/// <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;
}
}
public void Should_GenerateOneMoveSouth()
{
// execute
ChessPosition position = _mover.South(ChessPosition.A2);
// verify
Assert.AreEqual(ChessPosition.A1, position);
}
private void GenerateSouthMoves(IBoardState boardState, IChessPieceMover cpm)
{
ChessPosition nextMove = cpm.South(Location);
if (!boardState.Contains(nextMove))
{
MoveSet.Add(nextMove);
}
}
private void GenerateSouthSouthWestMove(IBoardState boardState, IChessPieceMover cpm)
{
ChessPosition move = cpm.South(cpm.SouthWest(Location));
if (!boardState.Contains(move))
{
MoveSet.Add(move);
}
}
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);
}
private void GenerateSouthCaptures(IBoardState enemyBoardState, IChessPieceMover cpm)
{
ChessPosition capture = cpm.South(Location);
AddCaptureToCaptureSet(capture, enemyBoardState);
}