When I switch to the GTKCairo backend, the alpha value no longer seems
to get passed when I use fill(). I looked at backend_cairo.py and I
believe this is because _fill_and_stroke always uses
ctx.set_source_rgb, instead of ctx.set_source_rgba.
I hacked backend_cairo.py to look at gc._alpha (I had to add gc as an
argument) and fill() with alpha works properly now.
def _fill_and_stroke (self, gc, ctx, fill_c):
#assert fill_c or stroke_c
#_.ctx.save()
if fill_c:
ctx.save()
if gc._alpha is not None:
ctx.set_source_rgba (fill_c[0], fill_c[1], fill_c[2], gc._alpha)
else:
ctx.set_source_rgb (*fill_c)
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