how to know the offset of a canvas

[dmg <dmg uvic ca>]

Hi everybody,

I have a canvas that is bigger than the window where it is displayed.

There is a function  goo_canvas_scroll_to  to scroll the canvas to a
given position.
is there an inverse of this function? Is there a way to know the coordinates
of the top/left position being displayed?

thank you!

-- 
--dmg

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Daniel M. German
http://turingmachine.org