_C_ License Applicability. Except to the extent portions of this file are
_C_ made subject to an alternative license as permitted in the SGI Free
_C_ Software License B, Version 1.1 (the "License"), the contents of this
_C_ file are subject only to the provisions of the License. You may not use
_C_ this file except in compliance with the License. You may obtain a copy
_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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_C_ 
_C_ http://oss.sgi.com/projects/FreeB
_C_ 
_C_ Note that, as provided in the License, the Software is distributed on an
_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
_C_ 
_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
_C_ Copyright in any portions created by third parties is as indicated
_C_ elsewhere herein. All Rights Reserved.
_C_ 
_C_ Additional Notice Provisions: The application programming interfaces
_C_ established by SGI in conjunction with the Original Code are The
_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
_C_ published by SGI, but has not been independently verified as being
_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
_C_
_C_ The first character in this file must be an '_'!
_C_ Anything on a line after _C_ is ignored
_define(_filters,eqn)_C_
_header(Rect,draw a rectangle)
_names(Rect,[dfis])
.SH PARAMETERS
_phead(_param1 _param2)
Specify one vertex of a rectangle.
_phead(_param3 _param4)
Specify the opposite vertex of the rectangle.
_names(Rect,[dfis]v)
.BP
.SH PARAMETERS
_phead(_param1)
Specifies a pointer to one vertex of a rectangle.
_phead(_param2)
Specifies a pointer to the opposite vertex of the rectangle.
.SH DESCRIPTION
_cmnd supports efficient specification of rectangles as two corner points.
Each 
rectangle command takes four arguments,
organized either as two consecutive pairs of (\f2x\fP,\f2y\fP) coordinates,
or as two pointers to arrays,
each containing an (\f2x\fP,\f2y\fP) pair.
The resulting rectangle is defined in the \f2z\fP = 0 plane.
.P
_cmnd(Rect)(_param1(1), _param2(1), _param3(1), _param4(1))
is exactly equivalent to the following sequence:
.Ex 6
glBegin(_const(POLYGON));
glVertex2(_param1(1), _param2(1));
glVertex2(_param3(1), _param2(1));
glVertex2(_param3(1), _param4(1));
glVertex2(_param1(1), _param4(1));
glEnd();
.Ee
Note that if the second vertex is above and to the right of the first vertex,
the rectangle is constructed with a counterclockwise winding.
.SH ERRORS
_const(INVALID_OPERATION) is generated if _cmnd
is executed between the execution of _cmnd(Begin)
and the corresponding execution of _cmnd(End).
.SH SEE ALSO
_cmnd(Begin),
_cmnd(Vertex)