/// <summary>
/// Generates all legal <see cref="IPawn" /> moves
/// </summary>
/// <param name="boardState"></param>
public override void GenerateMoves(IBoardState boardState)
{
IChessPieceMover cpm = ModelLocator.ChessPieceMover;
MoveSet.Clear();
ChessPosition oneSpaceFromLocation = Color == ChessColor.White ? cpm.North(Location) : cpm.South(Location);
bool oneSpaceMoveIsLegal = !boardState.Contains(oneSpaceFromLocation);
if (oneSpaceMoveIsLegal)
{
MoveSet.Add(oneSpaceFromLocation);
}
else
{
return;
}
ChessPosition twoSpaceFromLocation = Color == ChessColor.White
? cpm.North(oneSpaceFromLocation)
: cpm.South(oneSpaceFromLocation);
bool twoSpaceMoveIsLegal = !boardState.Contains(twoSpaceFromLocation);
if (!HasMoved && twoSpaceMoveIsLegal)
{
MoveSet.Add(Color == ChessColor.White
? cpm.North(cpm.North(Location))
: cpm.South(cpm.South(Location)));
}
}
/// <summary>
/// Will update whether the Pawn is able to be promoted or captured via En Passant.
/// </summary>
/// <param name="position"></param>
public override void MoveTo(ChessPosition position)
{
if (!HasMoved)
{
IChessPieceMover cpm = ModelLocator.ChessPieceMover;
bool moveIsTwoForward = Color == ChessColor.White
? position == cpm.North(cpm.North(Location))
: position == cpm.South(cpm.South(Location));
IsCapturableByEnPassant = moveIsTwoForward;
}
else
{
IsCapturableByEnPassant = false;
}
base.MoveTo(position);
ChessPosition promotionRank = Color == ChessColor.White ? ChessPosition.Rank8 : ChessPosition.Rank1;
if ((position & promotionRank) == position)
{
IsPromotable = true;
}
}
private ChessPosition GenerateCaptureWest(IBoardState enemyPieces, IChessPieceMover cpm)
{
ChessPosition potentialCapture =
Color == ChessColor.White ? cpm.NorthWest(Location) : cpm.SouthWest(Location);
bool isPieceAtCaptureLocation = enemyPieces.Contains(potentialCapture);
return(isPieceAtCaptureLocation ? potentialCapture : ChessPosition.None);
}
private void GenerateSouthSouthWestMove(IBoardState boardState, IChessPieceMover cpm)
{
ChessPosition move = cpm.South(cpm.SouthWest(Location));
if (!boardState.Contains(move))
{
MoveSet.Add(move);
}
}
private void GenerateEastNorthEastMove(IBoardState boardState, IChessPieceMover cpm)
{
ChessPosition move = cpm.East(cpm.NorthEast(Location));
if (!boardState.Contains(move))
{
MoveSet.Add(move);
}
}
private void GenerateEastMoves(IBoardState boardState, IChessPieceMover cpm)
{
ChessPosition nextMove = cpm.East(Location);
if (!boardState.Contains(nextMove))
{
MoveSet.Add(nextMove);
}
}
public override void GenerateThreatened(IBoardState boardState, IBoardState owningPlayerBoardState)
{
IChessPieceMover cpm = ModelLocator.ChessPieceMover;
ThreatenSet.Clear();
ThreatenSet.Add(GenerateThreatenedEast(cpm));
ThreatenSet.Add(GenerateThreatenedWest(cpm));
}
public ChessPosition GetLocationOfPieceBeingCaptured(IPiece capturingPiece, ICapture capture)
{
IChessPieceMover cpm = ModelLocator.ChessPieceMover;
// get the position of the piece we're trying to capture via En Passant
ChessPosition locationOfPotentiallyCapturedPiece = capturingPiece.Color == ChessColor.White
? cpm.South(capture.EndingPosition)
: cpm.North(capture.EndingPosition);
return(locationOfPotentiallyCapturedPiece);
}
/// <summary>
/// Generates all legal <see cref="IPawn" /> captures
/// </summary>
/// <param name="boardState">Current board state</param>
