graphviz中的重叠边缘

Question

我有两个重叠边缘，不知道原因：

digraph G {
    graph [rankdir=LR, overlap=false];
    subgraph cluster1 {
       d1;
       n1;
    }
    subgraph cluster2 {
       n2;
       d2;
    }
    n1 -> n2;
    n2 -> n1;
    d0 -> d1;
    d0 -> d2;
}

有没有办法分别显示边n1 -> n2和n2 -> n1？删除群集不是一种选择，但会有所帮助......

Answer 1

使用portPos修饰符的解决方案：

digraph G {
    graph [rankdir=LR, overlap=false];
    subgraph cluster1 {
       d1;
       n1;
    }
    subgraph cluster2 {
       n2;
       d2;
    }
    n1:sw -> n2:nw;
    n2:ne -> n1:se;
    d0 -> d1;
    d0 -> d2;
}

另一种解决方案是使用dir和color修饰符：

digraph G {
    graph [rankdir=LR, overlap=false];
    subgraph cluster1 {
       d1;
       n1;
    }
    subgraph cluster2 {
       n2;
       d2;
    }
    n2 -> n1[dir=both color="red:blue"];
    d0 -> d1;
    d0 -> d2;
}

如果您想要保持黑白着色方案，甚至可以使用color="black:black"。

Answer 2

试错法解决方案（不要问我为什么这样做......）：

digraph G {
    graph [rankdir=LR, overlap=false];
    subgraph cluster1 {
       d1;
       n1;
    }
    subgraph cluster2 {
       n2;
       d2;
    }
    n1 -> n2;
    n1 -> n2[constraint=false, dir=back];
    n2 -> n1[style=invis];
    d0 -> d1;
    d0 -> d2;
}