[cairo] Re: Goocanvas: absolute-position animation and "update" confusion

Carl Worth cworth at cworth.org
Tue Dec 5 08:13:58 PST 2006

On Tue, 05 Dec 2006 07:35:18 -0800, Carl Worth wrote:
> Maybe all that I'm missing is a goo_canvas_item_set_position or so,
> (something like canvas_item_translate but with an absolute position
> instead of an offset).

Another reason I would want this is if I do ever want to implement
something fancy like "animate along a path" then I'll need
"set_position" primitive I can build on to implement that. It would
not be pleasant at all if I had to totally re-vamp the way my object
works, (eg. using private x,y values and using those in "paint" rather
than doing a zero-based paint and trusting the matrix to do the
positioning), just to extend the way I animate for example.

That is, it would be nice if a single model could be used by both
simple applications and applications with more complex needs. That way
there's a smooth way for applications to "grow up".

To me it seems like something like "set_position" would do this just
fine, (but I'm still not sure if I have a grasp of the intended model

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