rnd-20030703-1-src
[rocksndiamonds.git] / src / game.c
index 745407c990f1585a45408baf08f94fa302b6bf47..1b6251b62491bf23a2f579e6764e536e0e7ec38e 100644 (file)
@@ -89,6 +89,9 @@
 #define DOUBLE_PLAYER_SPEED(p) (HALVE_MOVE_DELAY((p)->move_delay_value))
 #define HALVE_PLAYER_SPEED(p)  (DOUBLE_MOVE_DELAY((p)->move_delay_value))
 
+/* values for other actions */
+#define MOVE_STEPSIZE_NORMAL   (TILEX / MOVE_DELAY_NORMAL_SPEED)
+
 #define        INIT_GFX_RANDOM()       (SimpleRND(1000000))
 
 #define GET_NEW_PUSH_DELAY(e)  (   (element_info[e].push_delay_fixed) + \
@@ -163,9 +166,12 @@ static void CloseAllOpenTimegates(void);
 static void CheckGravityMovement(struct PlayerInfo *);
 static void KillHeroUnlessProtected(int, int);
 
-static void CheckTriggeredElementChange(int, int);
-static void CheckPlayerElementChange(int, int, int, int);
-static void ChangeElementDoIt(int, int, int);
+static void TestIfPlayerTouchesCustomElement(int, int);
+static void TestIfElementTouchesCustomElement(int, int);
+
+static boolean CheckTriggeredElementChange(int, int);
+static boolean CheckElementChange(int, int, int, int);
+static void ChangeElementNow(int, int, int);
 
 static void PlaySoundLevel(int, int, int);
 static void PlaySoundLevelNearest(int, int, int);
@@ -202,8 +208,8 @@ static void RunTimegateWheel(int x, int y);
 
 struct ChangingElementInfo
 {
-  int base_element;
-  int next_element;
+  int element;
+  int target_element;
   int change_delay;
   void (*pre_change_function)(int x, int y);
   void (*change_function)(int x, int y);
@@ -370,6 +376,25 @@ push_delay_list[] =
   { EL_UNDEFINED,              0, 0 },
 };
 
+struct
+{
+  int element;
+  int move_stepsize;
+}
+move_stepsize_list[] =
+{
+  { EL_AMOEBA_DROP,            2 },
+  { EL_AMOEBA_DROPPING,                2 },
+  { EL_QUICKSAND_FILLING,      1 },
+  { EL_QUICKSAND_EMPTYING,     1 },
+  { EL_MAGIC_WALL_FILLING,     2 },
+  { EL_BD_MAGIC_WALL_FILLING,  2 },
+  { EL_MAGIC_WALL_EMPTYING,    2 },
+  { EL_BD_MAGIC_WALL_EMPTYING, 2 },
+
+  { EL_UNDEFINED,              0 },
+};
+
 struct
 {
   int element;
@@ -377,28 +402,26 @@ struct
 }
 gem_count_list[] =
 {
-  { EL_EMERALD,                1 },
-  { EL_BD_DIAMOND,     1 },
-  { EL_EMERALD_YELLOW, 1 },
-  { EL_EMERALD_RED,    1 },
-  { EL_EMERALD_PURPLE, 1 },
-  { EL_DIAMOND,                3 },
-  { EL_SP_INFOTRON,    1 },
-  { EL_PEARL,          5 },
-  { EL_CRYSTAL,                8 },
-
-  { EL_UNDEFINED,      0 },
+  { EL_EMERALD,                        1 },
+  { EL_BD_DIAMOND,             1 },
+  { EL_EMERALD_YELLOW,         1 },
+  { EL_EMERALD_RED,            1 },
+  { EL_EMERALD_PURPLE,         1 },
+  { EL_DIAMOND,                        3 },
+  { EL_SP_INFOTRON,            1 },
+  { EL_PEARL,                  5 },
+  { EL_CRYSTAL,                        8 },
+
+  { EL_UNDEFINED,              0 },
 };
 
-static struct ChangingElementInfo changing_element[MAX_NUM_ELEMENTS];
+static boolean changing_element[MAX_NUM_ELEMENTS];
 static unsigned long trigger_events[MAX_NUM_ELEMENTS];
-static int gem_count[MAX_NUM_ELEMENTS];
 
-#define IS_AUTO_CHANGING(e)  (changing_element[e].base_element != EL_UNDEFINED)
+#define IS_AUTO_CHANGING(e)    (changing_element[e])
 #define IS_JUST_CHANGING(x, y) (ChangeDelay[x][y] != 0)
 #define IS_CHANGING(x, y)      (IS_AUTO_CHANGING(Feld[x][y]) || \
                                 IS_JUST_CHANGING(x, y))
-#define TRIGGERS_BY_COLLECTING(e) (trigger_events[e] & CE_OTHER_COLLECTING)
 
 
 void GetPlayerConfig()
@@ -743,42 +766,75 @@ static void InitGameEngine()
   /* initialize changing elements information */
   for (i=0; i<MAX_NUM_ELEMENTS; i++)
   {
+#if 1
+    element_info[i].change.pre_change_function = NULL;
+    element_info[i].change.change_function = NULL;
+    element_info[i].change.post_change_function = NULL;
+
+    if (!IS_CUSTOM_ELEMENT(i))
+    {
+      element_info[i].change.target_element = EL_EMPTY_SPACE;
+      element_info[i].change.delay_fixed = 0;
+      element_info[i].change.delay_random = 0;
+      element_info[i].change.delay_frames = 1;
+    }
+
+    changing_element[i] = FALSE;
+#else
     changing_element[i].base_element = EL_UNDEFINED;
     changing_element[i].next_element = EL_UNDEFINED;
     changing_element[i].change_delay = -1;
     changing_element[i].pre_change_function = NULL;
     changing_element[i].change_function = NULL;
     changing_element[i].post_change_function = NULL;
+#endif
   }
 
   /* add changing elements from pre-defined list */
-  for (i=0; changing_element_list[i].base_element != EL_UNDEFINED; i++)
+  for (i=0; changing_element_list[i].element != EL_UNDEFINED; i++)
   {
+    int element = changing_element_list[i].element;
     struct ChangingElementInfo *ce = &changing_element_list[i];
-    int element = ce->base_element;
+    struct ElementChangeInfo *change = &element_info[element].change;
+
+#if 1
+    change->target_element       = ce->target_element;
+    change->delay_fixed          = ce->change_delay;
+    change->pre_change_function  = ce->pre_change_function;
+    change->change_function      = ce->change_function;
+    change->post_change_function = ce->post_change_function;
 
+    changing_element[element] = TRUE;
+#else
     changing_element[element].base_element         = ce->base_element;
     changing_element[element].next_element         = ce->next_element;
     changing_element[element].change_delay         = ce->change_delay;
     changing_element[element].pre_change_function  = ce->pre_change_function;
     changing_element[element].change_function      = ce->change_function;
     changing_element[element].post_change_function = ce->post_change_function;
+#endif
   }
 
   /* add changing elements from custom element configuration */
   for (i=0; i < NUM_CUSTOM_ELEMENTS; i++)
   {
     int element = EL_CUSTOM_START + i;
+#if 0
     struct ElementChangeInfo *change = &element_info[element].change;
+#endif
 
     /* only add custom elements that change after fixed/random frame delay */
     if (!CAN_CHANGE(element) || !HAS_CHANGE_EVENT(element, CE_DELAY))
       continue;
 
