+ 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;
+
+ last_element_new = getSteel2FromOpenDirection(last_direction_new);
+
+ direction |= dir;
+ }
+ }
+
+ new_element = getSteel2FromOpenDirectionNotEmpty(direction, new_element);
+
+ if (last_element_new != EL_UNDEFINED)
+ MergeAndCloseNeighbourElements(x, y, &new_element,
+ last_x, last_y, &last_element_new,
+ getClosedSteel2, change_level);
+ }
+ else if (IS_SP_CHIP(new_element))
+ {
+ int last_element_new = EL_UNDEFINED;
+ int direction = MV_NONE;
+ int i;
+
+ /* (do not keep existing directions, regardless of kind of 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_SP_CHIP(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 = getOpenDirectionFromChip(last_element_old);
+ int last_direction_new = last_direction_old | dir_opposite;
+
+ if (last_direction_old == MV_NONE)
+ {
+ last_element_new = getChipFromOpenDirection(last_direction_new);
+ direction |= dir;
+ }
+ else if (last_direction_old & (dir | dir_opposite))
+ {
+ direction |= MV_DIR_OPPOSITE(last_direction_old);
+ }
+ else
+ {
+ direction |= MV_DIR_OPPOSITE(dir);
+ }
+ }
+ }
+
+ new_element = getChipFromOpenDirectionNotEmpty(direction, new_element);
+
+ if (last_element_new != EL_UNDEFINED)
+ MergeAndCloseNeighbourElements(x, y, &new_element,
+ last_x, last_y, &last_element_new,
+ getClosedChip, change_level);
+ }
+ else if (IS_SP_HARDWARE_BASE(new_element))
+ {
+ int nr = GetSimpleRandom(6);
+
+ new_element = (nr == 0 ? EL_SP_HARDWARE_BASE_1 :
+ nr == 1 ? EL_SP_HARDWARE_BASE_2 :
+ nr == 2 ? EL_SP_HARDWARE_BASE_3 :
+ nr == 3 ? EL_SP_HARDWARE_BASE_4 :
+ nr == 4 ? EL_SP_HARDWARE_BASE_5 : EL_SP_HARDWARE_BASE_6);
+ }
+ else if (new_element == EL_SP_HARDWARE_GREEN ||
+ new_element == EL_SP_HARDWARE_BLUE ||
+ new_element == EL_SP_HARDWARE_RED)
+ {
+ int nr = GetSimpleRandom(3);
+
+ new_element = (nr == 0 ? EL_SP_HARDWARE_GREEN :
+ nr == 1 ? EL_SP_HARDWARE_BLUE : EL_SP_HARDWARE_RED);
+ }
+ else if (IS_GROUP_ELEMENT(new_element))
+ {
+ boolean connected_drawing = FALSE;
+ int i;
+
+ 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_IN_GROUP_EL(IntelliDrawBuffer[last_x][last_y], new_element))
+ connected_drawing = TRUE;
+ }
+
+ if (!connected_drawing)
+ ResolveGroupElement(new_element);
+
+ new_element = GetElementFromGroupElement(new_element);
+ }
+ else if (IS_BELT_SWITCH(old_element))
+ {
+ int belt_nr = getBeltNrFromBeltSwitchElement(old_element);
+ int belt_dir = getBeltDirFromBeltSwitchElement(old_element);
+
+ belt_dir = (belt_dir == MV_LEFT ? MV_NONE :
+ belt_dir == MV_NONE ? MV_RIGHT : MV_LEFT);
+
+ new_element = getBeltSwitchElementFromBeltNrAndBeltDir(belt_nr, belt_dir);
+ }
+ else
+ {
+ static int swappable_elements[][2] =
+ {
+ { EL_EXIT_CLOSED, EL_EXIT_OPEN },
+ { EL_DYNAMITE, EL_DYNAMITE_ACTIVE },
