/// <summary>
/// Return a complement graph
/// If the graph is not initialized throws GraphInitializationException
/// </summary>
/// <param name="graph">graph</param>
/// <returns>complement graph</returns>
public static IGraphInterface ComplementGraph(IGraphInterface graph)
{
// Variable
IGraphEdgeListInterface complementGraph;
List <IVertexInterface> vertexList;
List <IVertexInterface> neighboursList;
List <IVertexInterface> intersectionVertexAndNeighboursList;
if (!graph.GetIsInitialized())
{
throw new MyException.GraphException.GraphInitializationException();
}
complementGraph = new GraphEdgeList(graph.GetRealCountVertices());
complementGraph.SetName("Complement graph - " + graph.GetName());
vertexList = graph.AllVertices();
// Add edges
foreach (IVertexInterface vertex in vertexList)
{
neighboursList = graph.Neighbours(vertex);
neighboursList.Add(vertex);
intersectionVertexAndNeighboursList = vertexList.FindAll(v => !neighboursList.Contains(v)).ToList();
if (intersectionVertexAndNeighboursList.Count == 0)
{
complementGraph.AddVertex(vertex.GetUserName());
continue;
}
foreach (IVertexInterface neighbour in intersectionVertexAndNeighboursList)
{
complementGraph.AddEdge(vertex.GetUserName(), neighbour.GetUserName());
}
}
complementGraph.InitializeGraph();
return(complementGraph);
}