使用java实现圆形运动

 
 1 package com.neuedu.test;

import java.awt.Graphics;
import java.awt.Image;

import com.neuedu.constant.Constant;
import com.neuedu.util.GameUtill;
import com.neuedu.util.MyFrame;

public class Round extends MyFrame {

package com.neuedu.util;

import java.awt.Color;
import java.awt.Component;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import com.neuedu.constant.Constant;

public abstract class MyFrame extends Frame {
    public void loadFrame () {
        
        setSize(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
        setLocationRelativeTo(null);
        setTitle("窗口");
        setResizable(false);
        setVisible(true);
        addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosing(WindowEvent e) {
                // TODO Auto-generated method stub
                System.exit(0);
            }
            
        });
        new MyThread().start();
    }
        
    class MyThread extends Thread {

        @Override
        public void run() {
            while (true) {
            repaint();
            try {
                Thread.sleep(60);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            }
        }
        
    }
    Image offScreenImage = null ;//创建双缓冲，因为repaint太快
    @Override
    public void update(Graphics g) {
    if(offScreenImage == null) {
    offScreenImage = this.createImage(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
    }
    Graphics gOffScreen = offScreenImage.getGraphics();
    Color c = gOffScreen.getColor();
    gOffScreen.setColor(Color.WHITE);
    gOffScreen.fillRect(0,0,Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
    gOffScreen.setColor(c);
    paint(gOffScreen);
    g.drawImage(offScreenImage, 0, 0, null);
    }
}

    /**
     * @param args
     */
    Image snow = GameUtill.getImage("com/neuedu/img/star.png");
    int y = 250;
    int x = 700;19     double degree = Math.PI/6;
    double speed= 0.1;
    @Override
    public void paint(Graphics g) {
        
        // TODO Auto-generated method stub
        g.drawImage(snow,x,y,50,50,null);
        x +=  25* Math.cos(degree);
        y +=  25* Math.sin(degree);
        degree += speed;
        
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new Round().loadFrame();
    }

}

package com.neuedu.util;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;

import javax.imageio.ImageIO;

public class GameUtill {
      public static Image getImage (String imgPath) {
        URL u = GameUtill.class.getClassLoader().getResource(imgPath);
          BufferedImage img = null;
          try {
            img = ImageIO.read(u);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
          return img;
          
      }
}