animation.java

java applet实用编程教程第一部分,非常好的applet源代码

import java.awt.*;
import java.applet.Applet;
import java.lang.Thread;

public class Animation extends Applet
{
	Animator a=null;
	Thread aThread;
	
	public void init()
	{
		resize(300,300);
		a=new Animator(this,0,0);
		aThread=new Thread(a);
		aThread.start();
	}
	
	public void start()
	{
		aThread.resume();
	}
	
	public void stop()
	{
		aThread.suspend();
	}
}

class Animator implements Runnable
{
	Image im[];
	Applet applet;
	int n=1;
	Graphics g;
	int cx,cy;
	MediaTracker tracker;
	
	public Animator(Applet app,int _cx,int _cy)
	{
		applet=app;
		cx=_cx;
		cy=_cy;
		g=applet.getGraphics();
		tracker=new MediaTracker(applet);
		im=new Image[9];
		for(int i=1;i<9;i++)
		{
			im[i]=applet.getImage(applet.getCodeBase(),i+".bmp");
			tracker.addImage(im[i],i);
		}
	}
	
	public void run()
	{
		Label lab=new Label("Loading images...",Label.LEFT);
		applet.add(lab,0);
		try { tracker.waitForAll(); }
		catch(Exception e) { }
		applet.remove(lab);
		while(true)
		{
			if(n>8) n=1;
			g.drawImage(im[n],cx,cy,applet);
			n++;
			try { Thread.sleep(200); }
			catch(Exception e) { }
		}
	}
}