But the edges are crossing a lot... Is there a kind of
algorithm to sort the nodes to remove the crossing or I ask to much ?
What you are asking for is not trivial actually :-)
There is the sugiyama layout which is exactly about that: minimizing edge crossing.
I do not know how does it fit in your situation.
Have you tried to order the elements of each layers, according to what there is in the
above layer? I would guess this result in something reasonable.
Alexandre
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Alexandre Bergel
http://www.bergel.eu
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