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 = 150Shape righthalfCircle = new Ellipse2D.Double(10,10, 300,300); // R = 150Shape innerCircle1 = new Ellipse2D.Double(85,10, 150,150); // R/2 = 75Shape innerCircle2 = new Ellipse2D.Double(85,160, 150,150); // R = 150Shape 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); // ++ 60Shape 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);}}