I am revisiting a simple kaleidoscope program in which I would like to add opacity/transparency for the colors. Can that be done? I have rummaged around looking for info on the alpha channel, but can't find anything that isn't stuck inside the ColorSelection widget. That's not what I want; just the adjusting of the transparency.
So, I have an array of 30 triangles, in order; a GdkColor array of 30 colors. Is there a straightforward way to add varying opacity for the triangles? I would like to have the triangles grow less and less opaque going from bottom to top. This all is done through a pixmap, of course. I read the passage on the ColorSelection widget in the Gtk tutorial. It talks about the alpha channel, which goes from 0 - 65535. I added that to the little sample code in the tutorial, and a ColorSelection dialogue does show an opacity slider, but with a range from 0 - 255. But the tutorial does not show how to use the alpha channel in selecting a color. GdkColor doesn't include an alpha channel. The GIMP does have an opacity slider sometimes, and in playing with it I could change the opacity of a color. That as well has a range of 0 255, not the full alpha channel of 0 - 65535. Any help in adding varying opacity/transparency for the triangles will be much appreciated. Michael Ehrhardt _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
