How can I create a Pie charts ?

HI all,
I'm a beginner in java and i'm investigate in a web project (website) which should display statistical charts. I did a beans to generate basic bar charts, but it is most difficult to build a Pie chart. That's why i need help to put me on the rigth way to build Pie Charts beans (this pie charts should be filled up with db query).
Every kind of help will be appreciated.
Thanks in advance
Hope someone can help me.
STF

I take it you constructed the bar graphs using html and images together?
Obviously it's a little more difficult to make a pie chart with html. Chances are that it will have to be an image rendered by a Servlet or JSP. I suggest looking at how to create images using AWT or swing. This will allow you to create a circle with different color slices and what not. Then you need a Servlet or JSP that will send the image out the output stream. You can then place an image tag in your html page like this <img src="http://myserver.com/PieChartServlet>
I'm actually working on an API myself that will render pretty histograms (line graphs), and hopefully pie charts down the road. It's going to be an open source project. I decided to make my own API when I looked at some others out there who were charging an arm and a leg for theirs. Chart Builder for example, it's like $6K for their java based API <choke>.
So if you're interested, or anyone else is, shoot me an email and I'll let you know when the beta is ready. [email protected]
-Derek

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How can i create a pie chart

Hi all,
I'm a beginner in java and i'm investigate in a web project (website) which should display statistical charts. I did a beans to generate basic bar charts, but it's most difficult to build a pie chart. That's why i need help to put me on the right way of building a Piechart beans.
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Thanks a lot for your reply.
But it shall works in a beans and this was set up only for applications or applet. Besides it seems (i'm really not sure but i have found lot of thread)that an applet can't be run into a jsp page that is searching data into db (thanks to sql query)
: there is a problem of buffer (tomcat can't generate the jsp page in the same time as it execute the applet).
Let me know if i'm wrong or not please ?
Regards
STF

How can I creat a dynamic chart legend?

Will,I want to show multi hosts' dynamic CPU performance (the host ip can be changed).I use those code below for a test:
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="horizontal" backgroundColor="0xFFFFFF" initialize="init()">
     <mx:Script>
          <![CDATA[
               import mx.charts.ChartItem;
               import mx.charts.chartClasses.IAxis;
               import mx.charts.chartClasses.LegendData;
               import mx.charts.chartClasses.Series;
               import mx.charts.events.ChartItemEvent;
               import mx.charts.series.LineSeries;
               import mx.collections.ArrayCollection;
               import mx.containers.Canvas;
               import mx.containers.HBox;
               import mx.controls.Alert;
               import mx.graphics.SolidColor;
               [Bindable]
               private var dayTimeV:int = 0;
               [Bindable]
               private var legendDP:ArrayCollection = new ArrayCollection();
               //for record whether the ip changed by using the length
               private var latestIp2Length:Object = new Object();
               [Bindable]
               public var statsPpg:ArrayCollection = new ArrayCollection([
                    new ArrayCollection([{dayTime:dayTimeV,CPU:24.0, IP:"100.0.2.0"}]),
                    new ArrayCollection([{dayTime:dayTimeV,CPU:27.6, IP:"100.0.2.1"}]),
                    new ArrayCollection([{dayTime:dayTimeV,CPU:35.4, IP:"100.0.2.2"}]),
                    new ArrayCollection([{dayTime:dayTimeV,CPU:31.6, IP:"100.0.2.4"}]),
                    new ArrayCollection([{dayTime:dayTimeV,CPU:28.3, IP:"100.0.1.6"}]),
                    new ArrayCollection([{dayTime:dayTimeV,CPU:27.2, IP:"100.0.1.9"}])
               private function init():void{
                    latestIp2Length["100.0.2.0"] = 1;
                    latestIp2Length['100.0.2.1'] = 1;
                    latestIp2Length['100.0.2.2'] = 1;
                    latestIp2Length['100.0.2.4'] = 1;
                    latestIp2Length['100.0.1.6'] = 1;
                    latestIp2Length['100.0.1.9'] = 1;
                    initLegend();
                    createLineSeries();
               private function createLineSeries():void{
                    for(var i:int = 0 ;i < statsPpg.length ;i++){
                    var lineSeries:LineSeries = new LineSeries();
                    lineSeries.yField = "CPU";
                    lineSeries.displayName = "CPU";
                    lineSeries.dataProvider = statsPpg[i];
                    lineSeries.id = "lineSeries"+i;
                    lineSeries.setStyle("adjustedRadius",2);
                    lineSeries.setStyle("radius",40);
                    lineSeries.setStyle("fill","#55CC33");
                    var series:Array = chartPPG.series;
                    series.push(lineSeries);
                    chartPPG.series = series;
               //find the record using ip
               private function indexOf(ip:String):int{
                    for(var i:int = 0 ; i < statsPpg.length ;i++){
                    if(statsPpg[i].getItemAt(0).IP == ip)
                         return i;
                    return -1;
               private function modifyData():void{
                    dayTimeV++;
                    //all new added data
                    var forAdded:ArrayCollection = new ArrayCollection([
                         {dayTime:dayTimeV,CPU:24.0+Math.random()*10, IP:"100.0.2."+dayTimeV},
                         {dayTime:dayTimeV,CPU:27.6+Math.random()*10, IP:"100.0.2."+(dayTimeV+1)},
                         {dayTime:dayTimeV,CPU:35.4+Math.random()*10, IP:"100.0.2."+(dayTimeV+2)},
                         {dayTime:dayTimeV,CPU:31.6+Math.random()*10, IP:"100.0.2."+(dayTimeV+3)},
                         {dayTime:dayTimeV,CPU:28.3+Math.random()*10, IP:"100.0.1."+(dayTimeV+4)},
                         {dayTime:dayTimeV,CPU:27.2+Math.random()*10, IP:"100.0.1."+(dayTimeV+5)}
                    //the data(IP) appear at first time
                    var waitedForAdded:ArrayCollection = new ArrayCollection();
                    for(var i:int = 0 ; i < forAdded.length ;i++){
                         var index:int = indexOf(forAdded[i].IP);
                         if(index != -1){//if we found,append it
                              statsPpg[index].addItem(forAdded[i]);
                         }else{//if not,
                              waitedForAdded.addItem(forAdded[i]);
               var j:int = 0;
                for(i = 0 ; i < statsPpg.length ;i++){
                     // if length not changed,delete old data and add new
                     if(latestIp2Length[statsPpg[i][0].IP] == statsPpg[i].length){
                          delete latestIp2Length[statsPpg[i][0].IP];
                          var legendIndex:int = findLegendDPData(statsPpg[i][0].IP);
                          statsPpg[i].setItemAt(waitedForAdded[j],0);
                          latestIp2Length[waitedForAdded[j].IP] = statsPpg[i].length;
                          legendDP.setItemAt(newLegendData(waitedForAdded[j].IP),legendIndex);
                          j++;
                     }else{//if length changed,the data appended already
                          latestIp2Length[statsPpg[i][0].IP] = statsPpg[i].length;
               private function addData():void{
                    dayTimeV++;
                    newData();
               private function newLegendData(ip:String):LegendData{
                    var legendData:LegendData = new LegendData();
                    legendData.label= ip;
                    legendData.marker= new HBox();
                    legendData.aspectRatio=1;
                    return legendData;
               private function findLegendDPData(ip:String):int{
                    for(var i:int = 0;i < legendDP.length;i++){
                         if(legendDP[i].label == ip)
                              return i;
                    return -1;
               /* [Bindable]
               public function get legend():ArrayCollection
                    var legend:ArrayCollection = new ArrayCollection();
                    for (var i:int = 0; i < statsPpg.length; i++)
                         var dataObject:Object = statsPpg[i][0];
                         legend.addItem(newLegendData(dataObject.IP.toString()));
                    return legend;
               [Bindable]
               public function set legend(legendData:ArrayCollection):void
                         legend = legendData;
               private function initLegend():void
                    for (var i:int = 0; i < statsPpg.length; i++)
                         var dataObject:Object = statsPpg[i][0];
                         legendDP.addItem(newLegendData(dataObject.IP.toString()));
               private function yAxisLabel(value:Object, previousValue:Object, axis:IAxis):String
                    return value + ' %';
          ]]>
     </mx:Script>
     <mx:Panel width="790" title="CPU.IP" layout="horizontal">
          <mx:LineChart id="chartPPG" name="Comparison" showDataTips="true">
               <mx:horizontalAxis>
                    <mx:CategoryAxis dataProvider="{statsPpg[0]}" categoryField="dayTime" title="Days" id="categories"/>
               </mx:horizontalAxis>
               <mx:verticalAxis>
                    <mx:LinearAxis labelFunction="{yAxisLabel}" title="CPU" id="yAxis"/>
               </mx:verticalAxis>
               
