rnd-20031011-2-src
[rocksndiamonds.git] / src / game.c
index 71aab9a62cb17f5557c41e8933796f4acc6bd28b..caad2f990c5ef80cdb5fc91e020bef69cdb32c3e 100644 (file)
@@ -169,6 +169,7 @@ static void KillHeroUnlessProtected(int, int);
 static void TestIfPlayerTouchesCustomElement(int, int);
 static void TestIfElementTouchesCustomElement(int, int);
 
+static void ChangeElement(int, int, int);
 static boolean CheckTriggeredElementSideChange(int, int, int, int, int);
 static boolean CheckTriggeredElementChange(int, int, int, int);
 static boolean CheckElementSideChange(int, int, int, int, int, int);
@@ -251,6 +252,22 @@ static struct ChangingElementInfo change_delay_list[] =
     NULL,
     NULL
   },
+  {
+    EL_SP_EXIT_OPENING,
+    EL_SP_EXIT_OPEN,
+    29,
+    NULL,
+    NULL,
+    NULL
+  },
+  {
+    EL_SP_EXIT_CLOSING,
+    EL_SP_EXIT_CLOSED,
+    29,
+    NULL,
+    NULL,
+    NULL
+  },
   {
     EL_SWITCHGATE_OPENING,
     EL_SWITCHGATE_OPEN,
@@ -879,7 +896,7 @@ static void InitGameEngine()
 
     for (j=0; j < ei->num_change_pages; j++)
     {
-      if (!ei->change_page->can_change)
+      if (!ei->change_page[j].can_change)
        continue;
 
       if (ei->change_page[j].events & CH_EVENT_BIT(CE_BY_OTHER_ACTION))
@@ -1016,6 +1033,9 @@ void InitGame()
     player->Frame = 0;
     player->StepFrame = 0;
 
+    player->switch_x = -1;
+    player->switch_y = -1;
+
     player->use_murphy_graphic = FALSE;
     player->use_disk_red_graphic = FALSE;
 
@@ -1083,8 +1103,11 @@ void InitGame()
   game.timegate_time_left = 0;
   game.switchgate_pos = 0;
   game.balloon_dir = MV_NO_MOVING;
+  game.gravity = level.initial_gravity;
   game.explosions_delayed = TRUE;
 
+  game.envelope_active = FALSE;
+
   for (i=0; i<4; i++)
   {
     game.belt_dir[i] = MV_NO_MOVING;
@@ -1101,6 +1124,7 @@ void InitGame()
       Feld[x][y] = level.field[x][y];
       MovPos[x][y] = MovDir[x][y] = MovDelay[x][y] = 0;
       ChangeDelay[x][y] = 0;
+      ChangePage[x][y] = -1;
       Store[x][y] = Store2[x][y] = StorePlayer[x][y] = Back[x][y] = 0;
       AmoebaNr[x][y] = 0;
       JustStopped[x][y] = 0;
@@ -1666,11 +1690,15 @@ void GameWon()
   }
 
   /* close exit door after last player */
-  if (Feld[ExitX][ExitY] == EL_EXIT_OPEN && AllPlayersGone)
+  if ((Feld[ExitX][ExitY] == EL_EXIT_OPEN ||
+       Feld[ExitX][ExitY] == EL_SP_EXIT_OPEN) && AllPlayersGone)
   {
-    Feld[ExitX][ExitY] = EL_EXIT_CLOSING;
+    int element = Feld[ExitX][ExitY];
+
+    Feld[ExitX][ExitY] = (element == EL_EXIT_OPEN ? EL_EXIT_CLOSING :
+                         EL_SP_EXIT_CLOSING);
 
-    PlaySoundLevelElementAction(ExitX, ExitY, EL_EXIT_OPEN, ACTION_CLOSING);
+    PlaySoundLevelElementAction(ExitX, ExitY, element, ACTION_CLOSING);
   }
 
   /* Hero disappears */
@@ -1912,6 +1940,7 @@ static void RemoveField(int x, int y)
 
   AmoebaNr[x][y] = 0;
   ChangeDelay[x][y] = 0;
+  ChangePage[x][y] = -1;
   Pushed[x][y] = FALSE;
 
   GfxElement[x][y] = EL_UNDEFINED;
@@ -2025,6 +2054,11 @@ void RelocatePlayer(int x, int y, int element)
 {
   struct PlayerInfo *player = &stored_player[element - EL_PLAYER_1];
 
+#if 1
+  RemoveField(x, y);
+  DrawLevelField(x, y);
+#endif
+
   if (player->present)
   {
     while (player->MovPos)
@@ -2032,14 +2066,23 @@ void RelocatePlayer(int x, int y, int element)
       ScrollFigure(player, SCROLL_GO_ON);
       ScrollScreen(NULL, SCROLL_GO_ON);
       FrameCounter++;
+
       DrawAllPlayers();
+
       BackToFront();
+      Delay(GAME_FRAME_DELAY);
     }
 
+    player->is_moving = FALSE;
+
+#if 0
     RemoveField(player->jx, player->jy);
+#endif
+
     DrawLevelField(player->jx, player->jy);
   }
 
+  Feld[x][y] = element;
   InitPlayerField(x, y, element, TRUE);
 
   if (player == local_player)
@@ -2071,7 +2114,7 @@ void RelocatePlayer(int x, int y, int element)
       ScrollLevel(dx, dy);
       DrawAllPlayers();
 
