341
11342   return (!IN_LEV_FIELD(xx, yy) || IS_SOLID_FOR_PUSHING(Feld[xx][yy]));
11343 }
11344
11345 /*
11346   =============================================================================
11347   DigField()
11348   -----------------------------------------------------------------------------
11349   x, y:                 field next to player (non-diagonal) to try to dig to
11350   real_dx, real_dy:     direction as read from input device (can be diagonal)
11351   =============================================================================
11352 */
11353
11354 int DigField(struct PlayerInfo *player,
11355              int oldx, int oldy, int x, int y,
11356              int real_dx, int real_dy, int mode)
11357 {
11358   boolean is_player = (IS_PLAYER(oldx, oldy) || mode != DF_DIG);
11359   boolean player_was_pushing = player->is_pushing;
11360   boolean player_can_move = (!player->cannot_move && mode != DF_SNAP);
11361   boolean player_can_move_or_snap = (!player->cannot_move || mode == DF_SNAP);
11362   int jx = oldx, jy = oldy;
11363   int dx = x - jx, dy = y - jy;
11364   int nextx = x + dx, nexty = y + dy;
11365   int move_direction = (dx == -1 ? MV_LEFT  :
11366                         dx == +1 ? MV_RIGHT :
11367                         dy == -1 ? MV_UP    :
11368                         dy == +1 ? MV_DOWN  : MV_NONE);
11369   int opposite_direction = MV_DIR_OPPOSITE(move_direction);
11370   int dig_side = MV_DIR_OPPOSITE(move_direction);
11371   int old_element = Feld[jx][jy];
11372 #if USE_FIXED_DONT_RUN_INTO
11373   int element = MovingOrBlocked2ElementIfNotLeaving(x, y);
11374 #else
11375   int element;
11376 #endif
11377   int collect_count;
11378
11379   if (is_player)                /* function can also be called by EL_PENGUIN */
11380   {
11381     if (player->MovPos == 0)
11382     {
11383       player->is_digging = FALSE;
11384       player->is_collecting = FALSE;
11385     }
11386
11387     if (player->MovPos == 0)    /* last pushing move finished */
11388       player->is_pushing = FALSE;
11389
11390     if (mode == DF_NO_PUSH)     /* player just stopped pushing */
11391     {
11392       player->is_switching = FALSE;
11393       player->push_delay = -1;
11394
11395       return MP_NO_ACTION;
11396     }
11397   }
11398
11399 #if !USE_FIXED_DONT_RUN_INTO
11400   if (IS_MOVING(x, y) || IS_PLAYER(x, y))
11401     return MP_NO_ACTION;
11402 #endif
11403
11404   if (IS_TUBE(Back[jx][jy]) && game.engine_version >= VERSION_IDENT(2,2,0,0))
11405     old_element = Back[jx][jy];
11406
11407   /* in case of element dropped at player position, check background */
11408   else if (Back[jx][jy] != EL_EMPTY &&
11409            game.engine_version >= VERSION_IDENT(2,2,0,0))
11410     old_element = Back[jx][jy];
11411
11412 #if 0
11413 #if USE_FIXED_DONT_RUN_INTO
11414   if (player_can_move && DONT_RUN_INTO(element))
11415   {
11416     if (element == EL_ACID && dx == 0 && dy == 1)
11417     {
11418       SplashAcid(x, y);
11419       Feld[jx][jy] = EL_PLAYER_1;
11420       InitMovingField(jx, jy, MV_DOWN);
11421       Store[jx][jy] = EL_ACID;
11422       ContinueMoving(jx, jy);
11423       BuryPlayer(player);
11424     }
11425     else
11426       TestIfPlayerRunsIntoBadThing(jx, jy, player->MovDir);
11427
11428     return MP_DONT_RUN_INTO;
11429   }
11430 #endif
11431 #endif
11432
11433 #if 1
11434 #if USE_FIXED_DONT_RUN_INTO
11435   if (player_can_move && DONT_RUN_INTO(element))
11436   {
11437     TestIfPlayerRunsIntoBadThing(jx, jy, player->MovDir);
11438
11439     return MP_DONT_RUN_INTO;
11440   }
11441 #endif
11442 #endif
11443
11444   if (IS_WALKABLE(old_element) && !ACCESS_FROM(old_element, move_direction))
11445     return MP_NO_ACTION;        /* field has no opening in this direction */
11446
11447   if (IS_PASSABLE(old_element) && !ACCESS_FROM(old_element,opposite_direction))
11448     return MP_NO_ACTION;        /* field has no opening in this direction */
11449
11450 #if 1
11451 #if USE_FIXED_DONT_RUN_INTO
11452   if (player_can_move && element == EL_ACID && move_direction == MV_DOWN)
11453   {
11454     SplashAcid(x, y);
11455     Feld[jx][jy] = EL_PLAYER_1;
11456     InitMovingField(jx, jy, MV_DOWN);
11457     Store[jx][jy] = EL_ACID;
11458     ContinueMoving(jx, jy);
11459     BuryPlayer(player);
11460
11461     return MP_DONT_RUN_INTO;
11462   }
11463 #endif
11464 #endif
11465
11466 #if 0
11467 #if USE_FIXED_DONT_RUN_INTO
11468   if (player_can_move && DONT_RUN_INTO(element))
11469   {
11470     if (element == EL_ACID && dx == 0 && dy == 1)
11471     {
11472       SplashAcid(x, y);
11473       Feld[jx][jy] = EL_PLAYER_1;
11474       InitMovingField(jx, jy, MV_DOWN);
11475       Store[jx][jy] = EL_ACID;
11476       ContinueMoving(jx, jy);
11477       BuryPlayer(player);
11478     }
11479     else
11480       TestIfPlayerRunsIntoBadThing(jx, jy, player->MovDir);
11481
11482     return MP_DONT_RUN_INTO;
11483   }
11484 #endif
11485 #endif
11486
11487 #if USE_FIXED_DONT_RUN_INTO
11488   if (IS_MOVING(x, y) || IS_PLAYER(x, y))
11489     return MP_NO_ACTION;
11490 #endif
11491
11492 #if !USE_FIXED_DONT_RUN_INTO
11493   element = Feld[x][y];
11494 #endif
11495
11496   collect_count = element_info[element].collect_count_initial;
11497
11498   if (!is_player && !IS_COLLECTIBLE(element))   /* penguin cannot collect it */
11499     return MP_NO_ACTION;
11500
11501   if (game.engine_version < VERSION_IDENT(2,2,0,0))
11502     player_can_move = player_can_move_or_snap;
11503
11504   if (mode == DF_SNAP && !IS_SNAPPABLE(element) &&
11505       game.engine_version >= VERSION_IDENT(2,2,0,0))
11506   {
11507     CheckElementChangeByPlayer(x, y, element, CE_SNAPPED_BY_PLAYER,
11508                                player->index_bit, dig_side);
11509     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
11510                                         player->index_bit, dig_side);
11511
11512     if (Feld[x][y] != element)          /* field changed by snapping */
11513       return MP_ACTION;
11514
11515     return MP_NO_ACTION;
11516   }
11517
11518   if (game.gravity && is_player && !player->is_auto_moving &&
11519       canFallDown(player) && move_direction != MV_DOWN &&
11520       !canMoveToValidFieldWithGravity(jx, jy, move_direction))
11521     return MP_NO_ACTION;        /* player cannot walk here due to gravity */
11522
11523   if (player_can_move &&
11524       IS_WALKABLE(element) && ACCESS_FROM(element, opposite_direction))
11525   {
11526     int sound_element = SND_ELEMENT(element);
11527     int sound_action = ACTION_WALKING;
11528
11529     if (IS_RND_GATE(element))
11530     {
11531       if (!player->key[RND_GATE_NR(element)])
11532         return MP_NO_ACTION;
11533     }
11534     else if (IS_RND_GATE_GRAY(element))
11535     {
11536       if (!player->key[RND_GATE_GRAY_NR(element)])
11537         return MP_NO_ACTION;
11538     }
11539     else if (IS_RND_GATE_GRAY_ACTIVE(element))
11540     {
11541       if (!player->key[RND_GATE_GRAY_ACTIVE_NR(element)])
11542         return MP_NO_ACTION;
11543     }
11544     else if (element == EL_EXIT_OPEN ||
11545              element == EL_SP_EXIT_OPEN ||
11546              element == EL_SP_EXIT_OPENING)
11547     {
11548       sound_action = ACTION_PASSING;    /* player is passing exit */
11549     }
11550     else if (element == EL_EMPTY)
11551     {
