Jave 鼠标点击画太极 PaintTaiji (整理)

 package demo;

 /**
  *                 Jave 鼠标点击画太极 PaintTaiji (整理)
  * 声明：
  *     又是一份没有注释的代码，而且时间已经久远了，不过代码很短，解读起来应该
  * 不会很麻烦。
  *
  *                                           2016-1-2 深圳 南山平山村 曾剑锋
  */

 import java.awt.Color;
 import java.awt.Graphics;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.util.ArrayList;

 import javax.swing.JFrame;
 import javax.swing.JPanel;

 public class PaintTaiji extends JPanel{
     private static final long serialVersionUID = 1L;
     //所有的数据都是依照
     static int  centerX = 600/2;
     static int centerY = centerX;
     ArrayList<Taiji> taijis = new ArrayList<Taiji>();

     public PaintTaiji() {
         startRun();
         this.addMouseListener(new MouseListener() {

             @Override
             public void mouseReleased(MouseEvent e) {
                 // TODO Auto-generated method stub

             }

             @Override
             public void mousePressed(MouseEvent e) {
                 int mouseX = e.getX();
                 int mouseY = e.getY();
                 taijis.add(new Taiji(mouseX, mouseY));
             }

             @Override
             public void mouseExited(MouseEvent e) {
                 // TODO Auto-generated method stub

             }

             @Override
             public void mouseEntered(MouseEvent e) {
                 // TODO Auto-generated method stub

             }

             @Override
             public void mouseClicked(MouseEvent e) {
             }
         });
     }
     @Override
     public void paint(Graphics graphics) {
         super.paint(graphics);
         this.setBackground(Color.red);
         for (Taiji taiji : taijis) {
             taiji.paint(graphics);
         }
     }

     public static void main(String[] args) {
         JFrame jFrame = new JFrame();
         //设置JFrame标题
         jFrame.setTitle("TaiJi");
         //设置JFrame的大小
         jFrame.setSize(centerX*2, centerY*2);
         jFrame.setLocationRelativeTo(null);
         jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         PaintTaiji taiji = new PaintTaiji();
         jFrame.add(taiji);

         //将窗口设置为可见
         jFrame.setVisible(true);
     }
     public void startRun() {
         new Thread(){
             public void run() {
                 while(true){
                    try{
                            for (Taiji taiji : taijis) {
                            taiji.angle += taiji.angleStep;
                            }
                         Thread.sleep(20);
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                     repaint();
                 }
             };
         }.start();
     }
 }
 class Taiji{
     int centerX;
     int centerY;
     int extendCircleSemi = (int)(Math.random()*200)+1;
     int innerCircleSemi = extendCircleSemi/2;
     //旋转角度，值由线程维护，大约每20ms自加1
     int angle = 0;
     int angleStep = (int)(Math.random()*6)+1;
     public Taiji(int x, int y) {
         centerX = x;
         centerY = y;
     }

     public void paint(Graphics graphics ) {
         graphics.setColor(    Color.white);
         graphics.fillArc(    centerX-extendCircleSemi,
                             centerY-extendCircleSemi,
                             extendCircleSemi*2,
                             extendCircleSemi*2, 0+angle, 180);
         graphics.setColor(    Color.black);
         graphics.fillArc(    centerX-extendCircleSemi,
                             centerY-extendCircleSemi,
                             extendCircleSemi*2,
                             extendCircleSemi*2,
                             180+angle, 180);
         graphics.fillArc(    centerX+(int)(Math.cos(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi,
                             centerY-(int)(Math.sin(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi,
                             innerCircleSemi*2,
                             innerCircleSemi*2,
                             0,
                             360);
         graphics.setColor(    Color.white);
         graphics.fillArc(    centerX+(int)(Math.cos(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi/2,
                             centerY-(int)(Math.sin(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi/2,
                             innerCircleSemi,
                             innerCircleSemi,
                             0,
                             360);
         graphics.setColor(    Color.white);
         graphics.fillArc(    centerX-(int)(Math.cos(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi,
                             centerY+(int)(Math.sin(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi,
                             innerCircleSemi*2,
                             innerCircleSemi*2,
                             0,
                             360);
         graphics.setColor(    Color.black);
         graphics.fillArc(    centerX-(int)(Math.cos(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi/2,
                             centerY+(int)(Math.sin(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi/2,
                             innerCircleSemi,
                             innerCircleSemi,
                             0,
                             360);
     }
 }

效果如图：