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Chapters:
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<a href="Introduction.html">1: Introduction</a><br>
<a href="SimpleExample.html">2: Simple example</a><br>
<a href="InvokingGri.html">3: Invocation</a><br>
<a href="GettingMoreControl.html">4: Finer Control</a><br>
<a href="X-Y.html">5: X-Y Plots</a><br>
<a href="ContourPlots.html">6: Contour Plots</a><br>
<a href="Images.html">7: Image Plots</a><br>
<a href="Examples.html">8: Examples</a><br>
<a href="Commands.html">9: Gri Commands</a><br>
<a href="Programming.html">10: Programming</a><br>
<a href="Environment.html">11: Environment</a><br>
<a href="Emacs.html">12: Emacs Mode</a><br>
<a href="History.html">13: History</a><br>
<a href="Installation.html">14: Installation</a><br>
<a href="Bugs.html">15: Gri Bugs</a><br>
<a href="TestSuite.html">16: Test Suite</a><br>
<a href="GriInThePress.html">17: Gri in Press</a><br>
<a href="Acknowledgments.html">18: Acknowledgments</a><br>
<a href="License.html">19: License</a><br>
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Indices:<br>
<a href="ConceptIndex.html"><i>Concepts</i></a><br>
<a href="CommandIndex.html"><i>Commands</i></a><br>
<a href="BuiltinIndex.html"><i>Variables</i></a><br>
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<h3>10.11.1: Purpose of newcommands</h3>
Gri can be extended easily. Primitive commands (e.g. `<font color="#82140F"><code>set x name</code></font>')
can be supplemented with so-called "new commands." New commands are a
little like subroutines other programming languages. For example, you
might find that you often draw filled curves with a particular graylevel
(say 0.5), and then return the graylevel to the previous value. This
requires you to do the following each time:
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<font color="#82140F">
new .old_graylevel.
.old_graylevel. = ..graylevel..
set graylevel 0.5
draw curve filled to 0 y
set graylevel .old_graylevel.
delete .old_graylevel.
</font></PRE>
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<p>
This gets a bit tedious, and it would obviously be nicer to just say
something like
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<font color="#82140F">
Draw my kinda curve
</font></PRE>
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<p>
To make this shortcut, you'd tell Gri about the existence of a new
command called `<font color="#82140F"><code>Draw my kinda curve</code></font>', and tell it that the new
command can be accomplished by the longer code fragment written above.
<p>
Once you've learned how to make new commands, you are likely to use them
a lot. The following explains how you add new commands. For advice on
programming style, etc., (see <a href="ResourceFile.html#ResourceFile">Resource File</a>).
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