[matplotlib-devel] Artist default alpha value

All,

 

I have a question regarding the default alpha value for an Artist.  Why is it 1.0 instead of None?  The color conversion code takes
into account if alpha is None and having it default to something other than None makes it impossible for any Patch to have a
fill_color specified as an RGBA value (and possibly other Artist sub-classes).  Should this be something else, or should the
Patch.set_facecolor method pre-process the incoming color value and set any specified alpha as appropriate (I hope not since this
would cause the color value to be processed several times)?

 

Thanks,

--James Evans