+ { EL_EM_DYNAMITE, EL_EM_DYNAMITE_ACTIVE },
+ { EL_QUICKSAND_EMPTY, EL_QUICKSAND_FULL },
+ { EL_EMERALD, EL_WALL_EMERALD },
+ { EL_EMERALD_YELLOW, EL_WALL_EMERALD_YELLOW },
+ { EL_EMERALD_RED, EL_WALL_EMERALD_RED },
+ { EL_EMERALD_PURPLE, EL_WALL_EMERALD_PURPLE },
+ { EL_DIAMOND, EL_WALL_DIAMOND },
+ { EL_BD_DIAMOND, EL_WALL_BD_DIAMOND },
+ { EL_GATE_1, EL_GATE_1_GRAY },
+ { EL_GATE_2, EL_GATE_2_GRAY },
+ { EL_GATE_3, EL_GATE_3_GRAY },
+ { EL_GATE_4, EL_GATE_4_GRAY },
+ { EL_EM_GATE_1, EL_EM_GATE_1_GRAY },
+ { EL_EM_GATE_2, EL_EM_GATE_2_GRAY },
+ { EL_EM_GATE_3, EL_EM_GATE_3_GRAY },
+ { EL_EM_GATE_4, EL_EM_GATE_4_GRAY },
+ { EL_EMC_GATE_5, EL_EMC_GATE_5_GRAY },
+ { EL_EMC_GATE_6, EL_EMC_GATE_6_GRAY },
+ { EL_EMC_GATE_7, EL_EMC_GATE_7_GRAY },
+ { EL_EMC_GATE_8, EL_EMC_GATE_8_GRAY },
+ { EL_DC_GATE_WHITE, EL_DC_GATE_WHITE_GRAY },
+ { EL_TIME_ORB_EMPTY, EL_TIME_ORB_FULL },
+ { EL_LAMP, EL_LAMP_ACTIVE },
+ { EL_SOKOBAN_FIELD_EMPTY, EL_SOKOBAN_FIELD_FULL },
+ { EL_SP_BASE, EL_SP_BUGGY_BASE },
+ { EL_PEARL, EL_WALL_PEARL },
+ { EL_CRYSTAL, EL_WALL_CRYSTAL },
+ { EL_TIMEGATE_CLOSED, EL_TIMEGATE_OPEN },
+ { EL_SWITCHGATE_CLOSED, EL_SWITCHGATE_OPEN },
+ { EL_SWITCHGATE_SWITCH_UP, EL_SWITCHGATE_SWITCH_DOWN },
+ { EL_DC_SWITCHGATE_SWITCH_UP, EL_DC_SWITCHGATE_SWITCH_DOWN },
+ { EL_LIGHT_SWITCH, EL_LIGHT_SWITCH_ACTIVE },
+ { EL_LANDMINE, EL_DC_LANDMINE },
+ { EL_SHIELD_NORMAL, EL_SHIELD_DEADLY },
+ { EL_STEEL_EXIT_CLOSED, EL_STEEL_EXIT_OPEN },
+ { EL_EM_EXIT_CLOSED, EL_EM_EXIT_OPEN },
+ { EL_EM_STEEL_EXIT_CLOSED, EL_EM_STEEL_EXIT_OPEN },
+ { EL_QUICKSAND_FAST_EMPTY, EL_QUICKSAND_FAST_FULL },
+
+ { -1, -1 },
+ };
+ static int rotatable_elements[][4] =
+ {
+ {
+ EL_BUG_UP,
+ EL_BUG_RIGHT,
+ EL_BUG_DOWN,
+ EL_BUG_LEFT
+ },
+
+ {
+ EL_SPACESHIP_UP,
+ EL_SPACESHIP_RIGHT,
+ EL_SPACESHIP_DOWN,
+ EL_SPACESHIP_LEFT
+ },
+
+ {
+ EL_BD_BUTTERFLY_UP,
+ EL_BD_BUTTERFLY_RIGHT,
+ EL_BD_BUTTERFLY_DOWN,
+ EL_BD_BUTTERFLY_LEFT
+ },
+
+ {
+ EL_BD_FIREFLY_UP,
+ EL_BD_FIREFLY_RIGHT,
+ EL_BD_FIREFLY_DOWN,
+ EL_BD_FIREFLY_LEFT
+ },
+
+ {
+ EL_PACMAN_UP,
+ EL_PACMAN_RIGHT,
+ EL_PACMAN_DOWN,
+ EL_PACMAN_LEFT
+ },
+
+ {
+ EL_YAMYAM_UP,
+ EL_YAMYAM_RIGHT,
+ EL_YAMYAM_DOWN,
+ EL_YAMYAM_LEFT
+ },
+
+ {
+ EL_ARROW_UP,
+ EL_ARROW_RIGHT,
+ EL_ARROW_DOWN,
+ EL_ARROW_LEFT
+ },
+
+ {
+ EL_SP_PORT_UP,
+ EL_SP_PORT_RIGHT,
+ EL_SP_PORT_DOWN,
+ EL_SP_PORT_LEFT
+ },
+
+ {
+ EL_SP_GRAVITY_PORT_UP,
+ EL_SP_GRAVITY_PORT_RIGHT,
+ EL_SP_GRAVITY_PORT_DOWN,
+ EL_SP_GRAVITY_PORT_LEFT
+ },
+
+ {
+ EL_SP_GRAVITY_ON_PORT_UP,
+ EL_SP_GRAVITY_ON_PORT_RIGHT,
+ EL_SP_GRAVITY_ON_PORT_DOWN,
+ EL_SP_GRAVITY_ON_PORT_LEFT
+ },
+
+ {
+ EL_SP_GRAVITY_OFF_PORT_UP,
+ EL_SP_GRAVITY_OFF_PORT_RIGHT,
+ EL_SP_GRAVITY_OFF_PORT_DOWN,
+ EL_SP_GRAVITY_OFF_PORT_LEFT
+ },
+
+ {
+ EL_MOLE_UP,
+ EL_MOLE_RIGHT,
+ EL_MOLE_DOWN,
+ EL_MOLE_LEFT
+ },