Connected clusters

[gf-charles]

digraph G {
  subgraph cluster_something {
    label = "something";

    thing1;
    thing2;
  }

  subgraph cluster_other {
    label = "other";

    thing3;
    thing4;
  }
  cluster_something -> cluster_other;
}

How can i get it to connect the two clusters instead of creating new nodes?

Thank you!

[steveroush]

Unfortunately, there is no “works all the time” answer. The closest easy solution is using compound=true (compound | Graphviz) plus ltail and lhead.
If this works for you, great. If not, maybe we can find a better solution.

digraph G {
  // edges have to be node-to-node
  // compound allows pseudo cluster-to-cluster
  // minlen to keep on same rank
  // nodesep to spread things out

  compound=true
  nodesep=.55

  subgraph cluster_something {
    label = "something";

    thing1;
    thing2;
  }

  subgraph cluster_other {
    label = "other";

    thing3;
    thing4;
  }
  thing2 -> thing3 [minlen=0 ltail="cluster_something" lhead="cluster_other"]   
}

Giving:

[jjlong]

There is a thread of how to do it on StackOverflow.