在 Graphviz 有向图中对齐节点答案

【问题标题】：Align nodes in a Graphviz directed graph在 Graphviz 有向图中对齐节点
【发布时间】：2019-04-14 13:40:41
【问题描述】：

我有以下 Graphviz 代码：

digraph {
  Technique [shape = box];
  Path [shape = box];
  KnowledgeObservation [shape = box, label = "Knowledge\nObservation"];
  ManagementIntervention [shape = box, label = "Management\nIntervention"];
  ResultsModification [shape = box, label = "Results\nModification"];
  SharedCode [label = "Shared Code"];
  MediatedRelationship [label = "Mediated Relationship"];
  Art -> Technique;
  Therapy -> Path;
  {Technique Path} -> KnowledgeObservation -> ManagementIntervention -> ResultsModification;
  {MediatedRelationship SharedCode} -> {KnowledgeObservation ResultsModification}

  subgraph {
    rank = same
    Technique -> Path [dir = none]
  }

  subgraph {
    rank = same
    SharedCode
    ManagementIntervention
    MediatedRelationship     
  }
}

它当前产生以下输出：

如何将“管理干预”与“知识观察”和“结果修改”垂直对齐？

“共享代码”应移至“管理干预”的左侧。

“中介关系”应移至“管理干预”右侧。

“共享代码”、“管理干预”和“中介关系”应保持水平对齐。

我怎样才能做到这一点？

【问题讨论】：

标签： graphviz

【解决方案1】：

这可以在没有子图的情况下实现；最重要的修改是行

{ rank = same; SharedCode -> ManagementIntervention -> MediatedRelationship[ style = invis ] }

这不仅使三个节点保持在正确的级别上，而且保持在所需的顺序内。

总之，这段代码在这里

digraph 
{
  // node definition
  Art Therapy;
  Technique[ shape = box ];
  Path[ shape = box ];
  KnowledgeObservation[ shape = box, label = "Knowledge\nObservation" ];
  ManagementIntervention[ shape = box, label = "Management\nIntervention" ];
  ResultsModification[ shape = box, label = "Results\nModification" ];
  SharedCode[ label = "Shared Code" ];
  MediatedRelationship[ label = "Mediated Relationship" ];

  // edges
  Art -> Technique;
  Therapy -> Path;
  { rank = same; Technique -> Path [dir = none] }
  { Technique Path} -> KnowledgeObservation -> ManagementIntervention -> ResultsModification;
  { rank = same; SharedCode -> ManagementIntervention -> MediatedRelationship[ style = invis ] } 

  { MediatedRelationship SharedCode } -> { KnowledgeObservation ResultsModification }
}

给你

据我了解，这就是您要查找的内容。

我还是建议用这三个替换最后一行代码

KnowledgeObservation -> { SharedCode MediatedRelationship }[ dir = back ];
SharedCode -> ResultsModification;
MediatedRelationship -> ResultsModification;

原因是，一旦您的图表变得更加复杂，graphviz 将识别并维护层级关系，而不是以令人惊讶的方式解释模棱两可的指令。

【讨论】：

【解决方案2】：

如何将“管理干预”与“知识观察”和“结果修改”垂直对齐？

这可以通过增加边缘的weight 来实现。 weight 较高的边缘往往比较低的边缘更直且更短。

“中介关系”应移至“管理干预”的右侧。

您可以通过定义节点的顺序来控制它。如果您在“共享代码”之前定义“管理干预”，它 (MI) 将首先绘制，即。例如，在 SI 的左侧。

“共享代码”、“管理干预”和“中介关系”应保持水平对齐。

你做对了，使用 rank=same 子图属性。虽然我会把子图放在节点定义的那一刻。这将缩短源大小并将排名规范限制在定义节点的地方，这有利于可读性（所有内容都在一个地方说明）。

您修改后的示例：

digraph {
  Technique [shape = box];
  Path [shape = box];
  KnowledgeObservation [shape = box, label = "Knowledge\nObservation"];
  ResultsModification [shape = box, label = "Results\nModification"];
  subgraph {
    rank=same

    ManagementIntervention [shape = box, label = "Management\nIntervention"];
    MediatedRelationship [label = "Mediated Relationship"];
    SharedCode [label = "Shared Code"];
  }
  Art -> Technique;
  Therapy -> Path;
  {Technique Path} -> KnowledgeObservation
  KnowledgeObservation -> ManagementIntervention -> ResultsModification [weight=3]
  {MediatedRelationship SharedCode} -> {KnowledgeObservation ResultsModification}

  subgraph {
    rank = same
    Technique -> Path [dir = none]
  }
}

结果：

【讨论】：