/// <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);
}
public ShortestPartRouterForLg(Node source, Node target, Func <Node, LgNodeInfo> geomNodeToLgNode)
{
this.source = source;
this.target = target;
this.geomNodeToLgNode = geomNodeToLgNode;
queue.Enqueue(source, 0);
pathDirection = target.Center - source.Center;
costToTarget = double.PositiveInfinity;
EdgeIsInterestingFunc = MonotonicityFunc;
}
internal void Run()
{
source.Cost = 0;
source.Processed = true;
q.Enqueue(source, 0);
while (q.Count > 0)
{
double cost;
var n = q.Dequeue(out cost);
ProcessNode(n);
}
}
void InitEventQueue()
{
Queue = new GenericBinaryHeapPriorityQueue <LinkedPoint>();
foreach (var vertPoint in VerticalPoints)
{
Queue.Enqueue(vertPoint, Low(vertPoint));
}
//a horizontal point will appear in the queue after a vertical point
// with the same coordinate low coorinate
foreach (var horizPoint in HorizontalPoints)
{
Queue.Enqueue(horizPoint, horizPoint.Point.Y);
}
}
/// <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);
}
void ProcessNeighbor(GenericBinaryHeapPriorityQueue <VisibilityVertex> pq, VisibilityEdge l,
VisibilityVertex v)
{
var len = l.Length;
var c = _current.Distance + len;
if (c >= upperBound)
{
return;
}
if (targets.Contains(v))
{
upperBound = c;
closestTarget = v;
}
if (v != sources && _visGraph.PreviosVertex(v) == null)
{
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
pq.Enqueue(v, c);
}
else if (c < v.Distance)
{
//This condition should never hold for the dequeued nodes.
//However because of a very rare case of an epsilon error it might!
//In this case DecreasePriority will fail to find "v" and the algorithm will continue working.
//Since v is not in the queue changing its .Distance will not mess up the queue.
//Changing v.Prev is fine since we come up with a path with an insignificantly
//smaller distance.
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
pq.DecreasePriority(v, c);
}
}
void ProcessNeighbor(GenericBinaryHeapPriorityQueue <VisibilityVertex> pq, VisibilityVertex u, VisibilityEdge l, VisibilityVertex v)
{
var len = l.Length;
var c = u.Distance + len;
if (v != source && _visGraph.PreviosVertex(v) == null)
{
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
if (v != target)
{
pq.Enqueue(v, H(v));
}
}
else if (c < v.Distance) //This condition should never hold for the dequeued nodes.
//However because of a very rare case of an epsilon error it might!
//In this case DecreasePriority will fail to find "v" and the algorithm will continue working.
//Since v is not in the queue changing its .Distance will not influence other nodes.
//Changing v.Prev is fine since we come up with the path with an insignificantly
//smaller distance.
{
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
if (v != target)
{
pq.DecreasePriority(v, H(v));
}
}
}
/// <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());
}
void Cleanup() {
costToTarget = double.PositiveInfinity;
bestEdgeIntoTarget = null;
prev.Clear();
queue = new GenericBinaryHeapPriorityQueue<Node>();
queue.Enqueue(source, 0);
}
void ProcessNeighbor(GenericBinaryHeapPriorityQueue<VisibilityVertex> pq, VisibilityEdge l,
VisibilityVertex v) {
var len = l.Length;
var c = current.Distance + len;
if (c >= upperBound)
return;
if (targets.Contains(v)) {
upperBound = c;
closestTarget = v;
}
if (v != source && _visGraph.PreviosVertex(v) == null) {
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
pq.Enqueue(v, c);
} else if (c < v.Distance) {
//This condition should never hold for the dequeued nodes.
//However because of a very rare case of an epsilon error it might!
//In this case DecreasePriority will fail to find "v" and the algorithm will continue working.
//Since v is not in the queue changing its .Distance will not mess up the queue.
//Changing v.Prev is fine since we come up with a path with an insignificantly
//smaller distance.
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
pq.DecreasePriority(v, c);
}
}
void Cleanup()
{
costToTarget = double.PositiveInfinity;
bestEdgeIntoTarget = null;
prev.Clear();
queue = new GenericBinaryHeapPriorityQueue <Node>();
queue.Enqueue(source, 0);
}
/// <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;
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();
}
void ProcessNeighbor(GenericBinaryHeapPriorityQueue <VisibilityVertex> pq, VisibilityVertex u, VisibilityEdge l, VisibilityVertex v, int penalty)
{
var len = l.Length + penalty;
var c = u.Distance + len;
/*
* if (_visGraph.visVertexToId[l.Source] < _g.N || _visGraph.visVertexToId[l.Target] < _g.N)
* {
* if (!(l.Source == _source || l.Target == _source || l.Source == _target || l.Target == _target))
* {
* c = 500;
* }
* }
*/
// (v != _source && _visGraph.PreviosVertex(v) == null)
if (v != _source && _visGraph.PreviosVertex(v) == null)
{
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
if (v != _target)
{
pq.Enqueue(v, H(v));
}
}
else if (v != _source && c < v.Distance)
{ //This condition should never hold for the dequeued nodes.
//However because of a very rare case of an epsilon error it might!
//In this case DecreasePriority will fail to find "v" and the algorithm will continue working.
//Since v is not in the queue changing its .Distance will not influence other nodes.
//Changing v.Prev is fine since we come up with the path with an insignificantly
//smaller distance.
var prevV = _visGraph.PreviosVertex(v);
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
if (v != _target)
{
pq.DecreasePriority(v, H(v));
}
}
}
void Enqueue(SdVertex simpleSdVertex)
{
Queue.Enqueue(simpleSdVertex, H(simpleSdVertex));
}
void ProcessNeighbor(GenericBinaryHeapPriorityQueue<VisibilityVertex> pq, VisibilityVertex u, VisibilityEdge l, VisibilityVertex v) {
var len = l.Length;
var c = u.Distance + len;
// (v != _source && _visGraph.PreviosVertex(v) == null)
if (v != _source && _visGraph.PreviosVertex(v) == null) {
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
if (v != _target) {
pq.Enqueue(v, H(v));
}
} else if (v != _source && c < v.Distance) { //This condition should never hold for the dequeued nodes.
//However because of a very rare case of an epsilon error it might!
//In this case DecreasePriority will fail to find "v" and the algorithm will continue working.
//Since v is not in the queue changing its .Distance will not influence other nodes.
//Changing v.Prev is fine since we come up with the path with an insignificantly
//smaller distance.
var prevV = _visGraph.PreviosVertex(v);
v.Distance = c;
_visGraph.SetPreviousEdge(v, l);
if (v != _target)
pq.DecreasePriority(v, H(v));
}
}
void InitEventQueue() {
Queue = new GenericBinaryHeapPriorityQueue<LinkedPoint>();
foreach (var vertPoint in VerticalPoints)
Queue.Enqueue(vertPoint, Low(vertPoint));
//a horizontal point will appear in the queue after a vertical point
// with the same coordinate low coorinate
foreach (var horizPoint in HorizontalPoints)
Queue.Enqueue(horizPoint, horizPoint.Point.Y);
}
