使用Java 2D绘制黑白太极图案

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); 	} }

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