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201 lines
8.5 KiB
XML
201 lines
8.5 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="glRect">
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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>glRect</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glRect</refname>
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<refpurpose>draw a rectangle</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>glRectd</function></funcdef>
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<paramdef>GLdouble <parameter>x1</parameter></paramdef>
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<paramdef>GLdouble <parameter>y1</parameter></paramdef>
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<paramdef>GLdouble <parameter>x2</parameter></paramdef>
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<paramdef>GLdouble <parameter>y2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glRectf</function></funcdef>
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<paramdef>GLfloat <parameter>x1</parameter></paramdef>
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<paramdef>GLfloat <parameter>y1</parameter></paramdef>
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<paramdef>GLfloat <parameter>x2</parameter></paramdef>
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<paramdef>GLfloat <parameter>y2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glRecti</function></funcdef>
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<paramdef>GLint <parameter>x1</parameter></paramdef>
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<paramdef>GLint <parameter>y1</parameter></paramdef>
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<paramdef>GLint <parameter>x2</parameter></paramdef>
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<paramdef>GLint <parameter>y2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glRects</function></funcdef>
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<paramdef>GLshort <parameter>x1</parameter></paramdef>
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<paramdef>GLshort <parameter>y1</parameter></paramdef>
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<paramdef>GLshort <parameter>x2</parameter></paramdef>
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<paramdef>GLshort <parameter>y2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>x1</parameter></term>
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<term><parameter>y1</parameter></term>
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<listitem>
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<para>
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Specify one vertex of a rectangle.
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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>x2</parameter></term>
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<term><parameter>y2</parameter></term>
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<listitem>
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<para>
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Specify the opposite vertex of the rectangle.
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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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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glRectdv</function></funcdef>
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<paramdef>const GLdouble * <parameter>v1</parameter></paramdef>
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<paramdef>const GLdouble * <parameter>v2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glRectfv</function></funcdef>
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<paramdef>const GLfloat * <parameter>v1</parameter></paramdef>
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<paramdef>const GLfloat * <parameter>v2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glRectiv</function></funcdef>
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<paramdef>const GLint * <parameter>v1</parameter></paramdef>
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<paramdef>const GLint * <parameter>v2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glRectsv</function></funcdef>
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<paramdef>const GLshort * <parameter>v1</parameter></paramdef>
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<paramdef>const GLshort * <parameter>v2</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters2"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>v1</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to one vertex of a rectangle.
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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>v2</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to the opposite vertex of the rectangle.
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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>glRect</function> supports efficient specification of rectangles as two corner points.
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Each
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rectangle command takes four arguments,
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organized either as two consecutive pairs of
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<inlineequation><mml:math>
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<!-- eqn: (x,y):-->
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<mml:mfenced open="(" close=")">
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<mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">y</mml:mi>
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</mml:mfenced>
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</mml:math></inlineequation>
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coordinates
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or as two pointers to arrays,
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each containing an
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<inlineequation><mml:math>
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<!-- eqn: (x,y):-->
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<mml:mfenced open="(" close=")">
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<mml:mi mathvariant="italic">x</mml:mi>
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<mml:mi mathvariant="italic">y</mml:mi>
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</mml:mfenced>
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</mml:math></inlineequation>
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pair.
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The resulting rectangle is defined in 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.
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</para>
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<para>
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<function>glRect</function>(<parameter>x1</parameter>, <parameter>y1</parameter>, <parameter>x2</parameter>, <parameter>y2</parameter>)
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is exactly equivalent to the following sequence:
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<programlisting>
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glBegin(<constant>GL_POLYGON</constant>);
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glVertex2(<parameter>x1</parameter>, <parameter>y1</parameter>);
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glVertex2(<parameter>x2</parameter>, <parameter>y1</parameter>);
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glVertex2(<parameter>x2</parameter>, <parameter>y2</parameter>);
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glVertex2(<parameter>x1</parameter>, <parameter>y2</parameter>);
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glEnd();
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</programlisting>
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Note that if the second vertex is above and to the right of the first vertex,
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the rectangle is constructed with a counterclockwise winding.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glRect</function>
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is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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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>glBegin</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glVertex</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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