+void MauerWaechst(int x, int y)
+{
+ int delay = 6;
+
+ if (!MovDelay[x][y]) /* next animation frame */
+ MovDelay[x][y] = 3*delay;
+
+ if (MovDelay[x][y]) /* wait some time before next frame */
+ {
+ int phase;
+
+ MovDelay[x][y]--;
+ phase = 2-MovDelay[x][y]/delay;
+ if (!(MovDelay[x][y]%delay) && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
+ DrawGraphic(SCREENX(x), SCREENY(y),
+ (MovDir[x][y] == MV_LEFT ? GFX_MAUER_LEFT :
+ MovDir[x][y] == MV_RIGHT ? GFX_MAUER_RIGHT :
+ MovDir[x][y] == MV_UP ? GFX_MAUER_UP :
+ GFX_MAUER_DOWN ) + phase);
+
+ if (!MovDelay[x][y])
+ {
+ if (MovDir[x][y] == MV_LEFT)
+ {
+ if (IN_LEV_FIELD(x-1, y) && IS_MAUER(Feld[x-1][y]))
+ DrawLevelField(x-1, y);
+ }
+ else if (MovDir[x][y] == MV_RIGHT)
+ {
+ if (IN_LEV_FIELD(x+1, y) && IS_MAUER(Feld[x+1][y]))
+ DrawLevelField(x+1, y);
+ }
+ else if (MovDir[x][y] == MV_UP)
+ {
+ if (IN_LEV_FIELD(x, y-1) && IS_MAUER(Feld[x][y-1]))
+ DrawLevelField(x, y-1);
+ }
+ else
+ {
+ if (IN_LEV_FIELD(x, y+1) && IS_MAUER(Feld[x][y+1]))
+ DrawLevelField(x, y+1);
+ }
+
+ Feld[x][y] = Store[x][y];
+ Store[x][y] = 0;
+ MovDir[x][y] = MV_NO_MOVING;
+ DrawLevelField(x, y);
+ }
+ }
+}
+
+void MauerAbleger(int ax, int ay)
+{
+ int element = Feld[ax][ay];
+ boolean oben_frei = FALSE, unten_frei = FALSE;
+ boolean links_frei = FALSE, rechts_frei = FALSE;
+ boolean oben_massiv = FALSE, unten_massiv = FALSE;
+ boolean links_massiv = FALSE, rechts_massiv = FALSE;
+
+ if (!MovDelay[ax][ay]) /* start building new wall */
+ MovDelay[ax][ay] = 6;
+
+ if (MovDelay[ax][ay]) /* wait some time before building new wall */
+ {
+ MovDelay[ax][ay]--;
+ if (MovDelay[ax][ay])
+ return;
+ }
+
+ if (IN_LEV_FIELD(ax, ay-1) && IS_FREE(ax, ay-1))
+ oben_frei = TRUE;
+ if (IN_LEV_FIELD(ax, ay+1) && IS_FREE(ax, ay+1))
+ unten_frei = TRUE;
+ if (IN_LEV_FIELD(ax-1, ay) && IS_FREE(ax-1, ay))
+ links_frei = TRUE;
+ if (IN_LEV_FIELD(ax+1, ay) && IS_FREE(ax+1, ay))
+ rechts_frei = TRUE;
+
+ if (element == EL_MAUER_Y || element == EL_MAUER_XY)
+ {
+ if (oben_frei)
+ {
+ Feld[ax][ay-1] = EL_MAUERND;
+ Store[ax][ay-1] = element;
+ MovDir[ax][ay-1] = MV_UP;
+ if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay-1)))
+ DrawGraphic(SCREENX(ax), SCREENY(ay-1), GFX_MAUER_UP);
+ }
+ if (unten_frei)
+ {
+ Feld[ax][ay+1] = EL_MAUERND;
+ Store[ax][ay+1] = element;
+ MovDir[ax][ay+1] = MV_DOWN;
+ if (IN_SCR_FIELD(SCREENX(ax), SCREENY(ay+1)))
+ DrawGraphic(SCREENX(ax), SCREENY(ay+1), GFX_MAUER_DOWN);
+ }
+ }
+
+ if (element == EL_MAUER_X || element == EL_MAUER_XY ||
+ element == EL_MAUER_LEBT)
+ {
+ if (links_frei)
+ {
+ Feld[ax-1][ay] = EL_MAUERND;
+ Store[ax-1][ay] = element;
+ MovDir[ax-1][ay] = MV_LEFT;
+ if (IN_SCR_FIELD(SCREENX(ax-1), SCREENY(ay)))
+ DrawGraphic(SCREENX(ax-1), SCREENY(ay), GFX_MAUER_LEFT);
+ }
+ if (rechts_frei)
+ {
+ Feld[ax+1][ay] = EL_MAUERND;
+ Store[ax+1][ay] = element;
+ MovDir[ax+1][ay] = MV_RIGHT;
+ if (IN_SCR_FIELD(SCREENX(ax+1), SCREENY(ay)))
+ DrawGraphic(SCREENX(ax+1), SCREENY(ay), GFX_MAUER_RIGHT);
+ }
+ }
+
+ if (element == EL_MAUER_LEBT && (links_frei || rechts_frei))
+ DrawLevelField(ax, ay);
+
+ if (!IN_LEV_FIELD(ax, ay-1) || IS_MAUER(Feld[ax][ay-1]))
+ oben_massiv = TRUE;
+ if (!IN_LEV_FIELD(ax, ay+1) || IS_MAUER(Feld[ax][ay+1]))
+ unten_massiv = TRUE;
+ if (!IN_LEV_FIELD(ax-1, ay) || IS_MAUER(Feld[ax-1][ay]))
