private void OnFinalState(State state)
{
if (state != null)
{
// We have a solution for this puzzle
// Backtrac to the root of the path in the tree
Stack <State> path = new Stack <State>();
while (state != null)
{
path.Push(state);
state = state.GetParent();
}
while (path.Count > 0)
{
// Move one by one down the path
OnStateChanged(path.Pop().GetState(), path.Count == 0);
}
}
else
{
// No solution
OnStateChanged(null, true);
}
}
private void PuzzleSolved(State state, int states)
{
int steps = -1;
while (state != null)
{
state = state.GetParent();
steps++;
}
if (OnPuzzleSolved != null)
{
OnPuzzleSolved(steps, (int)mStopWatch.ElapsedMilliseconds, states);
}
}
private void Start(int[] nodes, Heuristic heuristic, CsvWriter csv, int problemType)
{
int openStateIndex;
int stateCount = -1;
State currentState = null;
List <State> nextStates = new List <State>();
HashSet <String> openStates = new HashSet <string>();
MinPriorityQueue <State> openStateQueue = new MinPriorityQueue <State>(nodes.Length * 3);
Dictionary <String, State> closedQueue = new Dictionary <string, State>(nodes.Length * 3);
var endProcess = false;
var levelCountGenerated = new int[problemType + 1];
var levelCountExpanded = new int[problemType + 1];
var levelCountEvaluated = new int[problemType + 1];
State state = new State(null, nodes, heuristic);
openStateQueue.Enqueue(state);
openStates.Add(state.GetStateCode());
StartMeasure();
while (!openStateQueue.IsEmpty())
{
if (endProcess)
{
break;
}
currentState = openStateQueue.Dequeue();
openStates.Remove(currentState.GetStateCode());
stateCount++;
if (currentState.GetParent() == null)
{
currentState.level = 0;
}
else
{
levelCountExpanded[currentState.GetParent().level]++;
}
// Look into next state
currentState.GetNextStates(ref nextStates);
if (nextStates.Count > 0)
{
State closedState;
State openState;
State nextState;
for (int i = 0; i < nextStates.Count; i++)
{
closedState = null;
openState = null;
nextState = nextStates[i];
if (currentState.level > levelCountGenerated.Length - 1)
{
Array.Resize(ref levelCountGenerated, currentState.level + 1);
Array.Resize(ref levelCountExpanded, currentState.level + 1);
Array.Resize(ref levelCountEvaluated, currentState.level + 1);
}
nextState.level = currentState.level + 1;
levelCountGenerated[currentState.level]++;
if (nextState.IsFinalState())
{
EndMeasure(stateCount);
endProcess = true;
break;
}
if (openStates.Contains(nextState.GetStateCode()))
{
// We already have same state in the open queue.
openState = openStateQueue.Find(nextState, out openStateIndex);
if (openState.IsCostlierThan(nextState))
{
// We have found a better way to reach at this state. Discard the costlier one
openStateQueue.Remove(openStateIndex);
openStateQueue.Enqueue(nextState);
}
}
else
{
// Check if state is in closed queue
String stateCode = nextState.GetStateCode();
if (closedQueue.TryGetValue(stateCode, out closedState))
{
// We have found a better way to reach at this state. Discard the costlier one
if (closedState.IsCostlierThan(nextState))
{
closedQueue.Remove(stateCode);
closedQueue[stateCode] = nextState;
}
}
}
// Either this is a new state, or better than previous one.
if (openState == null && closedState == null)
{
levelCountEvaluated[currentState.level]++;
openStateQueue.Enqueue(nextState);
openStates.Add(nextState.GetStateCode());
}
}
closedQueue[currentState.GetStateCode()] = currentState;
}
}
var steps = PuzzleSolved(currentState, stateCount);
var goalState = "1*2*3*4*5*6*7*8*-1";
var levelCountGeneratedString = levelCountGenerated.Aggregate("", (current, item) => current + (item + "|"));
var levelCountEvaluatedString = levelCountEvaluated.Aggregate("", (current, item) => current + (item + "|"));
var levelCountExpandedString = levelCountExpanded.Aggregate("", (current, item) => current + (item + "|"));
var totalGenerated = levelCountGenerated.Sum();
var totalEvaluated = levelCountEvaluated.Sum();
var totalExpanded = levelCountExpanded.Sum();
var record = new { Time = mStopWatch.ElapsedTicks / 10000.0, State = "\"" + state.GetStateCode() + "\"", GoalState = goalState, Step = steps };
csv.WriteRecord(record);
csv.WriteField(levelCountGeneratedString);
csv.WriteField(levelCountEvaluatedString);
csv.WriteField(levelCountExpandedString);
csv.WriteField(totalGenerated);
csv.WriteField(totalEvaluated);
csv.WriteField(totalExpanded);
csv.NextRecord();
//OnFinalState(currentState);
}