public Piece(Piece piece)
{
this.type = piece.getType();
this.color = piece.getColor();
this.position = piece.getPosition();
this.numberOfMoves = piece.numberOfMoves;
}
public static Dictionary <Position, bool?> validMoves(Piece toBeMoved)
{
Dictionary <Position, bool?> moves = new Dictionary <Position, bool?>();
for (int x = 0; x < 8; ++x)
{
for (int y = 0; y < 8; ++y)
{
Position to = new Position(x, y);
Piece moveTo = board.at(to);
bool? valid = Rules.validMove(toBeMoved, to);
if (valid == true && moveTo.getType() != "blank")
{
valid = null;
}
if (valid != false)
{
move(toBeMoved.getPosition(), moveTo.getPosition(), false);
if (IsChecked(toBeMoved.getColor()))
{
valid = false;
}
undo();
}
moves.Add(to, valid);
}
}
return(moves);
}
public Piece(Piece piece)
{
this.type = piece.getType();
this.color = piece.getColor();
this.position = piece.getPosition();
this.numberOfMoves = piece.numberOfMoves;
}
private static bool pawnValid(Piece p, Position from, Position to)
{
int xDist = from.x - to.x;
int yDist = from.y - to.y;
int direction = p.getColor() == "white" ? -1 : 1;
if (from.y + direction > 7 || from.y + direction < 0)
{
return(false);
}
if (from.y + direction != to.y && ((from.y + 2 * direction != to.y && p.getNumberOfMoves() == 0) || !Chess.IsEmpty(new Position(from.x, from.y + direction)) || p.getNumberOfMoves() > 0))
{
return(false);
}
if (xDist < -1 || xDist > 1)
{
return(false);
}
if (xDist == 0 && !Chess.IsEmpty(to))
{
return(false);
}
if (xDist * xDist == 1 && yDist * yDist != 1)
{
return(false);
}
if (xDist != 0 && (Chess.IsEmpty(to) || Chess.IsSame(p, to)))
{
return(false);
}
return(true);
}
public void repaint()
{
Dispatcher.Invoke(DispatcherPriority.Input, new ThreadStart(() =>
{
String turn = Chess.WhosTurn();
Turn.Content = char.ToUpper(turn[0]) + turn.Substring(1) + "'s turn";
bool black = false;
for (int y = 0; y < 8; ++y)
{
for (int x = 0; x < 8; ++x)
{
Label l = FindChild <Label>(ChessBoard, "board_" + x + y);
if (l != null)
{
l.MouseLeftButtonDown -= showMoves;
l.MouseLeftButtonDown -= move;
l.MouseLeftButtonDown -= repaint;
Piece current = Chess.board.at(new Position(x, y));
String type = current.visual();
l.Content = type;
l.Background = black ? new SolidColorBrush(Color.FromArgb(150, 0, 0, 0)) : new SolidColorBrush(Color.FromArgb(205, 255, 255, 255));
if (current.getColor() == Chess.WhosTurn())
{
if (current.getType() == "king")
{
if (Chess.IsChecked(Chess.WhosTurn()))
{
l.Background = Brushes.LightCoral;
}
}
l.Cursor = Cursors.Hand;
l.MouseLeftButtonDown += showMoves;
}
else
{
l.Cursor = Cursors.Arrow;
}
}
black = !black;
}
black = !black;
}
ChessMove latestMove = Chess.computerMove;
if (latestMove != null)
{
Label last = FindChild <Label>(ChessBoard, "board_" + latestMove.from.x + latestMove.from.y);
last.Background = Brushes.GreenYellow;
last = FindChild <Label>(ChessBoard, "board_" + latestMove.to.x + latestMove.to.y);
last.Background = Brushes.GreenYellow;
}
}));
}
public Position findKing(string color)
{
for (int x = 0; x < 8; ++x)
{
for (int y = 0; y < 8; ++y)
{
Piece current = at(new Position(x, y));
if (current.getType() == "king" && current.getColor() == color)
{
return(new Position(x, y));
}
}
}
return(null);
}
public static void undo()
{
Piece last = board.at(lastMove.to);
if (last.getType() == "pawn" && (lastMove.from.y == 1 && last.getColor() == "black" || lastMove.from.y == 6 && last.getColor() == "white"))
{
last.numberOfMoves = 0;
}
else
{
last.numberOfMoves--;
}
last.setPosition(lastMove.from);
board.set(lastMove.from, last);
board.set(lastMove.to, pieceRemoved);
}
private static List <Piece> getPieces(string color)
{
List <Piece> pieces = new List <Piece>();
for (int x = 0; x < 8; ++x)
{
for (int y = 0; y < 8; ++y)
{
Position pos = new Position(x, y);
Piece p = board.at(pos);
if (p.getColor().Equals(color))
{
pieces.Add(p);
}
}
}
return(pieces);
}
private static bool kingValid(Piece p, Position from, Position to)
{
int xDist = to.x - from.x;
int yDist = to.y - from.y;
//Check for valid castling
if (p.numberOfMoves == 0 && yDist == 0 && (xDist == 2 || xDist == -2))
