public override BaseChessPiece GetCaptured(Point2D at, ref bool enpassant)
{
BaseChessPiece basePiece = base.GetCaptured(at, ref enpassant);
if (basePiece != null && basePiece.Color != m_Color)
{
return(basePiece); // Normal capture
}
if (at.X == m_Position.X)
{
return(null); // Straight movement
}
Point2D p = new Point2D(at.X, m_Position.Y);
basePiece = m_BChessboard[p];
if (basePiece != null && basePiece.Color != m_Color)
{
enpassant = true;
return(basePiece);
}
else
{
return(null);
}
}
public override bool CanMoveTo(Point2D newLocation, ref string err)
{
if (!base.CanMoveTo(newLocation, ref err))
{
return(false);
}
// Care only about absolutes for knights
int dx = Math.Abs(newLocation.X - m_Position.X);
int dy = Math.Abs(newLocation.Y - m_Position.Y);
if (!((dx == 1 && dy == 2) || (dx == 2 && dy == 1)))
{
err = "Knights can only make L shaped moves (2-3 tiles length)";
return(false); // Wrong move
}
// Verify target piece
BaseChessPiece piece = m_BChessboard[newLocation];
if (piece == null || piece.Color != m_Color)
{
return(true);
}
else
{
err = "You can't capture pieces of your same color";
return(false);
}
}
public override ArrayList GetMoves(bool capture)
{
ArrayList moves = new ArrayList();
for (int dx = -2; dx <= 2; dx++)
{
for (int dy = -2; dy <= 2; dy++)
{
if (!((Math.Abs(dx) == 1 && Math.Abs(dy) == 2) || (Math.Abs(dx) == 2 && Math.Abs(dy) == 1)))
{
continue;
}
Point2D p = new Point2D(m_Position.X + dx, m_Position.Y + dy);
if (!m_BChessboard.IsValid(p))
{
continue;
}
BaseChessPiece piece = m_BChessboard[p];
if (piece == null)
{
moves.Add(p);
}
else if (capture && piece.Color != m_Color)
{
moves.Add(p);
}
}
}
return(moves);
}
/// <summary>
/// Creates a new Move object without capturing a piece
/// </summary>
/// <param name="piece">The chess piece performing the move</param>
/// <param name="target">The target location of the move</param>
public Move( BaseChessPiece piece, Point2D target )
{
m_Piece = piece;
m_From = m_Piece.Position;
m_To = target;
m_Captured = m_Piece.GetCaptured( target, ref m_EnPassant );
}
/// <summary>
/// Callback for selecting the piece to move
/// </summary>
public void OnPickPieceTarget(Mobile from, object targeted)
{
m_Black.CloseGump(typeof(EndGameGump));
m_White.CloseGump(typeof(EndGameGump));
if (!(targeted is IPoint2D))
{
from.SendMessage(0x40, "Invalid selection");
SendMoveTarget(from);
return;
}
BaseChessPiece piece = m_Board[m_Board.WorldToBoard(new Point2D(targeted as IPoint2D))];
if (piece == null || piece.Color != GetColor(from))
{
from.SendMessage(0x40, "Invalid selection");
SendMoveTarget(from);
return;
}
m_MovingPiece = piece;
from.Target = new ChessTarget(this, from, "Where do you wish to move?",
OnPieceMove);
}
/// <summary>
/// Creates a new Move object without capturing a piece
/// </summary>
/// <param name="piece">The chess piece performing the move</param>
/// <param name="target">The target location of the move</param>
public Move(BaseChessPiece piece, Point2D target)
{
m_Piece = piece;
m_From = m_Piece.Position;
m_To = target;
m_Captured = m_Piece.GetCaptured(target, ref m_EnPassant);
}
public override ArrayList GetMoves(bool capture)
{
ArrayList moves = new ArrayList();
for (int dx = -1; dx <= 1; dx++)
{
for (int dy = -1; dy <= 1; dy++)
{
if (dx == 0 && dy == 0)
{
continue; // Can't move to same spot
}
Point2D p = new Point2D(m_Position.X + dx, m_Position.Y + dy);
if (!m_BChessboard.IsValid(p))
{
continue;
}
BaseChessPiece piece = m_BChessboard[p];
if (piece == null)
{
moves.Add(p);
}
else if (capture && piece.Color != m_Color)
{
moves.Add(p);
}
}
}
return(moves);
}
/// <summary>
/// Tries to perfrom a move. Will send any diagnostic messages to user if failed.
