public bool CanCaptureByEnPassant(ChessGameField.Cell[,] field, ChessGameField.Cell cellTo, Point posFrom, Point posTo, ChessMove lastMove)
{
if (cellTo.figure == null && (posFrom.X == posTo.X - 1 || posFrom.X == posTo.X + 1)) // En passant
{
if ((GetOwner() == Player.White && posFrom.Y == posTo.Y + 1)
|| (GetOwner() == Player.Black && posFrom.Y == posTo.Y - 1))
{
Figure opponentsFigure = field[posTo.X, posFrom.Y].figure;
if (opponentsFigure is Pawn && opponentsFigure.GetOwner() != GetOwner())
{
Pawn opponentsPawn = (Pawn)opponentsFigure;
if (lastMove.Fig == opponentsPawn && Math.Abs(lastMove.GetPrevPos().Y - posFrom.Y) == 2)
{
return true;
}
}
}
}
return false;
}
public bool CanMove(ChessGameField.Cell[,] field, Point posFrom, Point posTo, ChessMove lastMove)
{
ChessGameField.Cell cellTo = field[posTo.X, posTo.Y];
if (CanMoveOneStep(cellTo, posFrom, posTo))
{
return true;
}
else if (CanMoveTwoSteps(cellTo, posFrom, posTo))
{
return true;
}
else if (CanCapture(cellTo, posFrom, posTo))
{
return true;
}
else if (CanCaptureByEnPassant(field, cellTo, posFrom, posTo, lastMove))
{
return true;
}
return false;
}
public ChessMove Move(ref ChessGameField.Cell[,] field, Point posFrom, Point posTo, ChessMove lastMove)
{
ChessGameField.Cell cellTo = field[posTo.X, posTo.Y];
ChessMove move = new ChessMove();
if (CanMoveOneStep(cellTo, posFrom, posTo))
{
move.AddAction(new ChessMove.MoveAction(posFrom, posTo));
return move;
}
else if (CanMoveTwoSteps(cellTo, posFrom, posTo))
{
move.AddAction(new ChessMove.MoveAction(posFrom, posTo));
return move;
}
else if (CanCapture(cellTo, posFrom, posTo))
{
move.AddAction(new ChessMove.RemoveAction(posTo));
move.AddAction(new ChessMove.MoveAction(posFrom, posTo));
return move;
}
else if (CanCaptureByEnPassant(field, cellTo, posFrom, posTo, lastMove))
{
move.AddAction(new ChessMove.RemoveAction(new Point(posTo.X, posFrom.Y)));
move.AddAction(new ChessMove.MoveAction(posFrom, posTo));
return move;
}
return null;
}
public bool MakeMove(Player player, Point from, Point to)
{
if (!IsPosValid(from) || !IsPosValid(to) || (from.X == to.X && from.Y == to.Y))
{
return false;
}
ChessFigure figure = GetCell(from).figure;
if (figure != null && figure.GetOwner() == player)
{
ChessMove move = figure.Move(ref Field, from, to, LastMove);
if (move != null)
{
move.Do(ref Field, figure);
if (IsKingInCheck(player))
{
move.UnDo(ref Field);
return false;
}
LastMove = move;
return true;
}
}
return false;
}