与其他节点具有相同等级的 graphviz 集群

Question

我正在尝试创建一个图表，我明确指定了许多节点的等级并指定了集群。以下代码生成我想要的图形类型:

digraph {
    rankdir=LR
    subgraph cluster0 {
        "MATH 208"
        "MATH 211"
        graph [rankdir=LR, style="rounded,filled", color=gray]
    }
    subgraph year1 {
        subgraph {
            "MATH 100"
            "MATH 110"
            graph [rankdir=LR, rank=same]
        }
        subgraph {
            "MATH 101"
            "MATH 211"
            "MATH 208"
            graph [rankdir=LR, rank=same]
        }
        graph [rankdir=LR]
    }
    subgraph year2 {
        subgraph {
            "MATH 205"
            "PHIL 203"
            graph [rankdir=LR, rank=same]
        }
        graph [rankdir=LR]
    }
    subgraph year3 {
        subgraph {
            "MATH 311"
            "MATH 312"
            "MATH 375"
            graph [rankdir=LR, rank=same]
        }
        graph [rankdir=LR]
    }
    subgraph year4 {
        subgraph {
            "MATH 447"
            "MATH 412"
            graph [rankdir=LR, rank=same]
        }
        graph [rankdir=LR]
    }
    "MATH 100" -> "MATH 101"
    "MATH 100" -> "MATH 208"
    "MATH 101" -> "MATH 205"
    "MATH 110" -> "MATH 311"
    "MATH 211" -> "MATH 311"
    "MATH 110" -> "MATH 312"
    "MATH 211" -> "MATH 312"
    "PHIL 203" -> "MATH 375"
    "MATH 110" -> "MATH 447"
    "MATH 211" -> "MATH 447"
    "MATH 311" -> "MATH 412"
    "MATH 312" -> "MATH 412"
}

这会生成一个正确的图形，其中“MATH 211”与“MATH 101”处于同一等级，但是 graphviz 会发出警告

Warning: MATH 208 was already in a rankset, ignored in cluster pruned
Warning: MATH 211 was already in a rankset, ignored in cluster pruned

如果我从 year1 子图中删除“MATH 211”和“MATH 208”，graphviz 不再提示，但生成的图不再具有与“MATH 101”相同级别的集群(为什么会...) :

有什么方法可以重新排列/重新排序我的点文件以生成第一个图形但没有任何警告？或者指定某个集群应该与另一个节点位于同一级别？

我应该注意到这个图在 graphviz 2.26 上成功编译，但在 graphviz 2.28 上失败...

Answer 1

几个想法

• 我认为子图需要有一个以“cluster”开头的名称为了获得任何造型。实际上，如果没有集群前缀，他们可能根本不会做任何事情这可能是您许多问题的根源。
• 您不需要重复 rankdir=LR。在顶部指定一次就足够了。
• 如果子图中没有节点相互依赖，则他们很有可能已经处于同一等级，而 rank=same 不应该需要。

这是一个适合我的版本:

    digraph {
    rankdir=LR
    subgraph cluster0 {
        "MATH 208"
        "MATH 211"
        graph [style="rounded,filled", color=gray]
    }
    subgraph clusteryear1 {
        subgraph cluster100{
            "MATH 100"
            "MATH 110"
            graph [rank=same]
        }
        subgraph cluster101{
            "MATH 101"
            "MATH 211"
            "MATH 208"
            graph [rank=same]
        }
    }
    subgraph clusteryear2 {
        subgraph cluster205{
            "MATH 205"
            "PHIL 203"
            graph [rank=same]
        }
    }
    subgraph clusteryear3 {
        subgraph cluster311{
            "MATH 311"
            "MATH 312"
            "MATH 375"
            graph [rank=same]
        }
    }
    subgraph clusteryear4 {
        subgraph cluster447 {
            "MATH 447"
            "MATH 412"
            graph [rank=same]
        }
    }
    "MATH 100" -> "MATH 101"
    "MATH 100" -> "MATH 208"
    "MATH 101" -> "MATH 205"
    "MATH 110" -> "MATH 311"
    "MATH 211" -> "MATH 311"
    "MATH 110" -> "MATH 312"
    "MATH 211" -> "MATH 312"
    "PHIL 203" -> "MATH 375"
    "MATH 110" -> "MATH 447"
    "MATH 211" -> "MATH 447"
    "MATH 311" -> "MATH 412"
    "MATH 312" -> "MATH 412"
}