Sankey Plugin, complex path to draw links

[ghedamat]

As seen in
http://bl.ocks.org/d/4599519/

using a thick line to draw links between blocks can lead to artifacts ( just drag the blocks around)

this patch uses a set of 4 lines to draw the connection between blocks, see
http://bl.ocks.org/d/4599792/

see also
http://bl.ocks.org/d/4590576/
for the usual example after this patch

[mbostock]

Unfortunately, the problem with this fix is that the links are no longer of constant width—which is generally a requirement with Sankey diagrams, as the width of the link is the primary visual encoding.

[mbostock]

Also. Thank you for the suggestion and the helpful demonstrative examples!

[ghedamat]

I understand, my knowledge of the sankey diagrams is not deep unfortunately :(

This fix suits my actual needs but I guess we should probably look for another solution for those graphical quirks,
if you have any better solution/idea let me know, I'll be happy to give it a try!