[linux-audio-dev] Programming Synth Knobs?

Does anyone know a good way to write code that renders synth knobs/potis/controllers?
I was looking around to rotate an image which only worked in opengl...
Creating a circle took too much time in sdl.
Thanks for your help.
grtz Scar

-- 
It is now quite lawful for a Catholic woman to avoid pregnancy by a resort to
mathematics, though she is still forbidden to resort to physics and chemistry.
		-- H.L. Mencken