Get mouse position

getMousePositions.js

/**
 * Get mouse position
 *
 * @param  obj 		event
 * @return obj   { x, y }
 * @see from http://www.quirksmode.org/js/events_properties.html#position
 */
export default function getMousePositions(event) {
	let positionX = 0;
	let positionY = 0;

	if (!event) event = window.event;

	if (event.pageX || event.pageY) {
		positionX = event.pageX;
		positionY = event.pageY;
	}

	else if (event.clientX || event.clientY) {
		positionX = event.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
		positionY = event.clientY + document.body.scrollTop + document.documentElement.scrollTop;
	}

	return { x: positionX, y: positionY }
};