drawables and refresh rates

Hey guys it's been about 8 hours since my last e-mail so it's time to post again :)

Other than the gtkmm docs, are there any books or sites which have more info on using graphics in Gtk?

I have a Gdk::Drawable where I'm drawing 2 arcs. A blue circle and a red arc drawn on top of the blue circle. I've got 2 Gtk::HScale widgets using a DISCONTINUOUS_UPDATE that modify the angle and width of the red arc. On update the the blue circle is redrawn and then the red is redrawn on top of it using the values from the scale widgets. This causes some flickering on the drawing area. Is there a better way to do this?

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