-      /* scroll in to steps of half tile size to make things smoother */
+      /* scroll in two steps of half tile size to make things smoother */
       BlitBitmap(drawto_field, window, fx, fy, SXSIZE, SYSIZE, SX, SY);
       FlushDisplay();
       Delay(GAME_FRAME_DELAY);
@@ -2321,10 +2364,10 @@ void Explode(int ex, int ey, int phase, int mode)
 
   if (GfxElement[x][y] == EL_UNDEFINED)
   {
-    printf("\n\n\n");
+    printf("\n\n");
     printf("Explode(): x = %d, y = %d: GfxElement == EL_UNDEFINED\n", x, y);
     printf("Explode(): This should never happen!\n");
-    printf("\n\n\n");
+    printf("\n\n");
 
     GfxElement[x][y] = EL_EMPTY;
   }
@@ -2369,7 +2412,10 @@ void Explode(int ex, int ey, int phase, int mode)
       element = Feld[x][y] = Back[x][y];
     Back[x][y] = 0;
 
-    MovDir[x][y] = MovPos[x][y] = MovDelay[x][y] = ChangeDelay[x][y] = 0;
+    MovDir[x][y] = MovPos[x][y] = MovDelay[x][y] = 0;
+    ChangeDelay[x][y] = 0;
+    ChangePage[x][y] = -1;
+
     InitField(x, y, FALSE);
     if (CAN_MOVE(element))
       InitMovDir(x, y);
@@ -2377,7 +2423,7 @@ void Explode(int ex, int ey, int phase, int mode)
 
     TestIfElementTouchesCustomElement(x, y);
 
-    if (CAN_BE_CRUMBLED(element))
+    if (GFX_CRUMBLED(element))
       DrawLevelFieldCrumbledSandNeighbours(x, y);
 
     if (IS_PLAYER(x, y) && !PLAYERINFO(x,y)->present)
@@ -2477,7 +2523,11 @@ void Bang(int x, int y)
   int element = Feld[x][y];
 #endif
 
+#if 1
+  if (IS_PLAYER(x, y) && !PLAYER_PROTECTED(x, y))
+#else
   if (IS_PLAYER(x, y))
+#endif
   {
     struct PlayerInfo *player = PLAYERINFO(x, y);
 
@@ -3089,6 +3139,11 @@ void Impact(int x, int y)
        else
        {
          CheckElementChange(x, y + 1, smashed, CE_SMASHED);
+
+         CheckTriggeredElementSideChange(x, y + 1, smashed, CH_SIDE_TOP,
+                                         CE_OTHER_IS_SWITCHING);
+         CheckElementSideChange(x, y + 1, smashed, CH_SIDE_TOP,
+                                CE_SWITCHED, -1);
        }
       }
       else
@@ -3647,6 +3702,13 @@ void TurnRound(int x, int y)
       MovDir[x][y] = old_move_dir;
     }
   }
+  else if (element_info[element].move_pattern == MV_WHEN_PUSHED)
+  {
+    if (!IN_LEV_FIELD_AND_IS_FREE(move_x, move_y))
+      MovDir[x][y] = MV_NO_MOVING;
+
+    MovDelay[x][y] = 0;
+  }
 }
 
 static boolean JustBeingPushed(int x, int y)
@@ -3828,6 +3890,15 @@ void StartMoving(int x, int y)
 #endif
     }
 #if 1
+
+#if 0
+    /* TEST: bug where player gets not killed by falling rock ... */
+    else if (CAN_SMASH(element) &&
+            (Feld[x][y + 1] == EL_BLOCKED ||
+             IS_PLAYER(x, y + 1)) &&
+            JustStopped[x][y] && !Pushed[x][y + 1])
+
+#else
 #if 1
     else if (game.engine_version < RELEASE_IDENT(2,2,0,7) &&
             CAN_SMASH(element) && Feld[x][y + 1] == EL_BLOCKED &&
@@ -3836,6 +3907,8 @@ void StartMoving(int x, int y)
     else if (CAN_SMASH(element) && Feld[x][y + 1] == EL_BLOCKED &&
             JustStopped[x][y])
 #endif
+#endif
+
     {
       /* calling "Impact()" here is not only completely unneccessary
         (because it already gets called from "ContinueMoving()" in
@@ -3946,11 +4019,16 @@ void StartMoving(int x, int y)
   {
     int newx, newy;
 
+#if 1
+    if (IS_PUSHABLE(element) && JustBeingPushed(x, y))
+      return;
+#else
     if ((element == EL_SATELLITE ||
         element == EL_BALLOON ||
         element == EL_SPRING)
        && JustBeingPushed(x, y))
       return;
+#endif
 
 #if 0
 #if 0
@@ -4199,6 +4277,11 @@ void StartMoving(int x, int y)
            element1 != EL_DRAGON && element2 != EL_DRAGON &&
            element1 != EL_FLAMES && element2 != EL_FLAMES)
        {
+#if 1
+         ResetGfxAnimation(x, y);
+         GfxAction[x][y] = ACTION_ATTACKING;
+#endif
+
          if (IS_PLAYER(x, y))
            DrawPlayerField(x, y);
          else
@@ -4212,6 +4295,7 @@ void StartMoving(int x, int y)
            Feld[newx1][newy1] = EL_FLAMES;
          if (IN_LEV_FIELD(newx2, newy2) && Feld[newx2][newy2] == EL_EMPTY)
            Feld[newx2][newy2] = EL_FLAMES;
+
          return;
        }
       }
@@ -4422,14 +4506,14 @@ void ContinueMoving(int x, int y)
 
     /* copy element change control values to new field */
     ChangeDelay[newx][newy] = ChangeDelay[x][y];
-#if 1
+    ChangePage[newx][newy] = ChangePage[x][y];
     Changed[newx][newy] = Changed[x][y];
     ChangeEvent[newx][newy] = ChangeEvent[x][y];
 
     ChangeDelay[x][y] = 0;
+    ChangePage[x][y] = -1;
     Changed[x][y] = CE_BITMASK_DEFAULT;
     ChangeEvent[x][y] = CE_BITMASK_DEFAULT;
-#endif
 
