boy.java

跳动的小人

import java.awt.*;
import java.applet.*;
		
public class boy extends Applet implements Runnable 
{
	Image offscreenImage;//add a imageobject
	Graphics offscreenGraphics;// ADD A  GRAPHICS OBJECT
	Thread runner;
	int i=0;
	public void start()
	{
		setBackground(Color.blue);//
		offscreenImage=createImage(this.size().width,this.size().height);//
		offscreenGraphics=offscreenImage.getGraphics();//
		
		if (runner==null)
		{runner=new Thread(this);
		 runner.start(); 
	     }
	} 
    public void stop()
	{
	if (runner!=null)
	{runner.stop();
	 runner=null;
	 }
	}
	public void mainpart()
	{offscreenGraphics.setColor(Color.black);
	offscreenGraphics.fillOval(10,10,60,60);
	offscreenGraphics.setColor(Color.white);
	offscreenGraphics.fillOval(25,30,8,8);
	offscreenGraphics.fillOval(50,30,8,8);
	offscreenGraphics.drawLine(40,35,40,50);
	offscreenGraphics.drawLine(40,70,40,170);}
	public void paint(Graphics g)
	{
	
	switch (i)
		{
	case 1:
	offscreenGraphics.clearRect(0,0,this.size().width,this.size().height);
	mainpart();
	offscreenGraphics.drawLine(0,110,80,110);
	offscreenGraphics.drawLine (0,230,40,170);
	offscreenGraphics.drawLine(40,170,80,230);
	//g.drawImage(offscreenImage,0,0,this);
	break;
	case 0:
offscreenGraphics.clearRect(0,0,this.size().width,this.size().height);
mainpart();	
offscreenGraphics.drawLine(0,65,40,110);
	offscreenGraphics.drawLine (40,110,80,65);
	offscreenGraphics.drawLine(0,210,40,170);
	offscreenGraphics.drawLine(40,170,80,210);
	//g.drawImage(offscreenImage,0,0,this);
	break;
	case 2:
	offscreenGraphics.clearRect(0,0,this.size().width,this.size().height);
	mainpart();
	offscreenGraphics.drawLine(0,135,40,110);
	offscreenGraphics.drawLine (40,110,80,135);
	offscreenGraphics.drawLine(0,220,40,170);
	offscreenGraphics.drawLine(40,170,80,220);
	//g.drawImage(offscreenImage,0,0,this);
	break;
	case 3:
	offscreenGraphics.clearRect(0,0,this.size().width,this.size().height);
	mainpart();
	offscreenGraphics.drawLine(15,170,40,110);
	offscreenGraphics.drawLine (40,110,65,170);
	offscreenGraphics.drawLine (35,250,40,170);
	offscreenGraphics.drawLine(40,170,45,250);
	break;
	default:System.out .println("error");
	}
	g.drawImage(offscreenImage,0,0,this);
	}
	public void update(Graphics g)
	{
	setBackground(Color.blue);//
	paint(g);	//不清除屏幕
	}
	public void run()
	{
		while (runner!=null){//begin of while
	//setBackground(Color.blue);
	for (i=0;i<4;i+=1)
	{ repaint();
	  try
	  {Thread.sleep(100);}
	  catch(InterruptedException e)
	  {}
	}
	for (i=3;i>=0;i-=1)
	{repaint();
	 try{Thread.sleep(100);}
	 catch(InterruptedException e){}
	 }
		}//end of while
	
    	
	}
	
}