If the color of a polygon is set to 'none' (meaning no fill), the alpha set
for that polygon doesn't seem to apply to the boundary of that polygon. To
see this, change the following line in integral_demo.py (in the matplotlib
gallery):
poly = Polygon(verts, facecolor='0.8', edgecolor='k')
to
poly = Polygon(verts, facecolor='k', edgecolor='k',alpha=0.1)
in this case, the alpha is applied to both the fill and the edge. Now
change that same line to
poly = Polygon(verts, facecolor='none', edgecolor='k',alpha=0.1)
And then there is no fill as expected, but the edge is now dark black again
instead of being light due to the alpha of 0.1.
--
Daniel Hyams
dhy...@gmail.com
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