+ return EL_EMPTY;
+}
+
+static int getSteel2FromOpenDirectionNotEmpty(int direction, int element_old)
+{
+ int element_new = getSteel2FromOpenDirection(direction);
+
+ return (element_new != EL_EMPTY ? element_new : element_old);
+}
+
+static int getOpenDirectionFromChip(int element)
+{
+ switch (element)
+ {
+ case EL_SP_CHIP_SINGLE: return (MV_NONE);
+ case EL_SP_CHIP_LEFT: return (MV_RIGHT);
+ case EL_SP_CHIP_RIGHT: return (MV_LEFT);
+ case EL_SP_CHIP_TOP: return (MV_DOWN);
+ case EL_SP_CHIP_BOTTOM: return (MV_UP);
+ }
+
+ return MV_NONE;
+}
+
+static int getChipFromOpenDirection(int direction)
+{
+ switch (direction)
+ {
+ case (MV_NONE): return EL_SP_CHIP_SINGLE;
+ case (MV_LEFT): return EL_SP_CHIP_RIGHT;
+ case (MV_RIGHT): return EL_SP_CHIP_LEFT;
+ case (MV_UP): return EL_SP_CHIP_BOTTOM;
+ case (MV_DOWN): return EL_SP_CHIP_TOP;
+ }
+
+ return EL_EMPTY;
+}
+
+static int getChipFromOpenDirectionNotEmpty(int direction, int element_old)
+{
+ int element_new = getChipFromOpenDirection(direction);
+
+ return (element_new != EL_EMPTY ? element_new : element_old);
+}
+
+static int getClosedTube(int x, int y)
+{
+ static int xy[4][2] =
+ {
+ { -1, 0 },
+ { +1, 0 },
+ { 0, -1 },
+ { 0, +1 }
+ };
+ int element_old = IntelliDrawBuffer[x][y];
+ int direction_old = getOpenDirectionFromTube(element_old);
+ int direction_new = MV_NONE;
+ int i;
+
+ for (i = 0; i < NUM_DIRECTIONS; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+
+ if (IN_LEV_FIELD(xx, yy) && IS_TUBE(IntelliDrawBuffer[xx][yy]) &&
+ (direction_old & dir) &&
+ (getOpenDirectionFromTube(IntelliDrawBuffer[xx][yy]) & dir_opposite))
+ direction_new |= dir;
+ }
+
+ return getTubeFromOpenDirectionNotEmpty(direction_new, element_old);
+}
+
+static int getClosedBelt(int x, int y)
+{
+ static int xy[4][2] =
+ {
+ { -1, 0 },
+ { +1, 0 },
+ { 0, -1 },
+ { 0, +1 }
+ };
+ int element_old = IntelliDrawBuffer[x][y];
+ int nr = getBeltNrFromBeltElement(element_old);
+ int direction_old = getOpenDirectionFromBelt(element_old);
+ int direction_new = MV_NONE;
+ int i;
+
+ for (i = MV_BIT_LEFT; i <= MV_BIT_RIGHT; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+
+ if (IN_LEV_FIELD(xx, yy) && IS_BELT(IntelliDrawBuffer[xx][yy]) &&
+ (direction_old & dir) &&
+ (getOpenDirectionFromBelt(IntelliDrawBuffer[xx][yy]) & dir_opposite))
+ direction_new |= dir;
+ }
+
+ return getBeltFromNrAndOpenDirection(nr, direction_new);
+}
+
+static int getClosedPool(int x, int y)
+{
+ static int xy[4][2] =
+ {
+ { -1, 0 },
+ { +1, 0 },
+ { 0, -1 },
+ { 0, +1 }
+ };
+ int element_old = IntelliDrawBuffer[x][y];
+ int direction_old = getOpenDirectionFromPool(element_old);
+ int direction_new = MV_NONE;
+ int i;
+
+ for (i = 0; i < NUM_DIRECTIONS; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+
+ if (IN_LEV_FIELD(xx, yy) &&
+ IS_ACID_POOL_OR_ACID(IntelliDrawBuffer[xx][yy]) &&
+ (direction_old & dir) &&
+ (getOpenDirectionFromPool(IntelliDrawBuffer[xx][yy]) & dir_opposite))
+ direction_new |= dir;
+ }
+
+ return getPoolFromOpenDirectionNotEmpty(direction_new, element_old);
+}
+
+static int getClosedPillar(int x, int y)
+{
+ static int xy[4][2] =
+ {
+ { -1, 0 },
+ { +1, 0 },
+ { 0, -1 },
+ { 0, +1 }
+ };
