How to combine graphs of different layouts into one output graph with gvpack?

Help
1

Hi,

let’s say we have 2 digraphs D and N as follow

digraph D {
layout="dot"
n0 -> {n1  n2  n3} ;
}

digraph N {
layout="neato"
n0 [ pos = "0,0!" ];
n1 [ pos = "2,0" ];
n2 [ pos = "2,1!" ];
n0 -> {n1  n2  n3} ;
}

I’m trying to pack them with gvpack and have :
on the left-hand side the D graph
on the right-hand side the N graph.

What I’ve tried so far is :

dot D.dot > D-o.dot
dot N.dot > N-o.dot
gvpack  -array_i2 D-o.dot N-o.dot > pack.dot
Warning: node n1 in graph[1] N already defined
Some nodes will be renamed.

The warning is of course normal… and then

neato -s -n2  pack.dot -Tsvg > pack.svg 
Warning: layout attribute is invalid except on the root graph
Error: Layout type: "" not recognized. Use one of: circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi
Error: Layout was not done.  Missing layout plugins?

cp pack.dot pack2.dot

I edited the pack2.dot file by just adding layout=“neato” to the top graph

neato -s -n2 pack2.dot -Tsvg > pack.svg

And I have as a result :
pack

  • How could I have a better workflow and avoid editing the pack.dot file?
  • And How could I have better edges?

Thanks.
pack.dot (1.6 KB)
pack2.dot (1.6 KB)

2

the problem with edges is linked to the fact that the label is longer due to the duplicate names…
If we handle the duplicates then everything is OK :
no-duplicate-names

And I also forgot an exclamation mark for n1 : n1 [ pos = “2,0” ]; should be n1 [ pos = “2,0!” ];

Anyway, I don’t know how to resolve my main problem: a direct workflow without editing the pack.dot file.

3

I’m not clear on the problem. What would “a better workflow” and “better edges” be? It’s unclear what “better” means. What aspect are you looking to improve?

4
  • if possible, remove the layout attribute from the source file. use the command line to choose an engine (dot or neato)
  • to have duplicate labels, set the label explicitly: abc [label="n0"]
  • I think the -s command line option is unnecessary when using neato -n2

Easy to automate, no hand editing.

5

Perfect !
The solution is to remove the layout attribute from the source file and use the right command as you suggested :

$ dot D.dot   > D-o.dot
$ neato N.dot > N-o.dot
$ gvpack  -array_i2 D-o.dot N-o.dot > pack.dot
$ neato -n2  pack.dot -Tsvg > pack.svg
$ chrome $(pwd)/pack.svg

ok

no hand editing.

Thanks!