Graphviz:如何使子图节点成一直线排列？

Question

我正在尝试以下列方式使用Graphviz可视化我的源代码存储库的历史记录(从上到下或从左到右无关紧要):

m1 -> m2 ----> m3 -----> m4 -> m5
    \                    ^
     \-> b1 -> b2 -> b3 -/

给定此点文件:

digraph git {
    subgraph master {
        m1 -> m2 -> m3 -> m4 -> m5
    }
    subgraph branch {
        m2 -> b1 // branch from master
        b1 -> b2 -> b3
        b3 -> m4 // merge into master
    }
}

我应该设置什么属性以将子图的所有节点(属于同一分支)放置在一条直线上？

Answer 1

最简单的解决方案是将分支和合并边的weight设置为0:

digraph git {
    rankdir=LR
    subgraph master {
        m1 -> m2 -> m3 -> m4 -> m5
    }
    subgraph branch {
        m2 -> b1[weight=0] // branch from master
        b1 -> b2 -> b3
        b3 -> m4[weight=0] // merge into master
    }
}

rankdir=LR将布局从上到下更改为从左到右。

另请参阅我对类似问题的回答:
Forcing "main line" nodes into a straight line in Graphviz (or alternatives)