Ah, thankyou :) Yes, indeed, if I avoid constructing further contexts, it works. I can replace this with just calling set_source_rgba() on the 1 context in *most* cases, though I'd have to have *two* passes for the graphs, as I draw a 'highlight' line ( lighter colour ) as well as the 'regular' line that encloses the bars ( and which I call ->fill inside of later ). Still, that's not much more work.
Does anyone know ... would this bug be in the bindings, or in gtk+ or cairo? Dan On Wed, Oct 11, 2017 at 1:43 PM, Jeremy Volkening <j...@base2bio.com> wrote: > On Tue, Oct 10, 2017 at 09:38:03PM +1100, Daniel Kasak wrote: >> >> I've cut down my app to a "relatively small" example which doesn't >> need a database connection or loads of other stuff. It's still 400+ >> lines ( with lots of whitespace ). I know it's asking a lot, but if >> someone can figure out what I'm doing wrong, I'd be very grateful ... > > > Your issues stem from the creation of multiple contexts referencing the > DrawingArea surface within the 'draw' callback, i.e. > > my $surface = $cairo_context->get_target; > # and later.. > my $this_stat_context = Cairo::Context->create( $surface ); > > If you re-write your code without doing this -- just use the context passed > into the 'draw' signal callback along with save() and restore() -- I think > you will find your issues disappear. I haven't completely re-written your > code, but I tested on one small bit and it had the desired effect. > > Why this happens is a little bit hazy to me. If you print the values > passed into the 'draw' callback, you can see that all of the pointers to the > cairo context are the same for the different DAs. Somehow this gets sorted > out if you just use the context as given, but my guess is that when you are > calling get_target() it returns the surface for the first DrawingArea only, > and then your issues arise. > > Regards, > Jeremy > > -- > Civilization is the limitless multiplication of unnecessary necessities. > -- Mark Twain > _______________________________________________ > gtk-perl-list mailing list > gtk-perl-list@gnome.org > https://mail.gnome.org/mailman/listinfo/gtk-perl-list _______________________________________________ gtk-perl-list mailing list gtk-perl-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-perl-list