/// Will perform the move if it's valid.
/// </summary>
/// <param name="err">This string will hold any error messages if the move fails</param>
/// <param name="piece">The piece being moved</param>
/// <param name="to">The world location of the move target</param>
/// <returns>True if the move is legal</returns>
public bool TryMove(ref string err, BaseChessPiece piece, Point2D to)
{
Point2D p2 = WorldToBoard(to);
if (piece == null)
{
err = "You must select a piece for your move";
return(false);
}
if (!piece.CanMoveTo(p2, ref err))
{
return(false); // Invalid move
}
if (piece.IsCastle(p2))
{
// This move is making a castle. All needed verification is made by the AllowCastle() function.
Rook rook = piece as Rook;
if (rook == null)
{
rook = this[p2] as Rook;
}
m_IsMoving = true;
rook.Castle();
return(true);
}
Move move = new Move(piece, p2);
ApplyMove(move);
// bool ok = !IsCheck( piece.Color ) || IsCheckMate( piece.EnemyColor );
bool ok = !IsCheck(piece.Color);
UndoMove(move);
if (ok)
{
m_IsMoving = true;
piece.MoveTo(move);
foreach (BaseChessPiece pass in m_Table.Values)
{
if (pass != piece)
{
pass.AllowEnPassantCapture = false; // Reset en passant allowance
}
}
}
else
{
err = "That move would put your king under check";
}
return(ok);
}
public ChessMobile(BaseChessPiece piece) : base(AIType.AI_Use_Default, FightMode.None, 1, 1, 0.2, 0.2)
{
m_WayPoints = new List <WayPoint>();
InitStats(25, 100, 100);
m_Piece = piece;
Blessed = true;
Paralyzed = true;
Direction = m_Piece.Facing;
}
public ChessMobile( BaseChessPiece piece ) : base( AIType.AI_Use_Default, FightMode.None, 1, 1, 0.2, 0.2 )
{
m_WayPoints = new ArrayList();
InitStats( 25, 100, 100 );
m_Piece = piece;
Blessed = true;
Paralyzed = true;
Direction = m_Piece.Facing;
}
/// <summary>
/// Verifies if a given player is in check
/// </summary>
/// <param name="color">The color being examined</param>
/// <returns>True if the specified king is checked</returns>
public bool IsCheck(ChessColor color)
{
BaseChessPiece king = GetKing(color);
if (king == null)
{
// This occurs when the game is performing a simulation
// In this case a potential move kills the king,
// therefore the king is indeed attacked.
return(true);
}
return(IsAttacked(king.Position, king.EnemyColor));
}
/// <summary>
/// Callback for the move finalization
/// </summary>
public void OnPieceMove(Mobile from, object targeted)
{
string err = null;
if (!(targeted is IPoint2D))
{
err = "Invalid Move";
m_MovingPiece = null;
if (GetColor(from) == ChessColor.Black)
{
SendAllGumps(null, err);
}
else
{
SendAllGumps(err, null);
}
return;
}
if (!m_Board.TryMove(ref err, m_MovingPiece, new Point2D(targeted as IPoint2D)))
{
m_MovingPiece = null;
if (GetColor(from) == ChessColor.Black)
{
SendAllGumps(null, err);
}
else
{
SendAllGumps(err, null);
}
return;
}
// Move has been made. Wait until it's over
if (m_Status == GameStatus.WhiteToMove)
{
m_Status = GameStatus.WhiteMoving;
SendAllGumps("Making your move", null);
}
else
{
m_Status = GameStatus.BlackMoving;
SendAllGumps(null, "Making your move");
}
}
/// <summary>
/// Verifies if the specified mobile is the owner or a given chess piece
/// </summary>
/// <param name="m">The mobile being checked</param>
/// <param name="piece">The piece being examined for ownership</param>
/// <returns>True if the mobile is the owner of the specified piece</returns>
private bool IsOwner(Mobile m, BaseChessPiece piece)
{
if (m == m_Black && piece.Color == ChessColor.Black)
{
return(true);
}
else if (m == m_White && piece.Color == ChessColor.White)
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Gets the piece that this piece would capture when moving to a specific location.