11552       sound_action = ACTION_MOVING;             /* nothing to walk on */
11553     }
11554
11555     /* play sound from background or player, whatever is available */
11556     if (element_info[sound_element].sound[sound_action] != SND_UNDEFINED)
11557       PlayLevelSoundElementAction(x, y, sound_element, sound_action);
11558     else
11559       PlayLevelSoundElementAction(x, y, player->artwork_element, sound_action);
11560   }
11561   else if (player_can_move &&
11562            IS_PASSABLE(element) && canPassField(x, y, move_direction))
11563   {
11564     if (!ACCESS_FROM(element, opposite_direction))
11565       return MP_NO_ACTION;      /* field not accessible from this direction */
11566
11567     if (CAN_MOVE(element))      /* only fixed elements can be passed! */
11568       return MP_NO_ACTION;
11569
11570     if (IS_EM_GATE(element))
11571     {
11572       if (!player->key[EM_GATE_NR(element)])
11573         return MP_NO_ACTION;
11574     }
11575     else if (IS_EM_GATE_GRAY(element))
11576     {
11577       if (!player->key[EM_GATE_GRAY_NR(element)])
11578         return MP_NO_ACTION;
11579     }
11580     else if (IS_EM_GATE_GRAY_ACTIVE(element))
11581     {
11582       if (!player->key[EM_GATE_GRAY_ACTIVE_NR(element)])
11583         return MP_NO_ACTION;
11584     }
11585     else if (IS_SP_PORT(element))
11586     {
11587       if (element == EL_SP_GRAVITY_PORT_LEFT ||
11588           element == EL_SP_GRAVITY_PORT_RIGHT ||
11589           element == EL_SP_GRAVITY_PORT_UP ||
11590           element == EL_SP_GRAVITY_PORT_DOWN)
11591         game.gravity = !game.gravity;
11592       else if (element == EL_SP_GRAVITY_ON_PORT_LEFT ||
11593                element == EL_SP_GRAVITY_ON_PORT_RIGHT ||
11594                element == EL_SP_GRAVITY_ON_PORT_UP ||
11595                element == EL_SP_GRAVITY_ON_PORT_DOWN)
11596         game.gravity = TRUE;
11597       else if (element == EL_SP_GRAVITY_OFF_PORT_LEFT ||
11598                element == EL_SP_GRAVITY_OFF_PORT_RIGHT ||
11599                element == EL_SP_GRAVITY_OFF_PORT_UP ||
11600                element == EL_SP_GRAVITY_OFF_PORT_DOWN)
11601         game.gravity = FALSE;
11602     }
11603
11604     /* automatically move to the next field with double speed */
11605     player->programmed_action = move_direction;
11606
11607     if (player->move_delay_reset_counter == 0)
11608     {
11609       player->move_delay_reset_counter = 2;     /* two double speed steps */
11610
11611       DOUBLE_PLAYER_SPEED(player);
11612     }
11613
11614     PlayLevelSoundAction(x, y, ACTION_PASSING);
11615   }
11616   else if (player_can_move_or_snap && IS_DIGGABLE(element))
11617   {
11618     RemoveField(x, y);
11619
11620     if (mode != DF_SNAP)
11621     {
11622       GfxElement[x][y] = GFX_ELEMENT(element);
11623       player->is_digging = TRUE;
11624     }
11625
11626     PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
11627
11628     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_DIGS_X,
11629                                         player->index_bit, dig_side);
11630
11631     if (mode == DF_SNAP)
11632     {
11633 #if USE_NEW_SNAP_DELAY
11634       if (level.block_snap_field)
11635         setFieldForSnapping(x, y, element, move_direction);
11636       else
11637         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
11638 #else
11639       TestIfElementTouchesCustomElement(x, y);          /* for empty space */
11640 #endif
11641
11642       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
11643                                           player->index_bit, dig_side);
11644     }
11645   }
11646   else if (player_can_move_or_snap && IS_COLLECTIBLE(element))
11647   {
11648     RemoveField(x, y);
11649
11650     if (is_player && mode != DF_SNAP)
11651     {
11652       GfxElement[x][y] = element;
11653       player->is_collecting = TRUE;
11654     }
11655
11656     if (element == EL_SPEED_PILL)
11657     {
11658       player->move_delay_value = MOVE_DELAY_HIGH_SPEED;
11659     }
11660     else if (element == EL_EXTRA_TIME && level.time > 0)
11661     {
11662       TimeLeft += level.extra_time;
11663       DrawGameValue_Time(TimeLeft);
11664     }
11665     else if (element == EL_SHIELD_NORMAL || element == EL_SHIELD_DEADLY)
11666     {
11667       player->shield_normal_time_left += level.shield_normal_time;
11668       if (element == EL_SHIELD_DEADLY)
11669         player->shield_deadly_time_left += level.shield_deadly_time;
11670     }
11671     else if (element == EL_DYNAMITE ||
11672              element == EL_EM_DYNAMITE ||
11673              element == EL_SP_DISK_RED)
11674     {
11675       if (player->inventory_size < MAX_INVENTORY_SIZE)
11676         player->inventory_element[player->inventory_size++] = element;
11677
11678 #if 1
11679       DrawGameDoorValues();
11680 #else
11681       DrawGameValue_Dynamite(local_player->inventory_size);
11682 #endif
11683     }
11684     else if (element == EL_DYNABOMB_INCREASE_NUMBER)
11685     {
11686       player->dynabomb_count++;
11687       player->dynabombs_left++;
11688     }
11689     else if (element == EL_DYNABOMB_INCREASE_SIZE)
11690     {
11691       player->dynabomb_size++;
11692     }
11693     else if (element == EL_DYNABOMB_INCREASE_POWER)
11694     {
11695       player->dynabomb_xl = TRUE;
11696     }
11697     else if (IS_KEY(element))
11698     {
11699       player->key[KEY_NR(element)] = TRUE;
11700
11701 #if 1
11702       DrawGameDoorValues();
11703 #else
11704       DrawGameValue_Keys(player->key);
11705 #endif
11706
11707       redraw_mask |= REDRAW_DOOR_1;
11708     }
11709     else if (IS_ENVELOPE(element))
11710     {
11711       player->show_envelope = element;
11712     }
11713     else if (element == EL_EMC_LENSES)
11714     {
11715       game.lenses_time_left = level.lenses_time * FRAMES_PER_SECOND;
11716
11717       RedrawAllInvisibleElementsForLenses();
11718     }
11719     else if (element == EL_EMC_MAGNIFIER)
11720     {
11721       game.magnify_time_left = level.magnify_time * FRAMES_PER_SECOND;
11722
11723       RedrawAllInvisibleElementsForMagnifier();
11724     }
11725     else if (IS_DROPPABLE(element) ||
11726              IS_THROWABLE(element))     /* can be collected and dropped */
11727     {
11728       int i;
11729
11730       if (collect_count == 0)
11731         player->inventory_infinite_element = element;
11732       else
11733         for (i = 0; i < collect_count; i++)
11734           if (player->inventory_size < MAX_INVENTORY_SIZE)
11735             player->inventory_element[player->inventory_size++] = element;
11736
11737 #if 1
11738       DrawGameDoorValues();
11739 #else
11740       DrawGameValue_Dynamite(local_player->inventory_size);
11741 #endif
11742     }
11743     else if (collect_count > 0)
11744     {
11745       local_player->gems_still_needed -= collect_count;
11746       if (local_player->gems_still_needed < 0)
11747         local_player->gems_still_needed = 0;
11748
11749       DrawGameValue_Emeralds(local_player->gems_still_needed);
11750     }
11751
11752     RaiseScoreElement(element);
11753     PlayLevelSoundElementAction(x, y, element, ACTION_COLLECTING);
11754
11755     if (is_player)
11756       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_COLLECTS_X,
11757                                           player->index_bit, dig_side);
11758
