/**
* Sets a margin for the watermark. Useful if you're using positioning ala CSS.
*
* @param mixed $x Can be just x position or an array containing both params.
* @param int $y Y position.
* @return Watermark
*/
public function setMargin($x, $y = null)
{
$this->margin = Normalize::margin($x, $y);
return $this;
}
