为什么我的飞机没有出现移动呢?
package com.bjxt.plane;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class MyPlaneGame extends Frame {
public static final int GAME_WIDTH=500;
public static final int GAME_HEIGHT=500;
Image plane=GameUtil.getImage("images/plane.png");
Image bg=GameUtil.getImage("images/bg.jpg");
int count =0;
int planex=100;
@Override
public void paint(Graphics g) {
System.out.println("绘制窗口:"+count);
count++;
g.drawImage(plane,planex,100,22,33,null);
g.drawImage(bg,0,0,500,500,null);
planex+=1;
}
public void launchFrame(){
this.setTitle("飞机大战.第一阶段");
setVisible(true);
setSize(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
setLocation(300,300);
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
new PaintThread().start();
}
class PaintThread extends Thread{
@Override
public void run() {
while(true){
repaint();
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
private Image offScreenImage = null;
public void update(Graphics g){
if(offScreenImage==null){
offScreenImage=this.createImage(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
Graphics goff=offScreenImage.getGraphics();
paint(goff);
g.drawImage(offScreenImage,0,0,null);
}
}
public static void main(String[] args) {
MyPlaneGame planegame=new MyPlaneGame();
planegame.launchFrame();
}
}