animator.java~70~

Java 程序设计源码 只提供了部分

import java.applet.*;
import java.awt.Graphics;
import java.awt.Color;
import javax.swing.JLabel;
import java.awt.BorderLayout;

public class Animator extends Applet
    implements Runnable {
  Thread runner;
  int x, y;
  JLabel happy;

  public void init() {
    x = 0;
    y = 200;

    happy = new JLabel("Merry Christmas to my pig head.");
    add(happy, BorderLayout.CENTER);
  }

  public void start() {
    runner = new Thread(this);

    runner.start();
  }

  public void run() {
    while(true) {
      //x += 4;
      //y += 4;

      //使一个对象 绕圈的 判断算法
      if(x >= 0 & x < 200) {
       if(y >= 200 & y <= 400) {
          x += 4;
          y += 4;
        }
        else if(y < 200) {
          x -= 4;
          y += 4;
        }
      }
      else if(x >= 200 & x <= 400) {
        if( y <= 0) {
          x -= 4;
          y += 4;
        }
        else if(y > 0 & y <= 200) {
          x -= 4;
          y -= 4;
        }
        else if( y > 200 & y <= 400) {
          x += 4;
          y -= 4;
        }
      }
     //算法结束
     //注释掉这个算法 去掉其它的注释 有另一个显示效果


      repaint();

      /*if(x > 200) {
        return;
      }
      */

      try {
        Thread.sleep(10);
      }
      catch(InterruptedException e) {
        ;
      }
    }
  }

  public void paint(Graphics g) {
    g.setColor(Color.blue); //对象颜色
    g.fillOval(x, y, 30, 20);
  }
}