使用mvc设计模式调用repaint（）和paintComponent（）方法时出现问题

I'm creating a small game, you click buttons (up, down, left and right) to control a cat (represented by a rectangle) to chase a mouse (represented by another rectangle). Lame I know... anyway I'm using the mvc design pattern and I am having problems calling the repaint method from button listeners in the controller on the panel where the two rectangles are to be 'painted'. They paint successfully the first time but not any further time.I'm creating a small game, you click buttons (u