how to get gtk to draw without waiting for an event

[William Hanlon <whanlon physics rutgers edu>]

Hi,

I would like to make a program that will draw a dot on the screen and
just make it move in a circle continuously. I've written a gtk program
that creates a drawing area and uses gdk_draw_rectangle() but nothing
is drawn until gtk_main() is executed and then of course it will not
do anything in the window until an event is detected.

How can I do this? Also I read that gdkrgb should be used but I did
not see how to do this sort of thing looking in the documentation for
gdkrgb.

Thanks for any suggestions,
Bill