public static IEnumerable<Position> GetRookPositionIterator(Position p)
{
for (var x = -BoardRows; x <= BoardRows; x++)
{
if (x == 0)
{
continue;
}
var newPosition = new Position(p.X + x, p.Y);
if (IsValid(newPosition))
{
yield return newPosition;
}
}
for (var y = -BoardColumns; y <= BoardColumns; y++)
{
if (y == 0)
{
continue;
}
var newPosition = new Position(p.X, p.Y + y);
if (IsValid(newPosition))
{
yield return newPosition;
}
}
}
public Pawn(Position p, Color c) : base(p, c)
{
if (base.getColor() == Color.Black)
{
base.setImage(new Bitmap(Board.getInstance().getPath() + "//BlackPawn.gif"));
}
else {
base.setImage(new Bitmap(Board.getInstance().getPath() + "//WhitePawn.gif"));
}
}
public override string ToString()
{
String repr = String.Empty;
int col;
int row;
for (row = BOARD_DIMENSION - 1; row >= 0; row--)
{
repr += " -";
for (col = 0; col < BOARD_DIMENSION; col++)
{
repr += "----";
}
repr += "\n";
repr += String.Format(" {0} |", row + 1);
for (col = 0; col < BOARD_DIMENSION; col++)
{
Position p = new Position(col, row);
if (isPieceAtPosition(p))
{
repr += String.Format(" {0} |", getPieceAtPosition(p).Avatar);
}
else
{
repr += " |";
}
}
repr += "\n";
}
repr += " -";
for (col = 0; col < BOARD_DIMENSION; col++)
{
repr += "----";
}
repr += "\n";
repr += " ";
Char colChar = 'a';
for (col = 0; col < BOARD_DIMENSION; col++)
{
repr += String.Format(" {0} ", colChar);
colChar++;
}
repr += "\n";
return repr;
}
/*
* Checks whether a given position is valid as a next move.
*/
public bool isvalidMove(Position newPosition)
{
Iterator iterator = allowedMovements.getIterator();
while (iterator.MoveNext())
{
Position p = iterator.Current as Position;
if (p.Equals(newPosition))
{
return true;
}
}
return false;
}
public static Boolean tryParse(String input, out Position result)
{
char col;
int row;
if ((input.Length >= 2) &&
(input[0] >= 'a' && input[0] <= 'h') &&
(Int32.TryParse(input.Substring(1, 1), out row)))
{
col = input[0];
result = new Position(col, row);
return true;
}
else
{
result = null;
return false;
}
}
static void Main(string[] args)
{
var position = new Position(5, 5);
Console.WriteLine("Starting position: " + position);
var knightMoves = Position.GetKnightPositionIterator(position);
Console.WriteLine("---- Knight moves ----");
foreach (var p in knightMoves)
{
Console.WriteLine(p.ToString());
}
Console.WriteLine();
var rookMoves = Position.GetRookPositionIterator(position);
Console.WriteLine("---- Rook moves ----");
foreach (var p in rookMoves)
{
Console.WriteLine(p.ToString());
}
Console.WriteLine();
var bishopMoves = Position.GetBishopPositionIterator(position);
Console.WriteLine("---- Bishop moves ----");
foreach (var p in bishopMoves)
{
Console.WriteLine(p.ToString());
}
Console.WriteLine();
var quennMoves = Position.GetQueenPositionIterator(position);
Console.WriteLine("---- Queen moves ----");
foreach (var p in quennMoves)
{
Console.WriteLine(p.ToString());
}
Console.WriteLine();
Console.Read();
}
/** return an iterator that will return all positions
* that a knight may reach from a given starting position.
