public Tuple <List <object>, int> GetLongestPath(ISearchNode startState, ISearchNode goalState = null, bool verbose = false)
{
if (verbose)
{
Console.Clear();
}
Stopwatch searchWatch = new Stopwatch();
searchWatch.Start();
openQueue = new SimplePriorityQueue <ISearchNode>();
closedSet = new HashSet <ISearchNode>();
openQueue.Enqueue(startState, 0);
long step = 0;
ISearchNode current;
HashSet <ExpandAction> expandActions;
ISearchNode newNode;
ISearchNode match;
var targetCandidates = new List <Tuple <List <object>, int> >();
while (openQueue.Count > 0)
{
step++;
current = openQueue.Dequeue();
closedSet.Add(current);
if (current.IsGoalState(goalState))
{
//todo: this can probably be optimized to work more like standard A*, but negating Cost + Heuristic wasn't enough and this is probably the next best thing. Or at least it's the next thing I came up with.
targetCandidates.Add(Tuple.Create(current.Actions, current.Cost));
continue;
}
expandActions = current.ExpandNode();
if (verbose)
{
OutputVerboseInfo(goalState, searchWatch, step, current);
}
foreach (ExpandAction expandAction in expandActions)
{
newNode = expandAction.Result;
newNode.Cost = current.Cost + expandAction.Cost;
newNode.Actions.Add(expandAction.Action);
if (closedSet.Any(x => x.Equals(newNode)))
{
continue;
}
match = openQueue.SingleOrDefault(x => x.Equals(newNode));
if (match != default(ISearchNode))
{
if (match.Cost < newNode.Cost)
{
openQueue.UpdatePriority(match, -1 * (newNode.Cost + newNode.GetHeuristic(goalState)));
}
}
else
{
openQueue.Enqueue(newNode, -1 * (newNode.Cost + newNode.GetHeuristic(goalState)));
}
}
}
return(targetCandidates.OrderByDescending(c => c.Item2).First());
}
public Tuple <List <object>, int> GetOptimalPath(SearchNode startState, SearchNode goalState = null, bool verbose = false)
{
if (verbose)
{
Console.Clear();
}
Stopwatch searchWatch = new Stopwatch();
searchWatch.Start();
openQueueNew = new SimplePriorityQueue <SearchNode>();
closedSetNew = new HashSet <SearchNode>();
openQueueNew.Enqueue(startState, 0);
long step = 0;
SearchNode current;
HashSet <ExpandActionNew> expandActions;
SearchNode newNode;
SearchNode match;
while (openQueueNew.Count > 0)
{
step++;
current = openQueueNew.Dequeue();
if (current.IsGoalState(current))
{
return(Tuple.Create(current.Actions, current.Cost));
}
closedSetNew.Add(current);
expandActions = current.ExpandNode();
if (verbose)
{
OutputVerboseInfo(goalState, searchWatch, step, current);
}
foreach (ExpandActionNew expandAction in expandActions)
{
newNode = expandAction.Result;
newNode.Cost = current.Cost + expandAction.Cost;
newNode.Actions.Add(expandAction.Action);
if (closedSetNew.Contains(newNode))
{
continue;
}
match = openQueueNew.SingleOrDefault(x => x.Equals(newNode));
if (match != null)
{
if (match.Cost > newNode.Cost)
{
openQueueNew.UpdatePriority(match, newNode.Cost + newNode.GetHeuristic(goalState));
}
}
else
{
openQueueNew.Enqueue(newNode, newNode.Cost + newNode.GetHeuristic(goalState));
}
}
}
return(Tuple.Create(new List <object>(), -1));
}
// ReSharper disable once MemberCanBePrivate.Global
public Tuple <List <object>, int> GetOptimalPath(ISearchNode startState, ISearchNode goalState = null, bool verbose = false, bool stepByStep = false)
{
if (verbose)
{
Console.Clear();
}
Stopwatch searchWatch = new Stopwatch();
searchWatch.Start();
openQueue = new SimplePriorityQueue <ISearchNode>();
closedSet = new HashSet <ISearchNode>();
openQueue.Enqueue(startState, 0);
long step = 0;
ISearchNode current;
HashSet <ExpandAction> expandActions;
ISearchNode newNode;
ISearchNode match;
while (openQueue.Count > 0)
{
step++;
current = openQueue.Dequeue();
if (current.IsGoalState(goalState))
{
return(Tuple.Create(current.Actions, current.Cost));
}
expandActions = current.ExpandNode();
closedSet.Add(current);
if (verbose)
{
OutputVerboseInfo(goalState, searchWatch, step, current);
if (stepByStep)
{
Console.ReadLine();
}
}
foreach (ExpandAction expandAction in expandActions)
{
newNode = expandAction.Result;
newNode.Cost = current.Cost + expandAction.Cost;
newNode.Actions.Add(expandAction.Action);
if (closedSet.Any(x => x.Equals(newNode)))
{
continue;
}
match = openQueue.SingleOrDefault(x => x.Equals(newNode));
if (match != default(ISearchNode))
{
if (match.Cost > newNode.Cost)
{
openQueue.UpdatePriority(match, newNode.Cost + newNode.GetHeuristic(goalState));
}
}
else
{
openQueue.Enqueue(newNode, newNode.Cost + newNode.GetHeuristic(goalState));
}
}
OnSearchNodeProcessed(new SearchEventArgs
{
ClosedSet = closedSet,
OpenQueue = openQueue,
CurrentNode = current
});
}
return(Tuple.Create(new List <object>(), -1));
}