/// <summary>
/// Returns a path
/// </summary>
/// <returns>a path or null if the target is not reachable from the source</returns>
internal IEnumerable <VisibilityVertex> GetPath()
{
var pq = new GenericBinaryHeapPriorityQueue <VisibilityVertex>();
foreach (var v in sources)
{
v.Distance = 0;
pq.Enqueue(v, 0);
}
while (!pq.IsEmpty())
{
_current = pq.Dequeue();
if (targets.Contains(_current))
{
break;
}
foreach (var e in _current.OutEdges.Where(PassableOutEdge))
{
ProcessNeighbor(pq, e, e.Target);
}
foreach (var e in _current.InEdges.Where(PassableInEdge))
{
ProcessNeighbor(pq, e, e.Source);
}
}
return(_visGraph.PreviosVertex(_current) == null ? null : CalculatePath());
}
/// <summary>
/// Grow hubs
/// </summary>
bool GrowHubs(bool useHalfEdgesAsIdealR)
{
var queue = new GenericBinaryHeapPriorityQueue <Station>();
foreach (var v in metroGraphData.VirtualNodes())
{
queue.Enqueue(v, -CalculatePotential(v, useHalfEdgesAsIdealR));
}
bool progress = false;
//choose a hub with the greatest potential
while (!queue.IsEmpty())
{
double hu;
Station v = queue.Dequeue(out hu);
if (hu >= 0)
{
break;
}
//grow the hub
if (TryGrowHub(v, useHalfEdgesAsIdealR))
{
queue.Enqueue(v, -CalculatePotential(v, useHalfEdgesAsIdealR));
progress = true;
}
}
return(progress);
}
/// <summary>
/// Returns a path
/// </summary>
/// <returns>a path or null if the target is not reachable from the source</returns>
internal IEnumerable<VisibilityVertex> GetPath(bool shrinkEdgeLength) {
var pq = new GenericBinaryHeapPriorityQueue<VisibilityVertex>();
_source.Distance = 0;
_target.Distance = double.PositiveInfinity;
pq.Enqueue(_source, H(_source));
while (!pq.IsEmpty()) {
double hu;
var u = pq.Dequeue(out hu);
if (hu >= _target.Distance)
break;
foreach (var e in u.OutEdges) {
if (PassableOutEdge(e)) {
var v = e.Target;
ProcessNeighbor(pq, u, e, v);
}
}
foreach (var e in u.InEdges) {
if (PassableInEdge(e)) {
var v = e.Source;
ProcessNeighbor(pq, u, e, v);
}
}
}
return _visGraph.PreviosVertex(_target) == null
? null
: CalculatePath(shrinkEdgeLength);
}
/// <summary>
/// Returns a path
/// </summary>
/// <returns>a path or null if the target is not reachable from the source</returns>
internal IEnumerable <VisibilityVertex> GetPath(bool shrinkEdgeLength)
{
var pq = new GenericBinaryHeapPriorityQueue <VisibilityVertex>();
_source.Distance = 0;
_target.Distance = double.PositiveInfinity;
pq.Enqueue(_source, H(_source));
while (!pq.IsEmpty())
{
double hu;
var u = pq.Dequeue(out hu);
if (hu >= _target.Distance)
{
break;
}
foreach (var e in u.OutEdges)
{
if (PassableOutEdge(e))
{
var v = e.Target;
if (u != _source && u.isReal)
{
ProcessNeighbor(pq, u, e, v, 1000);
}
else
{
ProcessNeighbor(pq, u, e, v);
}
}
}
foreach (var e in u.InEdges)
{
if (PassableInEdge(e))
{
var v = e.Source;
ProcessNeighbor(pq, u, e, v);
}
}
}
return(_visGraph.PreviosVertex(_target) == null
? null
: CalculatePath(shrinkEdgeLength));
}
/// <summary>
/// Returns a path
/// </summary>
/// <returns>a path or null if the target is not reachable from the source</returns>
internal IEnumerable<VisibilityVertex> GetPath() {
var pq = new GenericBinaryHeapPriorityQueue<VisibilityVertex>();
source.Distance = 0;
pq.Enqueue(source, 0);
while (!pq.IsEmpty()) {
current = pq.Dequeue();
if (targets.Contains(current))
break;
foreach (var e in current.OutEdges.Where(PassableOutEdge))
ProcessNeighbor(pq, e, e.Target);
foreach (var e in current.InEdges.Where(PassableInEdge))
ProcessNeighbor(pq, e, e.Source);
}
return _visGraph.PreviosVertex(current) == null ? null : CalculatePath();
}
/// <summary>
/// Grow hubs
/// </summary>
bool GrowHubs(bool useHalfEdgesAsIdealR) {
var queue = new GenericBinaryHeapPriorityQueue<Station>();
foreach (var v in metroGraphData.VirtualNodes()) {
queue.Enqueue(v, -CalculatePotential(v, useHalfEdgesAsIdealR));
}
bool progress = false;
//choose a hub with the greatest potential
while (!queue.IsEmpty()) {
double hu;
Station v = queue.Dequeue(out hu);
if (hu >= 0)
break;
//grow the hub
if (TryGrowHub(v, useHalfEdgesAsIdealR)) {
queue.Enqueue(v, -CalculatePotential(v, useHalfEdgesAsIdealR));
progress = true;
}
}
return progress;
}