11759     if (mode == DF_SNAP)
11760     {
11761 #if USE_NEW_SNAP_DELAY
11762       if (level.block_snap_field)
11763         setFieldForSnapping(x, y, element, move_direction);
11764       else
11765         TestIfElementTouchesCustomElement(x, y);        /* for empty space */
11766 #else
11767       TestIfElementTouchesCustomElement(x, y);          /* for empty space */
11768 #endif
11769
11770       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SNAPS_X,
11771                                           player->index_bit, dig_side);
11772     }
11773   }
11774   else if (player_can_move_or_snap && IS_PUSHABLE(element))
11775   {
11776     if (mode == DF_SNAP && element != EL_BD_ROCK)
11777       return MP_NO_ACTION;
11778
11779     if (CAN_FALL(element) && dy)
11780       return MP_NO_ACTION;
11781
11782     if (CAN_FALL(element) && IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1) &&
11783         !(element == EL_SPRING && level.use_spring_bug))
11784       return MP_NO_ACTION;
11785
11786     if (CAN_MOVE(element) && GET_MAX_MOVE_DELAY(element) == 0 &&
11787         ((move_direction & MV_VERTICAL &&
11788           ((element_info[element].move_pattern & MV_LEFT &&
11789             IN_LEV_FIELD(x - 1, y) && IS_FREE(x - 1, y)) ||
11790            (element_info[element].move_pattern & MV_RIGHT &&
11791             IN_LEV_FIELD(x + 1, y) && IS_FREE(x + 1, y)))) ||
11792          (move_direction & MV_HORIZONTAL &&
11793           ((element_info[element].move_pattern & MV_UP &&
11794             IN_LEV_FIELD(x, y - 1) && IS_FREE(x, y - 1)) ||
11795            (element_info[element].move_pattern & MV_DOWN &&
11796             IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1))))))
11797       return MP_NO_ACTION;
11798
11799     /* do not push elements already moving away faster than player */
11800     if (CAN_MOVE(element) && MovDir[x][y] == move_direction &&
11801         ABS(getElementMoveStepsize(x, y)) > MOVE_STEPSIZE_NORMAL)
11802       return MP_NO_ACTION;
11803
11804     if (game.engine_version >= VERSION_IDENT(3,1,0,0))
11805     {
11806       if (player->push_delay_value == -1 || !player_was_pushing)
11807         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
11808     }
11809     else if (game.engine_version >= VERSION_IDENT(3,0,7,1))
11810     {
11811       if (player->push_delay_value == -1)
11812         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
11813     }
11814     else if (game.engine_version >= VERSION_IDENT(2,2,0,7))
11815     {
11816       if (!player->is_pushing)
11817         player->push_delay_value = GET_NEW_PUSH_DELAY(element);
11818     }
11819
11820     player->is_pushing = TRUE;
11821
11822     if (!(IN_LEV_FIELD(nextx, nexty) &&
11823           (IS_FREE(nextx, nexty) ||
11824            (Feld[nextx][nexty] == EL_SOKOBAN_FIELD_EMPTY &&
11825             IS_SB_ELEMENT(element)))))
11826       return MP_NO_ACTION;
11827
11828     if (!checkDiagonalPushing(player, x, y, real_dx, real_dy))
11829       return MP_NO_ACTION;
11830
11831     if (player->push_delay == -1)       /* new pushing; restart delay */
11832       player->push_delay = 0;
11833
11834     if (player->push_delay < player->push_delay_value &&
11835         !(tape.playing && tape.file_version < FILE_VERSION_2_0) &&
11836         element != EL_SPRING && element != EL_BALLOON)
11837     {
11838       /* make sure that there is no move delay before next try to push */
11839       if (game.engine_version >= VERSION_IDENT(3,0,7,1))
11840         player->move_delay = 0;
11841
11842       return MP_NO_ACTION;
11843     }
11844
11845     if (IS_SB_ELEMENT(element))
11846     {
11847       if (element == EL_SOKOBAN_FIELD_FULL)
11848       {
11849         Back[x][y] = EL_SOKOBAN_FIELD_EMPTY;
11850         local_player->sokobanfields_still_needed++;
11851       }
11852
11853       if (Feld[nextx][nexty] == EL_SOKOBAN_FIELD_EMPTY)
11854       {
11855         Back[nextx][nexty] = EL_SOKOBAN_FIELD_EMPTY;
11856         local_player->sokobanfields_still_needed--;
11857       }
11858
11859       Feld[x][y] = EL_SOKOBAN_OBJECT;
11860
11861       if (Back[x][y] == Back[nextx][nexty])
11862         PlayLevelSoundAction(x, y, ACTION_PUSHING);
11863       else if (Back[x][y] != 0)
11864         PlayLevelSoundElementAction(x, y, EL_SOKOBAN_FIELD_FULL,
11865                                     ACTION_EMPTYING);
11866       else
11867         PlayLevelSoundElementAction(nextx, nexty, EL_SOKOBAN_FIELD_EMPTY,
11868                                     ACTION_FILLING);
11869
11870       if (local_player->sokobanfields_still_needed == 0 &&
11871           game.emulation == EMU_SOKOBAN)
11872       {
11873         player->LevelSolved = player->GameOver = TRUE;
11874         PlayLevelSound(x, y, SND_GAME_SOKOBAN_SOLVING);
11875       }
11876     }
11877     else
11878       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
11879
11880     InitMovingField(x, y, move_direction);
11881     GfxAction[x][y] = ACTION_PUSHING;
11882
11883     if (mode == DF_SNAP)
11884       ContinueMoving(x, y);
11885     else
11886       MovPos[x][y] = (dx != 0 ? dx : dy);
11887
11888     Pushed[x][y] = TRUE;
11889     Pushed[nextx][nexty] = TRUE;
11890
11891     if (game.engine_version < VERSION_IDENT(2,2,0,7))
11892       player->push_delay_value = GET_NEW_PUSH_DELAY(element);
11893     else
11894       player->push_delay_value = -1;    /* get new value later */
11895
11896     /* check for element change _after_ element has been pushed */
11897     if (game.use_change_when_pushing_bug)
11898     {
11899       CheckElementChangeByPlayer(x, y, element, CE_PUSHED_BY_PLAYER,
11900                                  player->index_bit, dig_side);
11901       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PUSHES_X,
11902                                           player->index_bit, dig_side);
11903     }
11904   }
11905   else if (IS_SWITCHABLE(element))
11906   {
11907     if (PLAYER_SWITCHING(player, x, y))
11908     {
11909       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
11910                                           player->index_bit, dig_side);
11911
11912       return MP_ACTION;
11913     }
11914
11915     player->is_switching = TRUE;
11916     player->switch_x = x;
11917     player->switch_y = y;
11918
11919     PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVATING);
11920
11921     if (element == EL_ROBOT_WHEEL)
11922     {
11923       Feld[x][y] = EL_ROBOT_WHEEL_ACTIVE;
11924       ZX = x;
11925       ZY = y;
11926
11927       DrawLevelField(x, y);
11928     }
11929     else if (element == EL_SP_TERMINAL)
11930     {
11931       int xx, yy;
11932
11933 #if 1
11934       SCAN_PLAYFIELD(xx, yy)
11935 #else
11936       for (yy = 0; yy < lev_fieldy; yy++) for (xx = 0; xx < lev_fieldx; xx++)
11937 #endif
11938       {
11939         if (Feld[xx][yy] == EL_SP_DISK_YELLOW)
11940           Bang(xx, yy);
11941         else if (Feld[xx][yy] == EL_SP_TERMINAL)
11942           Feld[xx][yy] = EL_SP_TERMINAL_ACTIVE;
11943       }
11944     }
11945     else if (IS_BELT_SWITCH(element))
11946     {
11947       ToggleBeltSwitch(x, y);
11948     }
11949     else if (element == EL_SWITCHGATE_SWITCH_UP ||
11950              element == EL_SWITCHGATE_SWITCH_DOWN)
11951     {
11952       ToggleSwitchgateSwitch(x, y);
11953     }
11954     else if (element == EL_LIGHT_SWITCH ||
