1 import java.awt.Color;
2 import java.awt.Graphics;
3
4 import javax.swing.JFrame;
5 import javax.swing.JPanel;
6
7
8 public class SimpleAnimation {
9
10 /**
11 * @param args
12 */
13 int x=0,y=0;
14 public static void main(String[] args) {
15 // TODO Auto-generated method stub
16 SimpleAnimation gui=new SimpleAnimation();
17 gui.test();
18 }
19 public void test() {
20 JFrame frame=new JFrame();
21 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
22
23 MyDrawPanel drawPanel=new MyDrawPanel();
24
25 frame.getContentPane().add(drawPanel);
26 frame.setSize(500, 500);
27 frame.setVisible(true);
28
29 for (int i = 0; i < frame.getHeight()-60; i++) {
30 x++;
31 y++;
32 drawPanel.repaint();
33 try {
34 Thread.sleep((int)(Math.random()*140));
35 } catch (Exception ex) {
36 // TODO: handle exception
37 ex.printStackTrace();
38 }
39 }
40 }
41 class MyDrawPanel extends JPanel{
42 public void paintComponent(Graphics g) {
43 int red=(int)(Math.random()*255);
44 int green=(int)(Math.random()*255);
45 int blue=(int)(Math.random()*255);
46 g.setColor(Color.red);
47 g.fillRect(0, 0, this.getWidth(), this.getHeight());
48 g.setColor(new Color(red,green,blue));
49 g.fillOval(x, y, 40, 40);
50 }
51 }
52
53 }
