怎样用java写html 怎样用java写出流动红旗

1 package cn.hq.szxy;
 2  
 3 import javax.swing.*;
 4 import java.awt.geom.*;
 5 import java.awt.*;
 6  
 7 /**
 8  *
 9  * @author HQ
10  * @date 2018/10/1
11  */
12 public class FiveStarFlag extends JPanel {
13  
14     public static void main(String[] args) {
15         JFrame jFrame = new JFrame("五星红旗");
16         jFrame.getContentPane().add(new FiveStarFlag(600));
17         jFrame.pack();
18         jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
19         jFrame.setLocationRelativeTo(null);
20         jFrame.setVisible(true);
21     }
22  
23     /**
24      * 创建一个五角星形状.
25      * 该五角星的中心坐标为(sx,sy),中心到顶点的距离为radius,其中某个顶点与中心的连线的偏移角度为theta(弧度)
26      *
27      * @return pentacle 一个☆
28      */
29     public static Shape createPentacle(double sx, double sy, double radius, double theta) {
30         final double arc = Math.PI / 5;
31         final double rad = Math.sin(Math.PI / 10) / Math.sin(3 * Math.PI / 10);
32         GeneralPath path = new GeneralPath();
33         path.moveTo(1, 0);
34         for (int i = 0; i < 5; i++) {
35             path.lineTo(rad * Math.cos((1 + 2 * i) * arc), rad * Math.sin((1 + 2 * i) * arc));
36             path.lineTo(Math.cos(2 * (i + 1) * arc), Math.sin(2 * (i + 1) * arc));
37         }
38         path.closePath();
39         AffineTransform atf = AffineTransform.getScaleInstance(radius, radius);
40         atf.translate(sx / radius, sy / radius);
41         atf.rotate(theta);
42         return atf.createTransformedShape(path);
43     }
44  
45     private int width, height;
46     private double maxR = 0.15, minR = 0.05;
47     private double maxX = 0.25, maxY = 0.25;
48     private double[] minX = {0.50, 0.60, 0.60, 0.50};
49     private double[] minY = {0.10, 0.20, 0.35, 0.45};
50  
51     /**
52      * 创建一个宽度为width的国旗
53      */
54     public FiveStarFlag(int width) {
55         this.width = width / 3 * 3;
56         this.height = width / 3 * 2;
57         setPreferredSize(new Dimension(this.width, this.height));
58     }
59  
60     @Override
61     protected void paintComponent(Graphics g) {
62         Graphics2D graphics2D = (Graphics2D) g;
63  
64         //画旗面
65         graphics2D.setPaint(Color.RED);
66         graphics2D.fillRect(0, 0, width, height);
67  
68         //画大☆
69         double ox = height * maxX, oy = height * maxY;
70         graphics2D.setPaint(Color.YELLOW);
71         graphics2D.fill(createPentacle(ox, oy, height * maxR, -Math.PI / 2));
72  
73         //画小★
74         for (int i = 0; i < 4; i++) {
75             double sx = minX[i] * height, sy = minY[i] * height;
76             double theta = Math.atan2(oy - sy, ox - sx);
77             graphics2D.fill(createPentacle(sx, sy, height * minR, theta));
78         }
79     }
80 }