orderGraphviz - fixed subgraphs

Question

I like to create a 3 column graph like this:

Code:

digraph         


        

Answer 1

You may try adding the edges which are not supposed to influence the layout with constraint=false. After the last cluster, insert something like:

edge[constraint=false, style=solid];
c->f;
b->g;

If the clusters get reordered anyway, you may add invisible edges (make sure that constraint=true) to enforce the layout:

c -> e [constraint=true, style=invis];
e -> a [constraint=true, style=invis];