*/
public static IEnumerable<Position> GetKnightPositionIterator(Position p)
{
for (var x = -2; x <= 2; x++)
{
for (var y = -2; y <= 2; y++)
{
if (Math.Abs(x) + Math.Abs(y) != 3)
{
continue;
}
var newPosition = new Position(p.X + x, p.Y + y);
if (IsValid(newPosition))
{
yield return newPosition;
}
}
}
}
/*
* This constructor is used in the clone method
*/
public List(ArrayList l)
{
list = new ArrayList();
foreach (Piece p in l)
{
Position pos = new Position(p.getPosition().getRow(), p.getPosition().getColumn());
Color color = p.getColor();
Image image = p.getImage();
Piece piece = null;
if (p is Bishop)
{
piece = new Bishop(pos, color);
}
else if (p is Knight)
{
piece = new Knight(pos, color);
}
else if (p is Pawn)
{
piece = new Pawn(pos, color);
}
else if (p is Queen)
{
piece = new Queen(pos, color);
}
else if (p is Rook)
{
piece = new Rook(pos, color);
}
else if (p is King)
{
piece = new King(pos, color);
}
list.Add(piece);
}
}
public static IEnumerable<Position> GetBishopPositionIterator(Position p)
{
for (var x = -BoardRows; x <= BoardRows; x++)
{
if (x == 0)
{
continue;
}
var newPosition = new Position(p.X + x, p.Y + x);
if (IsValid(newPosition))
{
yield return newPosition;
}
newPosition = new Position(p.X + x, p.Y - x);
if (IsValid(newPosition))
{
yield return newPosition;
}
}
}
public King(Color color, Position position)
: base(color, position)
{
character = (color == Color.Black) ? '\u265A' : '\u2654';
}
public Bishop(Color color, Position position)
: base(color, position)
{
character = (color == Color.Black) ? '\u265D' : '\u2657';
}
public Square(Position p)
{
position = p;
}
public Piece GetPieceAtPosition(Position position)
{
return piecesinplay.Where(i => i.Position.Equals(position))
.Select(i => i.Piece)
.FirstOrDefault();
}
Boolean isPositionOnBoard(Position position)
{
if (position.Column < 0 || position.Column >= BOARD_DIMENSION)
return false;
if (position.Row < 0 || position.Row >= BOARD_DIMENSION)
return false;
return true;
}
public InPlay(Piece piece, Position position)
{
Piece = piece;
Position = position;
}
public void PutPieceInPlay(Piece piece, Position position)
{
piecesinplay.Add(new InPlay(piece,position));
}
void Announce(Piece piece, Position position)
{
Message = string.Format("{0} to {1}", piece, position);
}
public void MovePieceTo(Piece piece,Position to)
{
var toMove = piecesinplay.Where(p => p.Piece.Equals(piece))
.FirstOrDefault();
if (toMove == null) throw new InvalidOperationException("No such piece in play " + piece);
var move = new Move(toMove.Position,to,piece,isfirst);
if(move.Valid())
{
move.Apply(piecesinplay);
Announce(piece, to);
}
else
AnnounceIllegalMove();
isfirst = false;
}
public Position.Placement validPosition(IPiece piece, Position position)
{
if (!isPositionOnBoard(position))
return Position.Placement.ILLEGAL;
if (isPieceAtPosition(position))
{
IPiece occupier = getPieceAtPosition(position);
if (piece.isFriendly(occupier))
return Position.Placement.BLOCKED;
else
return Position.Placement.CAPTURE;
}
return Position.Placement.VALID;
}
public IPiece getPieceAtPosition(Position p)
{
return board[p.Column, p.Row];
}
/*
* Checks whether there is a piece in a given position
*/
public Piece consultPiece(Position p, bool white)
{
Iterator it;
if (white)
{
it = whitePieces.getIterator();
}
else {
it = blackPieces.getIterator();
}
while (it.MoveNext())
{
Piece piece = (it.Current as Piece);
if (piece.getPosition().Equals(p))
{
return piece;
}
}
return null;
}
/*
* Deletes a piece from a given position. In case of "pawn promotion", do not put into deleted pieces set.
