Graphviz: Layout multiple clusters

Question

digraph G {
  rankdir=LR;
  subgraph cluster_one {
    one_x -> one_y -> one_z;
  }
  subgraph cluster_two {
    two_x -> two_y;
  }
  subgraph cluster_three {
    three_x -> three_y;
  }
}

1. The order of the clusters is reversed. They should be in the order they appear in the source file.
2. I want all clusters to be of the same width (determined by the largest sub-graph) and aligned.

Answer 1

The order of the clusters is reversed. They should be in the order they appear in the source file.

The following code should work:

digraph G {
  rankdir=LR;
  subgraph cluster_one {
    shape=rect;
    one_x -> one_y -> one_z;
  }
  subgraph cluster_two {
    two_x -> two_y;
  }
  subgraph cluster_three {
    three_x -> three_y;
  }
  one_x->two_y[style=invis];
  two_x->three_y[style=invis];
}

I want all clusters to be of the same width (determined by the largest sub-graph) and aligned.

I have found this answer. It is a bad solution, but I can't give a better one.