code: @Override
      public Tile getTile(int x, int y, int zoom)
      {
          return getTile(x, y, zoom, true);
      }
docs: Returns the tile that is located at the given tilePoint
  for this zoom. For example, if getMapSize() returns 10x20
  for this zoom, and the tilePoint is (3,5), then the
  appropriate tile will be located and returned.