📄 cewolfmeter.jsp
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<!--
Fig. 8.4_08: CewolfMeter.jsp
功能: Cewolf 编程实例22: 速度图表
-->
<%@ page contentType="text/html;charset=GB2312"%>
<%@ taglib uri='/WEB-INF/cewolf.tld' prefix='cewolf' %>
<%@ page import="java.util.*"%>
<%@ page import="de.laures.cewolf.*"%>
<%@ page import="de.laures.cewolf.tooltips.*"%>
<%@ page import="de.laures.cewolf.links.*"%>
<%@ page import="org.jfree.data.*"%>
<%@ page import="org.jfree.data.time.*"%>
<%@ page import="org.jfree.data.gantt.*"%>
<%@ page import="org.jfree.chart.*"%>
<%@ page import="org.jfree.chart.plot.*"%>
<%@ page import="org.jfree.chart.renderer.*"%>
<%@ page import="org.jfree.data.category.*"%>
<%@ page import="org.jfree.data.general.*"%>
<%@ page import="org.jfree.data.xy.*"%>
<%!
String chartTitle = "Cewolf 编程实例22: 速度图表";
double min = 0, max = 260;
double minCrit = 187, maxCrit = max;
double minWarn = 164, maxWarn = minCrit;
double minNorm = min, maxNorm = minCrit;
%>
<%
// 创建数据集
ChartPostProcessor meterPP = new ChartPostProcessor()
{
public void processChart(Object chart, Map params)
{
MeterPlot plot = (MeterPlot)((JFreeChart)chart).getPlot();
plot.setRange(new Range(min, max));
plot.setNormalRange(new Range(minNorm, maxNorm));
plot.setWarningRange(new Range(minWarn, maxWarn));
plot.setCriticalRange(new Range(minCrit, maxCrit));
plot.setUnits("公里/小时");
}
};
pageContext.setAttribute("meterRanges", meterPP);
DatasetProducer valueDatasetProducer = new DatasetProducer()
{
public Object produceDataset(Map params)throws DatasetProduceException
{
int speed = 1+(int)(Math.random() * max);
DefaultValueDataset data = new DefaultValueDataset(speed);
return data;
}
public boolean hasExpired(Map params, Date since)
{
return false;
}
public String getProducerId()
{
return "meterdata";
}
};
pageContext.setAttribute("meterData", valueDatasetProducer);
%>
<HTML>
<HEAD>
<TITLE><%=chartTitle%></TITLE>
</HEAD>
<BODY>
<cewolf:chart
id="meterChart"
title="<%=chartTitle%>"
type="meter">
<cewolf:data>
<cewolf:producer id="meterData" />
</cewolf:data>
<cewolf:colorpaint color="#FFFFFF"/>
<cewolf:chartpostprocessor id="meterRanges">
</cewolf:chartpostprocessor>
</cewolf:chart>
<cewolf:img
chartid="meterChart"
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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