使用java实现圆形运动

 
 1 package com.neuedu.test;
 2
 3 import java.awt.Graphics;
 4 import java.awt.Image;
 5
 6 import com.neuedu.constant.Constant;
 7 import com.neuedu.util.GameUtill;
 8 import com.neuedu.util.MyFrame;
 9
10 public class Round extends MyFrame {
11

 1 package com.neuedu.util;
 2
 3 import java.awt.Color;
 4 import java.awt.Component;
 5 import java.awt.Frame;
 6 import java.awt.Graphics;
 7 import java.awt.Image;
 8 import java.awt.event.WindowAdapter;
 9 import java.awt.event.WindowEvent;
10
11 import com.neuedu.constant.Constant;
12
13 public abstract class MyFrame extends Frame {
14     public void loadFrame () {
15
16         setSize(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
17         setLocationRelativeTo(null);
18         setTitle("窗口");
19         setResizable(false);
20         setVisible(true);
21         addWindowListener(new WindowAdapter() {
22
23             @Override
24             public void windowClosing(WindowEvent e) {
25                 // TODO Auto-generated method stub
26                 System.exit(0);
27             }
28
29         });
30         new MyThread().start();
31     }
32
33     class MyThread extends Thread {
34
35         @Override
36         public void run() {
37             while (true) {
38             repaint();
39             try {
40                 Thread.sleep(60);
41             } catch (InterruptedException e) {
42                 // TODO Auto-generated catch block
43                 e.printStackTrace();
44             }
45             }
46         }
47
48     }
49     Image offScreenImage = null ;//创建双缓冲，因为repaint太快
50     @Override
51     public void update(Graphics g) {
52     if(offScreenImage == null) {
53     offScreenImage = this.createImage(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
54     }
55     Graphics gOffScreen = offScreenImage.getGraphics();
56     Color c = gOffScreen.getColor();
57     gOffScreen.setColor(Color.WHITE);
58     gOffScreen.fillRect(0,0,Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
59     gOffScreen.setColor(c);
60     paint(gOffScreen);
61     g.drawImage(offScreenImage, 0, 0, null);
62     }
63 }

12     /**
13      * @param args
14      */
15     Image snow = GameUtill.getImage("com/neuedu/img/star.png");
16     int y = 250;
17     int x = 700;19     double degree = Math.PI/6;
20     double speed= 0.1;
21     @Override
22     public void paint(Graphics g) {
23
24         // TODO Auto-generated method stub
25         g.drawImage(snow,x,y,50,50,null);
26         x +=  25* Math.cos(degree);
27         y +=  25* Math.sin(degree);
28         degree += speed;
29
30     }
31     public static void main(String[] args) {
32         // TODO Auto-generated method stub
33         new Round().loadFrame();
34     }
35
36 }

 1 package com.neuedu.util;
 2
 3 import java.awt.Image;
 4 import java.awt.image.BufferedImage;
 5 import java.io.IOException;
 6 import java.net.URL;
 7
 8 import javax.imageio.ImageIO;
 9
10 public class GameUtill {
11       public static Image getImage (String imgPath) {
12         URL u = GameUtill.class.getClassLoader().getResource(imgPath);
13           BufferedImage img = null;
14           try {
15             img = ImageIO.read(u);
16         } catch (IOException e) {
17             // TODO Auto-generated catch block
18             e.printStackTrace();
19         }
20           return img;
21
22       }
23 }