如何在（简单的）有向图中强制直边？

Question

我有以下简单的有向图：

digraph clientproxyserver {
  "Client" -> "Proxy" [ label="Request from Client" ];
  "Proxy" -> "Server" [ label="Forwarded Request" ];
  "Server" -> "Proxy" [ label="Response from Server" ];
  "Proxy" -> "Client" [ label="Forwarded Response" ];
}

运行这个槽dot:

dot -Grankdir=LR -Nshape=box -Nheight=1 -Tpng -ocps.png cps.gv

我得到以下结果：

怎样才能使底部的两条边成直线？

Answer 1

这就是选项 splines=ortho 通常用于：

digraph clientproxyserver {
    rankdir=LR;
    node[shape=box, height=1];
    splines=ortho
  "Client" -> "Proxy" [ label="Request from Client" ];
  "Proxy" -> "Server" [ label="Forwarded Request" ];
  "Server" -> "Proxy" [ label="Response from Server" ];
  "Proxy" -> "Client" [ label="Forwarded Response" ];
}

不幸的是，edges/labels 的位置非常混乱：

根据我的经验，ortho 样条曲线很少能产生令人满意的结果。

另一种选择是使用 splines=polyline:

如何在（简单的）有向图中强制直边？

How do I force straight edges in a (simple) Digraph?

graphviz