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。

背景图片我是在网上找来的，可以自己替换的。

程序源代码如下：

package com.gloomyfish.swing;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import java.awt.Shape;

import java.awt.geom.Area;

import java.awt.geom.Ellipse2D;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.io.File;

import javax.imageio.ImageIO;

import javax.swing.JComponent;

import javax.swing.JFrame;

public class YingYangGraphics extends JComponent {

/**

*

*/

private static final long serialVersionUID = 8812325148970066491L;

private BufferedImage image = null;

public YingYangGraphics() {

super();

this.setOpaque(false);

}

protected void paintComponent(Graphics g) {

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

g2.drawImage(getImage(), 0, 0, image.getWidth(), image.getHeight(), null);

Shape lefthalfCirle = new Ellipse2D.Double(10,10, 300,300); // R = 150

Shape righthalfCircle = new Ellipse2D.Double(10,10, 300,300); // R = 150

Shape innerCircle1 = new Ellipse2D.Double(85,10, 150,150); // R/2 = 75

Shape innerCircle2 = new Ellipse2D.Double(85,160, 150,150); // R = 150

Shape rectangel1 = new Rectangle2D.Double(160, 10, 150, 300);

Shape rectangel2 = new Rectangle2D.Double(10, 10, 150, 300);

Area left = new Area(lefthalfCirle);

Area right = new Area(righthalfCircle);

Area area11 = new Area(rectangel1);

Area area22 = new Area(rectangel2);

left.subtract(area11);

right.subtract(area22);

Area inner1 = new Area(innerCircle1);

Area inner2 = new Area(innerCircle2);

left.add(inner1);

//left.subtract(inner2);

right.add(inner2);

right.subtract(inner1); // trick is here !!!

// create minor circle here!!!

Shape minorWhiteCircle = new Ellipse2D.Double(150,70, 20,20); // ++ 60

Shape innerBlackCircle = new Ellipse2D.Double(150,230, 20,20); // R = 150

// draw two big frame shape here...

g2.setPaint(Color.WHITE);

g2.fill(left);

g2.setPaint(Color.BLACK);

g2.fill(right);

// draw minor circle here!!!

g2.fill(minorWhiteCircle);

g2.setPaint(Color.WHITE);

g2.fill(innerBlackCircle);

}

private BufferedImage getImage() {

if(image != null) {

return image;

}

try {

File file = new File("D:\\android\\blue_flower.jpg");

image = ImageIO.read(file);

} catch (Exception e) {

e.printStackTrace();

}

return image;

}

public static void main(String[] args) {

JFrame frame = new JFrame("Test Panel");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().setLayout(new BorderLayout());

// Display the window.

frame.getContentPane().add(new YingYangGraphics(), BorderLayout.CENTER);

frame.setPreferredSize(new Dimension(330,350));

frame.pack();

frame.setVisible(true);

}

}