使用graphviz在边上强制方形角

我有以下

.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渲染我得到以下结果

有什么办法可以强制边缘具有方形角而不是圆角？文档中的

spline=ortho

属性在原则上似乎就是为此而设计的，但在实践中，当我向有向图中添加

graph[spline=ortho]

时，我只得到了直线

我能用graphviz在边上画出直角吗？如下所示：

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

---

您可以简单地使用

spline=false

（）。

也许您可以先使用

spline=line

digraph
{
    splines=line
    ...

这将为您提供以下图表：

从那里，您可能需要手动定位节点，或插入隐藏的节点和边，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"]
}

产生

或者，可以在顶部标签中插入空格，以使较低的节点更好地对齐：

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"]
}

产生

---

也许我的解释不清楚。我已经更新了，以准确地说明我所说的“方角”是什么意思。啊，对不起，我误解了。不幸的是，ortho很少做人们希望它做的事情……肯定是有帮助的，但令人沮丧的是，我无法获得90°的角度，例如，“包含基因”和“两侧都有基因”之间的“无”边。