Not yet, that sort of ring, let's say, is easy to do. My english isn't very good and I'm missing the possibility to draw something to explain. So, I'll try to better explain.
Imagine a clockwork. You have a ball that starts right in the middle of the panel and goes on, step by step, to the number one. Then a second one, starting also from the middle starts and end to number two, etc. Finally you get six of them,from number one to six of your clock. Up to that level we can manage. :-)
Now the problem is that I want to have a second rank of those balls, in the same order but within a larger circle. And then a third circle, also larger. Without losing the first and the second one.
I've tried everything, translate, push and popMatrix. I always get a result but not the one I want. I must say that the usage cos and sin are'nt too familiar to me.