public ProblemAction[] Actions(ProblemState <T> state)
{
var(rowNumber, columnNumber) = state.FindEmpty();
var actions = new List <ProblemAction>();
if (columnNumber > 0)
{
actions.Add(ProblemAction.Left);
}
if (columnNumber < state.GetLength(0) - 1)
{
actions.Add(ProblemAction.Right);
}
if (rowNumber > 0)
{
actions.Add(ProblemAction.Up);
}
if (rowNumber < state.GetLength(1) - 1)
{
actions.Add(ProblemAction.Down);
}
return(actions.ToArray());
}
protected override ProblemState <T> FormulateGoal(ProblemState <T> state)
{
var values = state.ToValues();
Array.Sort(values);
return(values.ToProblemState(state.GetLength(0), state.GetLength(1)));
}
public static bool StateEquals <T>(this ProblemState <T> left, ProblemState <T> right)
{
for (int i = 0; i < left.GetLength(0); i++)
{
for (int j = 0; j < left.GetLength(1); j++)
{
if (!Equals(left[i, j], right[i, j]))
{
return(false);
}
}
}
return(true);
}
public static ProblemState <T> ToProblemState <T>(this PuzzleBoard <T> perceptedObj)
{
var perceptedState = new ProblemState <T>(
perceptedObj.Pieces.GetLength(0), perceptedObj.Pieces.GetLength(1));
for (int i = 0; i < perceptedState.GetLength(0); i++)
{
for (int j = 0; j < perceptedState.GetLength(1); j++)
{
perceptedState[i, j] = perceptedObj.Pieces[i, j].Value;
}
}
return(perceptedState);
}
public static T[] ToValues <T>(this ProblemState <T> state)
{
int rows = state.GetLength(0);
var values = new T[rows * state.GetLength(1)];
for (int i = 0; i < state.GetLength(0); i++)
{
for (int j = 0; j < state.GetLength(1); j++)
{
values[rows * i + j] = state[i, j];
}
}
return(values);
}
public static PuzzleBoard <T> ToPuzzleBoard <T>(this ProblemState <T> problemState)
{
var state = new PuzzleBoard <T>(new PuzzlePiece <T> [problemState.GetLength(0), problemState.GetLength(1)]);
for (int i = 0; i < problemState.GetLength(0); i++)
{
for (int j = 0; j < problemState.GetLength(0); j++)
{
state.Pieces[i, j] = new PuzzlePiece <T> {
Value = problemState[i, j]
};
}
}
return(state);
}
public static double StraightLineDistance(
ProblemState <int> stateSrc, ProblemState <int> stateDest)
{
double totalDist = 0;
for (int i = 0; i < stateDest.GetLength(0); i++)
{
for (int j = 0; j < stateDest.GetLength(1); j++)
{
totalDist += StraightLineDistance(
stateSrc.FindValueIndex(stateDest[i, j]),
(i, j));
}
}
return(totalDist);
}
public ProblemState <T> Result(ProblemState <T> state, ProblemAction action)
{
var(rowNumber, columnNumber) = state.FindEmpty();
var transitionState = new ProblemState <T>(state.GetLength(0), state.GetLength(1));
ProblemState <T> .Copy(state, transitionState, state.Length);
int row = rowNumber, col = columnNumber;
if (action == ProblemAction.Up)
{
row = rowNumber - 1;
}
if (action == ProblemAction.Down)
{
row = rowNumber + 1;
}
if (action == ProblemAction.Left)
{
col = columnNumber - 1;
}
if (action == ProblemAction.Right)
{
col = columnNumber + 1;
}
transitionState[row, col] = state[rowNumber, columnNumber];
transitionState[rowNumber, columnNumber] = state[row, col];
return(transitionState);
}