rolling.java

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import java.applet.*;
import java.awt.*;
import java.applet.AudioClip;
public class Rolling extends Applet implements Runnable {
	Image buffer;
	Graphics gContext;
	Thread animate;
	String s="文字动画";
	int w,h,x,y,size=12;
	AudioClip current;
	
	public void init() {
		w=getWidth();
		h=getHeight();
		buffer=createImage(w,h);
		gContext=buffer.getGraphics();
		gContext.setColor(Color.blue);
		current=getAudioClip(getCodeBase(),"a.midi");
		current.play();
	}
	
	public void start() {
		if (animate==null) {
			animate=new Thread(this);
			animate.start();
		}
	}
	
	public void stop() {
		if (animate!=null) {
			animate=null;
		}
	}
	
	public void run() {
		while(true) {
			x=(w-s.length()*size)/2;
			y=(h+size)/2;
			gContext.setFont(new Font("宋体",Font.PLAIN,size));
			gContext.drawString(s,x,y);
			repaint();
			try {
				animate.sleep(50);
			} catch (InterruptedException e){}
			gContext.clearRect(0,0,w,h);
			if (++size>40)
				size=12;
		}
	}
	
	public void paint(Graphics g) {
		g.drawImage(buffer,0,0,this);
	}
	
	public void update(Graphics g) {
		paint(g);
	}
}