public IGameMove[] GetPossibleMoves(IGameState gameState, GamePlayer player)
{
if (null == gameState)
{
throw new ArgumentNullException("gameState");
}
FourInARowState state = (FourInARowState)gameState;
List <IGameMove> moves = new List <IGameMove>();
for (Int32 q = 0, mq = FourInARowState.ColumnCount; q < mq; q++)
{
if (state.Get(q, FourInARowState.RowCount - 1) == FourInARowFieldState.Empty)
{
moves.Add(new FourInARowMove
{
Column = q,
State = player == GamePlayer.PlayerMax ? FourInARowFieldState.Cross : FourInARowFieldState.Circle
});
}
}
return(moves.ToArray());
}
private static PartialResults CheckDiagonals(FourInARowState state)
{
PartialResults summary = new PartialResults();
//// from left bottom to right top
for (Int32 startY = 0, mStartY = FourInARowState.RowCount - WinningCount + 1; startY < mStartY; startY++)
{
FieldContext context = new FieldContext();
for (Int32 x = 0, y = startY, my = FourInARowState.RowCount, mx = FourInARowState.ColumnCount; y < my && x < mx /* && y < state.LastEmptyRow */; x++, y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
for (Int32 startX = 1, mStartX = FourInARowState.ColumnCount - WinningCount + 1; startX < mStartX; startX++)
{
FieldContext context = new FieldContext();
for (Int32 x = startX, y = 0, my = FourInARowState.RowCount, mx = FourInARowState.ColumnCount; y < my && x < mx /* && y < state.LastEmptyRow */; x++, y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
//// from right bottom to left top
for (Int32 startY = 0, mStartY = FourInARowState.RowCount - WinningCount + 1; startY < mStartY; startY++)
{
FieldContext context = new FieldContext();
for (Int32 x = FourInARowState.ColumnCount - 1, y = startY, my = FourInARowState.RowCount; y < my && x >= 0 /* && y < state.LastEmptyRow */; x--, y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
for (Int32 sStartX = FourInARowState.ColumnCount - 2, mStartX = WinningCount - 1; sStartX >= mStartX; sStartX--)
{
FieldContext context = new FieldContext();
for (Int32 x = sStartX, y = 0, my = FourInARowState.RowCount; y < my && x >= 0 /* && y < state.LastEmptyRow */; x--, y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
return(summary);
}
private static PartialResults CheckColumns(FourInARowState state)
{
PartialResults summary = new PartialResults();
for (Int32 x = 0, mx = FourInARowState.ColumnCount; x < mx; x++)
{
FieldContext context = new FieldContext();
for (Int32 y = 0, my = FourInARowState.RowCount; y < my /* && y < state.LastEmptyRow */; y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
return(summary);
}
internal FourInARowState(FourInARowState source)
{
if (null == source)
{
throw new ArgumentNullException("source");
}
_nextMoveIndexes = (Int32[])source._nextMoveIndexes.Clone();
_fields = new FourInARowFieldState[ColumnCount][];
for (Int32 q = 0; q < _fields.Length; q++)
{
_fields[q] = (FourInARowFieldState[])source._fields[q].Clone();
}
_stateDesc = (Char[])source._stateDesc.Clone();
_lastEmptyRow = source._lastEmptyRow;
}
public Int32 Evaluate(IGameState gameState, GamePlayer player)
{
FourInARowState state = (FourInARowState)gameState;
PartialResults summary = new PartialResults();
PartialResults result = CheckColumns(state);
summary.Add(result);
result = CheckRows(state);
summary.Add(result);
result = CheckDiagonals(state);
summary.Add(result);
return(CalculateScore(summary, player));
}
public IGameState MakeMove(IGameMove gameMove, IGameState gameState)
{
if (null == gameState)
{
throw new ArgumentNullException("gameState");
}
if (null == gameMove)
{
throw new ArgumentNullException("gameMove");
}
FourInARowMove move = (FourInARowMove)gameMove;
FourInARowState state = (FourInARowState)gameState;
if (move.Column < 0 || move.Column >= FourInARowState.ColumnCount)
{
throw new ArgumentOutOfRangeException("column " + move.Column);
}
Int32 nextField = state.Indexes[move.Column];
if (nextField < FourInARowState.RowCount &&
state.Get(move.Column, nextField) == FourInARowFieldState.Empty)
{
FourInARowState newState = new FourInARowState(state);
newState.Set(move.Column, nextField, move.State);
return(newState);
}
else
{
throw new InvalidOperationException(String.Format("Move not allowed {0} {1}", move.Column, nextField));
}
}
private static void ProcessField(FourInARowState state, Int32 x, Int32 y, FieldContext context)
{
FourInARowFieldState field = state.Get(x, y);
context.LastFourItems.Add(field);
if (field == FourInARowFieldState.Empty)
{
context.EmptyInRow++;
}
if (field == FourInARowFieldState.Circle)
{
context.CirclesInRow++;
}
if (field == FourInARowFieldState.Cross)
{
context.CrossesInRow++;
}
if (context.LastFourItems.Count >= 4)
{
if (context.LastFourItems.Count > 4)
{
FourInARowFieldState first = context.LastFourItems[0];
context.LastFourItems.RemoveAt(0);
if (first == FourInARowFieldState.Empty)
{
context.EmptyInRow--;
}
if (first == FourInARowFieldState.Circle)
{
context.CirclesInRow--;
}
if (first == FourInARowFieldState.Cross)
{
context.CrossesInRow--;
}
}
if (context.CirclesInRow == 0)
{
if (context.CrossesInRow == 4)
{
context.PartialResults.FourCrossesInRow++;
}
else if (context.CrossesInRow == 2 && context.EmptyInRow == 2)
{
context.PartialResults.TwoCrossesInRow++;
}
else if (context.CrossesInRow == 3 && context.EmptyInRow == 1)
{
context.PartialResults.ThreeCrossesInRow++;
}
else if (context.CrossesInRow == 1 && context.EmptyInRow == 3)
{
context.PartialResults.OneCrossInRow++;
}
}
if (context.CrossesInRow == 0)
{
if (context.CirclesInRow == 4)
{
context.PartialResults.FourCirclesInRow++;
}
else if (context.CirclesInRow == 2 && context.EmptyInRow == 2)
{
context.PartialResults.TwoCirclesInRow++;
}
else if (context.CirclesInRow == 3 && context.EmptyInRow == 1)
{
context.PartialResults.ThreeCirclesInRow++;
}
else if (context.CirclesInRow == 1 && context.EmptyInRow == 3)
{
context.PartialResults.OneCircleInRow++;
}
}
}
}
