Re: [Matplotlib-users] Transparent plot symbols

[Eric F. <ef...@ha...>]

Paul Smith wrote:
> Hi,
> I can't find a way to plot marker symbols that have a transparent face colour, 
> so I can see the contour plot that's under them. Setting alpha affects the 
> edge colour as well.
> Any suggestions?

Paul,

If you want the symbol faces to be completely transparent, set 
mfc='None' (with quotes):

plot([1,2,3], 'o', mfc='None')

If you need them to be colored but with an alpha, then you will have to 
plot twice, once for the edges as above (adding an alpha kwarg if 
desired), and the second time for the centers with markeredgewidth=0 to 
turn off the edges.  (For consistency one might expect mec='None' should 
work the same way, but it doesn't.)

The drawing model is such that alpha is attached to the whole marker, 
and can't be set separately for edge and face without making two 
separate markers, as suggested above.  Note also that postscript doesn't 
support alpha at all.

Eric




> Paul
> 
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