+#if 1
+    changing_element[element] = TRUE;
+#else
     changing_element[element].base_element = element;
-    changing_element[element].next_element = change->successor;
+    changing_element[element].next_element = change->target_element;
     changing_element[element].change_delay = (change->delay_fixed *
                                              change->delay_frames);
+#endif
   }
 
   /* ---------- initialize trigger events ---------------------------------- */
@@ -790,7 +846,7 @@ static void InitGameEngine()
   /* add trigger events from element change event properties */
   for (i=0; i<MAX_NUM_ELEMENTS; i++)
     if (HAS_CHANGE_EVENT(i, CE_BY_OTHER))
-      trigger_events[element_info[i].change.trigger] |=
+      trigger_events[element_info[i].change.trigger_element] |=
        element_info[i].change.events;
 
   /* ---------- initialize push delay -------------------------------------- */
@@ -814,15 +870,32 @@ static void InitGameEngine()
     element_info[e].push_delay_random = push_delay_list[i].push_delay_random;
   }
 
+  /* ---------- initialize move stepsize ----------------------------------- */
+
+  /* initialize move stepsize values to default */
+  for (i=0; i<MAX_NUM_ELEMENTS; i++)
+    if (!IS_CUSTOM_ELEMENT(i))
+      element_info[i].move_stepsize = MOVE_STEPSIZE_NORMAL;
+
+  /* set move stepsize value for certain elements from pre-defined list */
+  for (i=0; move_stepsize_list[i].element != EL_UNDEFINED; i++)
+  {
+    int e = move_stepsize_list[i].element;
+
+    element_info[e].move_stepsize = move_stepsize_list[i].move_stepsize;
+  }
+
   /* ---------- initialize gem count --------------------------------------- */
 
   /* initialize gem count values for each element */
   for (i=0; i<MAX_NUM_ELEMENTS; i++)
-    gem_count[i] = 0;
+    if (!IS_CUSTOM_ELEMENT(i))
+      element_info[i].gem_count = 0;
 
   /* add gem count values for all elements from pre-defined list */
   for (i=0; gem_count_list[i].element != EL_UNDEFINED; i++)
-    gem_count[gem_count_list[i].element] = gem_count_list[i].gem_count;
+    element_info[gem_count_list[i].element].gem_count =
+      gem_count_list[i].gem_count;
 }
 
 
@@ -1672,19 +1745,26 @@ static int MovingOrBlocked2ElementIfNotLeaving(int x, int y)
 static void RemoveField(int x, int y)
 {
   Feld[x][y] = EL_EMPTY;
-  GfxElement[x][y] = EL_UNDEFINED;
+
   MovPos[x][y] = 0;
   MovDir[x][y] = 0;
   MovDelay[x][y] = 0;
+
+  AmoebaNr[x][y] = 0;
   ChangeDelay[x][y] = 0;
   Pushed[x][y] = FALSE;
+
+  GfxElement[x][y] = EL_UNDEFINED;
+  GfxAction[x][y] = ACTION_DEFAULT;
 }
 
 void RemoveMovingField(int x, int y)
 {
   int oldx = x, oldy = y, newx = x, newy = y;
+  int element = Feld[x][y];
+  int next_element = EL_UNDEFINED;
 
-  if (Feld[x][y] != EL_BLOCKED && !IS_MOVING(x, y))
+  if (element != EL_BLOCKED && !IS_MOVING(x, y))
     return;
 
   if (IS_MOVING(x, y))
@@ -1693,29 +1773,27 @@ void RemoveMovingField(int x, int y)
     if (Feld[newx][newy] != EL_BLOCKED)
       return;
   }
-  else if (Feld[x][y] == EL_BLOCKED)
+  else if (element == EL_BLOCKED)
   {
     Blocked2Moving(x, y, &oldx, &oldy);
     if (!IS_MOVING(oldx, oldy))
       return;
   }
 
-  if (Feld[x][y] == EL_BLOCKED &&
+  if (element == EL_BLOCKED &&
       (Feld[oldx][oldy] == EL_QUICKSAND_EMPTYING ||
        Feld[oldx][oldy] == EL_MAGIC_WALL_EMPTYING ||
        Feld[oldx][oldy] == EL_BD_MAGIC_WALL_EMPTYING ||
        Feld[oldx][oldy] == EL_AMOEBA_DROPPING))
-    Feld[oldx][oldy] = get_next_element(Feld[oldx][oldy]);
-  else
-    Feld[oldx][oldy] = EL_EMPTY;
+    next_element = get_next_element(Feld[oldx][oldy]);
+
+  RemoveField(oldx, oldy);
+  RemoveField(newx, newy);
 
   Store[oldx][oldy] = Store2[oldx][oldy] = 0;
 
-  Feld[newx][newy] = EL_EMPTY;
-  MovPos[oldx][oldy] = MovDir[oldx][oldy] = MovDelay[oldx][oldy] = 0;
-  MovPos[newx][newy] = MovDir[newx][newy] = MovDelay[newx][newy] = 0;
-  ChangeDelay[oldx][oldy] = ChangeDelay[newx][newy] = 0;
-  GfxAction[oldx][oldy] = GfxAction[newx][newy] = ACTION_DEFAULT;
+  if (next_element != EL_UNDEFINED)
+    Feld[oldx][oldy] = next_element;
 
   DrawLevelField(oldx, oldy);
   DrawLevelField(newx, newy);
@@ -1862,6 +1940,19 @@ void Explode(int ex, int ey, int phase, int mode)
       if (element == EL_EXPLOSION)
        element = Store2[x][y];
 
+#if 1
+      if (AmoebaNr[x][y] &&
+         (element == EL_AMOEBA_FULL ||
+          element == EL_BD_AMOEBA ||
+          element == EL_AMOEBA_GROWING))
+      {
+       AmoebaCnt[AmoebaNr[x][y]]--;
+       AmoebaCnt2[AmoebaNr[x][y]]--;
+      }
+
+      RemoveField(x, y);
+#endif
+
       if (IS_PLAYER(ex, ey) && !PLAYER_PROTECTED(ex, ey))
       {
        switch(StorePlayer[ex][ey])
@@ -1925,6 +2016,7 @@ void Explode(int ex, int ey, int phase, int mode)
          center_element == EL_AMOEBA_TO_DIAMOND || mode == EX_BORDER)
        Store2[x][y] = element;
 
+#if 0
       if (AmoebaNr[x][y] &&
          (element == EL_AMOEBA_FULL ||
           element == EL_BD_AMOEBA ||
@@ -1934,14 +2026,21 @@ void Explode(int ex, int ey, int phase, int mode)
        AmoebaCnt2[AmoebaNr[x][y]]--;
       }
 
+#if 1
+      RemoveField(x, y);
+#else
+      MovDir[x][y] = MovPos[x][y] = 0;
+      AmoebaNr[x][y] = 0;
+#endif
+#endif
+
       Feld[x][y] = EL_EXPLOSION;
 #if 1
       GfxElement[x][y] = center_element;
 #else
       GfxElement[x][y] = EL_UNDEFINED;
 #endif
-      MovDir[x][y] = MovPos[x][y] = 0;
-      AmoebaNr[x][y] = 0;
+
       ExplodePhase[x][y] = 1;
       Stop[x][y] = TRUE;
     }
@@ -2093,7 +2192,11 @@ void DynaExplode(int ex, int ey)
 
 void Bang(int x, int y)
 {
+#if 1
+  int element = MovingOrBlocked2Element(x, y);
+#else
   int element = Feld[x][y];
+#endif
 
   if (IS_PLAYER(x, y))
   {
@@ -2153,7 +2256,7 @@ void Bang(int x, int y)
       break;
   }
 
