[pygtk] gnome canvas get_bounds() broken?

[Rob Brown-Bayliss]

It seems that only CanvsRichtext wont return anything useful form get_bounds()


On 1/21/06, Andrew Reid <Andrew.Reid at nist.gov> wrote:
> On Fri, Jan 20, 2006 at 12:13:30PM +1300, Rob Brown-Bayliss wrote:
> > HI,
> >
> > Does any one know ifthe gnome canvs items get_bounds() function is working?
> >
> > When I call it from any object on my canvas I get: (0.0, 0.0, 0.0,
> > 0.0) which suggests that it is broken.
>
>   We have a project that makes extensive use of the canvas, and
> have had some difficulties with the get_bounds function.  It seems
> to compute the bounds incorrectly for outline polygons, or possibly
> only for the first outline polygon drawn to it.
>
>   It may be related to the fact that, in our case, the relation
> between canvas space and "user space" includes an inversion operation,
> so that polygons which are right-handed in user space are left-handed
> in canvas space, and vice versa.  The only reason we think this is
> because it's the only thing we can think of that makes polygons
> different from other sorts of primitives.
>
>   We haven't investigated this in detail, since the bounds seem
> to start working after a while.
>
>                                 -- A.
> --
> Dr. Andrew C. E. Reid, Guest Researcher
> Center for Theoretical and Computational Materials Science
> National Institute of Standards and Technology, Mail Stop 8500
> Gaithersburg MD 20899 USA
> andrew.reid at nist.gov
>