Issue in rotation in OpenGL

Question

What i am trying to do is as follows,, I have a client area, (0,0), (1,0),, and i'm drawing a quadilateral from (-1.5,-1.5) to (1.5,1.5) so that even if we rotate the quad, the client area always stays covered with the quad. The GlRotated() function rotates the quad using top left point (in this case -1.5,-1.5) as pivot point is there any way that we can rotate the quad using client area's center point (i.e. 0.5,0.5) as the pivot point for rotation of quad ..

Answer 1

What you could do is glTranslate the quad into the client area's center point and then glRotate. Which will effectively leave the quads pivot in the client areas center.