11955              element == EL_LIGHT_SWITCH_ACTIVE)
11956     {
11957       ToggleLightSwitch(x, y);
11958     }
11959     else if (element == EL_TIMEGATE_SWITCH)
11960     {
11961       ActivateTimegateSwitch(x, y);
11962     }
11963     else if (element == EL_BALLOON_SWITCH_LEFT  ||
11964              element == EL_BALLOON_SWITCH_RIGHT ||
11965              element == EL_BALLOON_SWITCH_UP    ||
11966              element == EL_BALLOON_SWITCH_DOWN  ||
11967              element == EL_BALLOON_SWITCH_NONE  ||
11968              element == EL_BALLOON_SWITCH_ANY)
11969     {
11970       game.wind_direction = (element == EL_BALLOON_SWITCH_LEFT  ? MV_LEFT  :
11971                              element == EL_BALLOON_SWITCH_RIGHT ? MV_RIGHT :
11972                              element == EL_BALLOON_SWITCH_UP    ? MV_UP    :
11973                              element == EL_BALLOON_SWITCH_DOWN  ? MV_DOWN  :
11974                              element == EL_BALLOON_SWITCH_NONE  ? MV_NONE  :
11975                              move_direction);
11976     }
11977     else if (element == EL_LAMP)
11978     {
11979       Feld[x][y] = EL_LAMP_ACTIVE;
11980       local_player->lights_still_needed--;
11981
11982       ResetGfxAnimation(x, y);
11983       DrawLevelField(x, y);
11984     }
11985     else if (element == EL_TIME_ORB_FULL)
11986     {
11987       Feld[x][y] = EL_TIME_ORB_EMPTY;
11988
11989       if (level.time > 0 || level.use_time_orb_bug)
11990       {
11991         TimeLeft += level.time_orb_time;
11992         DrawGameValue_Time(TimeLeft);
11993       }
11994
11995       ResetGfxAnimation(x, y);
11996       DrawLevelField(x, y);
11997     }
11998     else if (element == EL_EMC_MAGIC_BALL_SWITCH ||
11999              element == EL_EMC_MAGIC_BALL_SWITCH_ACTIVE)
12000     {
12001       int xx, yy;
12002
12003       game.ball_state = !game.ball_state;
12004
12005 #if 1
12006       SCAN_PLAYFIELD(xx, yy)
12007 #else
12008       for (yy = 0; yy < lev_fieldy; yy++) for (xx = 0; xx < lev_fieldx; xx++)
12009 #endif
12010       {
12011         int e = Feld[xx][yy];
12012
12013         if (game.ball_state)
12014         {
12015           if (e == EL_EMC_MAGIC_BALL)
12016             CreateField(xx, yy, EL_EMC_MAGIC_BALL_ACTIVE);
12017           else if (e == EL_EMC_MAGIC_BALL_SWITCH)
12018             CreateField(xx, yy, EL_EMC_MAGIC_BALL_SWITCH_ACTIVE);
12019         }
12020         else
12021         {
12022           if (e == EL_EMC_MAGIC_BALL_ACTIVE)
12023             CreateField(xx, yy, EL_EMC_MAGIC_BALL);
12024           else if (e == EL_EMC_MAGIC_BALL_SWITCH_ACTIVE)
12025             CreateField(xx, yy, EL_EMC_MAGIC_BALL_SWITCH);
12026         }
12027       }
12028     }
12029
12030     CheckTriggeredElementChangeByPlayer(x, y, element, CE_SWITCH_OF_X,
12031                                         player->index_bit, dig_side);
12032
12033     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SWITCHES_X,
12034                                         player->index_bit, dig_side);
12035
12036     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
12037                                         player->index_bit, dig_side);
12038
12039     return MP_ACTION;
12040   }
12041   else
12042   {
12043     if (!PLAYER_SWITCHING(player, x, y))
12044     {
12045       player->is_switching = TRUE;
12046       player->switch_x = x;
12047       player->switch_y = y;
12048
12049       CheckElementChangeByPlayer(x, y, element, CE_SWITCHED,
12050                                  player->index_bit, dig_side);
12051       CheckTriggeredElementChangeByPlayer(x, y, element, CE_SWITCH_OF_X,
12052                                           player->index_bit, dig_side);
12053
12054       CheckElementChangeByPlayer(x, y, element, CE_SWITCHED_BY_PLAYER,
12055                                  player->index_bit, dig_side);
12056       CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_SWITCHES_X,
12057                                           player->index_bit, dig_side);
12058     }
12059
12060     CheckElementChangeByPlayer(x, y, element, CE_PRESSED_BY_PLAYER,
12061                                player->index_bit, dig_side);
12062     CheckTriggeredElementChangeByPlayer(x, y, element, CE_PLAYER_PRESSES_X,
12063                                         player->index_bit, dig_side);
12064
12065     return MP_NO_ACTION;
12066   }
12067
12068   player->push_delay = -1;
12069
12070   if (is_player)                /* function can also be called by EL_PENGUIN */
12071   {
12072     if (Feld[x][y] != element)          /* really digged/collected something */
12073       player->is_collecting = !player->is_digging;
12074   }
12075
12076   return MP_MOVING;
12077 }
12078
12079 boolean SnapField(struct PlayerInfo *player, int dx, int dy)
12080 {
12081   int jx = player->jx, jy = player->jy;
12082   int x = jx + dx, y = jy + dy;
12083   int snap_direction = (dx == -1 ? MV_LEFT  :
12084                         dx == +1 ? MV_RIGHT :
12085                         dy == -1 ? MV_UP    :
12086                         dy == +1 ? MV_DOWN  : MV_NONE);
12087   boolean can_continue_snapping = (level.continuous_snapping &&
12088                                    WasJustFalling[x][y] < CHECK_DELAY_FALLING);
12089
12090   if (player->MovPos != 0 && game.engine_version >= VERSION_IDENT(2,2,0,0))
12091     return FALSE;
12092
12093   if (!player->active || !IN_LEV_FIELD(x, y))
12094     return FALSE;
12095
12096   if (dx && dy)
12097     return FALSE;
12098
12099   if (!dx && !dy)
12100   {
12101     if (player->MovPos == 0)
12102       player->is_pushing = FALSE;
12103
12104     player->is_snapping = FALSE;
12105
12106     if (player->MovPos == 0)
12107     {
12108       player->is_moving = FALSE;
12109       player->is_digging = FALSE;
12110       player->is_collecting = FALSE;
12111     }
12112
12113     return FALSE;
12114   }
12115
12116 #if USE_NEW_CONTINUOUS_SNAPPING
12117   /* prevent snapping with already pressed snap key when not allowed */
12118   if (player->is_snapping && !can_continue_snapping)
12119     return FALSE;
12120 #else
12121   if (player->is_snapping)
12122     return FALSE;
12123 #endif
12124
12125   player->MovDir = snap_direction;
12126
12127   if (player->MovPos == 0)
12128   {
12129     player->is_moving = FALSE;
12130     player->is_digging = FALSE;
12131     player->is_collecting = FALSE;
12132   }
12133
12134   player->is_dropping = FALSE;
12135   player->is_dropping_pressed = FALSE;
12136   player->drop_pressed_delay = 0;
12137
12138   if (DigField(player, jx, jy, x, y, 0, 0, DF_SNAP) == MP_NO_ACTION)
12139     return FALSE;
12140
12141   player->is_snapping = TRUE;
12142
12143   if (player->MovPos == 0)
12144   {
12145     player->is_moving = FALSE;
12146     player->is_digging = FALSE;
12147     player->is_collecting = FALSE;
12148   }
12149
12150   if (player->MovPos != 0)      /* prevent graphic bugs in versions < 2.2.0 */
12151     DrawLevelField(player->last_jx, player->last_jy);
12152
12153   DrawLevelField(x, y);
12154
12155   return TRUE;
12156 }
12157
12158 boolean DropElement(struct PlayerInfo *player)
12159 {
12160   int old_element, new_element;
12161   int dropx = player->jx, dropy = player->jy;
12162   int drop_direction = player->MovDir;
12163   int drop_side = drop_direction;
12164   int drop_element = (player->inventory_size > 0 ?
