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<title>ploticus: controlling ploticus from other programs (automation)</title>
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<td><br><h2>controlling ploticus from other programs (automation)</h2></td>
<td align=right>
<small>
<a href="../doc/Welcome.html"><img src="../doc/ploticus.gif" border=0></a><br>
<a href="../doc/Welcome.html">Welcome</a>
<a href="../gallery/index.html">Gallery</a>
<a href="../doc/Contents.html">Handbook</a>
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<br>
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<title>Manual page for controlling_ploticus_from_other_programs_(automation)(PL)</title>
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<h2>DESCRIPTION</h2>
Notes on executing ploticus under the control of another program
in an automated way.<tt> </tt>
<h2>STRATEGY</h2>
<p>
As of version 2.00, pl can be
<a href="cgi.html">
directly invoked as a CGI program
</a>
<p>
A
<a href="../download/ploticus.perl">
perl script
</a>
which implements a web interface to ploticus was
contributed by Tom McClure.<tt> </tt>
<p>
Since it is a command-line program,
<b>ploticus</b> can easily be invoked by other programs
automatically for unattended use.<tt> </tt>
For instance, web server CGI scripts can invoke <b>pl</b>
to build PNG or GIF data displays on demand. Or <b>pl</b> may be invoked
by <b>cron</b> to produce plots on a regular basis.<tt> </tt>
<p>
The invoking program can build a ploticus script on the fly,
or use one that has been created in advance.<tt> </tt>
<p>
The actual invocation can be done using the equivalent of
<tt>system()</tt>. For example, in C:
<dl>
<dt><dd><p>
<tt>system( "pl -gif myfile.p ITEM=hgxz" );</tt>
</dl>
<h2>VARIABLES</h2>
Variables may be useful for implementation of
changeable paramters (the invoking program
would execute <b>pl</b> and set variables
on the command line).<tt> </tt>
For example:
<p>
<tt>pl -gif status.p STARTDATE=010198 ENDDATE=062699 GROUP=hgc</tt>
<br>
<br>
</td></tr>
<td align=right>
<a href="Welcome.html">
<img src="../doc/ploticus.gif" border=0></a><br><small>data display engine <br>
<a href="../doc/Copyright.html">Copyright Steve Grubb</a>
<br>
<br>
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<img src="../gallery/all.gif">
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<p><hr>
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