ball.java~2~

JAVA编写的BounceTest程序 供编程爱好者学习参考之用

package bouncetest;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class Ball extends Thread {
  public Ball(JPanel b, Color c) { box = b; color = c; }

     public void draw()
     {  Graphics g = box.getGraphics();
        g.setColor(color);
        g.fillOval(x, y, XSIZE, YSIZE);
        g.dispose();
     }

     public void move()
     {  if (!box.isVisible()) return;
        Graphics g = box.getGraphics();
        g.setXORMode(box.getBackground());
        g.setColor(color);
        g.fillOval(x, y, XSIZE, YSIZE);
        x += dx;
        y += dy;
        Dimension d = box.getSize();
        if (x < 0)
        { x = 0; dx = -dx; }
        if (x + XSIZE >= d.width)
        { x = d.width - XSIZE; dx = -dx; }
        if (y < 0)
        { y = 0; dy = -dy; }
        if (y + YSIZE >= d.height)
        { y = d.height - YSIZE; dy = -dy; }
        g.fillOval(x, y, XSIZE, YSIZE);
        g.dispose();
     }

     public void run()
     {  try
        {  draw();
           for (int i = 1; i <= 1000; i++)
           {  move();
              sleep(5);
           }
        }
        catch(InterruptedException e) {}
     }

     private JPanel box;
     private static final int XSIZE = 10;
     private static final int YSIZE = 10;
     private int x = 0;
     private int y = 0;
     private int dx = 2;
     private int dy = 2;
     private Color color;


}