📄 cewolfxy5.jsp
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<!--
Fig. 8.4_04_05: CewolfXY5.jsp
功能: Cewolf 编程实例17: 基于XYDataset的直方图
-->
<%@ page contentType="text/html;charset=GB2312"%>
<%@ include file="CewolfXYDataset.jsp" %>
<%
// 创建数据集
DatasetProducer timeData = new DatasetProducer()
{
public Object produceDataset(Map params)
{
TimeSeriesCollection dataset = new TimeSeriesCollection();
TimeSeries ts = new TimeSeries("2004年国际原油月均价格", Month.class);
double price = 45.75;
for (int month = 1; month <= 12; month++)
{
// 生成原油价格
price += Math.random() * 10-5.5;
ts.add(new Month(month, 2004), price);
}
dataset.addSeries(ts);
return dataset;
}
public String getProducerId()
{
return "TimeDataProducer";
}
public boolean hasExpired(Map params, Date since)
{
return false;
}
};
pageContext.setAttribute("timeData", timeData);
%>
<HTML>
<HEAD>
<TITLE>Cewolf 编程实例17: 基于XYDataset的直方图</TITLE>
</HEAD>
<BODY>
<cewolf:chart
id="verticalXY"
title="Cewolf 编程实例17: 基于XYDataset的直方图"
type="verticalXYBar">
<cewolf:colorpaint color="#FFCC99"/>
<cewolf:data>
<cewolf:producer id="timeData"/>
</cewolf:data>
</cewolf:chart>
<cewolf:img
chartid="verticalXY"
renderer="/cewolf"
width="500"
height="375">
</cewolf:img>
</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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