📄 jpie3d.jsp
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<!--
Fig. 8.2_09: jPie3D.jsp
功能: JFreeChart实例9: 实心3D饼图
-->
<%@ page language="java" contentType="image/png;charset=GB2312"
import="java.awt.*"
import="org.jfree.chart.*"
import="org.jfree.chart.servlet.*"
import="org.jfree.chart.plot.*"
import="org.jfree.chart.renderer.*"
import="org.jfree.chart.entity.*"
import="org.jfree.chart.title.*"
import="org.jfree.data.*"
import="org.jfree.data.general.*"
import="org.jfree.ui.*"
import="org.jfree.util.*"
%>
<%!
String bookTitle[] = {"Python", "JAVA", "C#", "Perl", "PHP"};
String chartTitle = "JFreeChart实例9: 实心3D饼图";
// 创建数据集
public PieDataset createDataset()
{
DefaultPieDataset dataset = new DefaultPieDataset();
for (int i = 0; i < bookTitle.length; i++)
{
dataset.setValue(bookTitle[i], (int)(10 + Math.random()* 40));
}
return dataset;
}
public JFreeChart createChart(PieDataset dataset)
{
JFreeChart chart = ChartFactory.createPieChart3D
(
chartTitle, // 图表标题
dataset, // 数据集
true, // 定义图例
true,
false
);
return chart;
}
%>
<%
// 创建一个 500X375 的图像
int width=500, height=375;
PieDataset dataset = createDataset();
JFreeChart chart = createChart(dataset);
// 开始自定义图表绘制的相关属性
// 设置图表的背景颜色
chart.setBackgroundPaint(new Color(254, 222, 171));
// 自定义图表的标题的字体和颜色
TextTitle title = chart.getTitle();
title.setFont(new Font("汉真广标", Font.BOLD, 25));
title.setPaint(new Color(40, 69, 113));
// 获得图表对象的引用
PiePlot plot = (PiePlot3D) chart.getPlot();
GradientPaint bg = new GradientPaint(0, 50, new Color(248, 253, 255),
0, 250, new Color(205, 237, 252));
plot.setBackgroundPaint(bg);
// 设置第1段圆弧的绘制起始角度
plot.setStartAngle(60);
// 设置饼图的绘制方向:顺时针或者逆时针
plot.setDirection(Rotation.ANTICLOCKWISE);
// 设置饼图轮廓线的绘制属性:颜色及线条粗细
plot.setSectionOutlinePaint(new Color(26, 79, 169));
plot.setSectionOutlineStroke(new BasicStroke(1.5f));
// 设置饼图的外观为椭圆形还是正圆形
plot.setCircular(false);
// 结束自定义图表绘制的相关属性
ChartRenderingInfo info =
new ChartRenderingInfo(new StandardEntityCollection());
// 设置图片生成格式
String fileName =
ServletUtilities.saveChartAsPNG(chart, width, height, info, session);
// 设置图片生成路径
String graphURL =
request.getContextPath() + "/servlet/DisplayChart?filename=" + fileName;
%>
<HTML>
<HEAD>
<TITLE><%=chartTitle%></TITLE>
</HEAD>
<BODY>
<P ALIGN="CENTER">
<img src="<%=graphURL %>" border="1" >
</P>
</BODY>
</HTML>
<%
/**************************************************************************
* (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. *
**************************************************************************/
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