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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>glScale</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glScale"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glScale — multiply the current matrix by a general scaling matrix</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">glScaled</b>(</code></td><td>GLdouble </td><td><var class="pdparam">x</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">y</var>, </td></tr><tr><td> </td><td>GLdouble </td><td><var class="pdparam">z</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glScalef</b>(</code></td><td>GLfloat </td><td><var class="pdparam">x</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">y</var>, </td></tr><tr><td> </td><td>GLfloat </td><td><var class="pdparam">z</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>x</code></em>, </span><span class="term"><em class="parameter"><code>y</code></em>, </span><span class="term"><em class="parameter"><code>z</code></em></span></dt><dd><p> | |
4 | Specify scale factors along the <span class="emphasis"><em>x</em></span>, <span class="emphasis"><em>y</em></span>, and <span class="emphasis"><em>z</em></span> axes, respectively. | |
5 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
6 | <code class="function">glScale</code> produces a nonuniform scaling along the <span class="emphasis"><em>x</em></span>, <span class="emphasis"><em>y</em></span>, and | |
7 | <span class="emphasis"><em>z</em></span> axes. | |
8 | The three parameters indicate the desired scale factor along | |
9 | each of the three axes. | |
10 | </p><p> | |
11 | The current matrix | |
12 | (see <a class="citerefentry" href="glMatrixMode.xml"><span class="citerefentry"><span class="refentrytitle">glMatrixMode</span></span></a>) | |
13 | is multiplied by this scale matrix, | |
14 | and the product replaces the current matrix | |
15 | as if <a class="citerefentry" href="glMultMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glMultMatrix</span></span></a> were called with the following matrix | |
16 | as its argument: | |
17 | </p><p> | |
18 | </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
19 | ||
20 | <mml:mfenced open="(" close=")"> | |
21 | <mml:mtable> | |
22 | <mml:mtr> | |
23 | <mml:mtd> | |
24 | <mml:mi mathvariant="italic">x</mml:mi> | |
25 | </mml:mtd> | |
26 | <mml:mtd> | |
27 | <mml:mn>0</mml:mn> | |
28 | </mml:mtd> | |
29 | <mml:mtd> | |
30 | <mml:mn>0</mml:mn> | |
31 | </mml:mtd> | |
32 | <mml:mtd> | |
33 | <mml:mn>0</mml:mn> | |
34 | </mml:mtd> | |
35 | </mml:mtr> | |
36 | <mml:mtr> | |
37 | <mml:mtd> | |
38 | <mml:mn>0</mml:mn> | |
39 | </mml:mtd> | |
40 | <mml:mtd> | |
41 | <mml:mi mathvariant="italic">y</mml:mi> | |
42 | </mml:mtd> | |
43 | <mml:mtd> | |
44 | <mml:mn>0</mml:mn> | |
45 | </mml:mtd> | |
46 | <mml:mtd> | |
47 | <mml:mn>0</mml:mn> | |
48 | </mml:mtd> | |
49 | </mml:mtr> | |
50 | <mml:mtr> | |
51 | <mml:mtd> | |
52 | <mml:mn>0</mml:mn> | |
53 | </mml:mtd> | |
54 | <mml:mtd> | |
55 | <mml:mn>0</mml:mn> | |
56 | </mml:mtd> | |
57 | <mml:mtd> | |
58 | <mml:mi mathvariant="italic">z</mml:mi> | |
59 | </mml:mtd> | |
60 | <mml:mtd> | |
61 | <mml:mn>0</mml:mn> | |
62 | </mml:mtd> | |
63 | </mml:mtr> | |
64 | <mml:mtr> | |
65 | <mml:mtd> | |
66 | <mml:mn>0</mml:mn> | |
67 | </mml:mtd> | |
68 | <mml:mtd> | |
69 | <mml:mn>0</mml:mn> | |
70 | </mml:mtd> | |
71 | <mml:mtd> | |
72 | <mml:mn>0</mml:mn> | |
73 | </mml:mtd> | |
74 | <mml:mtd> | |
75 | <mml:mn>1</mml:mn> | |
76 | </mml:mtd> | |
77 | </mml:mtr> | |
78 | </mml:mtable> | |
79 | </mml:mfenced> | |
80 | </mml:math></div><p> | |
81 | </p><p> | |
82 | If the matrix mode is either <code class="constant">GL_MODELVIEW</code> or <code class="constant">GL_PROJECTION</code>, | |
83 | all objects drawn after <code class="function">glScale</code> is called are scaled. | |
84 | </p><p> | |
85 | Use <a class="citerefentry" href="glPushMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glPushMatrix</span></span></a> and <a class="citerefentry" href="glPopMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glPopMatrix</span></span></a> to save and restore | |
86 | the unscaled coordinate | |
87 | system. | |
88 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
89 | If scale factors other than 1 are applied to the modelview matrix | |
90 | and lighting is enabled, lighting often appears wrong. | |
91 | In that case, enable automatic normalization of normals by | |
92 | calling <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a> with the argument <code class="constant">GL_NORMALIZE</code>. | |
93 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
94 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glScale</code> | |
95 | is executed between the execution of | |
96 | <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> | |
97 | and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
98 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
99 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MATRIX_MODE</code> | |
100 | </p><p> | |
101 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_COLOR_MATRIX</code> | |
102 | </p><p> | |
103 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MODELVIEW_MATRIX</code> | |
104 | </p><p> | |
105 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_PROJECTION_MATRIX</code> | |
106 | </p><p> | |
107 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_TEXTURE_MATRIX</code> | |
108 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
109 | <a class="citerefentry" href="glMatrixMode.xml"><span class="citerefentry"><span class="refentrytitle">glMatrixMode</span></span></a>, | |
110 | <a class="citerefentry" href="glMultMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glMultMatrix</span></span></a>, | |
111 | <a class="citerefentry" href="glPushMatrix.xml"><span class="citerefentry"><span class="refentrytitle">glPushMatrix</span></span></a>, | |
112 | <a class="citerefentry" href="glRotate.xml"><span class="citerefentry"><span class="refentrytitle">glRotate</span></span></a>, | |
113 | <a class="citerefentry" href="glTranslate.xml"><span class="citerefentry"><span class="refentrytitle">glTranslate</span></span></a> | |
114 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
115 | Copyright <span class="trademark"></span>© 1991-2006 | |
116 | Silicon Graphics, Inc. This document is licensed under the SGI | |
117 | Free Software B License. For details, see | |
118 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
119 | </p></div></div></body></html> |