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<Taiji> taijis = new ArrayList<Taiji>();
 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1
111     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 }