How to draw some simple picture?

["Ye Wenbin" <wenbinye gmail com>]

Hi,
I know that there is a module Gnome2::Canvas, but I'm looking for a way to
draw simple picture using Gtk2, since the Gnome2::Canvas still have no ppm.
I have read the demo script scribble.pl, but I can't learning more from the
example. I don't know how to set up a Gtk2::Gdk::Gc, how to handle
expose event, and so on. Is there more description about Gtk2::DrawingArea?
Thanks!

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Best regards,
Ye Wenbin