+ int element_old = IntelliDrawBuffer[x][y];
+ int direction_old = getOpenDirectionFromPillar(element_old);
+ int direction_new = MV_NONE;
+ int i;
+
+ for (i = MV_BIT_UP; i <= MV_BIT_DOWN; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+
+ if (IN_LEV_FIELD(xx, yy) && IS_EMC_PILLAR(IntelliDrawBuffer[xx][yy]) &&
+ (direction_old & dir) &&
+ (getOpenDirectionFromPillar(IntelliDrawBuffer[xx][yy]) & dir_opposite))
+ direction_new |= dir;
+ }
+
+ return getPillarFromOpenDirectionNotEmpty(direction_new, element_old);
+}
+
+static int getClosedSteel2(int x, int y)
+{
+ static int xy[4][2] =
+ {
+ { -1, 0 },
+ { +1, 0 },
+ { 0, -1 },
+ { 0, +1 }
+ };
+ int element_old = IntelliDrawBuffer[x][y];
+ int direction_old = getOpenDirectionFromSteel2(element_old);
+ int direction_new = MV_NONE;
+ int i;
+
+ for (i = 0; i < NUM_DIRECTIONS; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+
+ if (IN_LEV_FIELD(xx, yy) && IS_DC_STEELWALL_2(IntelliDrawBuffer[xx][yy]) &&
+ (direction_old & dir) &&
+ (getOpenDirectionFromSteel2(IntelliDrawBuffer[xx][yy]) & dir_opposite))
+ direction_new |= dir;
+ }
+
+ return getSteel2FromOpenDirectionNotEmpty(direction_new, element_old);
+}
+
+static int getClosedChip(int x, int y)
+{
+ static int xy[4][2] =
+ {
+ { -1, 0 },
+ { +1, 0 },
+ { 0, -1 },
+ { 0, +1 }
+ };
+ int element_old = IntelliDrawBuffer[x][y];
+ int direction_old = getOpenDirectionFromChip(element_old);
+ int direction_new = MV_NONE;
+ int i;
+
+ for (i = 0; i < NUM_DIRECTIONS; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+
+ if (IN_LEV_FIELD(xx, yy) && IS_SP_CHIP(IntelliDrawBuffer[xx][yy]) &&
+ (direction_old & dir) &&
+ (getOpenDirectionFromChip(IntelliDrawBuffer[xx][yy]) & dir_opposite))
+ direction_new |= dir;
+ }
+
+ return getChipFromOpenDirectionNotEmpty(direction_new, element_old);
+}
+
+static void SetElementSimpleExt(int x, int y, int dx, int dy, int element,
+ boolean change_level)
+{
+ int sx = x - level_xpos;
+ int sy = y - level_ypos;
+ int old_element = Feld[x][y];
+ int new_element = element;
+ unsigned int new_bitmask = (getDrawModeHiRes() ? (dx + 1) << (dy * 2) : 0x0f);
+ boolean draw_masked = FALSE;
+
+ if (IS_MM_WALL_EDITOR(element))
+ {
+ element = map_mm_wall_element_editor(element) | new_bitmask;
+
+ if (IS_MM_WALL(old_element))
+ element |= MM_WALL_BITS(old_element);
+
+ if (!change_level)
+ draw_masked = TRUE;
+ }
+ else if (IS_MM_WALL(old_element) && element == EL_EMPTY)
+ {
+ int element_changed = old_element & ~new_bitmask;
+
+ if (MM_WALL_BITS(element_changed) != 0)
+ element = element_changed;
+ }
+
+ IntelliDrawBuffer[x][y] = element;
+
+ if (change_level)
+ Feld[x][y] = element;
+
+ if (IN_ED_FIELD(sx, sy))
+ {
+ if (IS_MM_WALL(old_element) && new_element == EL_EMPTY)
+ DrawSizedWallParts_MM(sx, sy, EL_EMPTY, ed_tilesize, FALSE, new_bitmask);
+ else if (draw_masked)
+ DrawEditorElementThruMask(sx, sy, element);
+ else
+ DrawEditorElement(sx, sy, element);
+ }
+}
+
+static void SetElementSimple(int x, int y, int element, boolean change_level)
+{
+ SetElementSimpleExt(x, y, 0, 0, element, change_level);
+}
+
+static void MergeAndCloseNeighbourElements(int x1, int y1, int *element1,
+ int x2, int y2, int *element2,
