/**
* Sets the url of the marker image.
*
* @param string $url The url of the marker image.
*
* @throws \Ivory\GoogleMap\Exception\OverlayException If the url is not valid.
*/
public function setUrl($url)
{
if (!is_string($url)) {
throw OverlayException::invalidMarkeImageUrl();
}
$this->url = $url;
}
