code: protected void saveTile(FileWriting file, Tile tile) throws IOException
      {
          file.writeInteger(tile.getSheet().intValue());
          file.writeInteger(tile.getNumber());
          file.writeInteger(tile.getInTileX() % BLOC_SIZE);
          file.writeInteger(tile.getInTileY());
      }
docs: Save tile. Data are saved this way:
  
  <pre>
  (integer) sheet number
  (integer) index number inside sheet
  (integer) tile location x % MapTile.BLOC_SIZE
  (integer tile location y
  </pre>
  
  @param file The file writer reference.
  @param tile The tile to save.
  @throws IOException If error on writing.