-  CheckTriggeredElementChange(element, CE_OTHER_EXPLODING);
+  CheckTriggeredElementChange(element, CE_OTHER_IS_EXPLODING);
 }
 
 void SplashAcid(int x, int y)
@@ -2529,15 +2632,24 @@ void Impact(int x, int y)
     PlaySoundLevel(x, y, SND_PEARL_BREAKING);
     return;
   }
+#if 1
+  else if (impact && CheckElementChange(x, y, element, ACTION_IMPACT))
+  {
+    PlaySoundLevelElementAction(x, y, element, ACTION_IMPACT);
+
+    return;
+  }
+#else
   else if (impact && CAN_CHANGE(element) &&
           HAS_CHANGE_EVENT(element, CE_IMPACT))
   {
     PlaySoundLevelElementAction(x, y, element, ACTION_IMPACT);
 
-    ChangeElementDoIt(x, y, element_info[element].change.successor);
+    ChangeElementNow(x, y, element);
 
     return;
   }
+#endif
 
   if (impact && element == EL_AMOEBA_DROP)
   {
@@ -2662,11 +2774,21 @@ void Impact(int x, int y)
        {
          ToggleLightSwitch(x, y + 1);
        }
-       else if (CAN_CHANGE(smashed) &&
-                HAS_CHANGE_EVENT(smashed, CE_SMASHED))
+#if 1
+       else
+       {
+         CheckElementChange(x, y + 1, smashed, CE_SMASHED);
+       }
+#else
+       else if (CAN_CHANGE(smashed) && HAS_CHANGE_EVENT(smashed, CE_SMASHED))
        {
-         ChangeElementDoIt(x, y + 1, element_info[smashed].change.successor);
+         ChangeElementNow(x, y + 1, smashed);
        }
+#endif
+      }
+      else
+      {
+       CheckElementChange(x, y + 1, smashed, CE_SMASHED);
       }
     }
   }
@@ -3883,23 +4005,22 @@ void ContinueMoving(int x, int y)
   int dy = (direction == MV_UP   ? -1 : direction == MV_DOWN  ? +1 : 0);
   int horiz_move = (dx != 0);
   int newx = x + dx, newy = y + dy;
-  int step = (horiz_move ? dx : dy) * TILEX / MOVE_DELAY_NORMAL_SPEED;
+  int nextx = newx + dx, nexty = newy + dy;
 #if 1
-  boolean pushed = Pushed[x][y];
+  int sign = (horiz_move ? dx : dy);
+  int step = sign * element_info[element].move_stepsize;
 #else
-  struct PlayerInfo *player = (IS_PLAYER(x, y) ? PLAYERINFO(x, y) : NULL);
-#if 0
-  boolean pushing = (player != NULL && player->Pushing && player->MovPos != 0);
-#else
-  boolean pushing = (player != NULL && player->Pushing && player->is_moving);
-#endif
-#endif
-
-#if 0
-  if (player && player->is_moving && player->MovPos == 0)
-    printf("::: !!!\n");
+  int step = (horiz_move ? dx : dy) * MOVE_STEPSIZE_NORMAL;
 #endif
+  boolean pushed = Pushed[x][y];
 
+#if 1
+  if (CAN_FALL(element) && horiz_move &&
+      y < lev_fieldy - 1 && IS_BELT_ACTIVE(Feld[x][y + 1]))
+    step = sign * MOVE_STEPSIZE_NORMAL / 2;
+  else if (element == EL_SPRING && horiz_move)
+    step = sign * MOVE_STEPSIZE_NORMAL * 2;
+#else
   if (element == EL_AMOEBA_DROP || element == EL_AMOEBA_DROPPING)
     step /= 2;
   else if (element == EL_QUICKSAND_FILLING ||
@@ -3921,33 +4042,13 @@ void ContinueMoving(int x, int y)
 #if OLD_GAME_BEHAVIOUR
   else if (CAN_FALL(element) && horiz_move && !IS_SP_ELEMENT(element))
     step*=2;
+#endif
 #endif
 
   MovPos[x][y] += step;
 
-#if 1
-#if 1
   if (pushed)          /* special case: moving object pushed by player */
-#else
-  if (pushing)         /* special case: moving object pushed by player */
-#endif
-#if 1
     MovPos[x][y] = SIGN(MovPos[x][y]) * (TILEX - ABS(PLAYERINFO(x,y)->MovPos));
-#else
-    MovPos[x][y] = SIGN(MovPos[x][y]) * (TILEX - ABS(PLAYERINFO(x,y)->GfxPos));
-#endif
-#endif
-
-#if 0
-  if (element == EL_SPRING)
-    printf("::: spring moves %d [%d: %d, %d, %d/%d]\n",
-          MovPos[x][y],
-          pushing,
-          (player?player->Pushing:-42),
-          (player?player->is_moving:-42),
-          (player?player->MovPos:-42),
-          (player?player->GfxPos:-42));
-#endif
 
   if (ABS(MovPos[x][y]) >= TILEX)      /* object reached its destination */
   {
@@ -4055,7 +4156,6 @@ void ContinueMoving(int x, int y)
 
     ResetGfxAnimation(x, y);   /* reset animation values for old field */
 
-#if 1
 #if 0
     /* 2.1.1 (does not work correctly for spring) */
     if (!CAN_MOVE(element))
@@ -4077,20 +4177,14 @@ void ContinueMoving(int x, int y)
        (CAN_FALL(element) && MovDir[newx][newy] == MV_DOWN))
       MovDir[newx][newy] = 0;
 #endif
-
-#endif
 #endif
 
     DrawLevelField(x, y);
     DrawLevelField(newx, newy);
 
-#if 0
-    if (game.engine_version >= RELEASE_IDENT(2,2,0,7) || !pushing)
-#endif
-      Stop[newx][newy] = TRUE; /* ignore this element until the next frame */
-#if 1
+    Stop[newx][newy] = TRUE;   /* ignore this element until the next frame */
+
     if (!pushed)       /* special case: moving object pushed by player */
-#endif
       JustStopped[newx][newy] = 3;
 
     if (DONT_TOUCH(element))   /* object may be nasty to player or others */
@@ -4102,15 +4196,15 @@ void ContinueMoving(int x, int y)
     else if (element == EL_PENGUIN)
       TestIfFriendTouchesBadThing(newx, newy);
 
-#if 1
     if (CAN_FALL(element) && direction == MV_DOWN &&
        (newy == lev_fieldy - 1 || !IS_FREE(x, newy + 1)))
       Impact(x, newy);
-#else
-    if (CAN_SMASH(element) && direction == MV_DOWN &&
-       (newy == lev_fieldy - 1 || !IS_FREE(x, newy + 1)))
-      Impact(x, newy);
-#endif
+
+    if (!IN_LEV_FIELD(nextx, nexty) || !IS_FREE(nextx, nexty))
+      CheckElementChange(newx, newy, element, CE_COLLISION);
+
+    TestIfPlayerTouchesCustomElement(newx, newy);
+    TestIfElementTouchesCustomElement(newx, newy);
   }
   else                         /* still moving on */
   {
@@ -5002,12 +5096,16 @@ static void ChangeActiveTrap(int x, int y)
     DrawLevelFieldCrumbledSand(x, y);
 }
 
