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<h2 class="chapter">6 External Modules</h2>
<p>An external module is a program that interacts with Geomview. A
module communicates with Geomview through GCL and can
control any apsect of Geomview that you can control through Geomview's
user interface.
<p>In many cases an external module is a specialized program that
implements some mathematical algorithm that creates a geometric
object that changes shape as the algorithm progresses. The module
informs Geomview of the new object shape at each step, so the object
appears to evolve with time in the Geomview window. In this way
Geomview serves as a <em>display engine</em> for the module.
<p>An external module may be interactive. It can respond to mouse and
keyboard events that take place in a Geomview window, thus extending
the capability of Geomview itself.
<ul class="menu">
<li><a accesskey="1" href="Interface.html#Interface">Interface</a>: How External Modules Interface with Geomview.
<li><a accesskey="2" href="Example1.html#Example1">Example1</a>: Simple External Module.
<li><a accesskey="3" href="Example2.html#Example2">Example2</a>: Simple External Module with FORMS Control Panel.
<li><a accesskey="4" href="XForms.html#XForms">XForms</a>: The XForms library.
<li><a accesskey="5" href="Example3.html#Example3">Example3</a>: External Module with Bi-Directional Communication.
<li><a accesskey="6" href="Example4.html#Example4">Example4</a>: Simple Tcl/Tk Module Demonstrating Picking.
<li><a accesskey="7" href="Module-Installation.html#Module-Installation">Module Installation</a>: Module Installation.
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