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发信人: andrewleu (Andy), 信区: Java
标  题: An applet written by me
发信站: BBS 水木清华站 (Fri May  1 09:12:47 1998) WWW-POST

/*
这是我写的一个小程序
类似xwindows中的Xeyes
希望你能喜欢
*/
/*
<html>
<head>
<title>The J Eyes </title>
<!created by Liu Shu, 28-Apr-1998 -->
</head>
<applet code="Jeyes.class" width=500 height=300>
</applet>
<font SIZE="-1" FACE="Arial"><a HREF="andrewleu@hotmail.com">mailto:andrewleu@hotmail.com">andrewleu@hotmail.com
</html>
**/

import java.applet.*;
import java.awt.*;
import java.lang.Math;

public class Jeyes extends Applet implements Runnable
{
    Dimension d;
    Thread motor ;
    Image offScreen;
    Graphics offScreenGraphics;
    boolean loaded ;
    int w    , h;
    int x, y;
    //mouse Position
    boolean first=true;
    int eyeX,eyeY;
    //eyeball position
    public void init(){
       d=this.size();
       w=d.width;h=d.height;
       offScreen=createImage(w,h);
       offScreenGraphics=offScreen.getGraphics();
     }
public void    paint(Graphics g)
    {
      int leftCoX,leftCoY,rightCoX,rightCoY;
      float arcLeft,arcRight;
      if (first)
       {
        g.setColor(Color.black);
        g.fillOval(20,20,w/2-40,h-40);
        g.fillOval(w/2+20,20,w/2-40,h-40);
        g.setColor(Color.white);
        g.fillOval(35,35,w/2-70,h-70);
        g.fillOval(w/2+35,35,w/2-70,h-70);// Eyes
        g.setColor(Color.black);
        g.fillOval(w/4, h/2,50,50);
        g.fillOval(3*w/4,h/2,50,50);  //Eye balls
        first=false;
        }
      else
      {
        offScreenGraphics.setColor(Color.black);
        offScreenGraphics.fillOval(20,20,w/2-40,h-40);
        offScreenGraphics.fillOval(w/2+20,20,w/2-40,h-40);
        offScreenGraphics.setColor(Color.white);
        offScreenGraphics.fillOval(35,35,w/2-70,h-70);
        offScreenGraphics.fillOval(w/2+35,35,w/2-70,h-70);  //Eyes
        offScreenGraphics.setColor(Color.black);
        // next line to calculate the arc
        leftCoX=x-w/4;leftCoY=y-h/2;
        rightCoX=x-3*w/4;rightCoY=y-h/2;
        arcLeft=(float) Math.atan((double)leftCoY/leftCoX);
        if(leftCoX<0) arcLeft+=3.1415926;//since atan result is between -pi/2 --p/2
        arcRight=(float)Math.atan((double)rightCoY/rightCoX);
        if(rightCoX<0) arcRight+=3.1415926;
        eyeBallPosition(leftCoX ,leftCoY,arcLeft);
        offScreenGraphics.fillOval(w/4+eyeX-25,h/2+eyeY-25,50,50);

        eyeBallPosition(rightCoX,rightCoY,arcRight);
        offScreenGraphics.fillOval(3*w/4+eyeX-25,h/2+eyeY-25,50,50);
        //offScreenGraphics.fillOval(w/4, h/2,50,50);
        //offScreenGraphics.fillOval(3*w/4,h/2,50,50);     //Eye balls
        g.drawImage(offScreen,0,0,null);
      }

    }
public void eyeBallPosition(int CoX, int CoY, float Arc)
{
if((CoX*CoX+CoY*CoY)<h/5*h/5)
//the mouse in the eye pit
  {
       eyeX=CoX;eyeY=CoY;
  }
else
   {
       eyeX=(int)(Math.cos((double)Arc)*h/5);
       eyeY=(int)(Math.sin((double)Arc)*h/5);
    }
}
public void     update(Graphics g)
    {
       paint(g);
    }
    public void run()
    {
       while(true)
       {
           //mouseMove(new Event e, new int x,new int y);
           repaint();
           try{
           motor.sleep(100);
           }
           catch(Exception e)
           {
             System.out.println("Exception\n");
           }
       }
    }
    public void start()
    {
      motor=new Thread(this);
      motor.setPriority(Thread.MIN_PRIORITY);
      motor.start();
    }
    public void stop()
    {
     }
public boolean   mouseMove(Event e,int X,int Y)
    {
        x=X;
        y=Y;
        //System.out.println("x="+x+"  "+"y="+y);
        return (true);
    }
}



--
爱在不言中......

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