-static void ChangeElementDoIt(int x, int y, int element_new)
+static void ChangeElementNowExt(int x, int y, int target_element)
 {
-  CheckTriggeredElementChange(Feld[x][y], CE_OTHER_CHANGING);
+  if (IS_PLAYER(x, y) && !IS_ACCESSIBLE(target_element))
+  {
+    Bang(x, y);
+    return;
+  }
 
   RemoveField(x, y);
-  Feld[x][y] = element_new;
+  Feld[x][y] = target_element;
 
   ResetGfxAnimation(x, y);
   ResetRandomAnimationValue(x, y);
@@ -5048,12 +5146,108 @@ static void ChangeElementDoIt(int x, int y, int element_new)
   }
 }
 
+static void ChangeElementNow(int x, int y, int element)
+{
+  struct ElementChangeInfo *change = &element_info[element].change;
+
+  CheckTriggeredElementChange(Feld[x][y], CE_OTHER_IS_CHANGING);
+
+  if (change->explode)
+  {
+    Bang(x, y);
+    return;
+  }
+
+  if (change->use_content)
+  {
+    boolean complete_change = TRUE;
+    boolean can_change[3][3];
+    int xx, yy;
+
+    for (yy = 0; yy < 3; yy++) for(xx = 0; xx < 3 ; xx++)
+    {
+      boolean half_destructible;
+      int ex = x + xx - 1;
+      int ey = y + yy - 1;
+      int e;
+
+      can_change[xx][yy] = TRUE;
+
+      if (ex == x && ey == y)  /* do not check changing element itself */
+       continue;
+
+      if (change->content[xx][yy] == EL_EMPTY_SPACE)
+      {
+       can_change[xx][yy] = FALSE;     /* do not change empty borders */
+
+       continue;
+      }
+
+      if (!IN_LEV_FIELD(ex, ey))
+      {
+       can_change[xx][yy] = FALSE;
+       complete_change = FALSE;
+
+       continue;
+      }
+
+      e = Feld[ex][ey];
+
+      half_destructible = (IS_FREE(ex, ey) || IS_DIGGABLE(e));
+
+      if ((change->power <= CP_NON_DESTRUCTIVE  && !IS_FREE(ex, ey)) ||
+         (change->power <= CP_HALF_DESTRUCTIVE && !half_destructible) ||
+         (change->power <= CP_FULL_DESTRUCTIVE && IS_INDESTRUCTIBLE(e)))
+      {
+       can_change[xx][yy] = FALSE;
+       complete_change = FALSE;
+      }
+    }
+
+    if (!change->only_complete || complete_change)
+    {
+      if (change->only_complete && change->use_random_change &&
+         RND(change->random) != 0)
+       return;
+
+      for (yy = 0; yy < 3; yy++) for(xx = 0; xx < 3 ; xx++)
+      {
+       int ex = x + xx - 1;
+       int ey = y + yy - 1;
+
+       if (can_change[xx][yy] && (!change->use_random_change ||
+                                  RND(change->random) == 0))
+       {
+         ChangeElementNowExt(ex, ey, change->content[xx][yy]);
+
+         /* for symmetry reasons, stop newly created border elements */
+         if (ex != x || ey != y)
+           Stop[ex][ey] = TRUE;
+       }
+      }
+
+      return;
+    }
+  }
+
+  ChangeElementNowExt(x, y, change->target_element);
+}
+
 static void ChangeElement(int x, int y)
 {
+#if 1
+  int element = MovingOrBlocked2Element(x, y);
+#else
   int element = Feld[x][y];
+#endif
+  struct ElementChangeInfo *change = &element_info[element].change;
 
   if (ChangeDelay[x][y] == 0)          /* initialize element change */
   {
+#if 1
+    ChangeDelay[x][y] = (    change->delay_fixed  * change->delay_frames +
+                        RND(change->delay_random * change->delay_frames)) + 1;
+#else
     ChangeDelay[x][y] = changing_element[element].change_delay + 1;
 
     if (IS_CUSTOM_ELEMENT(element) && HAS_CHANGE_EVENT(element, CE_DELAY))
@@ -5063,12 +5257,18 @@ static void ChangeElement(int x, int y)
 
       ChangeDelay[x][y] += RND(max_random_delay * delay_frames);
     }
+#endif
 
     ResetGfxAnimation(x, y);
     ResetRandomAnimationValue(x, y);
 
+#if 1
+    if (change->pre_change_function)
+      change->pre_change_function(x, y);
+#else
     if (changing_element[element].pre_change_function)
       changing_element[element].pre_change_function(x, y);
+#endif
   }
 
   ChangeDelay[x][y]--;
@@ -5080,12 +5280,19 @@ static void ChangeElement(int x, int y)
     if (IS_ANIMATED(graphic))
       DrawLevelGraphicAnimationIfNeeded(x, y, graphic);
 
+#if 1
+    if (change->change_function)
+      change->change_function(x, y);
+#else
     if (changing_element[element].change_function)
       changing_element[element].change_function(x, y);
+#endif
   }
   else                                 /* finish element change */
   {
+#if 0
     int next_element = changing_element[element].next_element;
+#endif
 
     if (IS_MOVING(x, y))               /* never change a running system ;-) */
     {
@@ -5094,27 +5301,35 @@ static void ChangeElement(int x, int y)
       return;
     }
 
+#if 1
+    ChangeElementNow(x, y, element);
+
+    if (change->post_change_function)
+      change->post_change_function(x, y);
+#else
     if (next_element != EL_UNDEFINED)
-      ChangeElementDoIt(x, y, next_element);
+      ChangeElementNow(x, y, next_element);
     else
-      ChangeElementDoIt(x, y, element_info[element].change.successor);
+      ChangeElementNow(x, y, element_info[element].change.target_element);
 
     if (changing_element[element].post_change_function)
       changing_element[element].post_change_function(x, y);
+#endif
   }
 }
 
-static void CheckTriggeredElementChange(int trigger_element, int trigger_event)
+static boolean CheckTriggeredElementChange(int trigger_element,
+                                          int trigger_event)
 {
   int i, x, y;
 
   if (!(trigger_events[trigger_element] & CH_EVENT_BIT(trigger_event)))
-    return;
+    return FALSE;
 
   for (i=0; i<MAX_NUM_ELEMENTS; i++)
   {
     if (!CAN_CHANGE(i) || !HAS_CHANGE_EVENT(i, trigger_event) ||
-       element_info[i].change.trigger != trigger_element)
+       element_info[i].change.trigger_element != trigger_element)
       continue;
 
     for (y=0; y<lev_fieldy; y++) for (x=0; x<lev_fieldx; x++)
@@ -5126,20 +5341,22 @@ static void CheckTriggeredElementChange(int trigger_element, int trigger_event)
       }
     }
   }
+
+  return TRUE;
 }
 
-static void CheckPlayerElementChange(int x, int y, int element,
-                                    int trigger_event)
+static boolean CheckElementChange(int x, int y, int element, int trigger_event)
 {
   if (!CAN_CHANGE(element) || !HAS_CHANGE_EVENT(element, trigger_event))
-    return;
+    return FALSE;
+
+  if (Feld[x][y] == EL_BLOCKED)
+    Blocked2Moving(x, y, &x, &y);
 
