Java台球游戏2

效果：测试窗口物体沿着任意角度飞行。
/**
* 测试窗口物体沿着任意角度飞行。
* 最后，实现一个小的台球游戏。
* @author Administrator
*
*/

public class GameFrame02 extends Frame {
Image img = GameUtil.getImage(“images/sun.jpg”);

/**
 * 加载窗口
 */
public void launchFrame(){
    setSize(500, 500);
    setLocation(100, 100);
    setVisible(true);

    new PaintThread().start();  //启动重画线程

    addWindowListener(new WindowAdapter() {
        @Override
        public void windowClosing(WindowEvent e) {
            System.exit(0);
        }

    });
}

private double x=100,y=100;
private double degree=3.14/3;    //[0,2pi]
private double speed = 10;
public void paint(Graphics g) {
    g.drawImage(img, (int)x, (int)y, null);

    if(speed>0){
        speed -=0.05;
    }else{
        speed = 0;
    }

    x += speed*Math.cos(degree);
    y += speed*Math.sin(degree);

    if(y>500-30||y<30){
        degree = -degree;
    }

    if(x<0||x>500-30){
        degree = Math.PI-degree;
    }

}
/**
 * 定义一个重画窗口的线程类，是一个内部类
 * @author Administrator
 */

class PaintThread extends Thread {

    public void run(){
        while(true){
            repaint();
            try {
                Thread.sleep(40); //1s = 1000ms
            } catch (InterruptedException e) {
                e.printStackTrace();
            }   
        }
    }

}
public static void main(String[] args){
    GameFrame02 gf=new GameFrame02();
    gf.launchFrame();
}

}