*/
public Piece killPiece(Position pos, bool promotion)
{
bool found = false;
Piece piece = null;
Iterator it = whitePieces.getIterator();
while (it.MoveNext())
{
Piece p = (it.Current as Piece);
if (p.getPosition().Equals(pos))
{
piece = p;
if (!promotion)
{
mainForm.getWhiteImages().Images.Add(p.getImage());
}
whitePieces.remove(p);
found = true;
break;
}
}
if (!found)
{
it = blackPieces.getIterator();
while (it.MoveNext())
{
Piece p = (it.Current as Piece);
if (p.getPosition().Equals(pos))
{
piece = p;
if (!promotion)
{
mainForm.getBlackImages().Images.Add(p.getImage());
}
blackPieces.remove(p);
break;
}
}
}
return piece;
}
/*
* This method updates the set of allowed movements. Implememts an abstract method from Piece.cs
*/
public override void updateAllowedMovements()
{
this.allowedMovements.clear();
int row = position.getRow();
int column = position.getColumn();
int i, j;
Position currentPos;
if (this.color == Color.Black) //Black pawn
{
//Down
i = row + 1;
j = column;
if (i <= 7)
{
currentPos = new Position(i, j);
if (Board.getInstance().consultPiece(currentPos, true) == null
&& Board.getInstance().consultPiece(currentPos, false) == null)
{
this.allowedMovements.insert(currentPos);
}
}
//2 positions down for first movement
if (row == 1 && Board.getInstance().consultPiece(new Position(2, column), true) == null
&& Board.getInstance().consultPiece(new Position(2, column), false) == null
&& Board.getInstance().consultPiece(new Position(3, column), true) == null)
{
checkSquare(new Position(row + 2, column));
}
//Down-right diagonal, only to atack
i = row + 1;
j = column + 1;
if (i < Board.NUM_ROWS && j < Board.NUM_ROWS)
{
currentPos = new Position(i, j);
if (Board.getInstance().consultPiece(currentPos, true) != null) //Opponent's piece
{
this.allowedMovements.insert(currentPos);
}
}
//Down-left diagonal, only to atack
i = row + 1;
j = column - 1;
if (i < Board.NUM_ROWS && j >= 0)
{
currentPos = new Position(i, j);
if (Board.getInstance().consultPiece(currentPos, true) != null) //Opponent's piece
{
this.allowedMovements.insert(currentPos);
}
}
}
else { // White pawn
//Up
i = row - 1;
j = column;
if (i >= 0)
{
currentPos = new Position(i, j);
if (Board.getInstance().consultPiece(currentPos, true) == null
&& Board.getInstance().consultPiece(currentPos, false) == null)
{
this.allowedMovements.insert(currentPos);
}
}
//Two positions up for first movement
if (row == 6 && Board.getInstance().consultPiece(new Position(5, column), true) == null
&& Board.getInstance().consultPiece(new Position(5, column), false) == null
&& Board.getInstance().consultPiece(new Position(4, column), false) == null)
{
checkSquare(new Position(row - 2, column));
}
//Up-right diagonal, only to attack
i = row - 1;
j = column + 1;
if (i >= 0 && j < Board.NUM_ROWS)
{
currentPos = new Position(i, j);
if (Board.getInstance().consultPiece(currentPos, false) != null) //Opponent's piece
{
this.allowedMovements.insert(currentPos);
}
}
//Up-left diagonal, only to attack
i = row - 1;
j = column - 1;
if (i >= 0 && j >= 0)
{
currentPos = new Position(i, j);
if (Board.getInstance().consultPiece(currentPos, false) != null) // Opponent's piece
{
this.allowedMovements.insert(currentPos);
}
}
}
}
public bool IsValid(Position from, Position to)
{
return (from.y - to.y) < yoffset;
}
public static bool IsValid(Position p)
{
return 0 <= p.X && p.X <= BoardRows
&& 0 <= p.Y && p.Y <= BoardColumns;
}
public bool Equals(Position other)
{
return other.x == x && other.y == y;
}
public void MoveTo(Position position)
{
Position = position;
}
Boolean isPieceAtPosition(Position p)
{
return (getPieceAtPosition(p) != null);
}
public static IEnumerable<Position> GetQueenPositionIterator(Position p)
{
return GetRookPositionIterator(p).Concat(GetBishopPositionIterator(p));
}
public Move(Position from,Position to, Piece piece,bool isfirst)
{
this.from = from;
this.to = to;
this.piece = piece;
this.isfirst = isfirst;
}
