On Mon, 2006-05-08 at 22:27 +0300, Juhana Sadeharju wrote: > >I think you may need to use a canvas. For example: > >http://developer.gnome.org/doc/API/2.0/libgnomecanvas/index.html > >http://www.dachaplin.dsl.pipex.com/goocanvas/ > > Do they have a graph widget? Or are they more primitive?
No. GTK only provides primitives. There have been several graph widgets implemented using GTK. > > I need such a widget in audio apps: > (1) Envelopes drawn over the audio waveform widget. > (2) Frequency response curves of multiple parametric filters > drawn in one canvas. > (3) Control envelopes. All of these things would need to be implemented using primitives. GTK is just a GUI toolkit, not a domain-specific toolbox. Audacity (which uses wxWidgets not GTK) implemented their own widgets for dealing with waveform graphs and selections and things. > > Much of the stuff what can be seen in VST plugins, in Absynth > (specially envelopes), Waves' plugins, etc. They look nice too > unlike what I most see here. > > Does GTK canvases provide transparency? What programs uses the > canvases? I might want see how they look like. There is no GTK canvas officially yet. There are several implementations of canvases for GTK including gnome-canvas, foo-canvas, etc. They vary in purpose and function. > > With gtkglext/opengl all seems to be eventually simpler. > Multiple "widgets" can be combined by using suitable transparency > and depth coordinates. Decorations are done easily, e.g., by > modeling objects in 3D. But then I cannot use the GTK widgets > indistinctly. Interaction with the opengl objects comes a problem > as well, making it tempting to use, e.g., OSG (openscenegraph.org). > But that is a large software and written with C++, which could be > a problem if I want code in C. > > How would GTK's Cairo integration help? If at all. Using Cairo do do you drawing of wave forms, envelopes, etc is a good idea if Cairo is fast enough to do what you need to. Certainly it seems to me that a waveform graph, envelopes, etc would be well-suited to a vector-drawing API. > > Juhana _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
