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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
2 | <!-- saved from url=(0013)about:internet --> | |
3 | <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>gluTessEndPolygon</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="gluTessEndPolygon"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>gluTessEndPolygon — delimit a polygon description</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">gluTessEndPolygon</b>(</code></td><td>GLUtesselator* </td><td><var class="pdparam">tess</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>tess</code></em></span></dt><dd><p> | |
4 | Specifies the tessellation object (created with <a class="citerefentry" href="gluNewTess.xml"><span class="citerefentry"><span class="refentrytitle">gluNewTess</span></span></a>). | |
5 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
6 | <a class="citerefentry" href="gluTessBeginPolygon.xml"><span class="citerefentry"><span class="refentrytitle">gluTessBeginPolygon</span></span></a> and <code class="function">gluTessEndPolygon</code> delimit the | |
7 | definition of a convex, concave, or self-intersecting polygon. Within | |
8 | each <a class="citerefentry" href="gluTessBeginPolygon.xml"><span class="citerefentry"><span class="refentrytitle">gluTessBeginPolygon</span></span></a>/<code class="function">gluTessEndPolygon</code> pair, there must be | |
9 | one or more calls to <a class="citerefentry" href="gluTessBeginContour.xml"><span class="citerefentry"><span class="refentrytitle">gluTessBeginContour</span></span></a>/<a class="citerefentry" href="gluTessEndContour.xml"><span class="citerefentry"><span class="refentrytitle">gluTessEndContour</span></span></a>. | |
10 | Within each contour, there are zero or more calls to <a class="citerefentry" href="gluTessVertex.xml"><span class="citerefentry"><span class="refentrytitle">gluTessVertex</span></span></a>. | |
11 | The vertices specify a closed contour (the last vertex of each contour | |
12 | is automatically linked to the first). See the <a class="citerefentry" href="gluTessVertex.xml"><span class="citerefentry"><span class="refentrytitle">gluTessVertex</span></span></a>, | |
13 | <a class="citerefentry" href="gluTessBeginContour.xml"><span class="citerefentry"><span class="refentrytitle">gluTessBeginContour</span></span></a>, and <a class="citerefentry" href="gluTessEndContour.xml"><span class="citerefentry"><span class="refentrytitle">gluTessEndContour</span></span></a> reference pages for | |
14 | more details. | |
15 | </p><p> | |
16 | Once <code class="function">gluTessEndPolygon</code> is called, the polygon is tessellated, and the | |
17 | resulting triangles are described through callbacks. | |
18 | See <a class="citerefentry" href="gluTessCallback.xml"><span class="citerefentry"><span class="refentrytitle">gluTessCallback</span></span></a> for descriptions of the callback functions. | |
19 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="example"></a><h2>Example</h2><p> | |
20 | A quadrilateral with a triangular hole in it can be described like this: | |
21 | </p><pre class="programlisting"> | |
22 | gluTessBeginPolygon(tobj, NULL); | |
23 | gluTessBeginContour(tobj); | |
24 | gluTessVertex(tobj, v1, v1); | |
25 | gluTessVertex(tobj, v2, v2); | |
26 | gluTessVertex(tobj, v3, v3); | |
27 | gluTessVertex(tobj, v4, v4); | |
28 | gluTessEndContour(tobj); | |
29 | gluTessBeginContour(tobj); | |
30 | gluTessVertex(tobj, v5, v5); | |
31 | gluTessVertex(tobj, v6, v6); | |
32 | gluTessVertex(tobj, v7, v7); | |
33 | gluTessEndContour(tobj); | |
34 | gluTessEndPolygon(tobj); | |
35 | </pre><p> | |
36 | In the above example the pointers, | |
37 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v1</mml:mi></mml:math> | |
38 | through | |
39 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v7</mml:mi></mml:math>, | |
40 | should point to different | |
41 | addresses, | |
42 | since the values stored at these addresses will not be read by | |
43 | the tesselator until <code class="function">gluTessEndPolygon</code> is called. | |
44 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
45 | <a class="citerefentry" href="gluNewTess.xml"><span class="citerefentry"><span class="refentrytitle">gluNewTess</span></span></a>, | |
46 | <a class="citerefentry" href="gluTessBeginContour.xml"><span class="citerefentry"><span class="refentrytitle">gluTessBeginContour</span></span></a>, | |
47 | <a class="citerefentry" href="gluTessBeginPolygon.xml"><span class="citerefentry"><span class="refentrytitle">gluTessBeginPolygon</span></span></a>, | |
48 | <a class="citerefentry" href="gluTessCallback.xml"><span class="citerefentry"><span class="refentrytitle">gluTessCallback</span></span></a>, | |
49 | <a class="citerefentry" href="gluTessNormal.xml"><span class="citerefentry"><span class="refentrytitle">gluTessNormal</span></span></a>, | |
50 | <a class="citerefentry" href="gluTessProperty.xml"><span class="citerefentry"><span class="refentrytitle">gluTessProperty</span></span></a>, | |
51 | <a class="citerefentry" href="gluTessVertex.xml"><span class="citerefentry"><span class="refentrytitle">gluTessVertex</span></span></a> | |
52 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
53 | Copyright <span class="trademark"></span>© 1991-2006 | |
54 | Silicon Graphics, Inc. This document is licensed under the SGI | |
55 | Free Software B License. For details, see | |
56 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
57 | </p></div></div></body></html> |