private Queen PromoteAiPawn(GamePiece piece)
{
Queen newPiece = new Queen(piece.Place, piece.Color);
return(newPiece);
}
public Bishop(GamePiece piece) : base(piece)
{
} // Virtual
private void _btnQueen_Click(object sender, RoutedEventArgs e)
{
ReturnGamePiece = new Queen();
Close();
}
public King(GamePiece piece) : base(piece)
{
} // Virtual
private void _btnBishop_Click(object sender, RoutedEventArgs e)
{
ReturnGamePiece = new Bishop();
Close();
}
private void _btnRook_Click(object sender, RoutedEventArgs e)
{
ReturnGamePiece = new Rook();
Close();
}
public Queen(GamePiece piece) : base(piece)
{
} // Virtual
private void _btnKnight_Click(object sender, RoutedEventArgs e)
{
ReturnGamePiece = new Knight();
Close();
}
public Rook(GamePiece piece) : base(piece)
{
} // Virtual
// Investigates if a move is Legal
private Condition MovePossibility(GamePiece piece, Cell fromCell, Cell toCell, Condition condition)
{
Condition result = Condition.Default;
if (fromCell == toCell)
{
return(Condition.Active); // Already there
}
if (toCell.Piece is null) // cell is Empty
{
// Legal Neutral
if (condition == Condition.Default || condition == Condition.Neutral)
{
result = Condition.Neutral;
}
// Legal Pawn Enpassant Move
else if (piece is Pawn && condition == Condition.Attack && !(toCell.enPassantPawn is null))
{
result = Condition.enPassant;
}
}
else if (toCell.Piece != null && toCell.Piece.TeamColor != piece.TeamColor) // cell is Enemy
{
// Legal Attack
if (condition == Condition.Default || condition == Condition.Attack)
{
result = Condition.Attack;
}
}
if (condition == Condition.Castling)
{
Player player = piece.TeamColor == PlayerOne.TeamColor ? PlayerOne : PlayerTwo;
// get Rook
int xDirection = fromCell.ID.X > toCell.ID.X ? -1 : 1;
Point rookLocation = xDirection == 1 ? new Point(7, fromCell.ID.Y) : new Point(0, fromCell.ID.Y);
Rook rook = (Rook)player.MyPieces.Find(gp => gp.ID == rookLocation && gp.moveCount == 0 && gp.isAlive);
if (rook is null)
{
result = Condition.Illegal; // Rook is missing
}
else
{
if (piece.moveCount != 0 && rook.moveCount != 0)
{
result = Condition.Illegal; // Cannot Castle when King & Rook are not in original locations
}
else
{
Cell focus = Cells.NextCell(fromCell, new Point(xDirection, 0));
while (focus.Piece is null) // find next gamepiece in the movement direction
{
focus = Cells.NextCell(focus, new Point(xDirection, 0));
}
if (!ReferenceEquals(rook, focus.Piece))
{
result = Condition.Illegal; // Other Pieces in the way
}
else
{
if (player.isChecked == true)
{
result = Condition.Illegal; // Cannot Castle when in Check
}
else
{
Point passThrough = new Point(fromCell.ID.X + xDirection, fromCell.ID.Y);
if (!IsSafe(passThrough, WhosTurn))
{
result = Condition.Illegal; // Cannot Castle through Check
}
else
{
result = Condition.Castling; // Castling Permitted! (Well still one more test in PossibleMoves())
}
}
}
}
}
}
return(result);
}
/// <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);
}
public Knight(GamePiece piece) : base(piece)
{
} // Virtual
public Pawn(GamePiece piece) : base(piece)
{
} // Virtual