+ links_massiv = TRUE;
+ if (!IN_LEV_FIELD(ax+1, ay) || IS_MAUER(Feld[ax+1][ay]))
+ rechts_massiv = TRUE;
+
+ if (((oben_massiv && unten_massiv) ||
+ element == EL_MAUER_X || element == EL_MAUER_LEBT) &&
+ ((links_massiv && rechts_massiv) ||
+ element == EL_MAUER_Y))
+ Feld[ax][ay] = EL_MAUERWERK;
+}
+
+void CheckForDragon(int x, int y)
+{
+ int i, j;
+ boolean dragon_found = FALSE;
+ static int xy[4][2] =
+ {
+ { 0, -1 },
+ { -1, 0 },
+ { +1, 0 },
+ { 0, +1 }
+ };
+
+ for (i=0; i<4; i++)
+ {
+ for (j=0; j<4; j++)
+ {
+ int xx = x + j*xy[i][0], yy = y + j*xy[i][1];
+
+ if (IN_LEV_FIELD(xx, yy) &&
+ (Feld[xx][yy] == EL_BURNING || Feld[xx][yy] == EL_DRACHE))
+ {
+ if (Feld[xx][yy] == EL_DRACHE)
+ dragon_found = TRUE;
+ }
+ else
+ break;
+ }
+ }
+
+ if (!dragon_found)
+ {
+ for (i=0; i<4; i++)
+ {
+ for (j=0; j<3; j++)
+ {
+ int xx = x + j*xy[i][0], yy = y + j*xy[i][1];
+
+ if (IN_LEV_FIELD(xx, yy) && Feld[xx][yy] == EL_BURNING)
+ {
+ Feld[xx][yy] = EL_LEERRAUM;
+ DrawLevelField(xx, yy);
+ }
+ else
+ break;
+ }
+ }
+ }
+}
+
+static void CheckBuggyBase(int x, int y)
+{
+ int element = Feld[x][y];
+
+ if (element == EL_SP_BUG)
+ {
+ if (!MovDelay[x][y]) /* wait some time before activating base */
+ MovDelay[x][y] = 2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND);
+
+ if (MovDelay[x][y])
+ {
+ MovDelay[x][y]--;
+ if (MovDelay[x][y] < 5 && IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
+ DrawGraphic(SCREENX(x), SCREENY(y), GFX_SP_BUG_WARNING);
+ if (MovDelay[x][y])
+ return;
+
+ Feld[x][y] = EL_SP_BUG_ACTIVE;
+ }
+ }
+ else if (element == EL_SP_BUG_ACTIVE)
+ {
+ if (!MovDelay[x][y]) /* start activating buggy base */
+ MovDelay[x][y] = 1 * FRAMES_PER_SECOND + RND(1 * FRAMES_PER_SECOND);
+
+ if (MovDelay[x][y])
+ {
+ MovDelay[x][y]--;
+ if (MovDelay[x][y])
+ {
+ int i;
+ static int xy[4][2] =
+ {
+ { 0, -1 },
+ { -1, 0 },
+ { +1, 0 },
+ { 0, +1 }
+ };
+
+ if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
+ DrawGraphic(SCREENX(x),SCREENY(y), GFX_SP_BUG_ACTIVE + SimpleRND(4));
+
+ for (i=0; i<4; i++)
+ {
+ int xx = x + xy[i][0], yy = y + xy[i][1];
+
+ if (IS_PLAYER(xx, yy))
+ {
+ PlaySoundLevel(x, y, SND_SP_BUG);
+ break;
+ }
+ }
+
+ return;
+ }
+
+ Feld[x][y] = EL_SP_BUG;
+ DrawLevelField(x, y);
+ }
+ }
+}
+
+static void CheckTrap(int x, int y)
+{
+ int element = Feld[x][y];
+
+ if (element == EL_TRAP_INACTIVE)
+ {
+ if (!MovDelay[x][y]) /* wait some time before activating trap */
+ MovDelay[x][y] = 2 * FRAMES_PER_SECOND + RND(5 * FRAMES_PER_SECOND);
+
+ if (MovDelay[x][y])
+ {
+ MovDelay[x][y]--;
+ if (MovDelay[x][y])
+ return;
+
+ Feld[x][y] = EL_TRAP_ACTIVE;
+ }
+ }
+ else if (element == EL_TRAP_ACTIVE)
+ {
+ int delay = 4;
+ int num_frames = 8;
+
+ if (!MovDelay[x][y]) /* start activating trap */
+ MovDelay[x][y] = num_frames * delay;
+
+ if (MovDelay[x][y])
+ {
+ MovDelay[x][y]--;
+
+ if (MovDelay[x][y])
+ {
+ if (!(MovDelay[x][y] % delay))
+ {
+ int phase = MovDelay[x][y]/delay;
+
+ if (phase >= num_frames/2)
+ phase = num_frames - phase;
+
+ if (IN_SCR_FIELD(SCREENX(x), SCREENY(y)))
+ {
+ DrawGraphic(SCREENX(x),SCREENY(y), GFX_TRAP_INACTIVE + phase - 1);
+ ErdreichAnbroeckeln(SCREENX(x), SCREENY(y));
+ }
+ }
+
+ return;
+ }
+
+ Feld[x][y] = EL_TRAP_INACTIVE;
+ DrawLevelField(x, y);
+ }
+ }
+}
+
+static void DrawBeltAnimation(int x, int y, int element)