function defaultGetZrXY(el, e, out) {
	        // This well-known method below does not support css transform.
	        var box = getBoundingClientRect(el);
	        out.zrX = e.clientX - box.left;
	        out.zrY = e.clientY - box.top;
	    }
Mouse move handler
@inner
@param {Event} event