Graphviz - 将节点放置在水平线上

Question

我有以下graphviz文件。现在，边缘标签放置在一条水平线上，但我希望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强制同一级别的所有节点：

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" ]; 
    } 
}