glRectfv man page on DigitalUNIX

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glRect(3G)							    glRect(3G)

       glRect,	glRectd, glRectf, glRecti, glRects, glRectdv, glRectfv, glRec‐
       tiv, glRectsv - draw a rectangle

       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 );

       Specify one vertex of a rectangle.  Specify the opposite vertex of  the

       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 );

       Specifies  a pointer to one vertex of a rectangle.  Specifies a pointer
       to the opposite vertex of the rectangle.

       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.

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

       glBegin(3), glVertex(3)


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