+ int (*close_function)(int, int),
+ boolean change_level)
+{
+ /* set neighbour elements to newly determined connections */
+ SetElementSimple(x1, y1, *element1, change_level);
+ SetElementSimple(x2, y2, *element2, change_level);
+
+ /* remove all open connections of neighbour elements */
+ *element1 = close_function(x1, y1);
+ *element2 = close_function(x2, y2);
+
+ /* set neighbour elements to new, minimized connections */
+ SetElementSimple(x1, y1, *element1, change_level);
+ SetElementSimple(x2, y2, *element2, change_level);
+}
+
+static void SetElementIntelliDraw(int x, int y, int new_element,
+ boolean change_level, int button)
+{
+ static int xy[4][2] =
+ {
+ { -1, 0 },
+ { +1, 0 },
+ { 0, -1 },
+ { 0, +1 }
+ };
+ static int last_x = -1;
+ static int last_y = -1;
+ int old_element = IntelliDrawBuffer[x][y];
+
+ if (new_element == EL_UNDEFINED)
+ {
+ last_x = -1;
+ last_y = -1;
+
+ return;
+ }
+
+ if (IS_TUBE(new_element))
+ {
+ int last_element_new = EL_UNDEFINED;
+ int direction = MV_NONE;
+ int i;
+
+ /* if old element is of same kind, keep all existing directions */
+ if (IS_TUBE(old_element))
+ direction |= getOpenDirectionFromTube(old_element);
+
+ for (i = 0; i < NUM_DIRECTIONS; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+
+ if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
+ IS_TUBE(IntelliDrawBuffer[last_x][last_y]))
+ {
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+ int last_element_old = IntelliDrawBuffer[last_x][last_y];
+ int last_direction_old = getOpenDirectionFromTube(last_element_old);
+ int last_direction_new = last_direction_old | dir_opposite;
+
+ last_element_new = getTubeFromOpenDirection(last_direction_new);
+
+ direction |= dir;
+ }
+ }
+
+ new_element = getTubeFromOpenDirectionNotEmpty(direction, new_element);
+
+ if (last_element_new != EL_UNDEFINED)
+ MergeAndCloseNeighbourElements(x, y, &new_element,
+ last_x, last_y, &last_element_new,
+ getClosedTube, change_level);
+ }
+ else if (IS_BELT(new_element))
+ {
+ int belt_nr = getBeltNrFromBeltElement(new_element);
+ int last_element_new = EL_UNDEFINED;
+ int direction = MV_NONE;
+ int i;
+
+ /* if old element is of same kind, keep all existing directions */
+ if (IS_BELT(old_element))
+ direction |= getOpenDirectionFromBelt(old_element);
+
+ for (i = MV_BIT_LEFT; i <= MV_BIT_RIGHT; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+
+ if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
+ IS_BELT(IntelliDrawBuffer[last_x][last_y]))
+ {
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+ int last_element_old = IntelliDrawBuffer[last_x][last_y];
+ int last_belt_nr = getBeltNrFromBeltElement(last_element_old);
+ int last_direction_old = getOpenDirectionFromBelt(last_element_old);
+ int last_direction_new = last_direction_old | dir_opposite;
+
+ last_element_new = getBeltFromNrAndOpenDirection(last_belt_nr,
+ last_direction_new);
+ direction |= dir;
+ }
+ }
+
+ new_element = getBeltFromNrAndOpenDirectionNotEmpty(belt_nr, direction,
+ new_element);
+ if (last_element_new != EL_UNDEFINED)
+ MergeAndCloseNeighbourElements(x, y, &new_element,
+ last_x, last_y, &last_element_new,
+ getClosedBelt, change_level);
+ }
