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