Graphviz — 将节点放置在水平线上

Question

我有以下 graphviz 文件。现在，边缘标签放置在水平线上，但我希望将节点放置在水平线上。我怎样才能做到这一点？

 digraph finite_state_machine {
    node [shape = doublecircle]; q_5;
    node [shape = circle];
    q_1 -> q_2 [ label = "." ];
    q_1 -> q_2 [ label = "\epsilon" ];
    q_2 -> q_1 [ label = "\epsilon" ];
    q_2 -> q_3 [ label = "a" ];
    q_3 -> q_4 [ label = "^\wedge a" ];
    q_3 -> q_4 [ label = "\epsilon" ];
    q_4 -> q_3 [ label = "\epsilon" ];
    q_4 -> q_5 [ label = "b" ];
}

这是它目前的样子：

Answer 1

您可以使用rank=same 强制所有节点的排名相同：

digraph finite_state_machine {
{
rank=same;
    node [shape = doublecircle]; q_5;
    node [shape = circle];
    q_1 -> q_2 [ label = "." ];
    q_1 -> q_2 [ label = "\epsilon" ];
    q_2 -> q_1 [ label = "\epsilon" ];
    q_2 -> q_3 [ label = "a" ];
    q_3 -> q_4 [ label = "^\wedge a" ];
    q_3 -> q_4 [ label = "\epsilon" ];
    q_4 -> q_3 [ label = "\epsilon" ];
    q_4 -> q_5 [ label = "b" ];
    }
}