public Map<String, Object> build(MouseEvent evt, Map<String, Object> data) { AuUtility.setEssential(data, "pageX", evt.getPageX()); AuUtility.setEssential(data, "pageY", evt.getPageY()); AuUtility.setEssential(data, "x", evt.getX()); AuUtility.setEssential(data, "y", evt.getY()); AuUtility.setOptional(data, "area", evt.getArea());