/// <param name="owningPlayerBoardState">State of all of the moving color's pieces</param>
public override void GenerateCaptures(IBoardState boardState, IBoardState owningPlayerBoardState)
{
IChessPieceMover cpm = ModelLocator.ChessPieceMover;
CaptureSet.Clear();
IBoardState enemyPieces = CreateEnemyBoardState(boardState, owningPlayerBoardState);
CaptureSet.Add(GenerateCaptureEast(enemyPieces, cpm));
CaptureSet.Add(GenerateCaptureWest(enemyPieces, cpm));
}
/// <summary>
/// Generates all legal <see cref="Rook" /> moves
/// </summary>
/// <param name="boardState"></param>
public override void GenerateMoves(IBoardState boardState)
{
IChessPieceMover cpm = ModelLocator.ChessPieceMover;
MoveSet.Clear();
GenerateNorthMoves(boardState, cpm);
GenerateSouthMoves(boardState, cpm);
GenerateEastMoves(boardState, cpm);
GenerateWestMoves(boardState, cpm);
}
/// <summary>
/// Generates all legal <see cref="Rook" /> captures
/// </summary>
/// <param name="boardState"></param>
/// <param name="owningPlayerBoardState"></param>
public override void GenerateCaptures(IBoardState boardState, IBoardState owningPlayerBoardState)
{
IChessPieceMover cpm = ModelLocator.ChessPieceMover;
CaptureSet.Clear();
IBoardState enemyBoardState = CreateEnemyBoardState(boardState, owningPlayerBoardState);
GenerateNorthCaptures(owningPlayerBoardState, enemyBoardState, cpm);
GenerateSouthCaptures(owningPlayerBoardState, enemyBoardState, cpm);
GenerateEastCaptures(owningPlayerBoardState, enemyBoardState, cpm);
GenerateWestCaptures(owningPlayerBoardState, enemyBoardState, cpm);
}
/// <summary>
/// Executes En Passant capture. Does not check legality.
/// </summary>
/// <param name="capture"></param>
/// <returns></returns>
private int ExecuteEnPassantCapture(ICapture capture)
{
IChessPieceMover cpm = ModelLocator.ChessPieceMover;
IPiece movingPiece = GetPiece(ActivePlayerColor, capture.StartingPosition);
ChessPosition locationOfLostPiece
= ModelLocator.EnPassantHelper.GetLocationOfPieceBeingCaptured(movingPiece, capture);
IPiece lostPiece = GetPiece(InactivePlayerColor, locationOfLostPiece);
UpdateBoardForEnPassant(movingPiece as IPawn, capture, lostPiece as IPawn);
return(lostPiece.Value);
}
private void GenerateSouthWestCaptures(IBoardState owningPlayerBoardState, IBoardState enemyBoardState,
IChessPieceMover cpm)
{
GenerateDirectionalCaptures(owningPlayerBoardState, enemyBoardState, cpm.SouthWest);
}
private void GenerateWestMoves(IBoardState boardState, IChessPieceMover cpm)
{
GenerateDirectionalMoves(boardState, cpm.West);
}
private void GenerateNorthCaptures(IBoardState owningPlayerBoardState, IBoardState enemyBoardState,
IChessPieceMover cpm)
{
GenerateDirectionalCaptures(owningPlayerBoardState, enemyBoardState, cpm.North);
}
private void GenerateNorthMoves(IBoardState boardState, IChessPieceMover cpm)
{
GenerateDirectionalMoves(boardState, cpm.North);
}
private void GenerateWestSouthWestCapture(IBoardState enemyBoardState, IChessPieceMover cpm)
{
ChessPosition capture = cpm.West(cpm.SouthWest(Location));
AddCaptureToCaptureSet(capture, enemyBoardState);
}
private ChessPosition GenerateThreatenedWest(IChessPieceMover cpm)
{
return(Color == ChessColor.White ? cpm.NorthWest(Location) : cpm.SouthWest(Location));
}
private void GenerateNorthEastCaptures(IBoardState enemyBoardState, IChessPieceMover cpm)
{
ChessPosition capture = cpm.NorthEast(Location);
AddCaptureToCaptureSet(capture, enemyBoardState);
}
