rollingtext.jsp

提供 精通Java Web动态图表编程 一书的源代码, 大家赶快下载呀

<!--
	Fig. 7.11_02: rollingText.jsp
	功能: 基于Java2D的Web图表实例13: 绘制弯曲文本
-->
<%@ page language="java" contentType="image/png;charset=GB2312"
	import="java.awt.*"
	import="javax.imageio.*"
	import="java.awt.geom.*"
	import="java.awt.image.*"
    import="java.awt.font.*"
%>

<%
		// 清空缓冲区
		response.reset();

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

		// 创建一个 500X375 的图像
		int width = 500, height = 375;

		BufferedImage image = new BufferedImage(width, height,
			BufferedImage.TYPE_INT_RGB);

		// 创建Java2D对象
		Graphics2D g2d = image.createGraphics();

		// 填充背景
		g2d.setColor(Color.WHITE);
		g2d.fillRect(0, 0, width, height);
		g2d.setColor(Color.BLACK);
        
        String rollingText = "精通Java Web图表编程";
        Font font = new Font("华文琥珀", Font.PLAIN, 35);
        FontRenderContext frc = g2d.getFontRenderContext();
        
		g2d.translate(10, 40);

        GlyphVector gv = font.createGlyphVector(frc, rollingText);
        int length = gv.getNumGlyphs();

        for (int i = 0; i < length; i++) 
		{
			  Point2D p = gv.getGlyphPosition(i);
			  double theta = (double)i / (double)(length - 1) * Math.PI / 2.8;
			  AffineTransform at = 
				  AffineTransform.getTranslateInstance(p.getX(), p.getY());
			  at.rotate(theta);
			  Shape glyph = gv.getGlyphOutline(i);
			  Shape transformedGlyph = at.createTransformedShape(glyph);
			  g2d.fill(transformedGlyph);
        }  

		// 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.                                 *
 **************************************************************************/
 %>