+ else if (IS_ACID_POOL_OR_ACID(new_element))
+ {
+ int last_element_new = EL_UNDEFINED;
+ int direction = MV_NONE;
+ int i;
+
+ /* if old element is of same kind, keep all existing directions */
+ if (IS_ACID_POOL_OR_ACID(old_element))
+ direction |= getOpenDirectionFromPool(old_element);
+
+ for (i = 0; i < NUM_DIRECTIONS; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+
+ if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
+ IS_ACID_POOL_OR_ACID(IntelliDrawBuffer[last_x][last_y]))
+ {
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+ int last_element_old = IntelliDrawBuffer[last_x][last_y];
+ int last_direction_old = getOpenDirectionFromPool(last_element_old);
+ int last_direction_new = last_direction_old | dir_opposite;
+
+ last_element_new = getPoolFromOpenDirection(last_direction_new);
+
+ direction |= dir;
+ }
+ }
+
+ /* special corrections needed for intuitively correct acid pool drawing */
+ if (last_element_new == EL_EMPTY)
+ last_element_new = new_element;
+ else if (last_element_new != EL_UNDEFINED)
+ new_element = last_element_new;
+
+ new_element = getPoolFromOpenDirectionNotEmpty(direction, new_element);
+
+ if (last_element_new != EL_UNDEFINED)
+ MergeAndCloseNeighbourElements(x, y, &new_element,
+ last_x, last_y, &last_element_new,
+ getClosedPool, change_level);
+ }
+ else if (IS_EMC_PILLAR(new_element))
+ {
+ int last_element_new = EL_UNDEFINED;
+ int direction = MV_NONE;
+ int i;
+
+ /* if old element is of same kind, keep all existing directions */
+ if (IS_EMC_PILLAR(old_element))
+ direction |= getOpenDirectionFromPillar(old_element);
+
+ for (i = MV_BIT_UP; i <= MV_BIT_DOWN; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+
+ if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
+ IS_EMC_PILLAR(IntelliDrawBuffer[last_x][last_y]))
+ {
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+ int last_element_old = IntelliDrawBuffer[last_x][last_y];
+ int last_direction_old = getOpenDirectionFromPillar(last_element_old);
+ int last_direction_new = last_direction_old | dir_opposite;
+
+ last_element_new = getPillarFromOpenDirection(last_direction_new);
+
+ direction |= dir;
+ }
+ }
+
+ new_element = getPillarFromOpenDirectionNotEmpty(direction, new_element);
+
+ if (last_element_new != EL_UNDEFINED)
+ MergeAndCloseNeighbourElements(x, y, &new_element,
+ last_x, last_y, &last_element_new,
+ getClosedPillar, change_level);
+ }
+ else if (IS_DC_STEELWALL_2(new_element))
+ {
+ int last_element_new = EL_UNDEFINED;
+ int direction = MV_NONE;
+ int i;
+
+ /* if old element is of same kind, keep all existing directions */
+ if (IS_DC_STEELWALL_2(old_element))
+ direction |= getOpenDirectionFromSteel2(old_element);
+
+ for (i = 0; i < NUM_DIRECTIONS; i++)
+ {
+ int xx = x + xy[i][0];
+ int yy = y + xy[i][1];
+
+ if (last_x == xx && last_y == yy && IN_LEV_FIELD(last_x, last_y) &&
+ IS_DC_STEELWALL_2(IntelliDrawBuffer[last_x][last_y]))
+ {
+ int dir = MV_DIR_FROM_BIT(i);
+ int dir_opposite = MV_DIR_OPPOSITE(dir);
+ int last_element_old = IntelliDrawBuffer[last_x][last_y];
+ int last_direction_old = getOpenDirectionFromSteel2(last_element_old);
+ int last_direction_new = last_direction_old | dir_opposite;