     /* copy animation control values to new field */
     GfxFrame[newx][newy]  = GfxFrame[x][y];
@@ -4468,6 +4552,12 @@ void ContinueMoving(int x, int y)
 
     Stop[newx][newy] = TRUE;   /* ignore this element until the next frame */
 
+    /* prevent pushed element from moving on in pushed direction */
+    if (pushed && CAN_MOVE(element) &&
+       element_info[element].move_pattern & MV_ANY_DIRECTION &&
+       !(element_info[element].move_pattern & MovDir[newx][newy]))
+      TurnRound(newx, newy);
+
     if (!pushed)       /* special case: moving object pushed by player */
       JustStopped[newx][newy] = 3;
 
@@ -4484,13 +4574,19 @@ void ContinueMoving(int x, int y)
        (newy == lev_fieldy - 1 || !IS_FREE(x, newy + 1)))
       Impact(x, newy);
 
-    if (!IN_LEV_FIELD(nextx, nexty) || !IS_FREE(nextx, nexty))
-      CheckElementChange(newx, newy, element, CE_COLLISION);
-
 #if 1
     TestIfElementTouchesCustomElement(x, y);           /* for empty space */
 #endif
 
+#if 0
+    if (ChangePage[newx][newy] != -1)                  /* delayed change */
+      ChangeElement(newx, newy, ChangePage[newx][newy]);
+#endif
+
+    if (!IN_LEV_FIELD(nextx, nexty) || !IS_FREE(nextx, nexty))
+      CheckElementSideChange(newx, newy, Feld[newx][newy], direction,
+                            CE_COLLISION, -1);
+
     TestIfPlayerTouchesCustomElement(newx, newy);
     TestIfElementTouchesCustomElement(newx, newy);
   }
@@ -5053,7 +5149,10 @@ void CheckExitSP(int x, int y)
     return;
   }
 
-  Feld[x][y] = EL_SP_EXIT_OPEN;
+  if (AllPlayersGone)  /* do not re-open exit door closed after last player */
+    return;
+
+  Feld[x][y] = EL_SP_EXIT_OPENING;
 
   PlaySoundLevelNearest(x, y, SND_CLASS_SP_EXIT_OPENING);
 }
@@ -5415,7 +5514,7 @@ static void ChangeElementNowExt(int x, int y, int target_element)
 
   DrawLevelField(x, y);
 
-  if (CAN_BE_CRUMBLED(Feld[x][y]))
+  if (GFX_CRUMBLED(Feld[x][y]))
     DrawLevelFieldCrumbledSandNeighbours(x, y);
 
   TestIfBadThingTouchesHero(x, y);
@@ -5522,6 +5621,8 @@ static boolean ChangeElementNow(int x, int y, int element, int page)
          if (IS_MOVING(ex, ey) || IS_BLOCKED(ex, ey))
            RemoveMovingField(ex, ey);
 
+         ChangeEvent[ex][ey] = ChangeEvent[x][y];
+
          ChangeElementNowExt(ex, ey, change->content[xx][yy]);
 
          something_has_changed = TRUE;
@@ -5549,16 +5650,20 @@ static boolean ChangeElementNow(int x, int y, int element, int page)
 static void ChangeElement(int x, int y, int page)
 {
   int element = MovingOrBlocked2Element(x, y);
-  struct ElementChangeInfo *change = &element_info[element].change_page[page];
+  struct ElementInfo *ei = &element_info[element];
+  struct ElementChangeInfo *change = &ei->change_page[page];
 
+#if 0
 #ifdef DEBUG
   if (!CAN_CHANGE(element))
   {
-    printf("\n\n\n");
-    printf("ChangeElement(): element = %d\n", element);
-    printf("Explode(): This should never happen!\n");
-    printf("\n\n\n");
+    printf("\n\n");
+    printf("ChangeElement(): %d,%d: element = %d ('%s')\n",
+          x, y, element, element_info[element].token_name);
+    printf("ChangeElement(): This should never happen!\n");
+    printf("\n\n");
   }
+#endif
 #endif
 
   if (ChangeDelay[x][y] == 0)          /* initialize element change */
@@ -5587,9 +5692,16 @@ static void ChangeElement(int x, int y, int page)
   }
   else                                 /* finish element change */
   {
+    if (ChangePage[x][y] != -1)                /* remember page from delayed change */
+    {
+      page = ChangePage[x][y];
+      ChangePage[x][y] = -1;
+    }
+
     if (IS_MOVING(x, y))               /* never change a running system ;-) */
     {
       ChangeDelay[x][y] = 1;           /* try change after next move step */
+      ChangePage[x][y] = page;         /* remember page to use for change */
 
       return;
     }
@@ -5617,17 +5729,17 @@ static boolean CheckTriggeredElementSideChange(int lx, int ly,
     int element = EL_CUSTOM_START + i;
 
     boolean change_element = FALSE;
-    int page;
+    int page = 0;
 
-    if (!CAN_CHANGE(element) ||
-       !HAS_ANY_CHANGE_EVENT(element, trigger_event))
+    if (!CAN_CHANGE(element) || !HAS_ANY_CHANGE_EVENT(element, trigger_event))
       continue;
 
     for (j=0; j < element_info[element].num_change_pages; j++)
     {
       struct ElementChangeInfo *change = &element_info[element].change_page[j];
 
-      if (change->sides & trigger_side &&
+      if (change->can_change &&
+         change->sides & trigger_side &&
          change->trigger_element == trigger_element)
       {
        change_element = TRUE;
@@ -5886,6 +5998,16 @@ void GameActions()
     Changed[x][y] = CE_BITMASK_DEFAULT;
     ChangeEvent[x][y] = CE_BITMASK_DEFAULT;
 
