Ejemplo n.º 1
0
        private void ReportCycle(TNode node, AbstractDiGraph <TNode> graph)
        {
            var cycle = new GraphPath <TNode>();

            _allcycles.Add(cycle);
            cycle.SourceNode      = node;
            cycle.DestinationNode = node;
            cycle.Path            = new List <TNode>();

            List <TNode> stacklist = _vStack.ToList();

            int i = 0;

            while (!stacklist[i].Equals(node))
            {
                i++;
            }

            for (; i >= 0; i--)
            {
                cycle.Path.Add(stacklist[i]);
            }
            cycle.Path.Add(node);

            cycle.PathWeight = 0;
            for (int j = 1; j < cycle.Path.Count; j++)
            {
                cycle.PathWeight += graph.GetEdgeWeight(cycle.Path[j - 1], cycle.Path[j]);
            }
        }
Ejemplo n.º 2
0
        private void Reportpath(TNode node, TNode dnode, AbstractDiGraph <TNode> graph)
        {
            var path = new GraphPath <TNode>();

            _allpaths.Add(path);
            path.SourceNode      = node;
            path.DestinationNode = dnode;
            path.Path            = new List <TNode>();

            List <TNode> stacklist = _vStack.ToList();

            int i = 0;

            while (!stacklist[i].Equals(node))
            {
                i++;
            }

            for (; i >= 0; i--)
            {
                path.Path.Add(stacklist[i]);
            }
            path.Path.Add(dnode);

            path.PathWeight = 0;
            for (int j = 1; j < path.Path.Count; j++)
            {
                path.PathWeight += graph.GetEdgeWeight(path.Path[j - 1], path.Path[j]);
            }
        }
Ejemplo n.º 3
0
        public List <AbstractGraphPath <TNode> > FindCycles(List <DepthFirstSearchEdge <TNode> > depthFirstSearchEdges,
                                                            TNode sourceVertex, int maxStops)
        {
            var cycles = new List <AbstractGraphPath <TNode> >();

            foreach (
                var allDFSBackEdges in depthFirstSearchEdges.Where(x => x.EdgeType == DepthFirstSearchEdgeType.BackEdge)
                )
            {
                var sourceNode = allDFSBackEdges.DestinationNode;

                foreach (
                    var backEdge in
                    depthFirstSearchEdges.Where(
                        x => x.EdgeType == DepthFirstSearchEdgeType.BackEdge && x.DestinationNode.Equals(sourceNode))
                    )
                {
                    var cycle = new GraphPath <TNode>()
                    {
                        SourceNode = sourceNode, DestinationNode = sourceNode
                    };
                    cycle.Path = new List <TNode>()
                    {
                        sourceNode
                    };
                    cycle.PathWeight = 0;
                    var treeEdges   = depthFirstSearchEdges.Where(x => x.EdgeType == DepthFirstSearchEdgeType.TreeEdge);
                    var treeEdge    = treeEdges.Single(x => x.SourceNode.Equals(sourceNode));
                    int nodeCounter = 2;
                    while (!treeEdge.DestinationNode.Equals(backEdge.SourceNode) &&
                           !IsMaxNodeLimitReached(maxStops, nodeCounter))
                    {
                        cycle.PathWeight += treeEdge.EdgeWeight;
                        cycle.Path.Add(treeEdge.DestinationNode)
                        ;
                        treeEdge = treeEdges.Single(x => x.SourceNode.Equals(treeEdge.DestinationNode));
                    }
                    cycle.Path.Add(backEdge.SourceNode);
                    cycle.Path.Add(backEdge.DestinationNode);
                    cycle.PathWeight += backEdge.EdgeWeight;
                    if (!IsMaxNodeLimitReached(maxStops, nodeCounter))
                    {
                        cycles.Add(cycle);
                    }
                }
            }

            return(cycles);
        }
Ejemplo n.º 4
0
 private void Initialise(AbstractDiGraph <TNode> graph, TNode sourceNode)
 {
     foreach (var node in graph.AllNodes.Where(x => !x.Equals(sourceNode)))
     {
         var shortestPathNode = new GraphPath <TNode>();
         shortestPathNode.DestinationNode = node;
         shortestPathNode.PathWeight      = Infinity;
         shortestPathNode.SourceNode      = sourceNode;
         _estimatedDistances.Add(node, shortestPathNode);
         _shortestPathUnKnownNodesQueue.Add(shortestPathNode);
     }
     //Source Node Initialise
     _estimatedDistances.Add(sourceNode,
                             new GraphPath <TNode>()
     {
         DestinationNode = sourceNode, SourceNode = sourceNode
     });
     _estimatedDistances[sourceNode].PathWeight = 0;
     _shortestPathKnownNodes.Add(sourceNode);
 }