太极阴阳图
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一：基本原理
利用Java 2D的Area对象对绘制形状几何操作的支持，完成太极图案的绘制，使用Paint 来完成对不同颜色的填充。Java 2D图形API Area对Shape支持四种几何操作：
- Add （加）- 保留两个几何形状及其重叠部分
- Subtract (减) –从第一个几何形状上减去和第二个重叠的部分，保留减去之后的第一个几何形状
- Intersect (与) –只保留两个几何形状重叠的部分。
- ExclusiveOr(或) –保留他们相互不重叠的部分。
参看下图：
二：程序运行效果
程序基于JDK6 API完成
程序源代码如下：
[java]view plaincopy
1.package com.gloomyfish.swing;
2.
3.import java.awt.BorderLayout;
4.import java.awt.Color;
5.import java.awt.Dimension;
6.import java.awt.Graphics;
7.import java.awt.Graphics2D;
8.import java.awt.RenderingHints;
9.import java.awt.Shape;
10.import java.awt.geom.Area;
11.import java.awt.geom.Ellipse2D;
12.import java.awt.geom.Rectangle2D;
13.import java.awt.image.BufferedImage;
14.import java.io.File;
15.
16.import javax.imageio.ImageIO;
17.import javax.swing.JComponent;
18.import javax.swing.JFrame;
19.
20.public class YingYangGraphics extends JComponent {
21.
22./**
23. *
24. */
25.private static final long serialVersionUID = 8812325148970066491L;
26.private BufferedImage image = null;
27.public YingYangGraphics() {
28.super();
29.this.setOpaque(false);
30. }
31.protected void paintComponent(Graphics g) {
32. Graphics2D g2 = (Graphics2D)g;
33. g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.
VALUE_ANTIALIAS_ON);
34. g2.drawImage(getImage(), 0, 0, image.getWidth(), image.getHeight(),
null);
35. Shape lefthalfCirle = new Ellipse2D.Double(10,10, 300,300); // R = 1
50
36. Shape righthalfCircle = new Ellipse2D.Double(10,10, 300,300); // R =
150
37. Shape innerCircle1 = new Ellipse2D.Double(85,10, 150,150); // R/2 =
75
38. Shape innerCircle2 = new Ellipse2D.Double(85,160, 150,150); // R = 1
50
39.
40. Shape rectangel1 = new Rectangle2D.Double(160, 10, 150, 300);
41. Shape rectangel2 = new Rectangle2D.Double(10, 10, 150, 300);
42.
43. Area left = new Area(lefthalfCirle);
44. Area right = new Area(righthalfCircle);
45.
46. Area area11 = new Area(rectangel1);
47. Area area22 = new Area(rectangel2);
48.
49. left.subtract(area11);
50. right.subtract(area22);
51.
52. Area inner1 = new Area(innerCircle1);
53. Area inner2 = new Area(innerCircle2);
54.
55. left.add(inner1);
56.//left.subtract(inner2);
57. right.add(inner2);
58. right.subtract(inner1); // trick is here !!!
59.
60.
61.// create minor circle here!!!
62. Shape minorWhiteCircle = new Ellipse2D.Double(150,70, 20,20); // ++
60
63. Shape innerBlackCircle = new Ellipse2D.Double(150,230, 20,20); // R
= 150
64.
65.// draw two big frame shape here...
66. g2.setPaint(Color.WHITE);
67. g2.fill(left);
68. g2.setPaint(Color.BLACK);
69. g2.fill(right);
70.
71.// draw minor circle here!!!
72. g2.fill(minorWhiteCircle);
73. g2.setPaint(Color.WHITE);
74. g2.fill(innerBlackCircle);
75. }
76.
77.private BufferedImage getImage() {
78.if(image != null) {
79.return image;
80. }
81.try {
82. File file = new File("D:\\android\\blue_flower.jpg");
83. image = ImageIO.read(file);
84. } catch (Exception e) {
85. e.printStackTrace();
86. }
87.return image;
88. }
89.
90.public static void main(String[] args) {
91. JFrame frame = new JFrame("Test Panel");
92. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
93. frame.getContentPane().setLayout(new BorderLayout());
94.
95.// Display the window.
96. frame.getContentPane().add(new YingYangGraphics(), BorderLayout.CENT
ER);