public void AreAdjacentReturnsTrue()
{
_simpleDirectedGraph.AddEdge("A", "B", "L1");
_simpleDirectedGraph.AddEdge("A", "C", "L2");
Assert.That(_simpleDirectedGraph.AreAdjacent("A", "B"), Is.True);
Assert.That(_simpleDirectedGraph.AreAdjacent("A", "C"), Is.True);
}
void BuildLineGraph()
{
int n = _graph.N;
_edges = new List <Tuple <int, int> >();
for (int i = 0; i < n; i++)
{
for (int j = i + 1; j < n; j++)
{
if (_graph.AreAdjacent(i, j))
{
_edges.Add(new Tuple <int, int>(i, j));
}
}
}
var meets = new bool[_edges.Count, _edges.Count];
for (int i = 0; i < _edges.Count; i++)
{
for (int j = i + 1; j < _edges.Count; j++)
{
if (_edges[i].Item1 == _edges[j].Item1 ||
_edges[i].Item1 == _edges[j].Item2 ||
_edges[i].Item2 == _edges[j].Item1 ||
_edges[i].Item2 == _edges[j].Item2)
{
meets[i, j] = meets[j, i] = true;
}
}
}
_lineGraph = new TGraph();
_lineGraph.Initialize(meets);
}
public List <DistanceModel <T> > Dijkstra(IGraph <T> graph, IVertex <T> start)
{
graph.GetVertices().ForEach(v => v.UnVisit());
var list = new List <DistanceModel <T> > {
new DistanceModel <T>(start, 0, start)
};
var matrix = graph.GetMatrix();
var current = start;
while (graph.UnVisitedVertices().Any())
{
current.Visit();
for (int i = 0; i < graph.GetMaxSize(); i++)
{
var neighbour = graph.GetVertices().FirstOrDefault(v => v.GetIndex() == i);
if (graph.AreAdjacent(current, neighbour))
{
var tentativeDist = GetModel(list, current).Distance() + matrix[current.GetIndex(), i];
if (ContainsAndGreater(list, neighbour, tentativeDist))
{
var neighbourModel = GetModel(list, neighbour);
neighbourModel.ChangeDistance(tentativeDist);
neighbourModel.ChangePrevios(current);
}
else if (!Contains(list, neighbour))
{
list.Add(new DistanceModel <T>(neighbour, tentativeDist, current));
}
}
}
current = MinUnvisitedVertex(list);
}
return(list);
}