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How can you draw semi-transparent primitives such as filled polygons to a Drawable in GTK?
Its 2010, and I google isn’t finding how to put an alpha value into a colour for me. What am I missing?
Use
gtk.gdk.Drawable.cairo_create()and operate on the returnedgtk.gdk.CairoContext. See documentation. Cairo is a generic vector 2D library that is used in GTK+ since many versions ago; GDK drawing primitives are deprecated in its favor (though not the whole GDK).