name2.java

实现名字的旋转的applet

import java.awt.*;
import java.applet.*;

public class name2 extends java.applet.Applet implements Runnable{
         int width=400;
         int height=200;
         int r=60;    //radius 
         int d;        //offset
         double alfa=-0.5;//rotating angle
         double ratio;
         Thread runner;
         Image offscreenImage;
         Graphics offscreenG;

       public void init(){
             offscreenImage = createImage(width,height);
             offscreenG = offscreenImage.getGraphics();
       }
       
       public void start(){
             if(runner == null){
                 runner = new Thread(this);
                 runner.start();
             }
       }

       public void stop(){
             if (runner != null){
                  runner.stop();
                  runner = null;
             }
       }

       public void run(){
           while(true){
               alfa=alfa+0.5;
               ratio=1-0.5*Math.sin(0.5*alfa*Math.PI/180);
               d=(int)Math.ceil(r*Math.sin(alfa*Math.PI/180));
               repaint();
               try{
                    Thread.sleep(3);
               }catch(InterruptedException e){}
            if (alfa>360) alfa=0;
            }
       }

       public void update(Graphics g){
           paint(g);
       }

       public void paint(Graphics g){

           offscreenG.setColor(Color.green);
           offscreenG.fillRect(0,0,width,height);
           offscreenG.setColor(Color.black);

           offscreenG.drawLine(
               (int)Math.ceil(-80*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(52*ratio),
               (int)Math.ceil(-70*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(72*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-80*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(80*ratio),
               (int)Math.ceil(-70*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(100*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-80*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(145*ratio),
               (int)Math.ceil(-65*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(110*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(52*ratio),
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(62*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(65*ratio),
               (int)Math.ceil(-40*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(70*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(65*ratio),
               (int)Math.ceil(-30*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(70*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(75*ratio),
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(75*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(90*ratio),
               (int)Math.ceil(-40*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(80*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-30*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(80*ratio),
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(90*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-35*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(65*ratio),
               (int)Math.ceil(-35*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(95*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(100*ratio),
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(100*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(120*ratio),
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(120*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(140*ratio),
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(140*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(100*ratio),
               (int)Math.ceil(-60*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(140*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-35*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(100*ratio),
               (int)Math.ceil(-35*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(140*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(100*ratio),
               (int)Math.ceil(-10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(140*ratio));

           offscreenG.drawLine(
               (int)Math.ceil(10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(80*ratio),
               (int)Math.ceil(25*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(80*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(100*ratio),
               (int)Math.ceil(25*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(100*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(120*ratio),
               (int)Math.ceil(25*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(120*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(80*ratio),
               (int)Math.ceil(10*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(120*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(25*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(80*ratio),
               (int)Math.ceil(25*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(120*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(35*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(55*ratio),
               (int)Math.ceil(35*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(65*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(35*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(55*ratio),
               (int)Math.ceil(75*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(55*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(75*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(55*ratio),
               (int)Math.ceil(75*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(65*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(37*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(70*ratio),
               (int)Math.ceil(73*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(70*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(39*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(95*ratio),
               (int)Math.ceil(71*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(95*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(33*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(120*ratio),
               (int)Math.ceil(77*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(120*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(55*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(70*ratio),
               (int)Math.ceil(55*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(145*ratio));
           offscreenG.drawLine(
               (int)Math.ceil(55*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(60*ratio),
               (int)Math.ceil(39*Math.cos(alfa*Math.PI/180)*ratio+d+width/2),
			   (int)Math.ceil(95*ratio));

           g.drawImage(offscreenImage,0,0,this);
        }
 }