texturedpaint.jsp

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<!--
	Fig. 7.3_02: texturedPaint.jsp
	功能: Java2D的纹理填充
-->
<%@ page language="java" contentType="image/png;charset=GB2312"
	import="java.awt.*"
	import="javax.imageio.*"
	import="java.awt.geom.*"
	import="java.awt.image.*"
	import="java.io.*"
%>

<%
		// 清空缓冲区
		response.reset();

		// 注意这里的MIME类型
		response.setContentType("image/png");

		// 创建一个 320X400 的图像
		int width = 320, height = 400;

		BufferedImage image = new BufferedImage(width, height,
		  BufferedImage.TYPE_INT_RGB);
		Graphics g = image.getGraphics();
	    
		// 创建Java2D对象
		Graphics2D g2d = (Graphics2D)g;

		// 创建纹理背景图像
		BufferedImage bg = new BufferedImage(10, 10,
		  BufferedImage.TYPE_INT_RGB);
		
		Graphics2D bg2d = bg.createGraphics();
		bg2d.setColor(Color.YELLOW);
		bg2d.fillRect(0, 0, 10, 10);
		bg2d.setColor(Color.RED);
		bg2d.fillRect(1, 1, 6, 6);
		bg2d.setColor(Color.BLUE);
		bg2d.fillRect(2, 2, 4, 4);
		bg2d.setColor(Color.BLACK);
		bg2d.fillRect(4, 4, 3, 3);

		// 创建纹理填充对象
		TexturePaint tp1 = new TexturePaint(bg, new Rectangle(10,10));
        g2d.setPaint(tp1);

		g2d.fillRect(0, 0, width, height);

		// 加载图像文件 
		File jpgFile = 
			new File(getServletContext().getRealPath("javaLogo.jpg"));
		BufferedImage im = ImageIO.read(jpgFile);
		
		// 创建纹理填充对象
		TexturePaint tp2 = 
			new TexturePaint(im, new Rectangle(im.getWidth(),im.getHeight()));
    
		// 填充椭圆
		g2d.setPaint(tp2);
		g2d.fillOval(50, 50, width -100, height-100);

		// 部署图形
		g2d.dispose();

		// 利用ImageIO类的write方法对图像进行编码
		ServletOutputStream sos = response.getOutputStream();
		ImageIO.write(image, "PNG", sos);
		sos.close();
%>

<%
/**************************************************************************
 * (C) Copyright 2004-2005 by Jingkui Zhong(钟京馗) and Huan Tang(唐桓).  *
 * All Rights Reserved.                                                   *
 *                                                                        *
 * DISCLAIMER: The authors of this code have used their                   *
 * best efforts in preparing the code. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these codes. The authors *
 * shall not be liable in any event for incidental or consequential       *
 * damages in connection with, or arising out of, the furnishing,         *
 * performance, or use of these programs.                                 *
 **************************************************************************/
 %>