家谱的 Graphviz 点边缘端口

I am very接近能够生成一个看起来并不糟糕的家谱，但我遇到了以下问题。

//file: tree.dot
digraph {
    edge [dir=none];
    node [
        fillcolor="black",fixedsize=true,shape=box,
        style="rounded,filled",width=2.0
    ];
    splines=ortho;
    // GEN -01
    {
        rank=same; rankdir=LR;
        "Grandfather" [regular=0];
        m0002 [
            label="",shape=diamond,regular=0,height=0.25,
            width=0.25,style="filled",
        ];
        "Grandmother" [regular=0];
        {
            rank=same; rankdir=LR;
            "Grandfather" -> m0002 -> "Grandmother";
        }
    }
    m0002 -> c0001;
    // GEN  00
    {
        rank=same; rankdir=LR;
        c0000 [
            label="",shape=circle, regular=0, height=0.05,
            width=0.05,style="filled"
        ];
        c0001 [
            label="",shape=circle, regular=0, height=0.05,
            width=0.05,style="filled"
        ];
        c0002 [
            label="",shape=circle, regular=0, height=0.05,
            width=0.05, style="filled"
        ];
        {
            rank=same; rankdir=LR;
            c0000 -> c0001 -> c0002;
        }
    }
    {
        rank=same; rankdir=LR;
        "Son 1" [regular=0];
        "Daughter 1" [regular=0];
        "Son 2" [regular=0];
        m0000 [
            label="",shape=diamond,regular=0,height=0.25,
            width=0.25,style="filled"
        ];
        "Other Daughter 1" [regular=0];
        "Other Son 1" [regular=0];
        "Other Other Son 1" [regular=0];
        m0001 [
            label="",shape=diamond,regular=0,height=0.25,
            width=0.25, style="filled"
        ];
        "Other Daughter 2" [regular=0];
        {
            rank=same; rankdir=LR;
            "Son 2" -> m0000 -> "Other Daughter 1";
            "Other Other Son 1" -> m0001 -> "Other Daughter 2";
        }
    }
    c0000 -> "Son 1";
    c0001 -> "Daughter 1";
    c0002 -> "Son 2";
}

上面的代码产生这个图片，其边缘为Son 1 and Son 2看起来很奇怪。我运行它dot -Tpng tree.dot。当我运行相同的代码时here，我得到预期产出.

难道我做错了什么？如何在不使用 Web 界面的情况下获得预期的输出（我可能有数百个节点）？换句话说，我怎样才能得到c0000 and c0002与中心对齐Son 1 and Son 2，以便它们的边连接到节点的中心顶部？

在此先感谢您的帮助！

您可以使用指定边缘连接的位置ports使用罗盘方向，n，s，e，w，nw，ne，sw，se。

更改点文件末尾的以下行以包含端口。

    c0000 -> "Son 1" [headport=ne];
    c0002 -> "Son 2":nw; // Shorthand for [headport=nw]

结果在这张图片中

这不会将边缘置于死点，并将端口位置更改为n不起作用。但它不再像原来那样有指向空角的边缘。 GraphViz 实用程序的一部分是自动布局，但有时它似乎会覆盖用户的决定（或者是一个错误）。