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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>gluDisk</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="gluDisk"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>gluDisk — draw a disk</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">gluDisk</b>(</code></td><td>GLUquadric* </td><td><var class="pdparam">quad</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">inner</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">outer</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">slices</var>, </td></tr><tr><td> </td><td>GLint </td><td><var class="pdparam">loops</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>quad</code></em></span></dt><dd><p> | |
4 | Specifies the quadrics object (created with <a class="citerefentry" href="gluNewQuadric.xml"><span class="citerefentry"><span class="refentrytitle">gluNewQuadric</span></span></a>). | |
5 | </p></dd><dt><span class="term"><em class="parameter"><code>inner</code></em></span></dt><dd><p> | |
6 | Specifies the inner radius of the disk (may be 0). | |
7 | </p></dd><dt><span class="term"><em class="parameter"><code>outer</code></em></span></dt><dd><p> | |
8 | Specifies the outer radius of the disk. | |
9 | </p></dd><dt><span class="term"><em class="parameter"><code>slices</code></em></span></dt><dd><p> | |
10 | Specifies the number of subdivisions around the <span class="emphasis"><em>z</em></span> axis. | |
11 | </p></dd><dt><span class="term"><em class="parameter"><code>loops</code></em></span></dt><dd><p> | |
12 | Specifies the number of concentric rings about the origin into which | |
13 | the disk is subdivided. | |
14 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
15 | <code class="function">gluDisk</code> renders a disk on the <span class="emphasis"><em>z</em></span> = 0 plane. The disk has a radius of | |
16 | <em class="parameter"><code>outer</code></em> and contains a concentric circular hole with a radius | |
17 | of <em class="parameter"><code>inner</code></em>. If <em class="parameter"><code>inner</code></em> is 0, then no hole is generated. The disk is | |
18 | subdivided around the <span class="emphasis"><em>z</em></span> axis into slices (like pizza slices) and also | |
19 | about the <span class="emphasis"><em>z</em></span> axis into rings | |
20 | (as specified by <em class="parameter"><code>slices</code></em> and <em class="parameter"><code>loops</code></em>, respectively). | |
21 | </p><p> | |
22 | With respect to orientation, the +<span class="emphasis"><em>z</em></span> side of the disk is considered to be | |
23 | ``outside'' (see <a class="citerefentry" href="gluQuadricOrientation.xml"><span class="citerefentry"><span class="refentrytitle">gluQuadricOrientation</span></span></a>). | |
24 | This means that if the | |
25 | orientation is set to <code class="constant">GLU_OUTSIDE</code>, then any normals generated | |
26 | point along the +<span class="emphasis"><em>z</em></span> axis. Otherwise, they point along the \-<span class="emphasis"><em>z</em></span> | |
27 | axis. | |
28 | </p><p> | |
29 | If texturing has been turned on (with <a class="citerefentry" href="gluQuadricTexture.xml"><span class="citerefentry"><span class="refentrytitle">gluQuadricTexture</span></span></a>), | |
30 | texture coordinates are generated | |
31 | linearly such that where | |
32 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
33 | ||
34 | <mml:mrow> | |
35 | <mml:mi mathvariant="italic">r</mml:mi> | |
36 | <mml:mo>=</mml:mo> | |
37 | <mml:mi mathvariant="italic">outer</mml:mi> | |
38 | </mml:mrow> | |
39 | </mml:math>, | |
40 | the value at (<span class="emphasis"><em>r</em></span>, 0, 0) is | |
41 | (1, 0.5), at (0, <span class="emphasis"><em>r</em></span>, 0) it is (0.5, 1), at (\-<span class="emphasis"><em>r</em></span>, 0, 0) | |
42 | it is (0, 0.5), and | |
43 | at (0, \-<span class="emphasis"><em>r</em></span>, 0) it is (0.5, 0). | |
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="gluCylinder.xml"><span class="citerefentry"><span class="refentrytitle">gluCylinder</span></span></a>, | |
46 | <a class="citerefentry" href="gluNewQuadric.xml"><span class="citerefentry"><span class="refentrytitle">gluNewQuadric</span></span></a>, | |
47 | <a class="citerefentry" href="gluPartialDisk.xml"><span class="citerefentry"><span class="refentrytitle">gluPartialDisk</span></span></a>, | |
48 | <a class="citerefentry" href="gluQuadricOrientation.xml"><span class="citerefentry"><span class="refentrytitle">gluQuadricOrientation</span></span></a>, | |
49 | <a class="citerefentry" href="gluQuadricTexture.xml"><span class="citerefentry"><span class="refentrytitle">gluQuadricTexture</span></span></a>, | |
50 | <a class="citerefentry" href="gluSphere.xml"><span class="citerefentry"><span class="refentrytitle">gluSphere</span></span></a> | |
51 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
52 | Copyright <span class="trademark"></span>© 1991-2006 | |
53 | Silicon Graphics, Inc. This document is licensed under the SGI | |
54 | Free Software B License. For details, see | |
55 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
56 | </p></div></div></body></html> |