public override Solution Solve(ISearchable searchDomain)
{
StartMeasureTime();
ClearOpenClosedLists();
AState startingState = searchDomain.GetStartState();
AddToOpenList(startingState); // add initial state to openList
while (!IsEmptyOpenList()) // as long openList isnt empty
{
AState state = PopOpenList(); // get a state from the queue
if (state.State.Equals(searchDomain.GetGoalState().State)) // check if it is a goalState
{
StopMeasureTime();
getBackTrace(state); // get the traceBack of the solution
Solution.RevereseSolution();
return(Solution);
}
SUCCESORS = searchDomain.GetAllSuccessors(state); // find all the neighbors of the state
AddToClosedList(state);
foreach (AState astate in SUCCESORS)
{
if (!IsStateInOpenList(astate) && !IsStateInClosedList(astate)) // if it doesnt exist in the OpenList and CloseList
{
astate.ParentState = state; // update his parent
AddToOpenList(astate); // add it to openList
}
}
}
return(null);// if there isnt solution
}
/// <summary>
/// get all the Succesors for the current state
/// </summary>
/// <param name="state"></param>
/// <returns>list of Succesors</returns>
public List <AState> GetAllSuccessors(AState state)
{
List <AState> successors = new List <AState>();
MazeState m = state as MazeState;
Position down = new Position(m.Position.X + 1, m.Position.Y, m.Position.Z); // create down position
checkDown(down, successors, m, state); // check for the down position
Position up = new Position(m.Position.X - 1, m.Position.Y, m.Position.Z); // create up position
checkUp(up, successors, m, state); // check for the up position
Position right = new Position(m.Position.X, m.Position.Y + 1, m.Position.Z); // create right position
checkRight(right, successors, m, state); // check for the right position
Position left = new Position(m.Position.X, m.Position.Y - 1, m.Position.Z); // create left position
checkLeft(left, successors, m, state); // check for the up position
Position UpinZ = new Position(m.Position.X, m.Position.Y, m.Position.Z + 1);
if (checkIfInLimits(UpinZ) == true && checkIfThereIsAWall(UpinZ) == false) // up in layers in maze
{
AState n_Astate = new MazeState(state, UpinZ); // add to succersos if it in limits and if not wall
successors.Add(n_Astate);
}
Position DowninZ = new Position(m.Position.X, m.Position.Y, m.Position.Z - 1);
if (checkIfInLimits(DowninZ) == true && checkIfThereIsAWall(DowninZ) == false) // down in layers in maze
{
AState n_Astate = new MazeState(state, DowninZ); // add to succersos if it in limits and if not wall
successors.Add(n_Astate);
}
return(successors);
}
public override Solution Solve(ISearchable searchDomain)
{
StartMeasureTime();// start measure the time
ClearOpenClosedLists();
AState stratingState = searchDomain.GetStartState();
addToStack(stratingState); // add the initial state to stack
while (!IfStackEmpty())
{
AState state = popStack(); // pop from the stack
if (state.State.Equals(searchDomain.GetGoalState().State)) // check if it is a goalState
{
StopMeasureTime(); // stop measure the time
getBackTrace(state); // get the traceBack of the solution
Solution.RevereseSolution();
return(Solution);
}
if (!isDiscovered(state)) // if state is not discovered
{
m_discovered.Add(state); // add it to DiscoverdLIst
SUCCESORS = searchDomain.GetAllSuccessors(state); // foreach state in succersors, add it to stack
foreach (AState Astate in SUCCESORS)
{
addToStack(Astate);
}
}
}
return(null);
}
/// <summary>
/// get the way in the maze to solve it
/// </summary>
/// <param name="state">state in the maze</param>
public void getBackTrace(AState state)
{
Solution.AddState(state);
while (state.ParentState != null)
{
Solution.AddState(state.ParentState); //add to SolutionList
state = state.ParentState; // update the fatherState
}
}
/// <summary>
/// check if the state is in the openList
/// </summary>
/// <param name="state">state in the maze</param>
/// <returns>return true if the state exist in the list</returns>
protected bool IsStateInOpenList(AState state)
{
foreach (AState s in m_openList)
{
if (state.State.Equals(s.State))
{
return(true);
}
}
return(false);
}
public bool isDiscovered(AState state) // check if the state was discovered
{
foreach (AState s in m_discovered) // for each state in discovered list
{
if (s.State.Equals(state.State)) // check if equals
{
return(true);
}
}
return(false);
}
/// <summary>
/// check if the Mase States are equals
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public override bool Equals(AState obj)
{
//if ((obj.State == State) && (obj.M_G == M_G) && obj.ParentState.State == ParentState.State && obj.ParentState.M_G == ParentState.M_G)
// return true;
//return false;
if (obj.State == State)
{
return(true);
}
return(false);
}
/// <summary>
/// compare the MazeState
/// </summary>
/// <param name="state"></param>
/// <returns></returns>
public override int CompareTo(AState state)
{
if (M_G > state.M_G)
{
return(1);
}
else
{
if (M_G < state.M_G)
{
return(-1);
}
return(0);
}
}
/// <summary>
/// check if there is a way in down position
/// </summary>
/// <param name="down"> position in maze</param>
/// <param name="successors">list of succesors</param>
/// <param name="m">maze state</param>
/// <param name="state"> state</param>
public void checkDown(Position down, List <AState> successors, MazeState m, AState state)
{
if (checkIfInLimits(down) == true) // check if in limits of the maze
{
if (checkIfThereIsAWall(down) == false) // check if it is a wall
{
Position downCell = new Position(m.Position.X + 2, m.Position.Y, m.Position.Z); // cell that it is part of the options in the maze
if (checkIfInLimits(downCell) == true)
{
AState n_Astate = new MazeState(state, downCell); // add to succersos if it in limits and if not wall
successors.Add(n_Astate);
}
}
}
}
/// <summary>
/// add state to ClosedList
/// </summary>
/// <param name="state">state in the maze</param>
protected void AddToClosedList(AState state)
{
m_closedList.Enqueue(state);
}
/// <summary>
/// add State to OpenList
/// </summary>
/// <param name="state">state in the maze</param>
protected void AddToOpenList(AState state)
{
m_openList.Enqueue(state);
m_countGeneratedNodes++;
}
/// <summary>
/// add state to stack
/// </summary>
/// <param name="state">state in the maze</param>
public void addToStack(AState state)
{
m_stack.Push(state);
m_countGeneratedNodes++;
}
/// <summary>
/// inisialize the MazeSate
/// </summary>
/// <param name="Parent_state">get the ParentState</param>
/// <param name="position">get the Position</param>
public MazeState(AState Parent_state, Position position) : base(Parent_state)
{
m_position = position;
m_state = position.ToString();
}
/// <summary>
/// add State to Solution
/// </summary>
/// <param name="state">get the state to add</param>
public void AddState(AState state)
{
m_solutionPath.Add(state);
}