12165                       player->inventory_element[player->inventory_size - 1] :
12166                       player->inventory_infinite_element != EL_UNDEFINED ?
12167                       player->inventory_infinite_element :
12168                       player->dynabombs_left > 0 ?
12169                       EL_DYNABOMB_PLAYER_1_ACTIVE + player->index_nr :
12170                       EL_UNDEFINED);
12171
12172   player->is_dropping_pressed = TRUE;
12173
12174   /* do not drop an element on top of another element; when holding drop key
12175      pressed without moving, dropped element must move away before the next
12176      element can be dropped (this is especially important if the next element
12177      is dynamite, which can be placed on background for historical reasons) */
12178   if (PLAYER_DROPPING(player, dropx, dropy) && Feld[dropx][dropy] != EL_EMPTY)
12179     return MP_ACTION;
12180
12181   if (IS_THROWABLE(drop_element))
12182   {
12183     dropx += GET_DX_FROM_DIR(drop_direction);
12184     dropy += GET_DY_FROM_DIR(drop_direction);
12185
12186     if (!IN_LEV_FIELD(dropx, dropy))
12187       return FALSE;
12188   }
12189
12190   old_element = Feld[dropx][dropy];     /* old element at dropping position */
12191   new_element = drop_element;           /* default: no change when dropping */
12192
12193   /* check if player is active, not moving and ready to drop */
12194   if (!player->active || player->MovPos || player->drop_delay > 0)
12195     return FALSE;
12196
12197   /* check if player has anything that can be dropped */
12198   if (new_element == EL_UNDEFINED)
12199     return FALSE;
12200
12201   /* check if drop key was pressed long enough for EM style dynamite */
12202   if (new_element == EL_EM_DYNAMITE && player->drop_pressed_delay < 40)
12203     return FALSE;
12204
12205   /* check if anything can be dropped at the current position */
12206   if (IS_ACTIVE_BOMB(old_element) || old_element == EL_EXPLOSION)
12207     return FALSE;
12208
12209   /* collected custom elements can only be dropped on empty fields */
12210   if (IS_CUSTOM_ELEMENT(new_element) && old_element != EL_EMPTY)
12211     return FALSE;
12212
12213   if (old_element != EL_EMPTY)
12214     Back[dropx][dropy] = old_element;   /* store old element on this field */
12215
12216   ResetGfxAnimation(dropx, dropy);
12217   ResetRandomAnimationValue(dropx, dropy);
12218
12219   if (player->inventory_size > 0 ||
12220       player->inventory_infinite_element != EL_UNDEFINED)
12221   {
12222     if (player->inventory_size > 0)
12223     {
12224       player->inventory_size--;
12225
12226 #if 1
12227       DrawGameDoorValues();
12228 #else
12229       DrawGameValue_Dynamite(local_player->inventory_size);
12230 #endif
12231
12232       if (new_element == EL_DYNAMITE)
12233         new_element = EL_DYNAMITE_ACTIVE;
12234       else if (new_element == EL_EM_DYNAMITE)
12235         new_element = EL_EM_DYNAMITE_ACTIVE;
12236       else if (new_element == EL_SP_DISK_RED)
12237         new_element = EL_SP_DISK_RED_ACTIVE;
12238     }
12239
12240     Feld[dropx][dropy] = new_element;
12241
12242     if (IN_SCR_FIELD(SCREENX(dropx), SCREENY(dropy)))
12243       DrawGraphicThruMask(SCREENX(dropx), SCREENY(dropy),
12244                           el2img(Feld[dropx][dropy]), 0);
12245
12246     PlayLevelSoundAction(dropx, dropy, ACTION_DROPPING);
12247
12248     /* needed if previous element just changed to "empty" in the last frame */
12249     ChangeCount[dropx][dropy] = 0;      /* allow at least one more change */
12250
12251     CheckElementChangeByPlayer(dropx, dropy, new_element, CE_DROPPED_BY_PLAYER,
12252                                player->index_bit, drop_side);
12253     CheckTriggeredElementChangeByPlayer(dropx, dropy, new_element,
12254                                         CE_PLAYER_DROPS_X,
12255                                         player->index_bit, drop_side);
12256
12257     TestIfElementTouchesCustomElement(dropx, dropy);
12258   }
12259   else          /* player is dropping a dyna bomb */
12260   {
12261     player->dynabombs_left--;
12262
12263     Feld[dropx][dropy] = new_element;
12264
12265     if (IN_SCR_FIELD(SCREENX(dropx), SCREENY(dropy)))
12266       DrawGraphicThruMask(SCREENX(dropx), SCREENY(dropy),
12267                           el2img(Feld[dropx][dropy]), 0);
12268
12269     PlayLevelSoundAction(dropx, dropy, ACTION_DROPPING);
12270   }
12271
12272   if (Feld[dropx][dropy] == new_element) /* uninitialized unless CE change */
12273     InitField_WithBug1(dropx, dropy, FALSE);
12274
12275   new_element = Feld[dropx][dropy];     /* element might have changed */
12276
12277   if (IS_CUSTOM_ELEMENT(new_element) && CAN_MOVE(new_element) &&
12278       element_info[new_element].move_pattern == MV_WHEN_DROPPED)
12279   {
12280     int move_direction, nextx, nexty;
12281
12282     if (element_info[new_element].move_direction_initial == MV_START_AUTOMATIC)
12283       MovDir[dropx][dropy] = drop_direction;
12284
12285     move_direction = MovDir[dropx][dropy];
12286     nextx = dropx + GET_DX_FROM_DIR(move_direction);
12287     nexty = dropy + GET_DY_FROM_DIR(move_direction);
12288
12289     ChangeCount[dropx][dropy] = 0;      /* allow at least one more change */
12290     CheckCollision[dropx][dropy] = CHECK_DELAY_COLLISION;
12291   }
12292
12293   player->drop_delay = GET_NEW_DROP_DELAY(drop_element);
12294   player->is_dropping = TRUE;
12295
12296   player->drop_pressed_delay = 0;
12297   player->is_dropping_pressed = FALSE;
12298
12299   player->drop_x = dropx;
12300   player->drop_y = dropy;
12301
12302   return TRUE;
12303 }
12304
12305 /* ------------------------------------------------------------------------- */
12306 /* game sound playing functions                                              */
12307 /* ------------------------------------------------------------------------- */
12308
12309 static int *loop_sound_frame = NULL;
12310 static int *loop_sound_volume = NULL;
12311
12312 void InitPlayLevelSound()
12313 {
12314   int num_sounds = getSoundListSize();
12315
12316   checked_free(loop_sound_frame);
12317   checked_free(loop_sound_volume);
12318
12319   loop_sound_frame  = checked_calloc(num_sounds * sizeof(int));
12320   loop_sound_volume = checked_calloc(num_sounds * sizeof(int));
