/// <summary>
/// replace edges (av) and (vb) with edge (ab) on a given path
/// </summary>
void UpdatePath(PathOnEdge pathOnEdge, int v, MetroEdge newEdge)
{
LinkedListNode <MetroEdge> f = pathOnEdge.node;
Debug.Assert(f.Value.Source() == v || f.Value.Target() == v);
int a, b;
a = OppositeNode(f.Value, v);
if (f.Next != null && (b = OppositeNode(f.Next.Value, v)) != -1)
{
Debug.Assert((a == newEdge.Source() || a == newEdge.Target()));
Debug.Assert((b == newEdge.Source() || b == newEdge.Target()));
f.Value = newEdge;
f.List.Remove(f.Next);
}
else if (f.Previous != null && (b = OppositeNode(f.Previous.Value, v)) != -1)
{
Debug.Assert((a == newEdge.Source() || a == newEdge.Target()));
Debug.Assert((b == newEdge.Source() || b == newEdge.Target()));
f.Value = newEdge;
f.List.Remove(f.Previous);
}
else
{
throw new NotSupportedException();
}
}
void InitPathData()
{
paths = new Dictionary <int, LinkedList <MetroEdge> >();
e2p = new Dictionary <MetroEdge, PathList>();
for (int mi = 0; mi < Metrolines.Count; mi++)
{
int[] Metroline = Metrolines[mi];
paths.Add(mi, new LinkedList <MetroEdge>());
for (int i = 0; i + 1 < Metroline.Length; i++)
{
MetroEdge me = MetroEdge.CreateFromTwoNodes(Metroline[i], Metroline[i + 1]);
if (!e2p.ContainsKey(me))
{
PathList pl = new PathList();
pl.edge = me;
pl.paths = new HashSet <PathOnEdge>();
e2p.Add(me, pl);
}
PathOnEdge pathOnEdge = new PathOnEdge();
pathOnEdge.index = mi;
pathOnEdge.node = paths[mi].AddLast(me);
e2p[me].paths.Add(pathOnEdge);
}
}
}
/// <summary>
/// extract the next edge on a given path after node v
/// </summary>
MetroEdge FindNextEdgeOnPath(int v, PathOnEdge pathOnEdge)
{
if (pathOnEdge.node.Next != null)
{
int o = OppositeNode(pathOnEdge.node.Next.Value, v);
if (o != -1)
{
return(pathOnEdge.node.Next.Value);
}
}
if (pathOnEdge.node.Previous != null)
{
int o = OppositeNode(pathOnEdge.node.Previous.Value, v);
if (o != -1)
{
return(pathOnEdge.node.Previous.Value);
}
}
throw new NotSupportedException();
}
/// <summary>
/// replace edges (av) and (vb) with edge (ab) on a given path
/// </summary>
void UpdatePath(PathOnEdge pathOnEdge, int v, MetroEdge newEdge) {
LinkedListNode<MetroEdge> f = pathOnEdge.node;
Debug.Assert(f.Value.Source() == v || f.Value.Target() == v);
int a, b;
a = OppositeNode(f.Value, v);
if (f.Next != null && (b = OppositeNode(f.Next.Value, v)) != -1) {
Debug.Assert((a == newEdge.Source() || a == newEdge.Target()));
Debug.Assert((b == newEdge.Source() || b == newEdge.Target()));
f.Value = newEdge;
f.List.Remove(f.Next);
}
else if (f.Previous != null && (b = OppositeNode(f.Previous.Value, v)) != -1) {
Debug.Assert((a == newEdge.Source() || a == newEdge.Target()));
Debug.Assert((b == newEdge.Source() || b == newEdge.Target()));
f.Value = newEdge;
f.List.Remove(f.Previous);
}
else
throw new NotSupportedException();
}
/// <summary>
/// extract the next edge on a given path after node v
/// </summary>
MetroEdge FindNextEdgeOnPath(int v, PathOnEdge pathOnEdge) {
if (pathOnEdge.node.Next != null) {
int o = OppositeNode(pathOnEdge.node.Next.Value, v);
if (o != -1) return pathOnEdge.node.Next.Value;
}
if (pathOnEdge.node.Previous != null) {
int o = OppositeNode(pathOnEdge.node.Previous.Value, v);
if (o != -1) return pathOnEdge.node.Previous.Value;
}
throw new NotSupportedException();
}
void InitPathData() {
paths = new Dictionary<int, LinkedList<MetroEdge>>();
e2p = new Dictionary<MetroEdge, PathList>();
for (int mi = 0; mi < Metrolines.Count; mi++) {
int[] Metroline = Metrolines[mi];
paths.Add(mi, new LinkedList<MetroEdge>());
for (int i = 0; i + 1 < Metroline.Length; i++) {
MetroEdge me = MetroEdge.CreateFromTwoNodes(Metroline[i], Metroline[i + 1]);
if (!e2p.ContainsKey(me)) {
PathList pl = new PathList();
pl.edge = me;
pl.paths = new HashSet<PathOnEdge>();
e2p.Add(me, pl);
}
PathOnEdge pathOnEdge = new PathOnEdge();
pathOnEdge.index = mi;
pathOnEdge.node = paths[mi].AddLast(me);
e2p[me].paths.Add(pathOnEdge);
}
}
}
