code: private boolean isDownPosition(HumanInputEvent<?> event) {
  		if (clickedPosition != null) {
  			Coordinate location = getLocation(event, RenderSpace.SCREEN);
  			if (MathService.distance(clickedPosition, location) < clickDelta) {
  				return true;
  			}
  		}
  		return false;
  	}
docs: Is the event at the same location as the "down" event?
  
  @param event The event to check.
  @return true or false.