diff -r 000000000000 -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

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.

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.

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%).

+ + + + + + + + + + + + + + + + + + + +
Fully free and open 100% Java compliant
+
+
LGPL license
+
no charges
+
no restrictions
+
Support on SourceForge Forums
+
short development and upgrade circles
+
+ +
+
no usage of native libraries
+
should run in every J2EE compliant server or servlet +container
+
extensive usage of available open source projects
+
+
Full featured Chart Tag Library Huge number of different Charts
+
+
no java coding inside the JSP needed
+
XML description of a chart
+
design time validation of chart tags
+
extensive tag documentation
+
+ +
+
Line [XY]
+
[3D] Pie
+
[3D] Horizonal Bar
+
[3D] Vertical [XY] Bar
+
[3D] Stacked Vertical Bar
+
Area [XY]
+
Scatter Plot
+
Candlestick
+
High Low
+
Gantt
+
Meter
+
Overlaid
+
Combined
+
+
+

Fully free and open	100% Java compliant
+ + LGPL license + no charges + no restrictions + Support on SourceForge Forums + short development and upgrade circles + +	+ + no usage of native libraries + should run in every J2EE compliant server or servlet +container + extensive usage of available open source projects + +
Full featured Chart Tag Library	Huge number of different Charts
+ + no java coding inside the JSP needed + XML description of a chart + design time validation of chart tags + extensive tag documentation + +	+ + Line [XY] + [3D] Pie + [3D] Horizonal Bar + [3D] Vertical [XY] Bar + [3D] Stacked Vertical Bar + Area [XY] + Scatter Plot + Candlestick + High Low + Gantt + Meter + Overlaid + Combined + +

Example

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:

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.

+ +