public static void ChecknFlagEnpassant(List <Cell> cells, ChessMove move, bool undoMove = false)
{
//Check if Pawn that went 2 steps - (Enpassant)
if (move.PieceMoved is Pawn && Math.Abs(move.From.ID.Y - move.To.ID.Y) == 2)
{
int step = (move.To.ID.Y - move.From.ID.Y) / 2;
Point firstStep = new Point(0, step);
Cell passedCell = cells.NextCell(move.From, firstStep);
if (undoMove)
{
passedCell.enPassantPawn = null;
}
else
{
passedCell.enPassantPawn = move.PieceMoved;
}
// Set first step as Enpassant - (Link Pawn) remove next turn
}
}
/// <summary>
/// Returns list of All legal ChessMoves for a GamePiece
/// </summary>
/// <param name="piece">GamePiece that is being investigated</param>
public List <ChessMove> PossibleMoves(GamePiece piece)
{
if (piece is null)
{
return(null); // illegal - Empty space
}
Player activePlayer = piece.TeamColor == PlayerOne.TeamColor ? PlayerOne : PlayerTwo;
Cell fromCell = Cells.GetCell(piece.Location);
List <ChessMove> possibleMoves = new List <ChessMove>(); // Returning List of Possible Moves
GamePiece king = activePlayer.MyPieces.Find(gp => gp is King);
//List<BlindMove> blindMoves = fromCell.Piece.BlindMoves(); // Blind move instructions for Gamepiece
foreach (BlindMove bMove in fromCell.Piece.BlindMoves()) // Blind move instructions for Gamepiece
{
Cell focusCell = Cells.NextCell(fromCell, bMove.Direction); // The Starting Point
int moveCount = 0;
Condition moveType = Condition.Neutral;
// Increment through Instruction
while (!(focusCell is null) && bMove.Limit != moveCount && moveType == Condition.Neutral)
{
moveType = MovePossibility(fromCell.Piece, fromCell, focusCell, bMove.Condition);
// ADD to List of Possible ChessMoves
if (moveType == Condition.Neutral || moveType == Condition.Attack || moveType == Condition.enPassant || moveType == Condition.Castling)
{
ChessMove move;
if (moveType == Condition.enPassant) // *Special Move - Pawn captures Pawn via Enpassant
{
GamePiece captured = Cells.Find(c => !(c.enPassantPawn is null)).enPassantPawn;
move = new ChessMove(fromCell, focusCell, fromCell.Piece, captured, moveType, Cells.GetCell(captured.Location));
}
else if (moveType == Condition.Castling) // *Special Move - Castling, insert Rook into ChessMove
{
Rook rook = (Rook)Cells.GetCell((Point)bMove.OtherInfo).Piece;
int xDirection = bMove.Direction.X / 2;
Cell rookFrom = Cells.GetCell(rook.Location);
Cell rookTo = Cells.GetCell(new Point(fromCell.ID.X + xDirection, fromCell.ID.Y));
ChessMove rookMove = new ChessMove(rookFrom, rookTo, rook, null, Condition.Castling);
move = new ChessMove(fromCell, focusCell, fromCell.Piece, null, moveType, rookMove);
}
else // Regular Move
{
move = new ChessMove(fromCell, focusCell, fromCell.Piece, focusCell.Piece, moveType);
}
//Look in the future
move = MovePiece(move, true);
bool isKingSafe = IsSafe(king.Location, activePlayer);
move = UndoMovePiece(move, true);
if (isKingSafe)
{
possibleMoves.Add(move);
}
}
focusCell = Cells.NextCell(focusCell, bMove.Direction);
moveCount++;
}
}
return(possibleMoves);
}