-#if 1
   ChangeDelay[x][y] = 1;
   ChangeElement(x, y);
-#else
-  ChangeElementDoIt(x, y, element_info[element].change.successor);
-#endif
+
+  return TRUE;
 }
 
 static void PlayerActions(struct PlayerInfo *player, byte player_action)
@@ -6070,6 +6287,7 @@ boolean MoveFigure(struct PlayerInfo *player, int dx, int dy)
   }
 
   TestIfHeroTouchesBadThing(jx, jy);
+  TestIfPlayerTouchesCustomElement(jx, jy);
 
   if (!player->active)
     RemoveHero(player);
@@ -6170,62 +6388,131 @@ void ScrollScreen(struct PlayerInfo *player, int mode)
     ScreenMovDir = MV_NO_MOVING;
 }
 
-void TestIfGoodThingHitsBadThing(int good_x, int good_y, int good_move_dir)
+void TestIfPlayerTouchesCustomElement(int x, int y)
 {
-  int i, kill_x = -1, kill_y = -1;
-  static int test_xy[4][2] =
+  static int xy[4][2] =
   {
     { 0, -1 },
     { -1, 0 },
     { +1, 0 },
     { 0, +1 }
   };
-  static int test_dir[4] =
-  {
-    MV_UP,
-    MV_LEFT,
-    MV_RIGHT,
-    MV_DOWN
-  };
+  boolean center_is_player = (IS_PLAYER(x, y));
+  int i;
 
   for (i=0; i<4; i++)
   {
-    int test_x, test_y, test_move_dir, test_element;
+    int xx = x + xy[i][0];
+    int yy = y + xy[i][1];
 
-    test_x = good_x + test_xy[i][0];
-    test_y = good_y + test_xy[i][1];
-    if (!IN_LEV_FIELD(test_x, test_y))
+    if (!IN_LEV_FIELD(xx, yy))
       continue;
 
-    test_move_dir =
-      (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NO_MOVING);
-
-#if 0
-    test_element = Feld[test_x][test_y];
-#else
-    test_element = MovingOrBlocked2ElementIfNotLeaving(test_x, test_y);
-#endif
-
-    /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
-       2nd case: DONT_TOUCH style bad thing does not move away from good thing
-    */
-    if ((DONT_RUN_INTO(test_element) && good_move_dir == test_dir[i]) ||
-       (DONT_TOUCH(test_element)    && test_move_dir != test_dir[i]))
+    if (center_is_player)
     {
-      kill_x = test_x;
-      kill_y = test_y;
+      CheckTriggeredElementChange(Feld[xx][yy], CE_OTHER_GETS_TOUCHED);
+      CheckElementChange(xx, yy, Feld[xx][yy], CE_TOUCHED_BY_PLAYER);
+    }
+    else if (IS_PLAYER(xx, yy))
+    {
+      CheckTriggeredElementChange(Feld[x][y], CE_OTHER_GETS_TOUCHED);
+      CheckElementChange(x, y, Feld[x][y], CE_TOUCHED_BY_PLAYER);
+
       break;
     }
   }
+}
 
-  if (kill_x != -1 || kill_y != -1)
+void TestIfElementTouchesCustomElement(int x, int y)
+{
+  static int xy[4][2] =
   {
-    if (IS_PLAYER(good_x, good_y))
-    {
-      struct PlayerInfo *player = PLAYERINFO(good_x, good_y);
-
-      if (player->shield_deadly_time_left > 0)
-       Bang(kill_x, kill_y);
+    { 0, -1 },
+    { -1, 0 },
+    { +1, 0 },
+    { 0, +1 }
+  };
+  boolean center_is_custom = (IS_CUSTOM_ELEMENT(Feld[x][y]));
+  int i;
+
+  for (i=0; i<4; i++)
+  {
+    int xx = x + xy[i][0];
+    int yy = y + xy[i][1];
+
+    if (!IN_LEV_FIELD(xx, yy))
+      continue;
+
+    if (center_is_custom &&
+       Feld[xx][yy] == element_info[Feld[x][y]].change.trigger_element)
+    {
+      CheckElementChange(x, y, Feld[x][y], CE_OTHER_IS_TOUCHING);
+    }
+
+    if (IS_CUSTOM_ELEMENT(Feld[xx][yy]) &&
+       Feld[x][y] == element_info[Feld[xx][yy]].change.trigger_element)
+    {
+      CheckElementChange(xx, yy, Feld[xx][yy], CE_OTHER_IS_TOUCHING);
+    }
+  }
+}
+
+void TestIfGoodThingHitsBadThing(int good_x, int good_y, int good_move_dir)
+{
+  int i, kill_x = -1, kill_y = -1;
+  static int test_xy[4][2] =
+  {
+    { 0, -1 },
+    { -1, 0 },
+    { +1, 0 },
+    { 0, +1 }
+  };
+  static int test_dir[4] =
+  {
+    MV_UP,
+    MV_LEFT,
+    MV_RIGHT,
+    MV_DOWN
+  };
+
+  for (i=0; i<4; i++)
+  {
+    int test_x, test_y, test_move_dir, test_element;
+
+    test_x = good_x + test_xy[i][0];
+    test_y = good_y + test_xy[i][1];
+    if (!IN_LEV_FIELD(test_x, test_y))
+      continue;
+
+    test_move_dir =
+      (IS_MOVING(test_x, test_y) ? MovDir[test_x][test_y] : MV_NO_MOVING);
+
+#if 0
+    test_element = Feld[test_x][test_y];
+#else
+    test_element = MovingOrBlocked2ElementIfNotLeaving(test_x, test_y);
+#endif
+
+    /* 1st case: good thing is moving towards DONT_RUN_INTO style bad thing;
+       2nd case: DONT_TOUCH style bad thing does not move away from good thing
+    */
+    if ((DONT_RUN_INTO(test_element) && good_move_dir == test_dir[i]) ||
+       (DONT_TOUCH(test_element)    && test_move_dir != test_dir[i]))
+    {
+      kill_x = test_x;
+      kill_y = test_y;
+      break;
+    }
+  }
+
+  if (kill_x != -1 || kill_y != -1)
+  {
+    if (IS_PLAYER(good_x, good_y))
+    {
+      struct PlayerInfo *player = PLAYERINFO(good_x, good_y);
+
+      if (player->shield_deadly_time_left > 0)
+       Bang(kill_x, kill_y);
       else if (!PLAYER_PROTECTED(good_x, good_y))
        KillHero(player);
     }
@@ -6460,10 +6747,12 @@ void RemoveHero(struct PlayerInfo *player)
 }
 
 /*
+  =============================================================================
   checkDiagonalPushing()
   -----------------------------------------------------------------------------
   check if diagonal input device direction results in pushing of object
   (by checking if the alternative direction is walkable, diggable, ...)
+  =============================================================================
 */
 
 static boolean checkDiagonalPushing(struct PlayerInfo *player,
@@ -6486,10 +6775,12 @@ static boolean checkDiagonalPushing(struct PlayerInfo *player,
 }
 
