code: function(container) {
  		var top = container.el.offsetTop;
  		var bottom = top+container.el.offsetHeight;
  	
  		var left = container.el.offsetLeft;
  		var right = left+container.el.offsetWidth;
  	
  		return [
  	    	{x : left, y: top},
  	    	{x : left, y: bottom},
  	    	{x : right, y: top},
  	    	{x : right, y: bottom}
  		];
     }
docs: getContainerCorners