code: function MouseMoveEvent(mouse) {
  	
  	MouseEvent.call(this, 'mousemove', mouse);
  	
  	this.movementX = mouse.x - prevX;
  	this.movementY = mouse.x - prevY;
  	
  	prevX = mouse.x;
  	prevY = mouse.y;
  	
  }
docs: eslint-disable-next-line no-unused-vars