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Name

glRect — draw a rectangle

C Specification

void glRectd(GLdouble  x1,
 GLdouble  y1,
 GLdouble  x2,
 GLdouble  y2);
void glRectf(GLfloat  x1,
 GLfloat  y1,
 GLfloat  x2,
 GLfloat  y2);
void glRecti(GLint  x1,
 GLint  y1,
 GLint  x2,
 GLint  y2);
void glRects(GLshort  x1,
 GLshort  y1,
 GLshort  x2,
 GLshort  y2);

Parameters

x1, y1

Specify one vertex of a rectangle.

x2, y2

Specify the opposite vertex of the rectangle.

C Specification

void glRectdv(const GLdouble *  v1,
 const GLdouble *  v2);
void glRectfv(const GLfloat *  v1,
 const GLfloat *  v2);
void glRectiv(const GLint *  v1,
 const GLint *  v2);
void glRectsv(const GLshort *  v1,
 const GLshort *  v2);

Parameters

v1

Specifies a pointer to one vertex of a rectangle.

v2

Specifies a pointer to the opposite vertex of the rectangle.

Description

glRect supports efficient specification of rectangles as two corner points. Each rectangle command takes four arguments, organized either as two consecutive pairs of x y coordinates or as two pointers to arrays, each containing an x y pair. The resulting rectangle is defined in the z = 0 plane.

glRect(x1, y1, x2, y2) is exactly equivalent to the following sequence: 

glBegin(GL_POLYGON);
glVertex2(x1, y1);
glVertex2(x2, y1);
glVertex2(x2, y2);
glVertex2(x1, y2);
glEnd();

Note that if the second vertex is above and to the right of the first vertex, the rectangle is constructed with a counterclockwise winding.

Errors

GL_INVALID_OPERATION is generated if glRect is executed between the execution of glBegin and the corresponding execution of glEnd.

See Also

glBegin, glVertex

Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.