Java_Swing实现小球沿正弦曲线运动的代码

 1 package zuidaimapack_1;
 import java.awt.*;
 import javax.swing.*;
 /**
  *Java_Swing实现小球沿正弦曲线运动的代码
  * @author Visec·Dana
  */
 public class SinRun extends JFrame implements Runnable {
     private static final long serialVersionUID = 1L;
     static int i = 0;
     static int j = 250;
     static double x = 0;
     static double v = 5;// 速度
     static double w = 2 * Math.PI;
     static double A = 50;// 振幅
     static double t = 0;// 时间

     public SinRun() {
         this.setSize(500, 500);
         this.setVisible(true);
     }

     public void paint(Graphics g) {
         super.paint(g);
         g.setColor(Color.black);
         g.fillOval(i, j + (int) x, 10, 10);
     }
     public void run() {
         while (true) {
             try {
                 Thread.sleep(100);
             } catch (InterruptedException e) {
                 // e.printStackTrace();
             }
             i += v;
             x = A * Math.sin(w * t);
             t += 0.1;
             this.repaint();
             if (i > 500)
                 i = 0;
         }
     }
     public static void main(String args[]) {
         new Thread(new SinRun()).start();
     }
 }