 /*
+  =============================================================================
   DigField()
   -----------------------------------------------------------------------------
   x, y:                        field next to player (non-diagonal) to try to dig to
   real_dx, real_dy:    direction as read from input device (can be diagonal)
+  =============================================================================
 */
 
 int DigField(struct PlayerInfo *player,
@@ -6563,248 +6854,12 @@ int DigField(struct PlayerInfo *player,
 
   element = Feld[x][y];
 
-#if 1
   if (mode == DF_SNAP && !IS_SNAPPABLE(element) &&
       game.engine_version >= VERSION_IDENT(2,2,0))
     return MF_NO_ACTION;
-#endif
 
   switch (element)
   {
-#if 0
-    case EL_EMPTY:
-      PlaySoundLevelElementAction(x, y, player->element_nr, ACTION_MOVING);
-      break;
-#endif
-
-#if 0
-    case EL_SAND:
-    case EL_INVISIBLE_SAND:
-    case EL_INVISIBLE_SAND_ACTIVE:
-    case EL_TRAP:
-    case EL_SP_BASE:
-    case EL_SP_BUGGY_BASE:
-    case EL_SP_BUGGY_BASE_ACTIVATING:
-      RemoveField(x, y);
-
-      if (mode != DF_SNAP && element != EL_EMPTY)
-      {
-       GfxElement[x][y] = (CAN_BE_CRUMBLED(element) ? EL_SAND : element);
-       player->is_digging = TRUE;
-      }
-
-      PlaySoundLevelElementAction(x, y, element, ACTION_DIGGING);
-      break;
-#endif
-
-#if 0
-
-    case EL_EMERALD:
-    case EL_BD_DIAMOND:
-    case EL_EMERALD_YELLOW:
-    case EL_EMERALD_RED:
-    case EL_EMERALD_PURPLE:
-    case EL_DIAMOND:
-    case EL_SP_INFOTRON:
-    case EL_PEARL:
-    case EL_CRYSTAL:
-      RemoveField(x, y);
-
-      if (mode != DF_SNAP)
-      {
-       GfxElement[x][y] = element;
-       player->is_collecting = TRUE;
-      }
-
-      local_player->gems_still_needed -= (element == EL_DIAMOND ? 3 :
-                                         element == EL_PEARL ? 5 :
-                                         element == EL_CRYSTAL ? 8 : 1);
-      if (local_player->gems_still_needed < 0)
-       local_player->gems_still_needed = 0;
-      RaiseScoreElement(element);
-      DrawText(DX_EMERALDS, DY_EMERALDS,
-              int2str(local_player->gems_still_needed, 3), FONT_TEXT_2);
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-
-#endif
-
-#if 0
-
-    case EL_SPEED_PILL:
-      RemoveField(x, y);
-      player->move_delay_value = MOVE_DELAY_HIGH_SPEED;
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_SPEED_PILL_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-
-#endif
-
-
-#if 0
-    case EL_ENVELOPE:
-      Feld[x][y] = EL_EMPTY;
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_ENVELOPE_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-#endif
-
-#if 0
-
-    case EL_EXTRA_TIME:
-      RemoveField(x, y);
-      if (level.time > 0)
-      {
-       TimeLeft += 10;
-       DrawText(DX_TIME, DY_TIME, int2str(TimeLeft, 3), FONT_TEXT_2);
-      }
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundStereo(SND_EXTRA_TIME_COLLECTING, SOUND_MIDDLE);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-
-#endif
-
-#if 0
-    case EL_SHIELD_NORMAL:
-      RemoveField(x, y);
-      player->shield_normal_time_left += 10;
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_SHIELD_NORMAL_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-
-    case EL_SHIELD_DEADLY:
-      RemoveField(x, y);
-      player->shield_normal_time_left += 10;
-      player->shield_deadly_time_left += 10;
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_SHIELD_DEADLY_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-#endif
-
-#if 0
-    case EL_DYNAMITE:
-    case EL_SP_DISK_RED:
-      RemoveField(x, y);
-      player->dynamite++;
-      player->use_disk_red_graphic = (element == EL_SP_DISK_RED);
-      RaiseScoreElement(EL_DYNAMITE);
-      DrawText(DX_DYNAMITE, DY_DYNAMITE, int2str(local_player->dynamite, 3),
-              FONT_TEXT_2);
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-#endif
-
-#if 0
-    case EL_DYNABOMB_INCREASE_NUMBER:
-      RemoveField(x, y);
-      player->dynabomb_count++;
-      player->dynabombs_left++;
-      RaiseScoreElement(EL_DYNAMITE);
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_DYNABOMB_INCREASE_NUMBER_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-
-    case EL_DYNABOMB_INCREASE_SIZE:
-      RemoveField(x, y);
-      player->dynabomb_size++;
-      RaiseScoreElement(EL_DYNAMITE);
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_DYNABOMB_INCREASE_SIZE_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-
-    case EL_DYNABOMB_INCREASE_POWER:
-      RemoveField(x, y);
-      player->dynabomb_xl = TRUE;
-      RaiseScoreElement(EL_DYNAMITE);
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_DYNABOMB_INCREASE_POWER_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-#endif
-
-#if 0
-    case EL_KEY_1:
-    case EL_KEY_2:
-    case EL_KEY_3:
-    case EL_KEY_4:
-    {
-      int key_nr = element - EL_KEY_1;
-      int graphic = el2edimg(element);
-
-      RemoveField(x, y);
-      player->key[key_nr] = TRUE;
-      RaiseScoreElement(element);
-      DrawMiniGraphicExt(drawto, DX_KEYS + key_nr * MINI_TILEX, DY_KEYS,
-                        graphic);
-      DrawMiniGraphicExt(window, DX_KEYS + key_nr * MINI_TILEX, DY_KEYS,
-                        graphic);
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_CLASS_KEY_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-    }
-
-    case EL_EM_KEY_1:
-    case EL_EM_KEY_2:
-    case EL_EM_KEY_3:
-    case EL_EM_KEY_4:
-    {
-      int key_nr = element - EL_EM_KEY_1;
-      int graphic = el2edimg(EL_KEY_1 + key_nr);
-
-      RemoveField(x, y);
-      player->key[key_nr] = TRUE;
-      RaiseScoreElement(element);
-      DrawMiniGraphicExt(drawto, DX_KEYS + key_nr * MINI_TILEX, DY_KEYS,
-                        graphic);
-      DrawMiniGraphicExt(window, DX_KEYS + key_nr * MINI_TILEX, DY_KEYS,
-                        graphic);
-#if 1
-      PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
-#else
-      PlaySoundLevel(x, y, SND_CLASS_KEY_COLLECTING);
-#endif
-      CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
-      break;
-    }
-#endif
-
     case EL_ROBOT_WHEEL:
       Feld[x][y] = EL_ROBOT_WHEEL_ACTIVE;
       ZX = x;
@@ -6905,175 +6960,6 @@ int DigField(struct PlayerInfo *player,
       return MF_ACTION;
       break;
 
