diff -r 1612dbcec451 -r 639991d0808a java/cewolf-1.0/src/site/brief.html --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/java/cewolf-1.0/src/site/brief.html Sat Feb 28 21:31:02 2009 +0100 @@ -0,0 +1,104 @@ + + + + + + + + +

Introduction

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Cewolf can be used inside a Servlet/JSP based web +application to embed complex graphical charts of all kinds (e.g. line, +pie, bar chart, plots, etc.) into a web page. Therefore it provides a +full featured tag library to define all properties of the chart (colors, +strokes, legend, etc.). Thus the JSP which embedds the chart is not +polluted with any java code. Everything is described with XML conform +tags.

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Cewolf is based on JFreeChart and +uses it's rendering engine to render the final chart image into the +clients response stream. No files are created on server side. Everything +is based on lightweight session objects and dynamic data analysis. +Cewolf consists of one servlet which handles the chart rendering and a +taglibrary which translates the chart definition included in the JSP +into an HTML img tag which consults the rendering servlet for retrieval +of the appropriate chart.

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Simce the project has been funded in the middle of 2002 there have +been more then 150.000 page views and 16.000 downloads +(Sourceforge activity max: >99,7%).

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Fully free and open100% Java compliant
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  • LGPL license
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  • no charges
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  • no restrictions
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  • Support on SourceForge Forums
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  • short development and upgrade circles
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  • no usage of native libraries
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  • should run in every J2EE compliant server or servlet +container
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  • extensive usage of available open source projects
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Full featured Chart Tag LibraryHuge number of different Charts
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  • no java coding inside the JSP needed
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  • XML description of a chart
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  • design time validation of chart tags
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  • extensive tag documentation
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  • Line [XY]
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  • [3D] Pie
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  • [3D] Horizonal Bar
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  • [3D] Vertical [XY] Bar
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  • [3D] Stacked Vertical Bar
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  • Area [XY]
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  • Scatter Plot
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  • Candlestick
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  • High Low
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  • Gantt
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  • Meter
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  • Overlaid
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  • Combined
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+

Example

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You can simply define a chart by including a chart tag into your JSP +like this:

+
<cewolf:chart 
id="XYChart"
type="xy"
title="XYChart"
<cewolf:gradient>
<cewolf:point x="0" y="0" color="#FFFFFF"/>
<cewolf:point x="0" y="300" color="#C8C8C8"/>
</cewolf:gradient>
<cewolf:data>
<cewolf:producer id="xyData"/>
</cewolf:data>
</cewolf:chart>
<cewolf:img chartid="XYChart" renderer="cewolf" width="400" height="300"/>
+

This results in a rendered chart like this:

+examplechart +

As you can see only the view is defined in the JSP page. The model +is produced by a so called DataProducer which must be available in the +pageContext of the JSP.

+SourceForge Logo + +