On 06/04/2010 07:46 AM, Bob wrote:
> I'm using matplotlib v0.99.1.1 pyplot savefig() to generate svg files
> using the matplotlib.use('SVG') backend. My networkx plot contains
> semi-transparent edges which were not carrying over to the svg xml
> correctly. The node transparencies were correct.
> I was able to fix this problem by modifying
> /matplotlib/backends/backend_svg.py ...
>
>
> @@ -150 +149 @@
> - gc.get_alpha(),
> + gc.get_rgb()[3],
I don't think this is the right thing to do in general--as far as I can
see, gc.get_rgb() can return an rgb triplet instead of an rgba quad.
>
>
> While gc.get_rgb()[3] was able to return the correct alpha float
> value, gc.get_alpha() was always returning 1.0.
> Has anyone else seen this problem? Perhaps it's my use of
> draw_networkx_edges() to style the edges.
No, I think it is part of some difficulties in alpha-handling that have
been around for a long time, and that I hope I have solved--although
most likely there are still glitches to be smoothed out.
Can you build from svn and see whether that solves the problem? If not,
please provide a simplest-possible standalone script that illustrates
the problem, so I can try running it from current mpl.
Eric
>
> Hope this helps,
> Bob
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