12321 }
12322
12323 static void PlayLevelSound(int x, int y, int nr)
12324 {
12325   int sx = SCREENX(x), sy = SCREENY(y);
12326   int volume, stereo_position;
12327   int max_distance = 8;
12328   int type = (IS_LOOP_SOUND(nr) ? SND_CTRL_PLAY_LOOP : SND_CTRL_PLAY_SOUND);
12329
12330   if ((!setup.sound_simple && !IS_LOOP_SOUND(nr)) ||
12331       (!setup.sound_loops && IS_LOOP_SOUND(nr)))
12332     return;
12333
12334   if (!IN_LEV_FIELD(x, y) ||
12335       sx < -max_distance || sx >= SCR_FIELDX + max_distance ||
12336       sy < -max_distance || sy >= SCR_FIELDY + max_distance)
12337     return;
12338
12339   volume = SOUND_MAX_VOLUME;
12340
12341   if (!IN_SCR_FIELD(sx, sy))
12342   {
12343     int dx = ABS(sx - SCR_FIELDX / 2) - SCR_FIELDX / 2;
12344     int dy = ABS(sy - SCR_FIELDY / 2) - SCR_FIELDY / 2;
12345
12346     volume -= volume * (dx > dy ? dx : dy) / max_distance;
12347   }
12348
12349   stereo_position = (SOUND_MAX_LEFT +
12350                      (sx + max_distance) * SOUND_MAX_LEFT2RIGHT /
12351                      (SCR_FIELDX + 2 * max_distance));
12352
12353   if (IS_LOOP_SOUND(nr))
12354   {
12355     /* This assures that quieter loop sounds do not overwrite louder ones,
12356        while restarting sound volume comparison with each new game frame. */
12357
12358     if (loop_sound_volume[nr] > volume && loop_sound_frame[nr] == FrameCounter)
12359       return;
12360
12361     loop_sound_volume[nr] = volume;
12362     loop_sound_frame[nr] = FrameCounter;
12363   }
12364
12365   PlaySoundExt(nr, volume, stereo_position, type);
12366 }
12367
12368 static void PlayLevelSoundNearest(int x, int y, int sound_action)
12369 {
12370   PlayLevelSound(x < LEVELX(BX1) ? LEVELX(BX1) :
12371                  x > LEVELX(BX2) ? LEVELX(BX2) : x,
12372                  y < LEVELY(BY1) ? LEVELY(BY1) :
12373                  y > LEVELY(BY2) ? LEVELY(BY2) : y,
12374                  sound_action);
12375 }
12376
12377 static void PlayLevelSoundAction(int x, int y, int action)
12378 {
12379   PlayLevelSoundElementAction(x, y, Feld[x][y], action);
12380 }
12381
12382 static void PlayLevelSoundElementAction(int x, int y, int element, int action)
12383 {
12384   int sound_effect = element_info[SND_ELEMENT(element)].sound[action];
12385
12386   if (sound_effect != SND_UNDEFINED)
12387     PlayLevelSound(x, y, sound_effect);
12388 }
12389
12390 static void PlayLevelSoundElementActionIfLoop(int x, int y, int element,
12391                                               int action)
12392 {
12393   int sound_effect = element_info[SND_ELEMENT(element)].sound[action];
12394
12395   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
12396     PlayLevelSound(x, y, sound_effect);
12397 }
12398
12399 static void PlayLevelSoundActionIfLoop(int x, int y, int action)
12400 {
12401   int sound_effect = element_info[SND_ELEMENT(Feld[x][y])].sound[action];
12402
12403   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
12404     PlayLevelSound(x, y, sound_effect);
12405 }
12406
12407 static void StopLevelSoundActionIfLoop(int x, int y, int action)
12408 {
12409   int sound_effect = element_info[SND_ELEMENT(Feld[x][y])].sound[action];
12410
12411   if (sound_effect != SND_UNDEFINED && IS_LOOP_SOUND(sound_effect))
12412     StopSound(sound_effect);
12413 }
12414
12415 static void PlayLevelMusic()
12416 {
12417   if (levelset.music[level_nr] != MUS_UNDEFINED)
12418     PlayMusic(levelset.music[level_nr]);        /* from config file */
12419   else
12420     PlayMusic(MAP_NOCONF_MUSIC(level_nr));      /* from music dir */
12421 }
12422
12423 void PlayLevelSound_EM(int x, int y, int element_em, int sample)
12424 {
12425   int element = (element_em > -1 ? map_element_EM_to_RND(element_em) : 0);
12426
12427   switch (sample)
12428   {
12429     case SAMPLE_blank:
12430       PlayLevelSoundElementAction(x, y, element, ACTION_WALKING);
12431       break;
12432
12433     case SAMPLE_roll:
12434       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
12435       break;
12436
12437     case SAMPLE_stone:
12438       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
12439       break;
12440
12441     case SAMPLE_nut:
12442       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
12443       break;
12444
12445     case SAMPLE_crack:
12446       PlayLevelSoundElementAction(x, y, element, ACTION_BREAKING);
12447       break;
12448
12449     case SAMPLE_bug:
12450       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
12451       break;
12452
12453     case SAMPLE_tank:
12454       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
12455       break;
12456
12457     case SAMPLE_android_clone:
12458       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
12459       break;
12460
12461     case SAMPLE_android_move:
12462       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
12463       break;
12464
12465     case SAMPLE_spring:
12466       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
12467       break;
12468
12469     case SAMPLE_slurp:
12470       PlayLevelSoundElementAction(x, y, element, ACTION_EATING);
12471       break;
12472
12473     case SAMPLE_eater:
12474       PlayLevelSoundElementAction(x, y, element, ACTION_WAITING);
12475       break;
12476
12477     case SAMPLE_eater_eat:
12478       PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
12479       break;
12480
12481     case SAMPLE_alien:
12482       PlayLevelSoundElementAction(x, y, element, ACTION_MOVING);
12483       break;
12484
12485     case SAMPLE_collect:
12486       PlayLevelSoundElementAction(x, y, element, ACTION_COLLECTING);
12487       break;
12488
12489     case SAMPLE_diamond:
12490       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
12491       break;
12492
12493     case SAMPLE_squash:
12494       /* !!! CHECK THIS !!! */
12495 #if 1
12496       PlayLevelSoundElementAction(x, y, element, ACTION_BREAKING);
12497 #else
12498       PlayLevelSoundElementAction(x, y, element, ACTION_SMASHED_BY_ROCK);
12499 #endif
12500       break;
12501
12502     case SAMPLE_wonderfall:
12503       PlayLevelSoundElementAction(x, y, element, ACTION_FILLING);
12504       break;
12505
12506     case SAMPLE_drip:
12507       PlayLevelSoundElementAction(x, y, element, ACTION_IMPACT);
12508       break;
12509
