📄 cewolfvbar.jsp
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<!--
Fig. 8.4_01: CewolfVBar.jsp
功能: Cewolf 编程实例1: 垂直直方图
-->
<%@ page contentType="text/html;charset=GBK"%>
<%@ taglib uri='/WEB-INF/cewolf.tld' prefix='cewolf' %>
<%@ page import="java.util.*"%>
<%@ page import="de.laures.cewolf.*, de.laures.cewolf.tooltips.*"%>
<%@ page import="de.laures.cewolf.links.*"%>
<%@ page import="org.jfree.data.*, org.jfree.chart.*"%>
<%@ page import="org.jfree.data.category.*"%>
<%!
String chartTitle = "Cewolf 编程实例1: 垂直直方图";
String bookTitle[] = {"Python", "JAVA", "C#", "Perl", "PHP"};
String category[] = {"第1周", "第2周", "第3周", "第4周" };
%>
<%
// 创建数据集
DatasetProducer categoryData = new DatasetProducer()
{
public Object produceDataset(Map params)
{
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
// 往数据集中添加绘制图表所需的数据
int bookSales;
for (int i=0; i < bookTitle.length; i++)
{
for (int j=0; j < category.length; j++ )
{
bookSales = 50 + (int)(Math.random() * 50);
dataset.addValue(bookSales, bookTitle[i], category[j]);
}
}
return dataset;
}
public String getProducerId()
{
return "CategoryDataProducer";
}
public boolean hasExpired(Map params, Date since)
{
return false;
}
};
pageContext.setAttribute("categoryData", categoryData);
%>
<HTML>
<HEAD>
<TITLE><%=chartTitle%></TITLE>
</HEAD>
<BODY>
<cewolf:chart
id="verticalBar"
title="Cewolf 编程实例1: 垂直直方图"
type="verticalBar"
xaxislabel="销售时间:2005年4月"
yaxislabel="销售量">
<cewolf:data>
<cewolf:producer id="categoryData" />
</cewolf:data>
</cewolf:chart>
<cewolf:img
chartid="verticalBar"
renderer="/cewolf"
width="500"
height="375"/>
</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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