Thanks for the response Max. I'm already quite invested in the Cairo path - this is an existing project that I'm enhancing. I'm getting close to another release of it. Preview: http://tesla.duckdns.org/images/powercom.jpg
It's a visualisation app for energy stats that lets you plug in data sets to add new graph series. In my case ( ie screenshot ), I'm graphing energy production ( solar panels ) in blue, energy sold to the grid in green, general energy use in red, and controlled load ( hot water circuit ) in black. I'll check out GooCanvas for future projects, but now I'm just trying to hack in some crosshairs that follow the mouse and give an exact display of the co-ordinates ... preferably without a major rewrite. On Thu, Aug 17, 2017 at 2:36 AM, <max.augsb...@gmx.de> wrote: > Dear Dan, > > I think the simplest solution would be to use my GooCanvas2 module (see > https://metacpan.org/pod/GooCanvas2 ). The module works exactly as the C Api > (it's a pure Glib::IO binding). Therefore > https://developer.gnome.org/goocanvas/unstable/ is a good starting point... > Especially the GooCanvas2::CanvasItem has an item press event and such > things: > https://developer.gnome.org/goocanvas2/stable/GooCanvasItem.html#GooCanvasItem-button-press-event > > Perhaps this is helpful... > > The Gtk3 canvas element (from which I think DrawingArea inherits its > painting capabilities) is hard to handle for event purposes... > > Best wishes, > Max > > > Gesendet: Mittwoch, 16. August 2017 um 14:12 Uhr > Von: "Daniel Kasak" <d.j.kasak...@gmail.com> > An: "gtk-perl mailing list" <gtk-perl-list@gnome.org> > Betreff: Motion events in a DrawingArea > Hi all. > > I'm trying to capture mouse events in a DrawingArea ( in Gtk3 ). I'm > adapting code at http://www.perlmonks.org/?node_id=583578 ... but when > I go: > > $self->{drawing_area}->set_events( > [ qw/ exposure-mask > leave-notify-mask > button-press-mask > pointer-motion-mask > pointer-motion-hint-mask > / > ] > ); > > ... I get a warning: > > Gtk-CRITICAL **: gtk_widget_set_events: assertion > '!_gtk_widget_get_realized (widget)' failed > > I've tried putting this later on in the code when I guess the widget > *should* be realized, eg at the end of the render_graph() method which > I hook up thus: > > $self->{drawing_area}->signal_connect( draw => sub { > $self->render_graph( @_ ) } ); > > ... but it still gives the same error. > > Next I try to connect to a signal handler anyway: > > $self->{drawing_area}->signal_connect( > 'motion_notify_event' > , sub { $self->handle_graph_mouse_move( @_ ) } > ); > > ... but this handler never gets called. > > I guess things have changed in Gtk3? I haven't been able to find an > updated demo, even in C. Any hints as to what I'm missing? > > Dan > _______________________________________________ > 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
