Graphviz：如何使用circo布局排列节点

Question

I'm trying to draw a graph with circle topology.

Here is what I'm expecting to see:

Here is my gv file:

digraph g1 {
    layout="circo";
    node [shape = doublecircle]; N4 N6;
    node [shape = circle];
    N0 -> N1 [ label = "{1,0}"];
    N1 -> N2 [ label = "{1,0}"];
    N2 -> N3 [ label = "{1,0}"];
    N3 -> N4 [ label = "{1,0}"];
    N4 -> N5 [ label = "{1,0}"];
    N5 -> N6 [ label = "{1,0}"];
    N6 -> N0 [ label = "{1,0}"];

    N0 -> N4 [ label = "{1,0}"];
    N1 -> N5 [ label = "{1,0}"];
    N2 -> N6 [ label = "{1,0}"];
    N3 -> N0 [ label = "{1,0}"];
    N4 -> N1 [ label = "{1,0}"];
    N5 -> N2 [ label = "{1,0}"];
    N6 -> N3 [ label = "{1,0}"];    
}

And here is an output image for graph above:

How can I arrange nodes in graphviz to make it look like 1 ?

Answer 1

If the goal is to have a graph which respects the order of the nodes, it's not that simple. You could calculate the position of the nodes with an external script and render it with neato .

Or you could first layout the nodes with the edges which determine the correct order of the nodes only:

digraph g1 {
    node [shape = doublecircle]; N4 N6;
    node [shape = circle];
    edge[label="{1,0}"];
    N0 -> N1 -> N2 -> N3 -> N4 -> N5 -> N6 -> N0;
}

with:

circo graph.gv > tempgraph.gv

Then add the remaining edges to tempgraph.gv - just copy-paste the following before the closing } :

N0 -> N4 [ label = "{1,0}"];
N1 -> N5 [ label = "{1,0}"];
N2 -> N6 [ label = "{1,0}"];
N3 -> N0 [ label = "{1,0}"];
N4 -> N1 [ label = "{1,0}"];
N5 -> N2 [ label = "{1,0}"];
N6 -> N3 [ label = "{1,0}"];

And render it with neato and the -n option:

neato -n tempgraph.gv -Tpng -O

You may want to fine-tune the position of the labels: