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167 lines
7.4 KiB
XML
167 lines
7.4 KiB
XML
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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="gluPartialDisk">
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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>gluPartialDisk</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>gluPartialDisk</refname>
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<refpurpose>draw an arc of a disk</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>gluPartialDisk</function></funcdef>
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<paramdef>GLUquadric* <parameter>quad</parameter></paramdef>
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<paramdef>GLdouble <parameter>inner</parameter></paramdef>
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<paramdef>GLdouble <parameter>outer</parameter></paramdef>
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<paramdef>GLint <parameter>slices</parameter></paramdef>
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<paramdef>GLint <parameter>loops</parameter></paramdef>
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<paramdef>GLdouble <parameter>start</parameter></paramdef>
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<paramdef>GLdouble <parameter>sweep</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>quad</parameter></term>
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<listitem>
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<para>
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Specifies a quadrics object (created with <citerefentry><refentrytitle>gluNewQuadric</refentrytitle></citerefentry>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>inner</parameter></term>
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<listitem>
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<para>
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Specifies the inner radius of the partial disk (can be 0).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>outer</parameter></term>
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<listitem>
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<para>
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Specifies the outer radius of the partial disk.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>slices</parameter></term>
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<listitem>
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<para>
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Specifies the number of subdivisions around the <emphasis>z</emphasis> axis.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>loops</parameter></term>
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<listitem>
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<para>
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Specifies the number of concentric rings about the origin into which
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the partial disk is subdivided.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>start</parameter></term>
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<listitem>
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<para>
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Specifies the starting angle, in degrees, of the disk portion.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>sweep</parameter></term>
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<listitem>
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<para>
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Specifies the sweep angle, in degrees, of the disk portion.
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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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<function>gluPartialDisk</function> renders a partial disk on the
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<inlineequation><mml:math>
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<!-- eqn: z = 0:-->
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<mml:mrow>
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<mml:mi mathvariant="italic">z</mml:mi>
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<mml:mo>=</mml:mo>
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<mml:mn>0</mml:mn>
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</mml:mrow>
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</mml:math></inlineequation>
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plane. A partial disk is
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similar to a full disk, except that only the subset of the disk from
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<parameter>start</parameter> through <parameter>start</parameter> + <parameter>sweep</parameter> is included (where 0 degrees is along the
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+\f2y\f axis,
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90 degrees along the +<emphasis>x</emphasis> axis, 180 degrees along the \-<emphasis>y</emphasis> axis, and
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270 degrees along the \-<emphasis>x</emphasis> axis).
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</para>
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<para>
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The partial disk has a radius of
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<parameter>outer</parameter> and contains a concentric circular hole with a radius
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of <parameter>inner</parameter>. If <parameter>inner</parameter> is 0, then no hole is generated. The partial disk is
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subdivided around the <emphasis>z</emphasis> axis into slices (like pizza slices) and also
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about the <emphasis>z</emphasis> axis into rings
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(as specified by <parameter>slices</parameter> and <parameter>loops</parameter>, respectively).
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</para>
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<para>
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With respect to orientation, the +<emphasis>z</emphasis>
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side of the partial disk is considered to
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be outside (see <citerefentry><refentrytitle>gluQuadricOrientation</refentrytitle></citerefentry>).
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This means that if the
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orientation is set to <constant>GLU_OUTSIDE</constant>, then any normals generated
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point along the +<emphasis>z</emphasis> axis. Otherwise, they point along the \-<emphasis>z</emphasis>
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axis.
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</para>
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<para>
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If texturing is turned on (with <citerefentry><refentrytitle>gluQuadricTexture</refentrytitle></citerefentry>), texture
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coordinates are generated
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linearly such that where
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<inlineequation><mml:math>
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<!-- eqn: r = outer:-->
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<mml:mrow>
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<mml:mi mathvariant="italic">r</mml:mi>
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<mml:mo>=</mml:mo>
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<mml:mi mathvariant="italic">outer</mml:mi>
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</mml:mrow>
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</mml:math></inlineequation>,
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the value at (<emphasis>r</emphasis>, 0, 0) is
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(1.0, 0.5), at (0, <emphasis>r</emphasis>, 0) it is (0.5, 1.0), at (\-<emphasis>r</emphasis>, 0, 0)
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it is (0.0, 0.5), and
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at (0, \-<emphasis>r</emphasis>, 0) it is (0.5, 0.0).
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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>gluCylinder</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluDisk</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluNewQuadric</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluQuadricOrientation</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluQuadricTexture</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluSphere</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>
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