[Mne_analysis] Circular layout for directed graphs

[Andrea Brovelli]

        External Email - Use Caution        

Dear all,

I would like to plot a directed graph using the circular plot, but the 
current version of mne.viz.circular_layout does not implement it (yet?).

Does anyone have any ideas and/or codes to implement directional 
circular layouts?

I see two ways that may do the job: 1) add an arrow from the source to 
the sink; 2) have a color gradient, say from blue to red, from the 
source to the sink.

Thanks a lot.

Cheers,

Andrea