Graphviz Dot将节点放在子图中，即使它已在其他地方定义

Question

我正在尝试为家庭作业问题制作一个点脚本生成器，它很顺利，除了我有这个问题，其中一些未在子图中定义的节点被放置在它们中。例如，以下点脚本：

digraph dg {
    compound=true;
    labelloc="t";
    label="test.cpp";
    Vehicle;
    Make;
    subgraph clusterFord {
        label="Ford"
        Ford[shape="none"][style="invis"][label=""];
        Mustang -> Vehicle [label="private"];
        Thunderbird -> Vehicle [label="private"];
    }
    Ford -> Make [label="public"][ltail ="clusterFord"];
    subgraph clusterChevrolet {
        label="Chevrolet"
        Chevrolet[shape="none"][style="invis"][label=""];
        Camero -> Vehicle [label="private"];
    }
    Chevrolet -> Make [label="public"][ltail ="clusterChevrolet"];
}

生成此image：

＆＃34;车辆＆＃34;节点应该在＆＃34;福特＆＃34;之外。 subrgraph。我在这里缺少什么？

Answer 1

这将给你想要的东西：

digraph dg {
    compound=true;
    labelloc="t";
    label="test.cpp";
    subgraph clusterFord {
        label="Ford"
        Ford[shape="none"][style="invis"][label=""];
        Mustang
        Thunderbird
    }
    subgraph clusterChevrolet {
        label="Chevrolet"
        Chevrolet[shape="none"][style="invis"][label=""];
        Camero
    }
    Ford -> Make [label="public"][ltail ="clusterFord"];
    Chevrolet -> Make [label="public"][ltail ="clusterChevrolet"];
    Mustang -> Vehicle [label="private"];
    Thunderbird -> Vehicle [label="private"];
    Camero -> Vehicle [label="private"];
}