Advanced
Horizontal Bar Graph, version 3.2
by Sirius Computer Consultants Limited
Applet
Example 4
The
applet is setup here to read the configuration data from
a text file and the graph data from a server side process,
in this case a Java Servlet running on our web server.
and
here is the HTML code,
<applet
code="VbarchartApplet.class" archive="Vbargraph.jar"
width="500" height="420">
<!--
Start Up Parameters -->
<PARAM name="LOADINGMESSAGE" value="Column
Chart Loading - Please Wait.">
<PARAM name="STEXTCOLOR" value="0,0,100">
<!-- Message Text Color-->
<PARAM name="STARTUPCOLOR" value="255,255,255">
<!-- Applet Background color -->
<!--
Data files -->
<PARAM name="chartproperties" value="barprops.txt">
<PARAM name="chartdata" value="http://www.jpowered.com/siriusjava/servlet/DataServlet">
</applet>
The DataServlet
( click here
to view code ) is a simple servlet designed to demonstrate
how a servlet can be used to return data to either the graphing
applet or servlet. As you will see the main routine ( doGet()
) uses the method GraphData() to construct the return data.
Although in this example the GraphData() routine simply builds
the return data from 'hard coded' values, in practice this
routine would be expanded to first gather data from any number
of datasources. eg. databases, files other server processes.
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