private void UndoMove(Position source, Position target, Piece capturedPiece)
{
Piece p = Board.RemovePiece(target);
p.DecreaseMoveCount();
if (capturedPiece != null)
{
Board.PlacePiece(capturedPiece, target);
Captured.Remove(capturedPiece);
}
Board.PlacePiece(p, source);
// #Special move - Castling - Kingside Rook
if (p is King && target.Column == source.Column + 2)
{
Position rookSource = new Position(source.Row, source.Column + 3);
Position rookTarget = new Position(source.Row, source.Column + 1);
Piece rook = Board.RemovePiece(rookTarget);
rook.DecreaseMoveCount();
Board.PlacePiece(rook, rookSource);
}
// #Special move - Castling - Queenside Rook
if (p is King && target.Column == source.Column - 2)
{
Position rookSource = new Position(source.Row, source.Column - 4);
Position rookTarget = new Position(source.Row, source.Column - 1);
Piece rook = Board.RemovePiece(rookTarget);
rook.DecreaseMoveCount();
Board.PlacePiece(rook, rookSource);
}
// #Special move - En Passant
if (p is Pawn)
{
if (source.Column != target.Column && capturedPiece == EnPassantVulnerable)
{
Piece pawn = Board.RemovePiece(target);
Position pawnPosition;
if (p.Color == Color.White)
{
pawnPosition = new Position(3, target.Column);
}
else
{
pawnPosition = new Position(4, target.Column);
}
Board.PlacePiece(pawn, pawnPosition);
}
}
}
/// <summary>
/// Undoes the movement
/// </summary>
/// <param name="origin"></param>
/// <param name="destination"></param>
/// <param name="capturedPiece"></param>
public void UndoMovement(Position origin, Position destination, Piece capturedPiece)
{
Piece p = Board.RemovePiece(destination);
p.DecrementMovements();
if (capturedPiece != null)
{
Board.PlacePiece(capturedPiece, destination);
Captured.Remove(capturedPiece);
}
Board.PlacePiece(p, origin);
// SPECIAL PLAY SMALL CASTLING
if (p is King && destination.Column == origin.Column + 2)
{
Position rookOrigin = new Position(origin.Line, origin.Column + 3);
Position rookDest = new Position(origin.Line, origin.Column + 1);
Piece rook = Board.RemovePiece(rookDest);
rook.IncrementMovements();
Board.PlacePiece(rook, rookOrigin);
}
// SPECIAL PLAY BIG CASTLING
if (p is King && destination.Column == origin.Column - 2)
{
Position rookOrigin = new Position(origin.Line, origin.Column - 4);
Position rookDest = new Position(origin.Line, origin.Column - 1);
Piece rook = Board.RemovePiece(rookDest);
rook.IncrementMovements();
Board.PlacePiece(rook, rookOrigin);
}
// SPECIAL PLAY EN PASSANT
if (p is Pawn)
{
if (origin.Column != destination.Column && capturedPiece == VulnerableEnPassant)
{
Piece pawn = Board.RemovePiece(destination);
Position pawnPos;
if (p.Color == Color.White)
{
pawnPos = new Position(3, destination.Column);
}
else
{
pawnPos = new Position(4, destination.Column);
}
Board.PlacePiece(pawn, pawnPos);
}
}
}