/**
* Sets the marker shadow.
*
* Available prototypes:
* - function setShadow(Ivory\GoogleMap\Overlays\MarkerImage $markerImage = null)
* - function setShadow(string $url = null)
*
* @throws \Ivory\GoogleMap\Exception\OverlayException If the marker shadow is not valid.
*/
public function setShadow()
{
$args = func_get_args();
if (isset($args[0]) && $args[0] instanceof MarkerImage) {
if ($args[0]->getUrl() === null) {
throw OverlayException::invalidMarkerShadowUrl();
}
$this->shadow = $args[0];
} elseif (isset($args[0]) && is_string($args[0])) {
if ($this->shadow === null) {
$this->shadow = new MarkerImage();
}
$this->shadow->setUrl($args[0]);
} elseif (!isset($args[0])) {
$this->shadow = null;
} else {
throw OverlayException::invalidMarkerShadow();
}
}