如何将自定义双向图从 QuickGraph 应用于 Graph# 的 GraphLayout？

发布于 2024-08-24 09:18:53 字数 1150 浏览 6 评论 0 原文

怎么了？

    using QuickGraph;
    using GraphSharp;

     public class State
        {
            public string Name { get; set; }
            public override string ToString()
            {
                return Name;
            }
        }

     public class Event
        {
            public string Name;
            public override string ToString()
            {
                return Name;
            }
        }

    BidirectionalGraph<State, TaggedEdge<State, Event>> x =
                    new BidirectionalGraph<State, TaggedEdge<State, Event>>();

    GraphLayout graphLayout = new GraphLayout();
    graphLayout.Graph = x;

错误：

无法将类型 QuickGraph.Bi DirectionGraph> 隐式转换为 QuickGraph.IBi DirectionGraph ;>。存在显式转换（您是否缺少强制转换？）

如果我进行强制转换，则应用程序在启动时会出现错误错误，而没有任何信息

出了什么问题？

原文

Whats wrong?

    using QuickGraph;
    using GraphSharp;

     public class State
        {
            public string Name { get; set; }
            public override string ToString()
            {
                return Name;
            }
        }

     public class Event
        {
            public string Name;
            public override string ToString()
            {
                return Name;
            }
        }

    BidirectionalGraph<State, TaggedEdge<State, Event>> x =
                    new BidirectionalGraph<State, TaggedEdge<State, Event>>();

    GraphLayout graphLayout = new GraphLayout();
    graphLayout.Graph = x;

Error:

Cannot implicitly convert type QuickGraph.BidirectionalGraph<ChashaGraphSharp.State,QuickGraph.TaggedEdge<ChashaGraphSharp.State,ChashaGraphSharp.Event>> to QuickGraph.IBidirectionalGraph<object,QuickGraph.IEdge<object>>. An explicit conversion exists (are you missing a cast?)

If I put the cast, then application gets fault error on start without any information

What's wrong?

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佞臣 2024-08-31 09:18:53

您需要使用 IEdge 类型而不是 TaggedEdge 创建 BidirectionGraph 实例：

BidirectionalGraph<State, IEdge<State, Event>> x =
                new BidirectionalGraph<State, IEdge<State, Event>>();

我不能说我完全理解为什么会出现这种情况，但是上面的方法应该可行。

编辑：我问了一个问题解释了为什么这个演员阵容不起作用。

You need to create your instance of BidirectionGraph using the type IEdge instead of TaggedEdge:

BidirectionalGraph<State, IEdge<State, Event>> x =
                new BidirectionalGraph<State, IEdge<State, Event>>();

I can't say that I fully understand why this is the case, however the above should work.

EDIT: I asked a question that kind of explains why this cast doesn't work.

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給妳壹絲溫柔 2024-08-31 09:18:53

如果您使用自定义图表（IE 不是“Bi DirectionGraph”）
您需要使用继承自“ContextualGraphLayout”的自定义 GraphLayout

此处，不要使用“GraphLayout”，而是使用“ContextualGraphLayout” >，双向图<状态，边缘<状态>>>”。

我强烈建议创建虚拟模型类以获得可读性。
例如：

public MyVertex : 状态 { }
公共 MyEdge : Edge {
   公共 MyEdge（MyVertex 源、MyVertex 目标）
      ：基础（源，目标）{}

}

public MyGraph : Bi DirectionGraph; { }
公共MyGraphLayout：ContextualGraphLayout {
    公共 MyGraphLayout () : base() { }

    公共MyGraphLayout（布尔allowParallelEdges）
        : 基(allowParallelEdges) { }

    公共MyGraphLayout（布尔allowParallelEdges，int vertexCapacity）
        ：基础（allowParallelEdges，vertexCapacity）{}

}

If you use a custom graph (IE not a "BidirectionalGraph<Object, IEdge<Object>")
You need to use a custom GraphLayout that inherits from "ContextualGraphLayout"

Here, instead of using "GraphLayout" use "ContextualGraphLayout<State,Edge<<State>>,BidirectionalGraph<State, Edge<State>>>".

I strongly advise to create dummy model classes to gain readability.
For instance:

public MyVertex : State { }
public MyEdge : Edge<MyVertex> {
   public MyEdge (MyVertex source, MyVertex target)
      : base(source, target) { }

}

public MyGraph : BidirectionalGraph<MyVertex, MyEdge> { }
public MyGraphLayout : ContextualGraphLayout<MyVertex, MyEdge, MyGraph> {
    public MyGraphLayout () : base() { }

    public MyGraphLayout (bool allowParallelEdges)
        : base(allowParallelEdges) { }

    public MyGraphLayout (bool allowParallelEdges, int vertexCapacity)
        : base(allowParallelEdges, vertexCapacity) { }

}

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