/// <summary>Creates a populated <see cref="Collection{T}"/> of <see cref="Landmark"/>
/// instances.</summary>
/// <param name="board">The board on which the collection of landmarks is to be instantiated.</param>
/// <param name="landmarkCoords">Board coordinates of the desired landmarks</param>
public static ILandmarkCollection New(
INavigableBoard board,
IFastList <HexCoords> landmarkCoords
)
{
int degreeOfParallelism = Math.Max(1, Environment.ProcessorCount - 1);
var query = from coords in landmarkCoords.AsParallel()
.WithDegreeOfParallelism(degreeOfParallelism)
.WithMergeOptions(ParallelMergeOptions.NotBuffered)
#if UseSortedDictionary
select Landmark.DictionaryPriorityQueueLandmark(coords, board);
#else
select Landmark.HotPriorityQueueLandmark(coords, board);
#endif
return(Extensions.InitializeDisposable(() => new LandmarkCollection(query)));
}
BidirectionalPathfinder(IHex start, IHex goal,
LandmarkCollection landmarks, HashSet <HexCoords> closed, Func <int> getBestSoFar
)
{
_start = start;
_goal = goal;
_getBestSoFar = getBestSoFar;
_vectorGoal = goal.Coords.Canon - start.Coords.Canon;
_open = new Dictionary <HexCoords, DirectedPath>();
_closed = closed;
_queue = new HotPriorityQueue <DirectedPath>(16);
_landmark = landmarks
.OrderByDescending(l => l.HexDistance(goal.Coords) - l.HexDistance(start.Coords))
.FirstOrDefault();
_heuristic = c => _landmark.HexDistance(c) - _landmark.HexDistance(start.Coords);
var path = new DirectedPath(goal);
_open.Add(goal.Coords, path);
_queue.Enqueue(0, path);
}