Fix pattern center check

Author: TheApplePieGod

engine/src/main/battlecode/world/GameWorld.java

@@ -576,12 +576,12 @@ public int getTowerPattern(UnitType towerType) {
         return this.patternArray[towerTypeToPatternIndex(towerType)];
     }
 
-    public boolean isValidPatternCenter(MapLocation loc) {
+    public boolean isValidPatternCenter(MapLocation loc, boolean isTower) {
         return (!(loc.x < GameConstants.PATTERN_SIZE / 2
               || loc.y < GameConstants.PATTERN_SIZE / 2
               || loc.x >= gameMap.getWidth() - (GameConstants.PATTERN_SIZE - 1) / 2
               || loc.y >= gameMap.getHeight() - (GameConstants.PATTERN_SIZE - 1) / 2
-        )) && areaIsPaintable(loc) ;
+        )) && (isTower || areaIsPaintable(loc)) ;
     }
 
     // checks that location has no walls/ruins in the surrounding 5x5 area

engine/src/main/battlecode/world/RobotControllerImpl.java

@@ -583,7 +583,7 @@ private void assertCanMarkTowerPattern(UnitType type, MapLocation loc) throws Ga
                             + ") because the center is not a ruin");
         }
 
-        if (!this.gameWorld.isValidPatternCenter(loc)) {
+        if (!this.gameWorld.isValidPatternCenter(loc, true)) {
             throw new GameActionException(CANT_DO_THAT,
                     "Cannot mark tower pattern centered at (" + loc.x + ", " + loc.y
                             + ") because it is too close to the edge of the map");
@@ -678,10 +678,10 @@ private void assertCanMarkResourcePattern(MapLocation loc) throws GameActionExce
         assertIsRobotType(this.robot.getType());
         assertCanActLocation(loc, GameConstants.RESOURCE_PATTERN_RADIUS_SQUARED);
 
-        if (!this.gameWorld.isValidPatternCenter(loc)) {
+        if (!this.gameWorld.isValidPatternCenter(loc, false)) {
             throw new GameActionException(CANT_DO_THAT,
                     "Cannot mark resource pattern centered at (" + loc.x + ", " + loc.y
-                            + ") because it is too close to the edge of the map");
+                            + ") because it is blocked or too close to the edge of the map");
         }
 
         if (this.robot.getPaint() < GameConstants.MARK_PATTERN_PAINT_COST){
@@ -750,7 +750,7 @@ private void assertCanCompleteTowerPattern(UnitType type, MapLocation loc) throw
                     + ") because the team does not have enough money!"); 
         }
 
-        if (!this.gameWorld.isValidPatternCenter(loc)) {
+        if (!this.gameWorld.isValidPatternCenter(loc, true)) {
             throw new GameActionException(CANT_DO_THAT,
                     "Cannot complete tower pattern centered at (" + loc.x + ", " + loc.y
                             + ") because it is too close to the edge of the map");
@@ -802,10 +802,10 @@ private void assertCanCompleteResourcePattern(MapLocation loc) throws GameAction
         assertIsRobotType(this.robot.getType());
         assertCanActLocation(loc, GameConstants.RESOURCE_PATTERN_RADIUS_SQUARED);
 
-        if (!this.gameWorld.isValidPatternCenter(loc)) {
+        if (!this.gameWorld.isValidPatternCenter(loc, false)) {
             throw new GameActionException(CANT_DO_THAT,
                     "Cannot complete resource pattern centered at (" + loc.x + ", " + loc.y
-                            + ") because it is too close to the edge of the map");
+                            + ") because it is blocked or too close to the edge of the map");
         }
 
         boolean valid = this.gameWorld.checkResourcePattern(this.robot.getTeam(), loc);