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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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              "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="gluTessEndPolygon">
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    <refmeta>
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        <refmetainfo>
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            <copyright>
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                <year>1991-2006</year>
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                <holder>Silicon Graphics, Inc.</holder>
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            </copyright>
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        </refmetainfo>
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        <refentrytitle>gluTessEndPolygon</refentrytitle>
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        <manvolnum>3G</manvolnum>
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    </refmeta>
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    <refnamediv>
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        <refname>gluTessEndPolygon</refname>
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        <refpurpose>delimit a polygon description</refpurpose>
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    </refnamediv>
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    <refsynopsisdiv><title>C Specification</title>
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        <funcsynopsis>
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            <funcprototype>
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                <funcdef>void <function>gluTessEndPolygon</function></funcdef>
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                <paramdef>GLUtesselator* <parameter>tess</parameter></paramdef>
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            </funcprototype>
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        </funcsynopsis>
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    </refsynopsisdiv>
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    <!-- eqn: ignoring delim $$ -->
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    <refsect1 id="parameters"><title>Parameters</title>
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        <variablelist>
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        <varlistentry>
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            <term><parameter>tess</parameter></term>
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            <listitem>
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                <para>
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                    Specifies the tessellation object (created with <citerefentry><refentrytitle>gluNewTess</refentrytitle></citerefentry>).
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                </para>
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            </listitem>
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        </varlistentry>
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        </variablelist>
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    </refsect1>
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    <refsect1 id="description"><title>Description</title>
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        <para>
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            <citerefentry><refentrytitle>gluTessBeginPolygon</refentrytitle></citerefentry> and <function>gluTessEndPolygon</function> delimit the
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            definition of a convex, concave, or self-intersecting polygon. Within
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            each <citerefentry><refentrytitle>gluTessBeginPolygon</refentrytitle></citerefentry>/<function>gluTessEndPolygon</function> pair, there must be
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            one or more calls to <citerefentry><refentrytitle>gluTessBeginContour</refentrytitle></citerefentry>/<citerefentry><refentrytitle>gluTessEndContour</refentrytitle></citerefentry>.
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            Within each contour, there are zero or more calls to <citerefentry><refentrytitle>gluTessVertex</refentrytitle></citerefentry>.
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            The vertices specify a closed contour (the last vertex of each contour
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            is automatically linked to the first). See the <citerefentry><refentrytitle>gluTessVertex</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>gluTessBeginContour</refentrytitle></citerefentry>, and <citerefentry><refentrytitle>gluTessEndContour</refentrytitle></citerefentry> reference pages for
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            more details.
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        </para>
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        <para>
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            Once <function>gluTessEndPolygon</function> is called, the polygon is tessellated, and the
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            resulting triangles are described through callbacks.
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            See <citerefentry><refentrytitle>gluTessCallback</refentrytitle></citerefentry> for descriptions of the callback functions.
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        </para>
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    </refsect1>
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    <refsect1 id="example"><title>Example</title>
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        <para>
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            A quadrilateral with a triangular hole in it can be described like this:
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            <programlisting>
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gluTessBeginPolygon(tobj, NULL);
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   gluTessBeginContour(tobj);
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      gluTessVertex(tobj, v1, v1);
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      gluTessVertex(tobj, v2, v2);
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      gluTessVertex(tobj, v3, v3);
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      gluTessVertex(tobj, v4, v4);
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   gluTessEndContour(tobj);
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   gluTessBeginContour(tobj);
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      gluTessVertex(tobj, v5, v5);
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      gluTessVertex(tobj, v6, v6);
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      gluTessVertex(tobj, v7, v7);
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   gluTessEndContour(tobj);
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gluTessEndPolygon(tobj);
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            </programlisting>
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            In the above example the pointers,
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            <inlineequation><mml:math><mml:mi mathvariant="italic">v1</mml:mi></mml:math></inlineequation>
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            through
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            <inlineequation><mml:math><mml:mi mathvariant="italic">v7</mml:mi></mml:math></inlineequation>,
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            should point to different
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            addresses,
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            since the values stored at these addresses will not be read by
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            the tesselator until <function>gluTessEndPolygon</function> is called.
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        </para>
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    </refsect1>
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    <refsect1 id="seealso"><title>See Also</title>
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        <para>
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            <citerefentry><refentrytitle>gluNewTess</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>gluTessBeginContour</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>gluTessBeginPolygon</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>gluTessCallback</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>gluTessNormal</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>gluTessProperty</refentrytitle></citerefentry>,
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            <citerefentry><refentrytitle>gluTessVertex</refentrytitle></citerefentry>
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        </para>
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    </refsect1>
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    <refsect1 id="Copyright"><title>Copyright</title>
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        <para>
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            Copyright <trademark class="copyright"></trademark> 1991-2006
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            Silicon Graphics, Inc. This document is licensed under the SGI
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            Free Software B License. For details, see
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            <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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        </para>
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    </refsect1>
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</refentry>