public static List <Path> GetPathsForPointInGraph(IGraphBasics <Point, IEdgeBasics <Point> > CurrentGraph, Point CurrentPoint)
{
List <Path> currentListPaths = new List <Path>
(
CurrentGraph.EdgeCollection
.Where(i2 => i2.StartPoint.Equals(CurrentPoint))
.Select(i2 =>
{
Path currentPath = Path.InitPath();
currentPath.AddEdge(i2);
return(currentPath);
}));
for (int i = 0; i < currentListPaths.Count(); i++)
{
Path currentPath = currentListPaths[i];
IEnumerable <IEdgeBasics <Point> > candidatesToPath = CurrentGraph.EdgeCollection.Where(i1 => i1.StartPoint.Equals(currentPath.ListPathEdges.Last().EndPoint));
foreach (IEdgeBasics <Point> e in candidatesToPath)
{
if (!currentPath.ListPathPoints.Contains(e.EndPoint))
{
Path newPath = Path.InitPath(currentPath);
newPath.AddEdge(e);
currentListPaths.Add(newPath);
}
}
}
return(currentListPaths);
}
public static bool CheckCycles(IGraphBasics <Point, AbstractEdge <Point> > CurrentGraph)
{
if (CheckSimpleCycles(CurrentGraph))
{
return(true);
}
List <Path> listPaths = CurrentGraph.EdgeCollection.Select <AbstractEdge <Point>, Path>(i1 =>
{
Path path = Path.InitPath();
path.AddEdge(i1);
return(path);
}).ToList();
for (int i = 0; i < listPaths.Count(); i++)
{
Path currentPath = listPaths[i];
IEnumerable <AbstractEdge <Point> > candidatesToPath = CurrentGraph.EdgeCollection.Where(i1 => i1.StartPoint.Equals(currentPath.ListPathEdges.Last().EndPoint));
foreach (Edge e in candidatesToPath)
{
if (currentPath.ListPathPoints.Contains(e.EndPoint))
{
return(true);
}
else
{
Path newPath = Path.InitPath(currentPath);
newPath.AddEdge(e);
listPaths.Add(newPath);
}
}
}
return(false);
}
private bool Check()
{
if (_graph.EdgeCount == 1)
{
Path.AddEdge(_graph.Edges.First());
if (Path.IsDirectedAcyclicGraph())
{
Path.RemoveEdge(_graph.Edges.First());
return(false);
}
return(true);
}
return(false);
}
private void RemoveCycles()
{
var edgesToRemove = new List <TEdge>();
foreach (TEdge edge in _graph.Edges)
{
Path.AddEdge(edge);
if (!Path.IsDirectedAcyclicGraph())
{
edgesToRemove.Add(edge);
_weight.Remove(edge);
}
Path.RemoveEdge(edge);
}
edgesToRemove.ForEach(edge => _graph.RemoveEdge(edge));
}
/// <summary>
/// Edge c'tor. In addition to creating the edge this also checks to
/// make sure it's not a duplicate and adds it to the right path.
/// </summary>
/// <param name="node0"></param>
/// <param name="node1"></param>
public Edge(Node node0, Node node1)
{
this.node0 = node0;
this.node1 = node1;
Path path = node0.Path;
// If the nodes are equal then this is a fake edge used to make
// things work better for paths with only 1 node so don't add it
// to the path.
if (node0 == node1)
{
return;
}
// By default, add this edge to the path that owns the first node.
// But first, see if it's a duplicate.
for (int i = 0; i < path.Edges.Count; i++)
{
Edge e = (Edge)path.Edges[i];
if ((e.Node0 == node0 && e.Node1 == node1) || (e.Node0 == node1 && e.Node1 == node0))
{
// Duplicate, so don't add it.
return;
}
}
path.AddEdge(this);
// Then if the second node belongs to a different path we need to
// merge the second node's path into the first.
