private static bool GetPointWinner_CheckFieldState(GameStateInternal gameState, uint x, uint y, ref FieldState expectedState)
{
if (gameState.Inside(x, y))
{
FieldState fieldState = gameState.BoardFields[x, y];
if (fieldState == FieldState.Empty)
{
return(false);
}
else
{
if (expectedState == FieldState.Empty)
{
expectedState = fieldState;
return(true);
}
else if (expectedState != fieldState)
{
return(false);
}
}
}
return(true);
}
public GameState Play(FieldCoordinates action)
{
if (action == FieldCoordinates.Pass)
{
if (PreviousMove == FieldCoordinates.Pass)
{
return(new GameState(CurrentPlayer.Opposite, InternalState.Pass()));
}
else
{
return(new GameState(FieldCoordinates.Pass, CurrentPlayer.Opposite, InternalState.Pass()));
}
}
else
{
GameStateInternal nextState = InternalState.Play(action.X, action.Y, CurrentPlayer);
if (nextState == null)
{
throw new Exception();
}
else
{
return(new GameState(action, CurrentPlayer.Opposite, nextState));
}
}
}
public GameStateInternal(GameStateInternal state)
{
Ko = FieldCoordinates.Pass;
CapturedStones = state.CapturedStones;
BoardSize = state.BoardSize;
BoardFields = new FieldState[BoardSize, BoardSize];
Array.Copy(state.BoardFields, BoardFields, state.BoardFields.Length);
}
public GameStateInternal Play(uint x, uint y, Stone stone)
{
if (Inside(x, y))
{
if (BoardFields[x, y] == FieldState.Empty)
{
GameStateInternal result = new GameStateInternal(this);
uint capturedW = result.RemoveGroupIfHasOneBreath(x - 1, y, stone.Opposite.Color.State);
uint capturedE = result.RemoveGroupIfHasOneBreath(x + 1, y, stone.Opposite.Color.State);
uint capturedN = result.RemoveGroupIfHasOneBreath(x, y - 1, stone.Opposite.Color.State);
uint capturedS = result.RemoveGroupIfHasOneBreath(x, y + 1, stone.Opposite.Color.State);
uint capturedStones = capturedN + capturedS + capturedE + capturedW;
result.BoardFields[x, y] = stone.Color.State;
int breaths = result.MarkGroup(x, y, stone.Color.State);
if (breaths > 0)
{
result.ClearMarkedFields(stone.Color.State, FieldState.Empty);
result.CapturedStones.Add(stone, capturedStones);
if (capturedStones == 1 && breaths == 1)
{
if (capturedN > 0)
{
result.Ko = FieldCoordinates.Get(x, y - 1);
}
else if (capturedS > 0)
{
result.Ko = FieldCoordinates.Get(x, y + 1);
}
else if (capturedE > 0)
{
result.Ko = FieldCoordinates.Get(x + 1, y);
}
else if (capturedW > 0)
{
result.Ko = FieldCoordinates.Get(x - 1, y);
}
}
return(result);
}
}
}
return(null);
}
public static FieldState GetPointWinner(GameStateInternal gameState, uint x, uint y)
{
if (gameState.BoardFields[x, y] == FieldState.Empty)
{
FieldState expectedState = FieldState.Empty;
if (GetPointWinner_CheckFieldState(gameState, x + 1, y, ref expectedState) &&
GetPointWinner_CheckFieldState(gameState, x - 1, y, ref expectedState) &&
GetPointWinner_CheckFieldState(gameState, x, y + 1, ref expectedState) &&
GetPointWinner_CheckFieldState(gameState, x, y - 1, ref expectedState))
{
return(expectedState);
}
}
return(FieldState.Empty);
}
//Dictionary<FieldCoordinates, GameState> allowedActions;
public IEnumerable <FieldCoordinates> GetAllowedActions()
{
//if (allowedActions == null)
//{
//Dictionary<FieldCoordinates, GameState> allowedActions = new Dictionary<FieldCoordinates, GameState>();
if (IsFinal == false)
{
for (byte y = 0; y < InternalState.BoardSize; y++)
{
for (byte x = 0; x < InternalState.BoardSize; x++)
{
FieldCoordinates field = FieldCoordinates.Get(x, y);
if (field != InternalState.Ko)
{
GameStateInternal nextState = InternalState.Play(field.X, field.Y, CurrentPlayer);
if (nextState != null)
{
yield return(field);
//allowedActions.Add(field, new GameState(field, CurrentPlayer.Opposite, nextState));
}
}
}
}
yield return(FieldCoordinates.Pass);
//if (PreviousMove == FieldCoordinates.Pass)
//{
// allowedActions.Add(FieldCoordinates.Pass, new GameState(CurrentPlayer.Opposite, InternalState.Pass()));
//}
//else
//{
// allowedActions.Add(FieldCoordinates.Pass, new GameState(FieldCoordinates.Pass, CurrentPlayer.Opposite, InternalState.Pass()));
//}
}
//}
//return allowedActions.Keys;
}
public static bool IsTrueEye(GameStateInternal gameState, uint x, uint y, Stone stone)
{
int sum = 0;
if (gameState.IsOutsideOrHasState(x + 1, y - 1, stone.Color.State))
{
sum++;
}
if (gameState.IsOutsideOrHasState(x + 1, y, stone.Color.State))
{
sum++;
}
if (gameState.IsOutsideOrHasState(x + 1, y + 1, stone.Color.State))
{
sum++;
}
if (gameState.IsOutsideOrHasState(x, y + 1, stone.Color.State))
{
sum++;
}
if (gameState.IsOutsideOrHasState(x, y - 1, stone.Color.State))
{
sum++;
}
if (gameState.IsOutsideOrHasState(x - 1, y - 1, stone.Color.State))
{
sum++;
}
if (gameState.IsOutsideOrHasState(x - 1, y, stone.Color.State))
{
sum++;
}
if (gameState.IsOutsideOrHasState(x - 1, y + 1, stone.Color.State))
{
sum++;
}
return(sum >= 8);
}
// Final State
private GameState(Stone currentPlayer, GameStateInternal internalState)
{
PreviousMove = FieldCoordinates.Pass2;
CurrentPlayer = currentPlayer;
InternalState = internalState;
}
private GameState(FieldCoordinates previousMove, Stone currentPlayer, GameStateInternal internalState)
{
PreviousMove = previousMove;
CurrentPlayer = currentPlayer;
InternalState = internalState;
}
public GameState(uint boardSize)
{
PreviousMove = null;
CurrentPlayer = Stone.Black;
InternalState = new GameStateInternal(boardSize);
}