HP b2600

R
glRect
Chapter 16
385
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 counter-clockwise winding.
Errors
• GL_INVALID_OPERATION is generatedif glRect is executedbetween the execution
of glBegin and the corresponding execution of glEnd.
See Also
glBegin,
glVertex