-#if 0
-
-      /* the following elements cannot be pushed by "snapping" */
-    case EL_ROCK:
-    case EL_BOMB:
-    case EL_DX_SUPABOMB:
-    case EL_NUT:
-    case EL_TIME_ORB_EMPTY:
-    case EL_SP_ZONK:
-    case EL_SP_DISK_ORANGE:
-    case EL_SPRING:
-      if (mode == DF_SNAP)
-       return MF_NO_ACTION;
-
-      /* no "break" -- fall through to next case */
-
-      /* the following elements can be pushed by "snapping" */
-    case EL_BD_ROCK:
-      if (dy)
-       return MF_NO_ACTION;
-
-      if (CAN_FALL(element) && IN_LEV_FIELD(x, y + 1) && IS_FREE(x, y + 1) &&
-         !(element == EL_SPRING && use_spring_bug))
-       return MF_NO_ACTION;
-
-      player->Pushing = TRUE;
-
-#if 0
-      if (element == EL_ROCK)
-       printf("::: wanna push [%d] [%d]\n",
-              FrameCounter, player->push_delay_value);
-#endif
-
-      if (!IN_LEV_FIELD(x+dx, y+dy) || !IS_FREE(x+dx, y+dy))
-       return MF_NO_ACTION;
-
-      if (!checkDiagonalPushing(player, x, y, real_dx, real_dy))
-       return MF_NO_ACTION;
-
-
-      if (player->push_delay == 0)
-       player->push_delay = FrameCounter;
-
-#if 0
-      printf("want push... %d [%d]\n", FrameCounter, player->push_delay_value);
-#endif
-
-#if 0
-      if (!FrameReached(&player->push_delay, player->push_delay_value) &&
-         !tape.playing &&
-         element != EL_SPRING)
-       return MF_NO_ACTION;
-#else
-      if (!FrameReached(&player->push_delay, player->push_delay_value) &&
-         !(tape.playing && tape.file_version < FILE_VERSION_2_0) &&
-         element != EL_SPRING)
-       return MF_NO_ACTION;
-#endif
-
-      if (mode == DF_SNAP)
-      {
-       InitMovingField(x, y, move_direction);
-       ContinueMoving(x, y);
-      }
-      else
-      {
-#if 1
-       InitMovingField(x, y, (dx < 0 ? MV_LEFT :
-                              dx > 0 ? MV_RIGHT :
-                              dy < 0 ? MV_UP : MV_DOWN));
-       MovPos[x][y] = (dx != 0 ? dx : dy);
-#else
-       RemoveField(x, y);
-       Feld[x + dx][y + dy] = element;
-#endif
-      }
-
-#if 0
-      printf("pushing %d/%d ... %d [%d]\n", dx, dy,
-            FrameCounter, player->push_delay_value);
-#endif
-
-#if 0
-      if (element == EL_SPRING)
-      {
-       Feld[x + dx][y + dy] = EL_SPRING;
-       MovDir[x + dx][y + dy] = move_direction;
-      }
-#endif
-
-      player->push_delay_value = (element == EL_SPRING ? 0 : 2 + RND(8));
-
-      DrawLevelField(x + dx, y + dy);
-      PlaySoundLevelElementAction(x, y, element, ACTION_PUSHING);
-
-      CheckTriggeredElementChange(element, CE_OTHER_PUSHING);
-
-      break;
-
-#endif
-
-#if 0
-    case EL_GATE_1:
-    case EL_GATE_2:
-    case EL_GATE_3:
-    case EL_GATE_4:
-      if (!player->key[element - EL_GATE_1])
-       return MF_NO_ACTION;
-      break;
-
-    case EL_GATE_1_GRAY:
-    case EL_GATE_2_GRAY:
-    case EL_GATE_3_GRAY:
-    case EL_GATE_4_GRAY:
-      if (!player->key[element - EL_GATE_1_GRAY])
-       return MF_NO_ACTION;
-      break;
-
-    case EL_EM_GATE_1:
-    case EL_EM_GATE_2:
-    case EL_EM_GATE_3:
-    case EL_EM_GATE_4:
-      if (!player->key[element - EL_EM_GATE_1])
-       return MF_NO_ACTION;
-      if (!IN_LEV_FIELD(x + dx, y + dy) || !IS_FREE(x + dx, y + dy))
-       return MF_NO_ACTION;
-
-      /* automatically move to the next field with double speed */
-      player->programmed_action = move_direction;
-      DOUBLE_PLAYER_SPEED(player);
-
-      PlaySoundLevel(x, y, SND_CLASS_GATE_PASSING);
-      break;
-
-    case EL_EM_GATE_1_GRAY:
-    case EL_EM_GATE_2_GRAY:
-    case EL_EM_GATE_3_GRAY:
-    case EL_EM_GATE_4_GRAY:
-      if (!player->key[element - EL_EM_GATE_1_GRAY])
-       return MF_NO_ACTION;
-      if (!IN_LEV_FIELD(x + dx, y + dy) || !IS_FREE(x + dx, y + dy))
-       return MF_NO_ACTION;
-
-      /* automatically move to the next field with double speed */
-      player->programmed_action = move_direction;
-      DOUBLE_PLAYER_SPEED(player);
-
-#if 1
-      PlaySoundLevelAction(x, y, ACTION_PASSING);
-#else
-      PlaySoundLevel(x, y, SND_GATE_PASSING);
-#endif
-      break;
-#endif
-
-#if 0
-    case EL_SWITCHGATE_OPEN:
-    case EL_TIMEGATE_OPEN:
-      if (!IN_LEV_FIELD(x + dx, y + dy) || !IS_FREE(x + dx, y + dy))
-       return MF_NO_ACTION;
-
-      /* automatically move to the next field with double speed */
-      player->programmed_action = move_direction;
-      DOUBLE_PLAYER_SPEED(player);
-
-      PlaySoundLevelElementAction(x, y, element, ACTION_PASSING);
-      break;
-#endif
-
     case EL_SP_PORT_LEFT:
     case EL_SP_PORT_RIGHT:
     case EL_SP_PORT_UP:
@@ -7159,28 +7045,6 @@ int DigField(struct PlayerInfo *player,
       }
       break;
 
-#if 0
-    case EL_EXIT_CLOSED:
-    case EL_SP_EXIT_CLOSED:
-    case EL_EXIT_OPENING:
-      return MF_NO_ACTION;
-      break;
-#endif
-
-#if 0
-    case EL_EXIT_OPEN:
-    case EL_SP_EXIT_OPEN:
-      if (mode == DF_SNAP)
-       return MF_NO_ACTION;
-
-      if (element == EL_EXIT_OPEN)
-       PlaySoundLevel(x, y, SND_CLASS_EXIT_PASSING);
-      else
-       PlaySoundLevel(x, y, SND_CLASS_SP_EXIT_PASSING);
-
-      break;
-#endif
-
     case EL_LAMP:
       Feld[x][y] = EL_LAMP_ACTIVE;
       local_player->lights_still_needed--;
@@ -7198,168 +7062,6 @@ int DigField(struct PlayerInfo *player,
       return MF_ACTION;
       break;
 
