动态图形编程（动画） [英] Dynamic graphic programming (Animation)

问题描述

我试图code一个简单的动画就像一个移动的圆圈。我一直在使用的getGraphics（）试图并与工作，但它不是动态的，它画了只是一个时间

I am trying to code a simple animation like a moving circle. I have tried using getGraphics() and work with that but it's not dynamic and it's painted for just one time

所以，请帮助我，指导我code动态图形程序。

So please help me and guide me to code a dynamic graphic program.

我的意思是比如定义一个函数，并在每次开机时调用的时候，它吸引的标签上一条线。

I mean for example defining a function and every time when it called, it draws a line on a label.

推荐答案

下面是如何使越来越多的矩形：

Here is how to make a growing rectangle:

public class MovingRectangle extends JPanel {
    private Timer timer = new Timer(500, new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            rectWidth += 100;
            repaint();
        }
    };

    private int rectWidth = 100;

    public void paintComponent(Graphics g) {
         super.paintComponent(g);
         g.drawRect(0, 0, 100. rectWidth);
    }

    public void start() {
        timer.start();
    }

    public void stop() {
        timer.stop();
    }

    public void reset() {
        rectWidth = 100;
        repaint();
    }
}

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