          </mx:LineChart>
          
          
          <mx:Legend id="userLegend" dataProvider="{legendDP}"/>
          <mx:Button label="AddNewData" click="modifyData()"/>
     </mx:Panel>
</mx:Application>
the result is here:
Question:
1.I using the binding ArrayCollection legendDP as the Legend's dataprovider, the Legend's showing not changed when the legendDP changed
2.How can I fill the Legend's color,the result has no color showed.

Can anyone help?

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Can you please help me to achieve the below.
Can we create any Pie Chart. In Pie chart If we have 5 Parts when I click on any part of Pie chart It should display my new region below to the chart in the same page Page)?
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Sum all Costs, if the following conditions are true:
$Who Bought it?, "="&$Who Bought it?
Group items in the 'Who Bought it? column that match the item in the same row as the formula.
$Bought?, "=TRUE"
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Screenshot
I have highlighted the selected cell in red.
The coloured columns show which ones are relevant to the formula.
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check link-
https://forums.oracle.com/thread/2564233
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<ResourceLink global="jdbc/TestDB" name="jdbc/TestDB" type="oracle.jdbc.pool.OracleDataSource"/>
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log-
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at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
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at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
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at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
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at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:857)
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at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509)
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Aug 2, 2013 5:17:21 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: invalid arguments in call"
at org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.getConnection(QueryTagSupport.java:298)
at org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.doStartTag(QueryTagSupport.java:181)
at org.apache.jsp.test_jsp._jspx_meth_sql_005fquery_005f0(test_jsp.java:110)
at org.apache.jsp.test_jsp._jspService(test_jsp.java:63)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:857)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:565)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509)
at java.lang.Thread.run(Thread.java:662)
so what is the solution how to create datasource on apche server which suitable for adf application?
when i test data source using following code used 1. way as i mentioned above its running fine bt not for second.
<%@ taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<sql:query var="rs" dataSource="jdbc/TestDB">
select empname from pay_emphdr where empcd='JK1306'
</sql:query>
<html>
<head>
    <title>DB Test</title>
</head>
<body>
<h2>Results</h2>
<c:forEach var="row" items="${rs.rows}">
    Foo ${row.empname}<br/>
</c:forEach>
</body>
</html>
please help me. it is very urgent.
thanks in Advance
Manish

Hi Lindalnci
i have already tried this tutorial and in my post i have defined first way to do using this procedure.
in that case i have got following exception as i have mentioned above
org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper cannot be cast to oracle.jdbc.OracleConnection

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