I am making a graph using dot that splits into 4 parallel rows with links between them (see code below). I have organised the starting nodes into a subgraph using rank=same to ensure they start in line vertically, and then used edge[weight] to ensure each row is a straight horizontal line.
Due to the links between the rows, the initial nodes are unequally spaced vertically. Is there a way of setting them to be equal distance (i.e. increasing the distance between rows C,D,E to match the distance between B,C)? I have tried using nodesep in the subgraph but there is no effect. Any ideas? Thanks
graph Example {
rankdir=LR
ordering=out
{ rank=same
b1
c1
d1
e1
}
a1--b1
a1--c1
a1--a2--d1
a2--e1
edge[weight=100]
b1--b2--b3--b4
c1--c2--c3--c4
d1--d2--d3--d4
e1--e2--e3--e4
edge[weight=1]
b1--bc--c3
}
This may be a case for invisible nodes (and edges...).
Just add some invisible nodes between the rank=same subgraph to force exactly one node between the lines:
graph Example {
rankdir=LR
ordering=out
{ rank=same
b1 [group=b]
c1 [group=c]
d1 [group=d]
e1 [group=e]
// invisible nodes
node[style=invis]
edge[style=invis]
b1--i1--c1--i2--d1--i3--e1
}
node [group=b]
b1--b2--b3--b4
node [group=c]
c1--c2--c3--c4
node [group=d]
d1--d2--d3--d4
node [group=e]
e1--e2--e3--e4
node[group=""]
a1--b1
a1--c1
a1--a2--d1
a2--e1
b1--bc--c3
}
I also used groups to suggest straight lines instead of weight.