Better way to create a complex radial gradient?

hm, i'm newb at jitter... but maybe it is just a matter of having the gradient circle finishing off the edges of your pwindow ? then you have a screen filled with this circle, only not full, but it's all radient, and you relocate your circle so that its center matches your window center, though in your patch i have no clue as to how you could... diminish the size of your circles in order to make appear an infinite number of gradient circles that way... that's all i can help, but surely the solution is somewher around the edges :)