You can easily put some instance variable in a sprite for the 2D position (=where are the element in the circle). And in that matter, options like angle, speed, etc are the easiest part.
The problem is, even if you know where each element is, you will have to project their position to know where to display them in screen space. And what will be their size.
The screen X,Y position and size are values that depends on the position of the viewer (camera) and the Field Of View (how much things shrink with distance).
That's more or less 3D projection for you.Yann2011-12-12 13:26:48