glRectd function

The glRectd function draws a rectangle.

Syntax

void WINAPI glRectd(
   GLdouble x1,
   GLdouble y1,
   GLdouble x2,
   GLdouble y2
);

Parameters

x1

The x coordinate of the vertex of a rectangle.

y1

The y coordinate of the vertex of a rectangle.

x2

The x coordinate of the opposite vertex of the rectangle.

y2

The y coordinate of the opposite vertex of the rectangle.

Return value

This function does not return a value.

Error codes

The following error code can be retrieved by the glGetError function.

Name Meaning
GL_INVALID_OPERATION
The function was called between a call to glBegin and the corresponding call to glEnd.

Remarks

The glRectd function 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.

The glRectd(x1, y1, x2, y2) function is exactly equivalent to the following sequence:

glBegin(GL_POLYGON);

glVertex2( x1, y1 );

glVertex2( x2, y1 );

glVertex2( x2, y2 );

glVertex2( x1, y2 );

glEnd( );

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

Requirements

Requirement Value
Minimum supported client
Windows 2000 Professional [desktop apps only]
Minimum supported server
Windows 2000 Server [desktop apps only]
Header
Gl.h
Library
Opengl32.lib
DLL
Opengl32.dll

See also

glBegin

glEnd

glVertex