private static Graph RandomConnectedGraphInternal(int vertexCount, int edgeCount, Random random)
{
var ids = Enumerable.Range(0, vertexCount);
var graph = new MutableGraph();
graph.Vertices.AddRange(VerticesInIdRange(0, vertexCount));
var vertices = graph.Vertices.ToDictionary(v => v.Id);
// making graph connected
foreach (var id in ids)
{
var otherId = random.Next(id);
if (id > 0)
{
var edge = new MutableEdge {
Vertex1 = vertices[id], Vertex2 = vertices[otherId], Label = $"e{id}:{otherId}"
};
graph.Edges.Add(edge);
}
}
// adding remaining vertices
foreach (var edgeId in Enumerable.Range(vertexCount, edgeCount - vertexCount + 1))
{
var id1 = random.Next(vertexCount);
var id2 = random.Next(vertexCount);
var edge = new MutableEdge {
Vertex1 = vertices[id1], Vertex2 = vertices[id2], Label = $"e{id1}:{id2}"
};
graph.Edges.Add(edge);
}
return(graph.ToImmutable());
}
public static Edge ToImmutable(this MutableEdge mutable, GraphIndex index)
{
return(new Edge(index.Vertices[mutable.Vertex1.Id], index.Vertices[mutable.Vertex2.Id], mutable.Label));
}
public static Edge ToImmutable(this MutableEdge mutable)
{
return(new Edge(mutable.Vertex1.ToImmutable(), mutable.Vertex2.ToImmutable(), mutable.Label));
}