Re: Event woes for items with irregular shapes

[Damon Chaplin <damonachaplin gmail com>]

On Mon, 2018-08-27 at 12:26 +0300, Yavor Doganov wrote:
> Damon Chaplin wrote:
> > On Mon, 2018-08-27 at 08:20 +0300, Yavor Doganov wrote:
> > > (Country images are rects with opaque territory and translucent
> > > area
> > > beyond their borders.)
> > One solution may be to create your own custom canvas item, similar
> > to
> > GooCanvasImage, but keep the pixbuf around and use that to check
> > the
> > pixel, using code similar to GnomeCanvas.
>
> Thank you very much, this works perfectly.  I just changed a bit
> goo_canvas_image_is_item_at and added the pixbuf as member of the
> image data struct so that I have easy access to it.
>
> The only problem is that I had to duplicate all of goocanvasimage.c
> and incorporate that into the program's code, but that's merely
> inconvenience.  (I also had to declare
> goo_canvas_cairo_pattern_from_pixbuf as it's a private function.)
>
> > (I probably should have done that with GooCanvasImage.)
>
> Perhaps it is not too late, in a future release?  The change is
> minimal and I think it's worth it, even if it ends up being
> ABI-incompatible.  Your call in any case, I just want to thank you
> once again for the quick and accurate advice.

Wow. You did that quick! I think you're a better coder than me!

Unfortunately I don't really spend much time on GooCanvas any more, so
the chances of a fix are quite low.

I think the new GTK has broken GooCanvas quite a bit too, so it may not
have too much of a future.

Damon