-#if 0
-
-#if 0
-    case EL_SOKOBAN_FIELD_EMPTY:
-      break;
-#endif
-
-    case EL_SOKOBAN_OBJECT:
-    case EL_SOKOBAN_FIELD_FULL:
-    case EL_SATELLITE:
-    case EL_SP_DISK_YELLOW:
-    case EL_BALLOON:
-      if (mode == DF_SNAP)
-       return MF_NO_ACTION;
-
-      player->Pushing = TRUE;
-
-      if (!IN_LEV_FIELD(x+dx, y+dy)
-         || (!IS_FREE(x+dx, y+dy)
-             && (Feld[x+dx][y+dy] != EL_SOKOBAN_FIELD_EMPTY
-                 || !IS_SB_ELEMENT(element))))
-       return MF_NO_ACTION;
-
-      if (!checkDiagonalPushing(player, x, y, real_dx, real_dy))
-       return MF_NO_ACTION;
-
-      if (player->push_delay == 0)
-       player->push_delay = FrameCounter;
-#if 0
-      if (!FrameReached(&player->push_delay, player->push_delay_value) &&
-         !tape.playing && element != EL_BALLOON)
-       return MF_NO_ACTION;
-#else
-      if (!FrameReached(&player->push_delay, player->push_delay_value) &&
-         !(tape.playing && tape.file_version < FILE_VERSION_2_0) &&
-         element != EL_BALLOON)
-       return MF_NO_ACTION;
-#endif
-
-      if (IS_SB_ELEMENT(element))
-      {
-#if 1
-       if (element == EL_SOKOBAN_FIELD_FULL)
-       {
-         Back[x][y] = EL_SOKOBAN_FIELD_EMPTY;
-         local_player->sokobanfields_still_needed++;
-       }
-
-       if (Feld[x + dx][y + dy] == EL_SOKOBAN_FIELD_EMPTY)
-       {
-         Back[x + dx][y + dy] = EL_SOKOBAN_FIELD_EMPTY;
-         local_player->sokobanfields_still_needed--;
-       }
-
-       Feld[x][y] = EL_SOKOBAN_OBJECT;
-
-       if (Back[x][y] == Back[x + dx][y + dy])
-         PlaySoundLevelAction(x, y, ACTION_PUSHING);
-       else if (Back[x][y] != 0)
-         PlaySoundLevelElementAction(x, y, EL_SOKOBAN_FIELD_FULL,
-                                     ACTION_EMPTYING);
-       else
-         PlaySoundLevelElementAction(x + dx, y + dy, EL_SOKOBAN_FIELD_EMPTY,
-                                     ACTION_FILLING);
-
-       InitMovingField(x, y, (dx < 0 ? MV_LEFT :
-                              dx > 0 ? MV_RIGHT :
-                              dy < 0 ? MV_UP : MV_DOWN));
-       MovPos[x][y] = (dx != 0 ? dx : dy);
-
-#if 0
-       printf("::: %s -> %s [%s -> %s]\n",
-              element_info[Feld[x][y]].token_name,
-              element_info[Feld[x + dx][y + dy]].token_name,
-              element_info[Back[x][y]].token_name,
-              element_info[Back[x + dx][y + dy]].token_name);
-#endif
-
-#else
-       if (element == EL_SOKOBAN_FIELD_FULL)
-       {
-         Feld[x][y] = EL_SOKOBAN_FIELD_EMPTY;
-         local_player->sokobanfields_still_needed++;
-       }
-       else
-         RemoveField(x, y);
-
-       if (Feld[x+dx][y+dy] == EL_SOKOBAN_FIELD_EMPTY)
-       {
-         Feld[x+dx][y+dy] = EL_SOKOBAN_FIELD_FULL;
-         local_player->sokobanfields_still_needed--;
-         if (element == EL_SOKOBAN_OBJECT)
-#if 1
-           PlaySoundLevelAction(x+dx, y+dy, ACTION_FILLING);
-#else
-           PlaySoundLevel(x, y, SND_CLASS_SOKOBAN_FIELD_FILLING);
-#endif
-         else
-#if 1
-           PlaySoundLevelAction(x+dx, y+dy, ACTION_PUSHING);
-#else
-           PlaySoundLevel(x, y, SND_SOKOBAN_OBJECT_PUSHING);
-#endif
-       }
-       else
-       {
-         Feld[x+dx][y+dy] = EL_SOKOBAN_OBJECT;
-         if (element == EL_SOKOBAN_FIELD_FULL)
-#if 1
-           PlaySoundLevelAction(x+dx, y+dy, ACTION_EMPTYING);
-#else
-           PlaySoundLevel(x, y, SND_SOKOBAN_FIELD_EMPTYING);
-#endif
-         else
-#if 1
-           PlaySoundLevelAction(x+dx, y+dy, ACTION_PUSHING);
-#else
-           PlaySoundLevel(x, y, SND_SOKOBAN_OBJECT_PUSHING);
-#endif
-       }
-#endif
-      }
-      else
-      {
-#if 1
-       InitMovingField(x, y, (dx < 0 ? MV_LEFT :
-                              dx > 0 ? MV_RIGHT :
-                              dy < 0 ? MV_UP : MV_DOWN));
-       MovPos[x][y] = (dx != 0 ? dx : dy);
-#else
-       RemoveField(x, y);
-       Feld[x + dx][y + dy] = element;
-#endif
-       PlaySoundLevelElementAction(x, y, element, ACTION_PUSHING);
-      }
-
-      player->push_delay_value = (element == EL_BALLOON ? 0 : 2);
-
-      DrawLevelField(x, y);
-      DrawLevelField(x + dx, y + dy);
-
-      if (IS_SB_ELEMENT(element) &&
-         local_player->sokobanfields_still_needed == 0 &&
-         game.emulation == EMU_SOKOBAN)
-      {
-       player->LevelSolved = player->GameOver = TRUE;
-       PlaySoundLevel(x, y, SND_GAME_SOKOBAN_SOLVING);
-      }
-
-      CheckTriggeredElementChange(element, CE_OTHER_PUSHING);
-
-      break;
-
-#endif
-
-#if 0
-    case EL_PENGUIN:
-    case EL_PIG:
-    case EL_DRAGON:
-      break;
-#endif
-
     default:
 
       if (IS_WALKABLE(element))
@@ -7488,9 +7190,10 @@ int DigField(struct PlayerInfo *player,
                             el2edimg(EL_KEY_1 + key_nr));
          redraw_mask |= REDRAW_DOOR_1;
        }
-       else if (gem_count[element] > 0)
+       else if (element_info[element].gem_count > 0)
        {
-         local_player->gems_still_needed -= gem_count[element];
+         local_player->gems_still_needed -=
+           element_info[element].gem_count;
          if (local_player->gems_still_needed < 0)
            local_player->gems_still_needed = 0;
 
@@ -7501,7 +7204,7 @@ int DigField(struct PlayerInfo *player,
        RaiseScoreElement(element);
        PlaySoundLevelElementAction(x, y, element, ACTION_COLLECTING);
 
-       CheckTriggeredElementChange(element, CE_OTHER_COLLECTING);
+       CheckTriggeredElementChange(element, CE_OTHER_GETS_COLLECTED);
 
        break;
       }
@@ -7591,14 +7294,15 @@ int DigField(struct PlayerInfo *player,
        if (game.engine_version < RELEASE_IDENT(2,2,0,7))
          player->push_delay_value = GET_NEW_PUSH_DELAY(element);
 
-       CheckTriggeredElementChange(element, CE_OTHER_PUSHING);
-       CheckPlayerElementChange(x, y, element, CE_PUSHED_BY_PLAYER);
+       CheckTriggeredElementChange(element, CE_OTHER_GETS_PUSHED);
+       CheckElementChange(x, y, element, CE_PUSHED_BY_PLAYER);
 
        break;
       }
       else
       {
-       CheckPlayerElementChange(x, y, element, CE_PRESSED_BY_PLAYER);
+       CheckTriggeredElementChange(element, CE_OTHER_GETS_PRESSED);
+       CheckElementChange(x, y, element, CE_PRESSED_BY_PLAYER);
       }
 
       return MF_NO_ACTION;