+#if DEBUG
+    if (ChangePage[x][y] != -1 && ChangeDelay[x][y] != 1)
+    {
+      printf("GameActions(): x = %d, y = %d: ChangePage != -1\n", x, y);
+      printf("GameActions(): This should never happen!\n");
+
+      ChangePage[x][y] = -1;
+    }
+#endif
+
     Stop[x][y] = FALSE;
     if (JustStopped[x][y] > 0)
       JustStopped[x][y]--;
@@ -5962,7 +6084,13 @@ void GameActions()
     /* this may take place after moving, so 'element' may have changed */
     if (IS_CHANGING(x, y))
     {
+#if 0
+      ChangeElement(x, y, ChangePage[x][y] != -1 ? ChangePage[x][y] :
+                   element_info[element].event_page_nr[CE_DELAY]);
+#else
       ChangeElement(x, y, element_info[element].event_page_nr[CE_DELAY]);
+#endif
+
       element = Feld[x][y];
       graphic = el_act_dir2img(element, GfxAction[x][y], MovDir[x][y]);
     }
@@ -6213,7 +6341,7 @@ void GameActions()
     }
   }
 
-  if (TimeFrames >= (1000 / GameFrameDelay))
+  if (TimeFrames >= FRAMES_PER_SECOND)
   {
     TimeFrames = 0;
     TimePlayed++;
@@ -6380,7 +6508,7 @@ void ScrollLevel(int dx, int dy)
 
 static void CheckGravityMovement(struct PlayerInfo *player)
 {
-  if (level.gravity && !player->programmed_action)
+  if (game.gravity && !player->programmed_action)
   {
     int move_dir_vertical = player->action & (MV_UP | MV_DOWN);
     int move_dir_horizontal = player->action & (MV_LEFT | MV_RIGHT);
@@ -6493,7 +6621,7 @@ boolean MoveFigureOneStep(struct PlayerInfo *player,
 
   ScrollFigure(player, SCROLL_INIT);
 
-#if 1
+#if 0
   if (IS_CUSTOM_ELEMENT(Feld[jx][jy]))
   {
     CheckTriggeredElementSideChange(jx, jy, Feld[jx][jy], leave_side,
@@ -6671,6 +6799,48 @@ boolean MoveFigure(struct PlayerInfo *player, int dx, int dy)
 #if 1
     player->snapped = FALSE;
 #endif
+
+#if 1
+    player->Switching = FALSE;
+#endif
+
+
+#if 1
+    {
+      static int change_sides[4][2] =
+      {
+       /* enter side           leave side */
+       { CH_SIDE_RIGHT,        CH_SIDE_LEFT    },      /* moving left  */
+       { CH_SIDE_LEFT,         CH_SIDE_RIGHT   },      /* moving right */
+       { CH_SIDE_BOTTOM,       CH_SIDE_TOP     },      /* moving up    */
+       { CH_SIDE_TOP,          CH_SIDE_BOTTOM  }       /* moving down  */
+      };
+      int move_direction = player->MovDir;
+      int enter_side = change_sides[MV_DIR_BIT(move_direction)][0];
+      int leave_side = change_sides[MV_DIR_BIT(move_direction)][1];
+
+#if 1
+      if (IS_CUSTOM_ELEMENT(Feld[old_jx][old_jy]))
+      {
+       CheckTriggeredElementSideChange(old_jx, old_jy, Feld[old_jx][old_jy],
+                                       leave_side, CE_OTHER_GETS_LEFT);
+       CheckElementSideChange(old_jx, old_jy, Feld[old_jx][old_jy],
+                              leave_side, CE_LEFT_BY_PLAYER, -1);
+      }
+
+      if (IS_CUSTOM_ELEMENT(Feld[jx][jy]))
+      {
+       CheckTriggeredElementSideChange(jx, jy, Feld[jx][jy],
+                                       enter_side, CE_OTHER_GETS_ENTERED);
+       CheckElementSideChange(jx, jy, Feld[jx][jy],
+                              enter_side, CE_ENTERED_BY_PLAYER, -1);
+      }
+#endif
+
+    }
+#endif
+
+
   }
   else
   {
@@ -6745,13 +6915,14 @@ void ScrollFigure(struct PlayerInfo *player, int mode)
     player->last_jy = jy;
 
     if (Feld[jx][jy] == EL_EXIT_OPEN ||
-       Feld[jx][jy] == EL_SP_EXIT_OPEN)
+       Feld[jx][jy] == EL_SP_EXIT_OPEN ||
+       Feld[jx][jy] == EL_SP_EXIT_OPENING)     /* <-- special case */
     {
       DrawPlayer(player);      /* needed here only to cleanup last field */
       RemoveHero(player);
 
       if (local_player->friends_still_needed == 0 ||
-         Feld[jx][jy] == EL_SP_EXIT_OPEN)
+         IS_SP_ELEMENT(Feld[jx][jy]))
        player->LevelSolved = player->GameOver = TRUE;
     }
 
@@ -6801,6 +6972,14 @@ void TestIfPlayerTouchesCustomElement(int x, int y)
     { +1, 0 },
     { 0, +1 }
   };
+  static int change_sides[4][2] =
+  {
+    /* center side       border side */
+    { CH_SIDE_TOP,     CH_SIDE_BOTTOM  },      /* check top    */
+    { CH_SIDE_LEFT,    CH_SIDE_RIGHT   },      /* check left   */
+    { CH_SIDE_RIGHT,   CH_SIDE_LEFT    },      /* check right  */
+    { CH_SIDE_BOTTOM,  CH_SIDE_TOP     }       /* check bottom */
+  };
   int i;
 
