protected function _run()
 {
     $this->_tile = $this->_tileSource->getTile($this->_tileNumbers['x'], $this->_tileNumbers['y'], $this->_worldMap->getZoom());
     $this->_isLoaded = true;
 }
 /**
  * it starts loading the tile image
  *
  */
 public function start()
 {
     $this->_tile = $this->_tileSource->getTile($this->_tileData['x'], $this->_tileData['y'], $this->_tileData['zoom']);
     $this->_isLoaded = true;
 }