/**
  * Renders the map javascript circles
  *
  * @param Ivory\GoogleMapBundle\Model\Map $map
  * @return string HTML output
  */
 public function renderCircles(Map $map)
 {
     $html = array();
     foreach ($map->getCircles() as $circle) {
         $html[] = $this->circleHelper->render($circle, $map);
     }
     return implode('', $html);
 }