Gl.Rectf (gb.opengl)
Static Sub Rectf ( X1 As Float, Y1 As Float, X2 As Float, Y2 As Float )
draw a rectangle.
Parameters
- x1, y1
-
Specify one vertex of a rectangle.
- x2, y2
-
Specify the opposite vertex of the rectangle.
Parameters
- v1
-
Specifies a pointer to one vertex of a rectangle.
- v2
-
Specifies a pointer to the opposite vertex of the rectangle.
Description
Gl.Rect supports efficient specification of rectangles as two corner points.
Each
rectangle command takes four arguments,
organized either as two consecutive pairs of
coordinates
or as two pointers to arrays,
each containing an
pair.
The resulting rectangle is defined in the
plane.
Gl.Rect(
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
Gl.Rect
is executed between the execution of Gl.Begin
and the corresponding execution of Gl.End.
See also
See original documentation on OpenGL website