1 package demo;  2   3 /**  4  *                 Jave 鼠标点击画太极 PaintTaiji (整理)  5  * 声明：  6  *     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  7  * 不会很麻烦。  8  *  9  *                                           2016-1-2 深圳 南山平山村 曾剑锋 10  */ 11  12 import java.awt.Color; 13 import java.awt.Graphics; 14 import java.awt.event.MouseEvent; 15 import java.awt.event.MouseListener; 16 import java.util.ArrayList; 17  18 import javax.swing.JFrame; 19 import javax.swing.JPanel; 20  21 public class PaintTaiji extends JPanel{ 22     private static final long serialVersionUID = 1L; 23     //所有的数据都是依照 24     static int  centerX = 600/2; 25     static int centerY = centerX; 26     ArrayList
     
       taijis = new ArrayList
      
       (); 27      28      29     public PaintTaiji() { 30         startRun(); 31         this.addMouseListener(new MouseListener() { 32              33             @Override 34             public void mouseReleased(MouseEvent e) { 35                 // TODO Auto-generated method stub 36                  37             } 38              39             @Override 40             public void mousePressed(MouseEvent e) { 41                 int mouseX = e.getX(); 42                 int mouseY = e.getY(); 43                 taijis.add(new Taiji(mouseX, mouseY)); 44             } 45              46             @Override 47             public void mouseExited(MouseEvent e) { 48                 // TODO Auto-generated method stub 49                  50             } 51              52             @Override 53             public void mouseEntered(MouseEvent e) { 54                 // TODO Auto-generated method stub 55                  56             } 57              58             @Override 59             public void mouseClicked(MouseEvent e) { 60             } 61         }); 62     } 63     @Override 64     public void paint(Graphics graphics) { 65         super.paint(graphics); 66         this.setBackground(Color.red); 67         for (Taiji taiji : taijis) { 68             taiji.paint(graphics); 69         } 70     } 71      72     public static void main(String[] args) { 73         JFrame jFrame = new JFrame(); 74         //设置JFrame标题 75         jFrame.setTitle("TaiJi"); 76         //设置JFrame的大小 77         jFrame.setSize(centerX*2, centerY*2); 78         jFrame.setLocationRelativeTo(null); 79         jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 80          81         PaintTaiji taiji = new PaintTaiji(); 82         jFrame.add(taiji); 83  84         //将窗口设置为可见 85         jFrame.setVisible(true); 86     } 87     public void startRun() { 88         new Thread(){ 89             public void run() { 90                 while(true){ 91                    try{ 92                            for (Taiji taiji : taijis) { 93                            taiji.angle += taiji.angleStep; 94                            } 95                         Thread.sleep(20); 96                     } catch (InterruptedException e) { 97                         e.printStackTrace(); 98                     } 99                     repaint();100                 }101             };102         }.start();103     }104 }105 class Taiji{106     int centerX;107     int centerY;108     int extendCircleSemi = (int)(Math.random()*200)+1;109     int innerCircleSemi = extendCircleSemi/2;110     //旋转角度，值由线程维护，大约每20ms自加1111     int angle = 0;112     int angleStep = (int)(Math.random()*6)+1;113     public Taiji(int x, int y) {114         centerX = x;115         centerY = y;116     }117     118     public void paint(Graphics graphics ) {119         graphics.setColor(    Color.white);120         graphics.fillArc(    centerX-extendCircleSemi,121                             centerY-extendCircleSemi,122                             extendCircleSemi*2,123                             extendCircleSemi*2, 0+angle, 180);124         graphics.setColor(    Color.black);125         graphics.fillArc(    centerX-extendCircleSemi,126                             centerY-extendCircleSemi,127                             extendCircleSemi*2,128                             extendCircleSemi*2,129                             180+angle, 180);130         graphics.fillArc(    centerX+(int)(Math.cos(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi,131                             centerY-(int)(Math.sin(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi,132                             innerCircleSemi*2,133                             innerCircleSemi*2,134                             0,135                             360);136         graphics.setColor(    Color.white);137         graphics.fillArc(    centerX+(int)(Math.cos(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi/2,138                             centerY-(int)(Math.sin(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi/2,139                             innerCircleSemi,140                             innerCircleSemi,141                             0,142                             360);143         graphics.setColor(    Color.white);144         graphics.fillArc(    centerX-(int)(Math.cos(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi,145                             centerY+(int)(Math.sin(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi,146                             innerCircleSemi*2,147                             innerCircleSemi*2,148                             0,149                             360);150         graphics.setColor(    Color.black);151         graphics.fillArc(    centerX-(int)(Math.cos(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi/2,152                             centerY+(int)(Math.sin(Math.PI*angle/180)*innerCircleSemi)-innerCircleSemi/2,153                             innerCircleSemi,154                             innerCircleSemi,155                             0,156                             360);157     }158 }
      
     

 效果如图：