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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title></title>
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<meta name="author" content="Guido Laures">
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<link href="cewolf.css" rel="stylesheet" type="text/css">
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</head>
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<body>
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<h1><a name="Developer Guido">Developer Guide</a></h1>
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<p> Let us assume the following (standard) scenario in which Cewolf
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might be a solution.<br>
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You have a running web application and you want to know which pages are
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most visited by your users. You want to have a vertical bar chart which
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looks like the one below </p>
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<p> <img src="img/guidevbarchart.gif" alt="verticalbar"> </p>
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<p> </p>
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<h2>1. Prepare Your Application</h2>
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<p> If you have not yet downloaded the Cewolf distribution, this is the
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point when you should do it (look at <a
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href="http://sourceforge.net/project/showfiles.php?group_id=57282"
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target="new">Download</a>). Put the <tt>cewolf.jar</tt> file into your
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web application's <tt>/WEB-INF/lib</tt> directory.<br>
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That should be all you have to do to prepare your application for
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Cewolf usage. If you encounter any problems in using the Cewolf tags
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(e.g. "No Tags" is displayed in your containers console) you can
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additionally put the <tt>cewolf.tld</tt> file from the distribution's <tt>etc</tt>
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directory into a directory of your choice under your web application's
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root and reference this file as the cewolf tag library from your JSPs. </p>
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<h2>2. Provide a DatasetProducer</h2>
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<p> As Cewolf uses a MVC (Model-View-Control) approach the data which
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are shown in your chart are separated from the view defined in the JSP
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page. So you can change them separately. To provide the chart with the
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correct data you must provide an object which implements the interface<tt>de.laures.cewolf.DatasetProducer</tt>.
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This object is asked to produce data every time a chart is rendered.
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Below you see an implementation of a DatasetProducer which could be used
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to provide data needed for our example scenario. </p>
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<p> </p>
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to be continued ...
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<h2>3. Install the Cewolf Servlet in your Web App</h2>
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tbd.
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<h2>4. Define the chart in your JSP</h2>
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<pre><%@page contentType="text/html"%><br><%@taglib uri='/WEB-INF/cewolf.tld' prefix='cewolf' %><br><jsp:useBean id="pageViews" class="de.laures.cewolf.example.PageViewCountData"/><br><cewolf:chart <br> id="horizontalBarChart" <br> title="HorizontalBarChart" <br> renderer="servlet/chart" <br> width="300" height="300" <br> type="horizontalBar" <br> xAxisLabel="Page" <br> yAxisLabel="Views"><br> <cewolf:data producer="pageViews" /><br></cewolf:chart><br></pre>
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<p> <a href="http://sourceforge.net" target="new" height="30"><img
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src="http://sourceforge.net/sflogo.php?group_id=57282&type=5"
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height="30" border="0" alt="SourceForge Logo"></a> </p>
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</body>
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</html>
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