如何在 Graphviz Dot 中创建从节点到子图的边？

Question

我想创建一个看起来像这样的图表，我。 e.其中一条边从节点Manufacturer of means of production 到具有相同名称的子图。

我为此编写了以下代码：

digraph G {
    rankdir=LR;
    compound=true;

    graph [fontname="Liberation Mono"];
    node [fontname="Liberation Mono"];
    edge [fontname="Liberation Mono"];

    subgraph cluster0 {
        label="System components";
        mmp [label="Manufacturer of means of production", shape=box];
    }

    subgraph cluster1 {
        t1start [label="Start of tact 1", shape=point]
        t1end [label="End of tact 1", shape=point ]
        subgraph cluster1_mmp {
            label="Manufacturer of means of production"

            cluster1_1 [label="Node 1", color=white]


            subgraph cluster1_1_1 {
                label="Technological cycle 1"

                cluster1_1_1 [label="Node 2", color=white]
            }
            subgraph cluster1_1_2 {
                label="Technological cycle 2"

                cluster1_1_2 [label="Node 2", color=white]
            }
        }
    }

    subgraph cluster2 {
        label="Такт 2"
        t2start [label="Start of tact 2", shape=point]
        t2end [label="End of tact 2", shape=point]

    }
    t1end -> t2start
    mmp -> cluster1_1 [ltail=cluster1_mmp]; 
}

如果我尝试编译此代码 ("C:\Program Files (x86)\Graphviz2.38\bin\"dot.exe -Tpng -ograph.png graph.dot)，我会收到警告 Warning: mmp -> cluster1_1: tail not inside tail cluster cluster1_mmp。

我怎样才能修复它并使边缘进入子图？

更新 1：

您可以在下面找到预期结果的图像——从节点到子图（子图，而不是子图中的节点）的边。下图中这条边是红色的。

更新 2：更改代码如下所示。

digraph G {
    rankdir=LR;
    compound=true;

    graph [fontname="Liberation Mono"];
    node [fontname="Liberation Mono"];
    edge [fontname="Liberation Mono"];

    subgraph cluster0 {
        label="System components";
        mmp [label="Manufacturer of means of production", shape=box];
    }

    subgraph cluster1 {
        t1start [label="Start of tact 1", shape=point]
        t1end [label="End of tact 1", shape=point ]
        subgraph cluster1_mmp {
            label="Manufacturer of means of production"

            testNode [label="Node 1", color=white]

            subgraph cluster1_1_1 {
                label="Technological cycle 1"

                cluster1_1_1 [label="Node 2", color=white]
            }
            subgraph cluster1_1_2 {
                label="Technological cycle 2"

                cluster1_1_2 [label="Node 2", color=white]
            }
        }
    }

    subgraph cluster2 {
        label="Такт 2"
        t2start [label="Start of tact 2", shape=point]
        t2end [label="End of tact 2", shape=point]

    }
    t1end -> t2start
    mmp -> cluster1 [ltail=cluster0, lhead=cluster1, label="           "];

}

Answer 1

你需要改变你的最后一行

mmp -> cluster1_1 [ltail=cluster1_mmp];

到

mmp -> cluster1_1 [lhead=cluster1 label="           "]

然后图形如预期的那样出现

此外，如果您希望边缘从框外开始，那么您会这样做

mmp -> cluster1_1 [ltail=cluster0 lhead=cluster1 label="           "];

编辑

最终使用的代码

digraph G {
    rankdir=LR;
    compound=true;

    graph [fontname="Liberation Mono"];
    node [fontname="Liberation Mono"];
    edge [fontname="Liberation Mono"];

    subgraph cluster0 {
        label="System components";
        mmp [label="Manufacturer of means of production", shape=box];
    }

    subgraph cluster1 {
        t1start [label="Start of tact 1", shape=point]
        t1end [label="End of tact 1", shape=point ]
        subgraph cluster1_mmp {
            label="Manufacturer of means of production"

            cluster1_1 [label="Node 1", color=white]


            subgraph cluster1_1_1 {
                label="Technological cycle 1"

                cluster1_1_1 [label="Node 2", color=white]
            }
            subgraph cluster1_1_2 {
                label="Technological cycle 2"

                cluster1_1_2 [label="Node 2", color=white]
            }
        }
    }

    subgraph cluster2 {
        label="Такт 2"
        t2start [label="Start of tact 2", shape=point]
        t2end [label="End of tact 2", shape=point]

    }
    t1end -> t2start
    mmp -> cluster1_1 [lhead=cluster1 label="           "]
}

同样的小提琴link

Answer 2

呃，你的意思是“lhead=cluster1_mmp”而不是 ltail？

你的边缘被指定为：

mmp -> cluster1_1 [ltail=cluster1_mmp]; 

您收到的错误消息是“警告：mmp -> cluster1_1：tail not inside tail cluster cluster1_mmp”

这表示您的尾巴不在尾簇内。尾簇是 cluster1_mmp。 cluster1_1，这就是您要连接的，肯定在 cluster1_mmp 中。这解释了你的困惑。

只有在使用 GraphvizFiddle 进行大量调查后，我才最终记得箭头的尖端是 head（也就是说，语法是 tail -> head）。

所以，cluster1_1，您要说的节点在 cluster1_mmp 中是箭头的头部。这就是为什么您的 ltail 规范不起作用的原因。将其更改为 lhead 可以消除错误消息并生成一个看起来像您的图片的图形。箭头指向子图，正是您在问题中所要求的。

这是两个 GraphvizFiddles，一个 of the original code generating the original error 和一个 with ltail changed to lhead，与您的图片相匹配。

（我确信我已经花了很长时间在自己的图表中调试相同的问题。也许 Graphviz 可以更新以检查 ltail 参数是否对箭头有意义，反之亦然，并吐出更多信息有用的错误信息。）