dragon tale fix

Going outside of the map will give you an out of bounds exception. Here's the fix.

1)

Add these two methods to TileMap.

public class TileMap {
...
public int getNumRows() { return numRows; }
public int getNumCols() { return numCols; }
...
}

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2)

Change calculateCorners() in MapObject to this:

public void calculateCorners(double x, double y) {
	int leftTile = (int)(x - cwidth / 2) / tileSize;
	int rightTile = (int)(x + cwidth / 2 - 1) / tileSize;
	int topTile = (int)(y - cheight / 2) / tileSize;
	int bottomTile = (int)(y + cheight / 2 - 1) / tileSize;
	if(topTile < 0 || bottomTile >= tileMap.getNumRows() ||
		leftTile < 0 || rightTile >= tileMap.getNumCols()) {
		topLeft = topRight = bottomLeft = bottomRight = false;
		return;
	}
	int tl = tileMap.getType(topTile, leftTile);
	int tr = tileMap.getType(topTile, rightTile);
	int bl = tileMap.getType(bottomTile, leftTile);
	int br = tileMap.getType(bottomTile, rightTile);
	topLeft = tl == Tile.BLOCKED;
	topRight = tr == Tile.BLOCKED;
	bottomLeft = bl == Tile.BLOCKED;
	bottomRight = br == Tile.BLOCKED;
}