How to increase space between edges (splines) and nodes in graphviz?

Question

I manually specified the starting position of every node and set splines=true.

The resulting image appears as follows:

The spline between 1031 and 1028 appears to touch nodes 1030 and 1029. I am just wondering if there's a way to increase the margin here. I have tried specifying esep="+3,3" to give a very high margin around nodes but the same graph is still output.

Eichler

Hm, that's very strange. Can you provide the sample file for the graph you've provided here, so we can poke around with it? – Inge

Answer 1

As you're laying out the nodes by hand, why not lay out the spline by hand as well with:

pos splineType

Splines are somewhat more complex to position than nodes, but not terribly so.

To get started, run your graph through neato with the output format set to 'dot' (-Tdot) and it will generate the lower-level layout. Then you can adjust the coordinates for the problem spline.

Hyaluronidase

Answer 2

There are also esep and sep graph attributes.

From what I have observed, these attributes work very well when using neato to generate spline edges when positions are known. But, if set to a value that is too high, the output positions do not match the input positions, at all.

Mayenne

Answer 3

sep & esep are graph-level, used to position all the nodes, but you are explicitly doing the positioning, so *sep & *esep will probably be ignored.
Instead, try adding one or more "duplicate" edges from 1031 to 1028, each in a different color, then make all the inner (too close) edges invisible.

Intrigant