12510     case SAMPLE_push:
12511       PlayLevelSoundElementAction(x, y, element, ACTION_PUSHING);
12512       break;
12513
12514     case SAMPLE_dirt:
12515       PlayLevelSoundElementAction(x, y, element, ACTION_DIGGING);
12516       break;
12517
12518     case SAMPLE_acid:
12519       PlayLevelSoundElementAction(x, y, element, ACTION_SPLASHING);
12520       break;
12521
12522     case SAMPLE_ball:
12523       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
12524       break;
12525
12526     case SAMPLE_grow:
12527       PlayLevelSoundElementAction(x, y, element, ACTION_GROWING);
12528       break;
12529
12530     case SAMPLE_wonder:
12531       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
12532       break;
12533
12534     case SAMPLE_door:
12535       PlayLevelSoundElementAction(x, y, element, ACTION_PASSING);
12536       break;
12537
12538     case SAMPLE_exit_open:
12539       PlayLevelSoundElementAction(x, y, element, ACTION_OPENING);
12540       break;
12541
12542     case SAMPLE_exit_leave:
12543       PlayLevelSoundElementAction(x, y, element, ACTION_PASSING);
12544       break;
12545
12546     case SAMPLE_dynamite:
12547       PlayLevelSoundElementAction(x, y, element, ACTION_DROPPING);
12548       break;
12549
12550     case SAMPLE_tick:
12551       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
12552       break;
12553
12554     case SAMPLE_press:
12555       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVATING);
12556       break;
12557
12558     case SAMPLE_wheel:
12559       PlayLevelSoundElementAction(x, y, element, ACTION_ACTIVE);
12560       break;
12561
12562     case SAMPLE_boom:
12563       PlayLevelSoundElementAction(x, y, element, ACTION_EXPLODING);
12564       break;
12565
12566     case SAMPLE_die:
12567       PlayLevelSoundElementAction(x, y, element, ACTION_DYING);
12568       break;
12569
12570     case SAMPLE_time:
12571       PlaySoundStereo(SND_GAME_RUNNING_OUT_OF_TIME, SOUND_MIDDLE);
12572       break;
12573
12574     default:
12575       PlayLevelSoundElementAction(x, y, element, ACTION_DEFAULT);
12576       break;
12577   }
12578 }
12579
12580 void RaiseScore(int value)
12581 {
12582   local_player->score += value;
12583
12584   DrawGameValue_Score(local_player->score);
12585 }
12586
12587 void RaiseScoreElement(int element)
12588 {
12589   switch(element)
12590   {
12591     case EL_EMERALD:
12592     case EL_BD_DIAMOND:
12593     case EL_EMERALD_YELLOW:
12594     case EL_EMERALD_RED:
12595     case EL_EMERALD_PURPLE:
12596     case EL_SP_INFOTRON:
12597       RaiseScore(level.score[SC_EMERALD]);
12598       break;
12599     case EL_DIAMOND:
12600       RaiseScore(level.score[SC_DIAMOND]);
12601       break;
12602     case EL_CRYSTAL:
12603       RaiseScore(level.score[SC_CRYSTAL]);
12604       break;
12605     case EL_PEARL:
12606       RaiseScore(level.score[SC_PEARL]);
12607       break;
12608     case EL_BUG:
12609     case EL_BD_BUTTERFLY:
12610     case EL_SP_ELECTRON:
12611       RaiseScore(level.score[SC_BUG]);
12612       break;
12613     case EL_SPACESHIP:
12614     case EL_BD_FIREFLY:
12615     case EL_SP_SNIKSNAK:
12616       RaiseScore(level.score[SC_SPACESHIP]);
12617       break;
12618     case EL_YAMYAM:
12619     case EL_DARK_YAMYAM:
12620       RaiseScore(level.score[SC_YAMYAM]);
12621       break;
12622     case EL_ROBOT:
12623       RaiseScore(level.score[SC_ROBOT]);
12624       break;
12625     case EL_PACMAN:
12626       RaiseScore(level.score[SC_PACMAN]);
12627       break;
12628     case EL_NUT:
12629       RaiseScore(level.score[SC_NUT]);
12630       break;
12631     case EL_DYNAMITE:
12632     case EL_EM_DYNAMITE:
12633     case EL_SP_DISK_RED:
12634     case EL_DYNABOMB_INCREASE_NUMBER:
12635     case EL_DYNABOMB_INCREASE_SIZE:
12636     case EL_DYNABOMB_INCREASE_POWER:
12637       RaiseScore(level.score[SC_DYNAMITE]);
12638       break;
12639     case EL_SHIELD_NORMAL:
12640     case EL_SHIELD_DEADLY:
12641       RaiseScore(level.score[SC_SHIELD]);
12642       break;
12643     case EL_EXTRA_TIME:
12644       RaiseScore(level.extra_time_score);
12645       break;
12646     case EL_KEY_1:
12647     case EL_KEY_2:
12648     case EL_KEY_3:
12649     case EL_KEY_4:
12650     case EL_EM_KEY_1:
12651     case EL_EM_KEY_2:
12652     case EL_EM_KEY_3:
12653     case EL_EM_KEY_4:
12654     case EL_EMC_KEY_5:
12655     case EL_EMC_KEY_6:
12656     case EL_EMC_KEY_7:
12657     case EL_EMC_KEY_8:
12658       RaiseScore(level.score[SC_KEY]);
12659       break;
12660     default:
12661       RaiseScore(element_info[element].collect_score);
12662       break;
12663   }
12664 }
12665
12666 void RequestQuitGame(boolean ask_if_really_quit)
12667 {
12668   if (AllPlayersGone ||
12669       !ask_if_really_quit ||
12670       level_editor_test_game ||
12671       Request("Do you really want to quit the game ?",
12672               REQ_ASK | REQ_STAY_CLOSED))
12673   {
12674 #if defined(NETWORK_AVALIABLE)
12675     if (options.network)
12676       SendToServer_StopPlaying();
12677     else
12678 #endif
12679     {
12680       game_status = GAME_MODE_MAIN;
12681       DrawMainMenu();
12682     }
12683   }
12684   else
12685   {
12686     if (tape.playing && tape.deactivate_display)
12687       TapeDeactivateDisplayOff(TRUE);
12688
12689     OpenDoor(DOOR_OPEN_1 | DOOR_COPY_BACK);
12690
12691     if (tape.playing && tape.deactivate_display)
12692       TapeDeactivateDisplayOn();
12693   }
12694 }
12695
12696
12697 /* ---------- new game button stuff ---------------------------------------- */
12698
12699 /* graphic position values for game buttons */
12700 #define GAME_BUTTON_XSIZE       30
12701 #define GAME_BUTTON_YSIZE       30
12702 #define GAME_BUTTON_XPOS        5
12703 #define GAME_BUTTON_YPOS        215
12704 #define SOUND_BUTTON_XPOS       5
12705 #define SOUND_BUTTON_YPOS       (GAME_BUTTON_YPOS + GAME_BUTTON_YSIZE)
12706
12707 #define GAME_BUTTON_STOP_XPOS   (GAME_BUTTON_XPOS + 0 * GAME_BUTTON_XSIZE)
12708 #define GAME_BUTTON_PAUSE_XPOS  (GAME_BUTTON_XPOS + 1 * GAME_BUTTON_XSIZE)
12709 #define GAME_BUTTON_PLAY_XPOS   (GAME_BUTTON_XPOS + 2 * GAME_BUTTON_XSIZE)
12710 #define SOUND_BUTTON_MUSIC_XPOS (SOUND_BUTTON_XPOS + 0 * GAME_BUTTON_XSIZE)
12711 #define SOUND_BUTTON_LOOPS_XPOS (SOUND_BUTTON_XPOS + 1 * GAME_BUTTON_XSIZE)