 #if 0
@@ -6814,10 +6993,30 @@ void TestIfPlayerTouchesCustomElement(int x, int y)
   {
     int xx = x + xy[i][0];
     int yy = y + xy[i][1];
+    int center_side = change_sides[i][0];
+    int border_side = change_sides[i][1];
 
     if (!IN_LEV_FIELD(xx, yy))
       continue;
 
+#if 1
+    if (IS_PLAYER(x, y))
+    {
+      CheckTriggeredElementSideChange(xx, yy, Feld[xx][yy], border_side,
+                                     CE_OTHER_GETS_TOUCHED);
+      CheckElementSideChange(xx, yy, Feld[xx][yy], border_side,
+                            CE_TOUCHED_BY_PLAYER, -1);
+    }
+    else if (IS_PLAYER(xx, yy))
+    {
+      CheckTriggeredElementSideChange(x, y, Feld[x][y], center_side,
+                                     CE_OTHER_GETS_TOUCHED);
+      CheckElementSideChange(x, y, Feld[x][y], center_side,
+                            CE_TOUCHED_BY_PLAYER, -1);
+
+      break;
+    }
+#else
     if (IS_PLAYER(x, y))
     {
       CheckTriggeredElementChange(xx, yy, Feld[xx][yy], CE_OTHER_GETS_TOUCHED);
@@ -6830,6 +7029,7 @@ void TestIfPlayerTouchesCustomElement(int x, int y)
 
       break;
     }
+#endif
   }
 
 #if 0
@@ -6857,11 +7057,28 @@ void TestIfElementTouchesCustomElement(int x, int y)
     { CH_SIDE_RIGHT,   CH_SIDE_LEFT    },      /* check right  */
     { CH_SIDE_BOTTOM,  CH_SIDE_TOP     }       /* check bottom */
   };
+  static int touch_dir[4] =
+  {
+    MV_LEFT | MV_RIGHT,
+    MV_UP   | MV_DOWN,
+    MV_UP   | MV_DOWN,
+    MV_LEFT | MV_RIGHT
+  };
   boolean change_center_element = FALSE;
   int center_element_change_page = 0;
-  int center_element = Feld[x][y];
+#if 0
+  int center_element = MovingOrBlocked2Element(x, y);
+#else
+  int center_element = Feld[x][y];     /* should always be non-moving! */
+#endif
   int i, j;
 
+#if 0
+  if (center_element == EL_CUSTOM_START + 244)
+    printf("::: checking element %d at %d,%d... [%d]\n",
+          center_element, x, y, Feld[x][y + 1]);
+#endif
+
 #if 0
   if (check_changing)  /* prevent this function from running into a loop */
     return;
@@ -6880,7 +7097,34 @@ void TestIfElementTouchesCustomElement(int x, int y)
     if (!IN_LEV_FIELD(xx, yy))
       continue;
 
-    border_element = Feld[xx][yy];
+#if 0
+    if (!IS_MOVING(xx, yy) && !IS_BLOCKED(xx, yy))
+      border_element = Feld[xx][yy];
+    else if (MovDir[xx][yy] & touch_dir[i])    /* elements are touching */
+    {
+#if 0
+      printf("::: moving && touching...\n");
+#endif
+
+      border_element = MovingOrBlocked2Element(xx, yy);
+    }
+    else
+    {
+#if 0
+      printf("::: moving && NOT touching...\n");
+#endif
+
+      continue;                        /* center and border element do not touch */
+    }
+#else
+
+#if 0
+    border_element = MovingOrBlocked2Element(xx, yy);
+#else
+    border_element = Feld[xx][yy];     /* may be moving! */
+#endif
+
+#endif
 
     /* check for change of center element (but change it only once) */
     if (IS_CUSTOM_ELEMENT(center_element) &&
@@ -6892,7 +7136,8 @@ void TestIfElementTouchesCustomElement(int x, int y)
        struct ElementChangeInfo *change =
          &element_info[center_element].change_page[j];
 
-       if (change->events & CH_EVENT_BIT(CE_OTHER_IS_TOUCHING) &&
+       if (change->can_change &&
+           change->events & CH_EVENT_BIT(CE_OTHER_IS_TOUCHING) &&
            change->sides & border_side &&
            change->trigger_element == border_element)
        {
@@ -6913,10 +7158,16 @@ void TestIfElementTouchesCustomElement(int x, int y)
        struct ElementChangeInfo *change =
          &element_info[border_element].change_page[j];
 
-       if (change->events & CH_EVENT_BIT(CE_OTHER_IS_TOUCHING) &&
+       if (change->can_change &&
+           change->events & CH_EVENT_BIT(CE_OTHER_IS_TOUCHING) &&
            change->sides & center_side &&
            change->trigger_element == center_element)
        {
+#if 0
+         printf("::: changing border element %d at %d,%d\n",
+                border_element, xx, yy);
+#endif
+
          CheckElementSideChange(xx, yy, border_element, CH_SIDE_ANY,
                                 CE_OTHER_IS_TOUCHING, j);
          break;
@@ -6926,8 +7177,15 @@ void TestIfElementTouchesCustomElement(int x, int y)
   }
 
   if (change_center_element)
+  {
+#if 0
+    printf("::: changing center element %d at %d,%d\n",
+          center_element, x, y);
+#endif
+
     CheckElementSideChange(x, y, center_element, CH_SIDE_ANY,
                           CE_OTHER_IS_TOUCHING, center_element_change_page);
+  }
 
