animateface.java

Java 入门书的源码

//Copyright (c) 1998, Arthur Gittleman
//This example is provided WITHOUT ANY WARRANTY either expressed or implied.

/* Animates a face, drawing it in three different sizes
 * with an interval of 300 milliseconds between each
 * repainting.
 */

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

public class AnimateFace extends Applet 
                           implements Runnable{
  private int x, y,width,height;
  private int leftEyeX,leftEyeY,lwidth,lheight;
  private int rightEyeX,rightEyeY,rwidth,rheight;
  private int leftNoseX,leftNoseY,rightNoseX,rightNoseY;
  private int mouthX,mouthY,mouthWidth,mouthHeight;
  private boolean done;

  public void start() {
    x=10;y=10;width=200;height=200;
    leftEyeX=50;leftEyeY=70;lwidth=30;lheight=30;
    rightEyeX=150;rightEyeY=70;rwidth=30;rheight=30;
    leftNoseX=90;leftNoseY=120;rightNoseX=140;rightNoseY=120;
    mouthX=50;mouthY=130;mouthWidth=120;mouthHeight=40;    
    done = false;
    Thread t = new Thread(this);
    t.start();
  }
  public void stop() {
    done = true;
  }
  public void paint(Graphics g) {
    g.drawOval(x,y,width,height);
    g.fillOval(leftEyeX,leftEyeY,lwidth,lheight);
    g.fillOval(rightEyeX,rightEyeY,rwidth,rheight);
    g.drawLine(leftNoseX,leftNoseY,rightNoseX,rightNoseY);
    g.fillArc(mouthX,mouthY,mouthWidth,mouthHeight,180,180); 
  }
  public void run() {
    int dx=9, dy=9;
    while (true) {
      for (int i=0;i<3;i++) { 
        if (done) return;
        x+=dx; y+=dy; width-=dx; height-=dy;
        leftEyeX+=dx; leftEyeY+=dy;lwidth-=dx;lheight-=dy;
        rightEyeX+=dx;rightEyeY+=dy;rwidth-=dx;rheight-=dy;
        leftNoseX+=dx;rightNoseX-=dx;
        mouthX+=dx;mouthY+=dy;mouthWidth-=dx;mouthHeight-=dy;  
        repaint();
        try {
          Thread.sleep(300);
        }catch(InterruptedException e) {
           e.printStackTrace();
        }   
      }
      dx = -dx; dy = -dy; 
    }
  }
}