if (node0.Path != node1.Path)
{
MergePaths(node0.Path, node1.Path);
}
} // end of Edge c'tor
public Path CalculateEdgeBasedPath(GraphNode start, GraphNode end)
{
timer.Start();
Edge currentEdge = new Edge();
//remove old path
m_ComputedPath.ClearPath();
//empty old lists
foreach (GraphNode node in m_OpenGraphNodes)
{
node.m_open = false;
}
m_OpenGraphNodes.Clear();
m_OpenGraphNodes.TrimExcess();
foreach (GraphNode node in m_ClosedGraphNodes)
{
node.m_closed = false;
}
m_ClosedGraphNodes.Clear();
m_ClosedGraphNodes.TrimExcess();
//add inital node
m_OpenGraphNodes.Add(start);
start.m_open = true;
while (m_OpenGraphNodes.Count != 0 || (m_currentGraphNode.m_closed && m_currentGraphNode != end))
{
if (m_OpenGraphNodes.Count == 0)
{
m_pathSuccessful = false;
break;
}
m_currentGraphNode = m_OpenGraphNodes[0];
m_OpenGraphNodes.RemoveAt(0);
m_currentGraphNode.m_open = false;
m_ClosedGraphNodes.Add(m_currentGraphNode);
m_currentGraphNode.m_closed = true;
if (m_currentGraphNode == end)
{
m_pathSuccessful = true;
break;
}
for (int i = 0; i < m_currentGraphNode.m_AdjacentNodes.Count; i++)// (Node adjacent in m_current.m_AdjacentNodes)
{
currentEdge = m_currentGraphNode.m_ConnectedEdges[i];
if (m_currentGraphNode.m_AdjacentNodes[i].m_walkable == false || m_currentGraphNode.m_AdjacentNodes[i].m_closed)
{
continue;
}
if (!m_currentGraphNode.m_AdjacentNodes[i].m_open)
{
m_OpenGraphNodes.Add(m_currentGraphNode.m_AdjacentNodes[i]);
m_currentGraphNode.m_AdjacentNodes[i].m_open = true;
m_currentGraphNode.m_AdjacentNodes[i].m_Parent = m_currentGraphNode;
m_currentGraphNode.m_AdjacentNodes[i].m_ParentEdge = currentEdge;
m_currentGraphNode.m_AdjacentNodes[i].CalculateEdgeBasedLocalFGH(end, currentEdge.m_traversalCost);
//resort list
m_OpenGraphNodes.Sort((node1, node2) => node1.m_FCost.CompareTo(node2.m_FCost));
}
if (m_currentGraphNode.m_AdjacentNodes[i].m_open && m_currentGraphNode.m_AdjacentNodes[i].m_GCost < m_currentGraphNode.m_GCost)
{
m_currentGraphNode.m_AdjacentNodes[i].m_Parent = m_currentGraphNode;
m_currentGraphNode.m_AdjacentNodes[i].m_ParentEdge = currentEdge;
m_currentGraphNode.m_AdjacentNodes[i].CalculateEdgeBasedLocalFGH(end, currentEdge.m_traversalCost);
//resort list
m_OpenGraphNodes.Sort((node1, node2) => node1.m_FCost.CompareTo(node2.m_FCost));
}
}
//sort open by f (lowest first)
m_OpenGraphNodes.Sort((node1, node2) => node1.m_FCost.CompareTo(node2.m_FCost));
}
//~while
timer.Stop();
if (m_pathSuccessful)
{
//build path
m_currentGraphNode = end;
while (m_currentGraphNode != start)
{
m_ComputedPath.AddNode(m_currentGraphNode);
if (m_currentGraphNode.m_ParentEdge != null)
{
m_ComputedPath.AddEdge(m_currentGraphNode.m_ParentEdge);
}
//if no parent assume its the start
if (m_currentGraphNode.m_Parent != null)
{
m_currentGraphNode = m_currentGraphNode.m_Parent;
}
else
{
break;
}
}
if (m_currentGraphNode == start)
{
m_ComputedPath.AddNode(m_currentGraphNode);
}
//~while
}
else
{
Debug.LogWarning("No Path!");
return(null);
}
Debug.Log("Time taken to Calculate Path: " + (float.Parse(timer.ElapsedTicks.ToString()) / 10000).ToString() + "ms");
timer.Reset();
return(m_ComputedPath);
}
public void Search()
{
List <Edge> edges = new List <Edge>();
List <Edge> pathEdges = new List <Edge>();
Node startNode = null;
int min = 0;
bool isEnded = false;
foreach (Node node in Graph.Nodes)
{
if (node.Identifier == "s")
{
startNode = node;
}
}
while (!isEnded)
{
if (startNode == null)
{
startNode = pathEdges[pathEdges.Count - 1].End;
}
foreach (Edge edge in Graph.Edges)
{
if (edge.Start.Equals(startNode))
{
edges.Add(edge);
}
}
for (int i = 0; i < edges.Count - 1; i++)
{
if (edges[min].Weight > edges[i + 1].Weight)
{
min = i + 1;
}
}
pathEdges.Add(edges[min]);
min = 0;
startNode = null;
edges.Clear();
if (pathEdges[pathEdges.Count - 1].End.Identifier == "e")
{
isEnded = true;;
}
}
Path path = new Path();
foreach (Edge edge in pathEdges)
{
path.AddEdge(edge);
}
PathConstanse.AddPath(path);
PathConstanse.SetShortestPath();
}