 #if 0
   check_changing = FALSE;
@@ -7263,16 +7521,13 @@ static boolean checkDiagonalPushing(struct PlayerInfo *player,
 int DigField(struct PlayerInfo *player,
             int x, int y, int real_dx, int real_dy, int mode)
 {
-#if 0
-  static int change_sides[4][2] =
+  static int change_sides[4] =
   {
-    /* enter side        leave side */
-    { CH_SIDE_RIGHT,   CH_SIDE_LEFT    },      /* moving left  */
-    { CH_SIDE_LEFT,    CH_SIDE_RIGHT   },      /* moving right */
-    { CH_SIDE_BOTTOM,  CH_SIDE_TOP     },      /* moving up    */
-    { CH_SIDE_TOP,     CH_SIDE_BOTTOM  }       /* moving down  */
+    CH_SIDE_RIGHT,     /* moving left  */
+    CH_SIDE_LEFT,      /* moving right */
+    CH_SIDE_BOTTOM,    /* moving up    */
+    CH_SIDE_TOP,       /* moving down  */
   };
-#endif
   boolean use_spring_bug = (game.engine_version < VERSION_IDENT(2,2,0));
   int jx = player->jx, jy = player->jy;
   int dx = x - jx, dy = y - jy;
@@ -7281,10 +7536,7 @@ int DigField(struct PlayerInfo *player,
                        dx == +1 ? MV_RIGHT :
                        dy == -1 ? MV_UP :
                        dy == +1 ? MV_DOWN : MV_NO_MOVING);
-#if 0
-  int enter_side = change_sides[MV_DIR_BIT(move_direction)][0];
-  int leave_side = change_sides[MV_DIR_BIT(move_direction)][1];
-#endif
+  int dig_side = change_sides[MV_DIR_BIT(move_direction)];
   int element;
 
   if (player->MovPos == 0)
@@ -7351,6 +7603,7 @@ int DigField(struct PlayerInfo *player,
 
   switch (element)
   {
+#if 0
     case EL_ROBOT_WHEEL:
       Feld[x][y] = EL_ROBOT_WHEEL_ACTIVE;
       ZX = x;
@@ -7359,7 +7612,9 @@ int DigField(struct PlayerInfo *player,
       PlaySoundLevel(x, y, SND_ROBOT_WHEEL_ACTIVATING);
       return MF_ACTION;
       break;
+#endif
 
+#if 0
     case EL_SP_TERMINAL:
       {
        int xx, yy;
@@ -7380,7 +7635,9 @@ int DigField(struct PlayerInfo *player,
        return MF_ACTION;
       }
       break;
+#endif
 
+#if 0
     case EL_CONVEYOR_BELT_1_SWITCH_LEFT:
     case EL_CONVEYOR_BELT_1_SWITCH_MIDDLE:
     case EL_CONVEYOR_BELT_1_SWITCH_RIGHT:
@@ -7393,31 +7650,56 @@ int DigField(struct PlayerInfo *player,
     case EL_CONVEYOR_BELT_4_SWITCH_LEFT:
     case EL_CONVEYOR_BELT_4_SWITCH_MIDDLE:
     case EL_CONVEYOR_BELT_4_SWITCH_RIGHT:
+#if 1
+      if (!PLAYER_SWITCHING(player, x, y))
+#else
       if (!player->Switching)
+#endif
       {
        player->Switching = TRUE;
+       player->switch_x = x;
+       player->switch_y = y;
+
        ToggleBeltSwitch(x, y);
        PlaySoundLevel(x, y, SND_CLASS_CONVEYOR_BELT_SWITCH_ACTIVATING);
       }
       return MF_ACTION;
       break;
+#endif
 
+#if 0
     case EL_SWITCHGATE_SWITCH_UP:
     case EL_SWITCHGATE_SWITCH_DOWN:
+#if 1
+      if (!PLAYER_SWITCHING(player, x, y))
+#else
       if (!player->Switching)
+#endif
       {
        player->Switching = TRUE;
+       player->switch_x = x;
+       player->switch_y = y;
+
        ToggleSwitchgateSwitch(x, y);
        PlaySoundLevel(x, y, SND_CLASS_SWITCHGATE_SWITCH_ACTIVATING);
       }
       return MF_ACTION;
       break;
+#endif
 
+#if 0
     case EL_LIGHT_SWITCH:
     case EL_LIGHT_SWITCH_ACTIVE:
+#if 1
+      if (!PLAYER_SWITCHING(player, x, y))
+#else
       if (!player->Switching)
+#endif
       {
        player->Switching = TRUE;
+       player->switch_x = x;
+       player->switch_y = y;
+
        ToggleLightSwitch(x, y);
        PlaySoundLevel(x, y, element == EL_LIGHT_SWITCH ?
                       SND_LIGHT_SWITCH_ACTIVATING :
@@ -7425,14 +7707,18 @@ int DigField(struct PlayerInfo *player,
       }
       return MF_ACTION;
       break;
+#endif
 
+#if 0
     case EL_TIMEGATE_SWITCH:
       ActivateTimegateSwitch(x, y);
       PlaySoundLevel(x, y, SND_TIMEGATE_SWITCH_ACTIVATING);
 
       return MF_ACTION;
       break;
+#endif
 
+#if 0
     case EL_BALLOON_SWITCH_LEFT:
     case EL_BALLOON_SWITCH_RIGHT:
     case EL_BALLOON_SWITCH_UP:
@@ -7450,6 +7736,7 @@ int DigField(struct PlayerInfo *player,
 
       return MF_ACTION;
       break;
+#endif
 
     case EL_SP_PORT_LEFT:
     case EL_SP_PORT_RIGHT:
@@ -7490,7 +7777,7 @@ int DigField(struct PlayerInfo *player,
          element == EL_SP_GRAVITY_PORT_RIGHT ||
          element == EL_SP_GRAVITY_PORT_UP ||
          element == EL_SP_GRAVITY_PORT_DOWN)
-       level.gravity = !level.gravity;
+       game.gravity = !game.gravity;
 
