Feature Request: Is it possible to support the rank attribute in the twopi layout?

[The_book]

I have three layers of nodes arranged on three concentric rings, but some third-layer nodes are directly connected to the first layer, causing Graphviz to place them in the second layer.

Currently, I can work around this issue by adding an invisible node with zero size, but this results in polyline connections.

I hope to be able to specify the rank of nodes in the twopi layout.

[scnorth]

There is no such feature, but I’m willing to try my hand at this when I can make time.

[steveroush]

• minlen would also be a nice addition (to allow relative rank setting)
• here are two programs (pre-processors, written in gvpr) that might might help in the interm:
  • setTwopiRanks.gvpr - adds a rank attribute to twopi
  • radialLayout.gvpr - a general-purpose radial engine for Graphviz
• Here is an Issue for this request [twopi] Allow user to explicitly specify a rank / distance from the root (enhancement) (#2412) · Issues · graphviz / graphviz · GitLab

[The_book]

Interesting. I didn’t even notice that there was such a tool as gvpr
I will try to study it in depth
As I understand it, this configuration of rank actually configures invisible intermediate nodes and intermediate connections? It seems that this logic can handle it directly without this gvpr. I’ll give it a try

[scnorth]

I tried this, but not sure it’s correct.