{
int direction = xDist == 2 ? 1 : -2;
Piece p2 = Chess.board.at(new Position(to.x + direction, from.y));
if (Chess.IsSame(p, p2.getPosition()) && p2.getType() == "rook" && p2.numberOfMoves == 0 && !Chess.IsChecked(p.getColor()))
{
return rookValid(p, from, to);
}
}
if (!((xDist * xDist) <= 1 && (yDist * yDist) <= 1))
{
return false;
}
return !Chess.IsSame(p, to);
}
public static bool IsChecked(string color)
{
Position kingPos = board.findKing(color);
Piece king = board.at(kingPos);
for (int x = 0; x < 8; ++x)
{
for (int y = 0; y < 8; ++y)
{
Position from = new Position(x, y);
Piece p = board.at(from);
if (p.getColor() != king.getColor())
{
if (Rules.validMove(p, kingPos))
{
return(true);
}
}
}
}
return(false);
}
public static bool hasMoves()
{
for (int x = 0; x < 8; ++x)
{
for (int y = 0; y < 8; ++y)
{
Piece p = board.at(new Position(x, y));
if (p.getColor() != turn && p.getType() != "blank")
{
Position pos = new Position(x, y);
Dictionary <Position, bool?> moves = Chess.validMoves(p);
foreach (KeyValuePair <Position, bool?> kvp in moves)
{
if (kvp.Value != false)
{
return(true);
}
}
}
}
}
return(false);
}
private static void move(Position from, Position to, bool realMove)
{
lastMove = new ChessMove(from, to);
Piece p1 = board.at(from);
Piece p2 = board.at(to);
pieceRemoved = p2;
int xDiff = to.x - from.x;
if (p1.getType() == "king" && Math.Abs(xDiff) > 1 && realMove)
{
int xDir = xDiff < 0 ? -2 : 1;
Position rook = new Position(to.x + xDir, to.y);
xDir = xDiff < 0 ? 1 : -1;
board.at(rook).debug();
move(rook, new Position(to.x + xDir, to.y));
}
board.set(from, new Piece("blank", "none", from));
p1.numberOfMoves++;
if (p1.getType() == "pawn" && Math.Abs(to.y - from.y) == 2)
{
p1.numberOfMoves++;
}
p1.setPosition(to);
if (p1.getType() == "pawn" && (to.y == 0 || to.y == 7))
{
p1 = new Piece("queen", p1.getColor(), p1.getPosition(), p1.getNumberOfMoves());
}
board.set(to, p1);
}
public static bool IsSame(Piece p, Position pos)
{
return p.getColor() == board.at(pos).getColor() && !checkingOwn;
}
public static Dictionary<Position, bool?> validMoves(Piece toBeMoved)
{
Dictionary<Position, bool?> moves = new Dictionary<Position, bool?>();
for (int x = 0; x < 8; ++x)
{
for (int y = 0; y < 8; ++y)
{
Position to = new Position(x, y);
Piece moveTo = board.at(to);
bool? valid = Rules.validMove(toBeMoved, to);
if (valid == true && moveTo.getType() != "blank")
{
valid = null;
}
if (valid != false)
{
move(toBeMoved.getPosition(), moveTo.getPosition(), false);
if (IsChecked(toBeMoved.getColor()))
{
valid = false;
}
undo();
}
moves.Add(to, valid);
}
}
return moves;
}
private static bool pawnValid(Piece p, Position from, Position to)
{
int xDist = from.x - to.x;
int yDist = from.y - to.y;
int direction = p.getColor() == "white" ? -1 : 1;
if (from.y + direction > 7 || from.y + direction < 0) return false;
if (from.y + direction != to.y && ((from.y + 2 * direction != to.y && p.getNumberOfMoves() == 0) || !Chess.IsEmpty(new Position(from.x, from.y + direction)) || p.getNumberOfMoves() > 0))
{
return false;
}
if (xDist < -1 || xDist > 1)
{
return false;
}
if (xDist == 0 && !Chess.IsEmpty(to))
{
return false;
}
if (xDist * xDist == 1 && yDist * yDist != 1)
{
return false;
}
if (xDist != 0 && (Chess.IsEmpty(to) || Chess.IsSame(p, to)))
{
return false;
}
return true;
}
private static bool kingValid(Piece p, Position from, Position to)
{
int xDist = to.x - from.x;
int yDist = to.y - from.y;
//Check for valid castling
if (p.numberOfMoves == 0 && yDist == 0 && (xDist == 2 || xDist == -2))
{
int direction = xDist == 2 ? 1 : -2;
Piece p2 = Chess.board.at(new Position(to.x + direction, from.y));
if (Chess.IsSame(p, p2.getPosition()) && p2.getType() == "rook" && p2.numberOfMoves == 0 && !Chess.IsChecked(p.getColor()))
{
return(rookValid(p, from, to));
}
}
if (!((xDist * xDist) <= 1 && (yDist * yDist) <= 1))
{
return(false);
}
return(!Chess.IsSame(p, to));
}
public static bool IsSame(Piece p, Position pos)
{
return(p.getColor() == board.at(pos).getColor() && !checkingOwn);
}
