GraphViz中的并排二叉树

时间:2015-06-17 05:57:15

标签: tree graphviz dot

我正在尝试并排格式化2个(或理想情况下是N个)断开连接的二进制树,我希望格式化为二叉树的“正确”,大致如下:

enter image description here

即使缺少某些节点,其余节点也应保持原样。

我使用this Stack answer中名为tree.gv的脚本为一棵树生成了此平衡的近似值:

dot one_tree.dot | gvpr -c -f tree.gv | neato -n -Tpdf -o tree.pdf

它不是我想要的方式完美平衡,但它非常可行。 enter image description here

现在我想并排多棵树。这是我尝试过的:

dot trees.dot | neato -n -Goverlap=false -Tpdf -o tree.pdf

正确的并排,但底部的黑色叶子应该向右张开,为他们失踪的兄弟姐妹留出空间。

dot trees.dot | gvpr -c -f tree.gv | neato -n -Tpdf -o tree.pdf

每棵树格式正确,但它们重叠。 enter image description here

当然两者结合起来会有效吗?

dot trees.dot | gvpr -c -f tree.gv | neato -n -Goverlap=false -Tpdf -o tree.pdf

enter image description here

以下是trees.dot

digraph BST {
    graph [center=true, margin=0.01, nodesep=0.1, ranksep=0.3, width=1,ratio=.25];
    node [fontname="Arial",style=filled,color="0.0 0.0 0.0",fixedsize=true,width=0.15,shape=circle,label=""];
    node [margin=0.01,fillcolor="lightgrey"];
    edge [dir=none];
    node [fillcolor="black"];
    Lower;
    Lower -> LowerR;
    Lower -> LowerL;
    LowerL -> LowerLR;
    LowerR -> LowerRR;
    node [fillcolor="red"];
    Upper;
    Upper -> UpperR;
    Upper -> UpperL;
}

1 个答案:

答案 0 :(得分:2)

形成树的主要技巧是使用具有高边权的额外不可见节点,然后将其直接放置在父节点下方。外表的顺序很重要。

digraph BST {
    graph [center=true, margin=0.01, nodesep=0.1, ranksep=0.3, width=1,ratio=.25];
    node [fontname="Arial",style=filled,color="0.0 0.0 0.0",fixedsize=true,width=0.15,shape=circle,label=""];
    node [margin=0.01,fillcolor="lightgrey"];
    edge [dir=none];
    node [fillcolor="black"];
    Lower;
    LowerL;
    LowerM [style=invis];
    LowerR;
    Lower -> LowerR;
    Lower -> LowerM [weight=100 style=invis];
    Lower -> LowerL;
    LowerLM [style=invis];
    LowerLR;
    LowerRM [style=invis];
    LowerRR;
    LowerL -> LowerLR;
    LowerL -> LowerLM [weight=100 style=invis];
    LowerR -> LowerRR;
    LowerR -> LowerRM [weight=100 style=invis];
    node [fillcolor="red"];
    Upper;
    UpperR;
    UpperM [style=invis];
    UpperL;
    Upper -> UpperR;
    Upper -> UpperM [weight=100 style=invis];
    Upper -> UpperL;
}

enter image description here

要防止独立树木或树枝水平重叠,您必须使用群集(请参阅我对Making graphviz trees have parents centred above children的回答)

digraph BST {
    graph [center=true, margin=0.01, nodesep=0.1, ranksep=0.3, width=1,ratio=.25];
    node [fontname="Arial",style=filled,color="0.0 0.0 0.0",fixedsize=true,width=0.15,shape=circle,label=""];
    node [margin=0.01,fillcolor="lightgrey"];
    edge [dir=none];
    node [fillcolor="black"];
    graph [style=invis];
    subgraph cluster_Lower {
        Lower;
        LowerL;
        LowerM [style=invis];
        LowerR;
        Lower -> LowerR;
        Lower -> LowerM [weight=100 style=invis];
        Lower -> LowerL;
        LowerLM [style=invis];
        LowerLR;
        LowerRM [style=invis];
        LowerRR;
        LowerL -> LowerLR;
        LowerL -> LowerLM [weight=100 style=invis];
        LowerR -> LowerRR;
        LowerR -> LowerRM [weight=100 style=invis];
    }
    node [fillcolor="red"];
    subgraph cluster_Upper {
        Upper;
        UpperR;
        UpperM [style=invis];
        UpperL;
        Upper -> UpperR;
        Upper -> UpperM [weight=100 style=invis];
        Upper -> UpperL;
    }
}

enter image description here