       /* automatically move to the next field with double speed */
       player->programmed_action = move_direction;
@@ -7542,6 +7829,7 @@ int DigField(struct PlayerInfo *player,
       }
       break;
 
+#if 0
     case EL_LAMP:
       Feld[x][y] = EL_LAMP_ACTIVE;
       local_player->lights_still_needed--;
@@ -7549,7 +7837,9 @@ int DigField(struct PlayerInfo *player,
       PlaySoundLevel(x, y, SND_LAMP_ACTIVATING);
       return MF_ACTION;
       break;
+#endif
 
+#if 0
     case EL_TIME_ORB_FULL:
       Feld[x][y] = EL_TIME_ORB_EMPTY;
       TimeLeft += 10;
@@ -7558,6 +7848,7 @@ int DigField(struct PlayerInfo *player,
       PlaySoundStereo(SND_TIME_ORB_FULL_COLLECTING, SOUND_MIDDLE);
       return MF_ACTION;
       break;
+#endif
 
     default:
 
@@ -7575,7 +7866,9 @@ int DigField(struct PlayerInfo *player,
          if (!player->key[element - EL_GATE_1_GRAY])
            return MF_NO_ACTION;
        }
-       else if (element == EL_EXIT_OPEN || element == EL_SP_EXIT_OPEN)
+       else if (element == EL_EXIT_OPEN ||
+                element == EL_SP_EXIT_OPEN ||
+                element == EL_SP_EXIT_OPENING)
        {
          sound_action = ACTION_PASSING;        /* player is passing exit */
        }
@@ -7597,6 +7890,11 @@ int DigField(struct PlayerInfo *player,
        if (!IN_LEV_FIELD(nextx, nexty) || !IS_FREE(nextx, nexty))
          return MF_NO_ACTION;
 
+#if 1
+       if (CAN_MOVE(element))  /* only fixed elements can be passed! */
+         return MF_NO_ACTION;
+#endif
+
        if (element >= EL_EM_GATE_1 && element <= EL_EM_GATE_4)
        {
          if (!player->key[element - EL_EM_GATE_1])
@@ -7626,7 +7924,7 @@ int DigField(struct PlayerInfo *player,
          GfxElement[x][y] = GFX_ELEMENT(element);
 #else
          GfxElement[x][y] =
-           (CAN_BE_CRUMBLED(element) ? EL_SAND : GFX_ELEMENT(element));
+           (GFX_CRUMBLED(element) ? EL_SAND : GFX_ELEMENT(element));
 #endif
          player->is_digging = TRUE;
        }
@@ -7748,9 +8046,15 @@ int DigField(struct PlayerInfo *player,
            !(element == EL_SPRING && use_spring_bug))
          return MF_NO_ACTION;
 
+#if 1
+       /* do not push elements already moving away faster than player */
+       if (CAN_MOVE(element) && MovDir[x][y] == move_direction &&
+           ABS(getElementMoveStepsize(x, y)) > MOVE_STEPSIZE_NORMAL)
+         return MF_NO_ACTION;
+#else
        if (element == EL_SPRING && MovDir[x][y] != MV_NO_MOVING)
          return MF_NO_ACTION;
-
+#endif
        if (!player->Pushing &&
            game.engine_version >= RELEASE_IDENT(2,2,0,7))
          player->push_delay_value = GET_NEW_PUSH_DELAY(element);
@@ -7823,15 +8127,187 @@ int DigField(struct PlayerInfo *player,
        if (game.engine_version < RELEASE_IDENT(2,2,0,7))
          player->push_delay_value = GET_NEW_PUSH_DELAY(element);
 
+#if 1
+       CheckTriggeredElementSideChange(x, y, element, dig_side,
+                                       CE_OTHER_GETS_PUSHED);
+       CheckElementSideChange(x, y, element, dig_side,
+                              CE_PUSHED_BY_PLAYER, -1);
+#else
        CheckTriggeredElementChange(x, y, element, CE_OTHER_GETS_PUSHED);
        CheckElementChange(x, y, element, CE_PUSHED_BY_PLAYER);
+#endif
 
