使用Graphviz强制边缘上的方形角

Question

我有以下的.dot文件。

digraph
{
    node [color=Limegreen,fontcolor=Limegreen,shape=oval]
    ilocus [label="iLocus"]
    gilocus [label="giLocus"]
    pilocus [label="piLocus"]
    nilocus [label="niLocus"]
    silocus [label="siLocus"]
    cilocus [label="ciLocus"]
    filocus [label="fiLocus"]
    iilocus [label="iiLocus"]

    node [color=Blue,fontcolor=Blue,shape=diamond]
    containgene [label="Contains gene(s)?"]
    proteincoding [label="Protein coding?"]
    multiplegenes [label="Multiple genes?"]
    geneflank [label="Flanked by genes\non both sides?"]

    ilocus -> containgene
    containgene:e -> geneflank [xlabel="No"]
    geneflank:e -> filocus [xlabel="No"]
    geneflank:w -> iilocus [xlabel="Yes"]
    containgene:w -> gilocus [xlabel="Yes"]
    gilocus -> proteincoding
    proteincoding:e -> nilocus [xlabel="No"]
    proteincoding:w -> pilocus [xlabel="Yes"]
    pilocus -> multiplegenes
    multiplegenes:e -> silocus [xlabel="No"]
    multiplegenes:w -> cilocus [xlabel="Yes"]
}

使用graphviz进行渲染，我得到了以下结果。

有没有办法让边缘呈现方形角而不是圆角？文档中的splines=ortho属性原则上似乎是为此设计的，但实际上，当我在我的有向图中添加graph [splines=ortho]时，只会得到直线。

有没有办法在graphviz中获得边缘的方形角？类似于以下内容：

  ------ Multiple genes? -----
  |                          |
  | N                      Y |
  |                          |
  v                          V
siLocus                   ciLocus

- Daniel Standage

Answer 1

也许你可以先使用splines=line来开始。

digraph
{
    splines=line
    ...

这将会给你这样的图表：

接下来，你可能需要手动调整节点位置，或者插入隐藏的节点和边，比如：

digraph
{
    splines=line

    node [color=Limegreen,fontcolor=Limegreen,shape=oval]
    ilocus [label="iLocus"]
    gilocus [label="giLocus"]
    pilocus [label="piLocus"]
    nilocus [label="niLocus"]
    silocus [label="siLocus"]
    cilocus [label="ciLocus"]
    filocus [label="fiLocus"]
    iilocus [label="iiLocus"]

    node [color=Blue,fontcolor=Blue,shape=diamond]
    containgene [label="Contains gene(s)?"]
    proteincoding [label="Protein coding?"]
    multiplegenes [label="Multiple genes?"]
    geneflank [label="Flanked by genes\non both sides?"]

    spacer1 [label="xxxx",style=invis]
    {rank=same gilocus spacer1 geneflank}
    gilocus -> spacer1 -> geneflank [style=invis]

    ilocus -> containgene
    containgene:e -> geneflank [xlabel="No"]
    geneflank:e -> filocus [xlabel="No"]
    geneflank:w -> iilocus [xlabel="Yes"]
    containgene:w -> gilocus [xlabel="Yes"]
    gilocus -> proteincoding
    proteincoding:e -> nilocus [xlabel="No"]
    proteincoding:w -> pilocus [xlabel="Yes"]
    pilocus -> multiplegenes
    multiplegenes:e -> silocus [xlabel="No"]
    multiplegenes:w -> cilocus [xlabel="Yes"]
}

该操作会生成：

或者，您可以在顶部标签中插入空格，以使下方节点对齐更好：

digraph
{
    splines=line

    node [color=Limegreen,fontcolor=Limegreen,shape=oval]
    ilocus [label="iLocus"]
    gilocus [label="giLocus"]
    pilocus [label="piLocus"]
    nilocus [label="niLocus"]
    silocus [label="siLocus"]
    cilocus [label="ciLocus"]
    filocus [label="fiLocus"]
    iilocus [label="iiLocus"]

    node [color=Blue,fontcolor=Blue,shape=diamond]
    containgene [label="    Contains gene(s)?   "]
    proteincoding [label="Protein coding?"]
    multiplegenes [label="Multiple genes?"]
    geneflank [label="Flanked by genes\non both sides?"]

    ilocus -> containgene
    containgene:e -> geneflank [xlabel="No"]
    geneflank:e -> filocus [xlabel="No"]
    geneflank:w -> iilocus [xlabel="Yes"]
    containgene:w -> gilocus [xlabel="Yes"]
    gilocus -> proteincoding
    proteincoding:e -> nilocus [xlabel="No"]
    proteincoding:w -> pilocus [xlabel="Yes"]
    pilocus -> multiplegenes
    multiplegenes:e -> silocus [xlabel="No"]
    multiplegenes:w -> cilocus [xlabel="Yes"]
}

这将产生：

- jpsecher

---

确实很有帮助，但令人沮丧的是，例如在“是否包含基因？”和“两侧是否被基因夹住？”之间的“否”边缘上无法获得90度角。 - Daniel Standage

Answer 2

您可以简单地使用 splines=false (GraphvizFiddle链接)。

- marapet

---

也许我的解释不够清晰。我已经更新了内容，以准确展示我所说的“方形角落”。 - Daniel Standage

啊，抱歉，我误解了。不幸的是，正交很少做人们想要它做的事情... - marapet