I’ve got a 640x480 window that has symbols drawn on it (circles, crosshairs, etc.). All of the symbols are centered around 320, 280. I’ve been using glRotatef like this:
glRotatef( angle, 0.0, 0.0, 1.0 );
-draw all the symbols
It’s definitely doing a rotation about the z-axis, but it’s rotating everything around the lower left corner of the window.
How do I get everything to rotate around 320,280?