        break;
       }
+      else if (IS_SWITCHABLE(element))
+      {
+       if (PLAYER_SWITCHING(player, x, y))
+         return MF_ACTION;
+
+#if 1
+       PlaySoundLevelElementAction(x, y, element, ACTION_ACTIVATING);
+#endif
+
+       if (element == EL_ROBOT_WHEEL)
+       {
+         Feld[x][y] = EL_ROBOT_WHEEL_ACTIVE;
+         ZX = x;
+         ZY = y;
+
+         DrawLevelField(x, y);
+
+#if 0
+         PlaySoundLevel(x, y, SND_ROBOT_WHEEL_ACTIVATING);
+#endif
+       }
+       else if (element == EL_SP_TERMINAL)
+       {
+         int xx, yy;
+
+#if 0
+         PlaySoundLevel(x, y, SND_SP_TERMINAL_ACTIVATING);
+#endif
+
+         for (yy=0; yy<lev_fieldy; yy++)
+         {
+           for (xx=0; xx<lev_fieldx; xx++)
+           {
+             if (Feld[xx][yy] == EL_SP_DISK_YELLOW)
+               Bang(xx, yy);
+             else if (Feld[xx][yy] == EL_SP_TERMINAL)
+               Feld[xx][yy] = EL_SP_TERMINAL_ACTIVE;
+           }
+         }
+       }
+       else if (IS_BELT_SWITCH(element))
+       {
+#if 0
+         if (!PLAYER_SWITCHING(player, x, y))
+#endif
+         {
+           player->Switching = TRUE;
+           player->switch_x = x;
+           player->switch_y = y;
+
+           ToggleBeltSwitch(x, y);
+
+#if 0
+           PlaySoundLevel(x, y, SND_CLASS_CONVEYOR_BELT_SWITCH_ACTIVATING);
+#endif
+         }
+       }
+       else if (element == EL_SWITCHGATE_SWITCH_UP ||
+                element == EL_SWITCHGATE_SWITCH_DOWN)
+       {
+#if 0
+         if (!PLAYER_SWITCHING(player, x, y))
+#endif
+         {
+           player->Switching = TRUE;
+           player->switch_x = x;
+           player->switch_y = y;
+
+           ToggleSwitchgateSwitch(x, y);
+
+#if 0
+           PlaySoundLevel(x, y, SND_CLASS_SWITCHGATE_SWITCH_ACTIVATING);
+#endif
+         }
+       }
+       else if (element == EL_LIGHT_SWITCH ||
+                element == EL_LIGHT_SWITCH_ACTIVE)
+       {
+#if 0
+         if (!PLAYER_SWITCHING(player, x, y))
+#endif
+         {
+           player->Switching = TRUE;
+           player->switch_x = x;
+           player->switch_y = y;
+
+           ToggleLightSwitch(x, y);
+
+#if 0
+           PlaySoundLevel(x, y, element == EL_LIGHT_SWITCH ?
+                          SND_LIGHT_SWITCH_ACTIVATING :
+                          SND_LIGHT_SWITCH_DEACTIVATING);
+#endif
+         }
+       }
+       else if (element == EL_TIMEGATE_SWITCH)
+       {
+         ActivateTimegateSwitch(x, y);
+
+#if 0
+         PlaySoundLevel(x, y, SND_TIMEGATE_SWITCH_ACTIVATING);
+#endif
+       }
+       else if (element == EL_BALLOON_SWITCH_LEFT ||
+                element == EL_BALLOON_SWITCH_RIGHT ||
+                element == EL_BALLOON_SWITCH_UP ||
+                element == EL_BALLOON_SWITCH_DOWN ||
+                element == EL_BALLOON_SWITCH_ANY)
+       {
+         if (element == EL_BALLOON_SWITCH_ANY)
+           game.balloon_dir = move_direction;
+         else
+           game.balloon_dir = (element == EL_BALLOON_SWITCH_LEFT  ? MV_LEFT :
+                               element == EL_BALLOON_SWITCH_RIGHT ? MV_RIGHT :
+                               element == EL_BALLOON_SWITCH_UP    ? MV_UP :
+                               element == EL_BALLOON_SWITCH_DOWN  ? MV_DOWN :
+                               MV_NO_MOVING);
+
+#if 0
+         PlaySoundLevel(x, y, SND_CLASS_BALLOON_SWITCH_ACTIVATING);
+#endif
+       }
+       else if (element == EL_LAMP)
+       {
+         Feld[x][y] = EL_LAMP_ACTIVE;
+         local_player->lights_still_needed--;
+
+         DrawLevelField(x, y);
+
+#if 0
+         PlaySoundLevel(x, y, SND_LAMP_ACTIVATING);
+#endif
+       }
+       else if (element == EL_TIME_ORB_FULL)
+       {
+         Feld[x][y] = EL_TIME_ORB_EMPTY;
+         TimeLeft += 10;
+         DrawText(DX_TIME, DY_TIME, int2str(TimeLeft, 3), FONT_TEXT_2);
+
+         DrawLevelField(x, y);
+
+#if 0
+         PlaySoundStereo(SND_TIME_ORB_FULL_COLLECTING, SOUND_MIDDLE);
+#endif
+       }
+
+       return MF_ACTION;
+      }
       else
       {
-       CheckTriggeredElementChange(x, y, element, CE_OTHER_GETS_PRESSED);
-       CheckElementChange(x, y, element, CE_PRESSED_BY_PLAYER);
+#if 1
+       if (!PLAYER_SWITCHING(player, x, y))
+#else
+       if (!player->Switching)
+#endif
+       {
+         player->Switching = TRUE;
+         player->switch_x = x;
+         player->switch_y = y;
+
+         CheckTriggeredElementSideChange(x, y, element, dig_side,
+                                         CE_OTHER_IS_SWITCHING);
+         CheckElementSideChange(x, y, element, dig_side, CE_SWITCHED, -1);
+       }
+
+       CheckTriggeredElementSideChange(x, y, element, dig_side,
+                                       CE_OTHER_GETS_PRESSED);
+       CheckElementSideChange(x, y, element, dig_side,
+                              CE_PRESSED_BY_PLAYER, -1);
       }
 
       return MF_NO_ACTION;
@@ -7842,24 +8318,6 @@ int DigField(struct PlayerInfo *player,
   if (Feld[x][y] != element)           /* really digged/collected something */
     player->is_collecting = !player->is_digging;
 
-#if 0
-  if (IS_CUSTOM_ELEMENT(Feld[jx][jy]))
-  {
-    CheckTriggeredElementSideChange(jx, jy, Feld[jx][jy], leave_side,
-                                   CE_OTHER_GETS_LEFT);
-    CheckElementSideChange(jx, jy, Feld[jx][jy], leave_side,
-                          CE_LEFT_BY_PLAYER, -1);
-  }
-
-  if (IS_CUSTOM_ELEMENT(Feld[x][y]))
-  {
-    CheckTriggeredElementSideChange(x, y, Feld[x][y], enter_side,
-                                   CE_OTHER_GETS_ENTERED);
-    CheckElementSideChange(x, y, Feld[x][y], enter_side,
-                          CE_ENTERED_BY_PLAYER, -1);
-  }
-#endif
-
   return MF_MOVING;
 }