public override bool Equals(object obj)
{
GraphVertex <K, T> objitem = obj as GraphVertex <K, T>;
var otherval = objitem.Face;
return(otherval.Equals(this.Face));
}
/// <summary>
/// actually construct list of graph verts with stored faces and edges
/// iterates dictionary of edges to faces and building graph
/// </summary>
/// <param name="faces"></param>
/// <param name="edgeDict"></param>
/// <returns></returns>
public static List <GraphVertex <K, T> > GenGraph <T, K>(List <T> facelikes, Dictionary <K, List <T> > edgeDict)
where K : IUnfoldableEdge
where T : IUnfoldablePlanarFace <K>
{
List <GraphVertex <K, T> > graph = new List <GraphVertex <K, T> >();
// first build the graph nodes, just referencing faces
foreach (T face in facelikes)
{
var CurrentVertex = new GraphVertex <K, T>(face);
graph.Add(CurrentVertex);
}
// then build edges, need to use edge dict to do this
foreach (GraphVertex <K, T> vertex in graph)
{
T facelike = vertex.Face;
foreach (K edgelike in facelike.EdgeLikeEntities)
{
//var edgekey = new EdgeLikeEntity(edge);
// again we dont need to generate a new key with this wrapper - already stored on the face in this form
var edgekey = edgelike;
// find adjacent faces in the dict
var subfaces = edgeDict[edgekey];
// find the graph verts that represent these faces
var verts = GraphUtilities.FindNodesByMatchingFaces(graph, subfaces);
//remove dupe faces, not sure if these should really be removed
verts = verts.Distinct().ToList();
//need to remove self loops
//build list of toremove, then remove them
var toremove = new List <GraphVertex <K, T> >();
foreach (GraphVertex <K, T> testvert in verts)
{
if (testvert == vertex)
{
toremove.Add(testvert);
}
}
verts = verts.Except(toremove).ToList();
// these are the verts this edge connects
foreach (var VertToConnectTo in verts)
{
K wrappedEdgeOnThisGraphEdge = GraphUtilities.FindRealEdgeByTwoFaces <T, K>(graph, subfaces, edgeDict);
var CurrentGraphEdge = new GraphEdge <K, T>(wrappedEdgeOnThisGraphEdge, vertex, VertToConnectTo);
vertex.GraphEdges.Add(CurrentGraphEdge);
}
}
}
return(graph);
}
public GraphEdge(K edge, GraphVertex <K, T> tail, GraphVertex <K, T> head)
{
Tail = tail;
Head = head;
GeometryEdge = edge;
}
// be careful here, modifying the verts may causing issues,
// might be better to create new verts, or implement Icloneable
public static List <GraphVertex <K, T> > BFS <K, T>(List <GraphVertex <K, T> > graph)
where T : IUnfoldablePlanarFace <K>
where K : IUnfoldableEdge
{
var graphToTraverse = graph;
// this is a clone of the graph that we modify to store the tree edges on
//var graphToTraverse = GraphUtilities.CloneGraph<K, T>(graph);
// this is the final form of the graph, we can replace references to the graph edges with only tree edges
// and treat this tree as a graph
List <GraphVertex <K, T> > TreeTransformedToGraph;
// now can start actually traversing the graph and building a tree.
Queue <GraphVertex <K, T> > Q = new Queue <GraphVertex <K, T> >();
foreach (var node in graphToTraverse)
{
if (node.Explored == false)
{
GraphVertex <K, T> root = node;
root.FinishTime = 0;
root.Parent = null;
Q.Enqueue(root);
}
while (Q.Count > 0)
{
GraphVertex <K, T> CurrentVertex = Q.Dequeue();
foreach (GraphEdge <K, T> vedge in CurrentVertex.GraphEdges)
{
GraphVertex <K, T> V = vedge.Head;
if (V.Explored == false)
{
V.Explored = true;
V.FinishTime = CurrentVertex.FinishTime + 1;
V.Parent = CurrentVertex;
CurrentVertex.TreeEdges.Add(vedge);
Q.Enqueue(V);
}
}
// look at BFS implementation again - CLRS ? colors? I am mutating verts too many times?
// check how many times this loop is running with acounter
CurrentVertex.Explored = true;
}
}
//TreeTransformedToGraph = GraphUtilities.CloneGraph<K, T>(graphToTraverse);
// set the grap edges to the tree edges incase
// we want to use general graph algos on the tree;
/* foreach (var Vertex in graphToTraverse)
* {
* Vertex.GraphEdges = Vertex.TreeEdges;
* Vertex.TreeEdges.Clear();
*
* }
*/
return(graphToTraverse);
}