12712 #define SOUND_BUTTON_SIMPLE_XPOS (SOUND_BUTTON_XPOS + 2 * GAME_BUTTON_XSIZE)
12713
12714 static struct
12715 {
12716   int x, y;
12717   int gadget_id;
12718   char *infotext;
12719 } gamebutton_info[NUM_GAME_BUTTONS] =
12720 {
12721   {
12722     GAME_BUTTON_STOP_XPOS,      GAME_BUTTON_YPOS,
12723     GAME_CTRL_ID_STOP,
12724     "stop game"
12725   },
12726   {
12727     GAME_BUTTON_PAUSE_XPOS,     GAME_BUTTON_YPOS,
12728     GAME_CTRL_ID_PAUSE,
12729     "pause game"
12730   },
12731   {
12732     GAME_BUTTON_PLAY_XPOS,      GAME_BUTTON_YPOS,
12733     GAME_CTRL_ID_PLAY,
12734     "play game"
12735   },
12736   {
12737     SOUND_BUTTON_MUSIC_XPOS,    SOUND_BUTTON_YPOS,
12738     SOUND_CTRL_ID_MUSIC,
12739     "background music on/off"
12740   },
12741   {
12742     SOUND_BUTTON_LOOPS_XPOS,    SOUND_BUTTON_YPOS,
12743     SOUND_CTRL_ID_LOOPS,
12744     "sound loops on/off"
12745   },
12746   {
12747     SOUND_BUTTON_SIMPLE_XPOS,   SOUND_BUTTON_YPOS,
12748     SOUND_CTRL_ID_SIMPLE,
12749     "normal sounds on/off"
12750   }
12751 };
12752
12753 void CreateGameButtons()
12754 {
12755   int i;
12756
12757   for (i = 0; i < NUM_GAME_BUTTONS; i++)
12758   {
12759     Bitmap *gd_bitmap = graphic_info[IMG_GLOBAL_DOOR].bitmap;
12760     struct GadgetInfo *gi;
12761     int button_type;
12762     boolean checked;
12763     unsigned long event_mask;
12764     int gd_xoffset, gd_yoffset;
12765     int gd_x1, gd_x2, gd_y1, gd_y2;
12766     int id = i;
12767
12768     gd_xoffset = gamebutton_info[i].x;
12769     gd_yoffset = gamebutton_info[i].y;
12770     gd_x1 = DOOR_GFX_PAGEX4 + gd_xoffset;
12771     gd_x2 = DOOR_GFX_PAGEX3 + gd_xoffset;
12772
12773     if (id == GAME_CTRL_ID_STOP ||
12774         id == GAME_CTRL_ID_PAUSE ||
12775         id == GAME_CTRL_ID_PLAY)
12776     {
12777       button_type = GD_TYPE_NORMAL_BUTTON;
12778       checked = FALSE;
12779       event_mask = GD_EVENT_RELEASED;
12780       gd_y1  = DOOR_GFX_PAGEY1 + gd_yoffset - GAME_BUTTON_YSIZE;
12781       gd_y2  = DOOR_GFX_PAGEY1 + gd_yoffset - GAME_BUTTON_YSIZE;
12782     }
12783     else
12784     {
12785       button_type = GD_TYPE_CHECK_BUTTON;
12786       checked =
12787         ((id == SOUND_CTRL_ID_MUSIC && setup.sound_music) ||
12788          (id == SOUND_CTRL_ID_LOOPS && setup.sound_loops) ||
12789          (id == SOUND_CTRL_ID_SIMPLE && setup.sound_simple) ? TRUE : FALSE);
12790       event_mask = GD_EVENT_PRESSED;
12791       gd_y1  = DOOR_GFX_PAGEY1 + gd_yoffset;
12792       gd_y2  = DOOR_GFX_PAGEY1 + gd_yoffset - GAME_BUTTON_YSIZE;
12793     }
12794
12795     gi = CreateGadget(GDI_CUSTOM_ID, id,
12796                       GDI_INFO_TEXT, gamebutton_info[i].infotext,
12797                       GDI_X, DX + gd_xoffset,
12798                       GDI_Y, DY + gd_yoffset,
12799                       GDI_WIDTH, GAME_BUTTON_XSIZE,
12800                       GDI_HEIGHT, GAME_BUTTON_YSIZE,
12801                       GDI_TYPE, button_type,
12802                       GDI_STATE, GD_BUTTON_UNPRESSED,
12803                       GDI_CHECKED, checked,
12804                       GDI_DESIGN_UNPRESSED, gd_bitmap, gd_x1, gd_y1,
12805                       GDI_DESIGN_PRESSED, gd_bitmap, gd_x2, gd_y1,
12806                       GDI_ALT_DESIGN_UNPRESSED, gd_bitmap, gd_x1, gd_y2,
12807                       GDI_ALT_DESIGN_PRESSED, gd_bitmap, gd_x2, gd_y2,
12808                       GDI_EVENT_MASK, event_mask,
12809                       GDI_CALLBACK_ACTION, HandleGameButtons,
12810                       GDI_END);
12811
12812     if (gi == NULL)
12813       Error(ERR_EXIT, "cannot create gadget");
12814
12815     game_gadget[id] = gi;
12816   }
12817 }
12818
12819 void FreeGameButtons()
12820 {
12821   int i;
12822
12823   for (i = 0; i < NUM_GAME_BUTTONS; i++)
12824     FreeGadget(game_gadget[i]);
12825 }
12826
12827 static void MapGameButtons()
12828 {
12829   int i;
12830
12831   for (i = 0; i < NUM_GAME_BUTTONS; i++)
12832     MapGadget(game_gadget[i]);
12833 }
12834
12835 void UnmapGameButtons()
12836 {
12837   int i;
12838
12839   for (i = 0; i < NUM_GAME_BUTTONS; i++)
12840     UnmapGadget(game_gadget[i]);
12841 }
12842
12843 static void HandleGameButtons(struct GadgetInfo *gi)
12844 {
12845   int id = gi->custom_id;
12846
12847   if (game_status != GAME_MODE_PLAYING)
12848     return;
12849
12850   switch (id)
12851   {
12852     case GAME_CTRL_ID_STOP:
12853       RequestQuitGame(TRUE);
12854       break;
12855
12856     case GAME_CTRL_ID_PAUSE:
12857       if (options.network)
12858       {
12859 #if defined(NETWORK_AVALIABLE)
12860         if (tape.pausing)
12861           SendToServer_ContinuePlaying();
12862         else
12863           SendToServer_PausePlaying();
12864 #endif
12865       }
12866       else
12867         TapeTogglePause(TAPE_TOGGLE_MANUAL);
12868       break;
12869
12870     case GAME_CTRL_ID_PLAY:
12871       if (tape.pausing)
12872       {
12873 #if defined(NETWORK_AVALIABLE)
12874         if (options.network)
12875           SendToServer_ContinuePlaying();
12876         else
12877 #endif
12878         {
12879           tape.pausing = FALSE;
12880           DrawVideoDisplay(VIDEO_STATE_PAUSE_OFF,0);
12881         }
12882       }
12883       break;
12884
12885     case SOUND_CTRL_ID_MUSIC:
12886       if (setup.sound_music)
12887       {
12888         setup.sound_music = FALSE;
12889         FadeMusic();
12890       }
12891       else if (audio.music_available)
12892       {
12893         setup.sound = setup.sound_music = TRUE;
12894
12895         SetAudioMode(setup.sound);
12896
12897         PlayLevelMusic();
12898       }
12899       break;
12900
12901     case SOUND_CTRL_ID_LOOPS:
12902       if (setup.sound_loops)
12903         setup.sound_loops = FALSE;
12904       else if (audio.loops_available)
12905       {
12906         setup.sound = setup.sound_loops = TRUE;
12907         SetAudioMode(setup.sound);
12908       }
12909       break;
12910
12911     case SOUND_CTRL_ID_SIMPLE:
12912       if (setup.sound_simple)
12913         setup.sound_simple = FALSE;
12914       else if (audio.sound_available)
12915       {
12916         setup.sound = setup.sound_simple = TRUE;
12917         SetAudioMode(setup.sound);
12918       }
12919       break;
12920
12921     default:
12922       break;
12923   }
12924 }