/// This function assumes that the square can be reached.
/// </summary>
/// <param name="at">The target location with the potential capture</param>
/// <param name="enpassant">Will hold a value stating whether this move is made en passant</param>
/// <returns>A BaseChessPiece if a capture is possible, null otherwise</returns>
public virtual BaseChessPiece GetCaptured(Point2D at, ref bool enpassant)
{
enpassant = false;
BaseChessPiece piece = m_BChessboard[at];
if (piece != null && piece.Color != m_Color)
{
return(piece);
}
else
{
return(null);
}
}
public override bool CanMoveTo(Point2D newLocation, ref string err)
{
if (!base.CanMoveTo(newLocation, ref err))
{
return(false);
}
int dx = newLocation.X - m_Position.X;
int dy = newLocation.Y - m_Position.Y;
if (Math.Abs(dx) != Math.Abs(dy))
{
err = "Bishops can move only on diagonals";
return(false); // Not a diagonal movement
}
int xDirection = dx > 0 ? 1 : -1;
int yDirection = dy > 0 ? 1 : -1;
if (Math.Abs(dx) > 1)
{
// Verify that the path to target is empty
for (int i = 1; i < Math.Abs(dx); i++) // Skip the bishop square and stop before target
{
int xOffset = xDirection * i;
int yOffset = yDirection * i;
if (m_BChessboard[m_Position.X + xOffset, m_Position.Y + yOffset] != null)
{
err = "Bishops can't move over other pieces";
return(false);
}
}
}
// Verify target piece
BaseChessPiece piece = m_BChessboard[newLocation];
if (piece == null || piece.Color != m_Color)
{
return(true);
}
else
{
err = "You can't capture pieces of your own color";
return(false);
}
}
public override ArrayList GetMoves(bool capture)
{
ArrayList moves = new ArrayList();
int[] xDirection = new int[] { -1, 1, 0, 0 };
int[] yDirection = new int[] { 0, 0, 1, -1 };
for (int i = 0; i < 4; i++)
{
int xDir = xDirection[i];
int yDir = yDirection[i];
int offset = 1;
while (true)
{
Point2D p = new Point2D(m_Position.X + offset * xDir, m_Position.Y + offset * yDir);
if (!m_BChessboard.IsValid(p))
{
break;
}
BaseChessPiece piece = m_BChessboard[p];
if (piece == null)
{
moves.Add(p);
offset++;
continue;
}
if (capture && piece.Color != m_Color)
{
moves.Add(p);
break;
}
break;
}
}
return(moves);
}
public override bool CanMoveTo(Point2D newLocation, ref string err)
{
if (!base.CanMoveTo(newLocation, ref err))
{
return(false);
}
// Verify if this is a castle
BaseChessPiece rook = m_BChessboard[newLocation];
if (rook is Rook && rook.Color == m_Color)
{
// Trying to castle
return(m_BChessboard.AllowCastle(this, rook, ref err));
}
int dx = newLocation.X - m_Position.X;
int dy = newLocation.Y - m_Position.Y;
if (Math.Abs(dx) > 1 || Math.Abs(dy) > 1)
{
err = "The can king can move only 1 tile at a time";
return(false); // King can move only 1 tile away from its position
}
// Verify target piece
BaseChessPiece piece = m_BChessboard[newLocation];
if (piece == null || piece.Color != m_Color)
{
return(true);
}
else
{
err = "You can't capture pieces of your same color";
return(false);
}
}
/// <summary>
/// A pawn has been promoted and should be changed on the board
/// </summary>
/// <param name="pawn">The pawn that has been promoted</param>
/// <param name="to">The type of piece it should be promoted to</param>
public void OnPawnPromoted(BaseChessPiece pawn, PawnPromotion to)
{
BaseChessPiece promoted = null;
switch (to)
{
case PawnPromotion.Queen:
promoted = new Queen(this, pawn.Color, pawn.Position);
break;
case PawnPromotion.Rook:
promoted = new Rook(this, pawn.Color, pawn.Position);
break;
case PawnPromotion.Knight:
promoted = new Knight(this, pawn.Color, pawn.Position);
break;
case PawnPromotion.Bishop:
promoted = new Bishop(this, pawn.Color, pawn.Position);
break;
}
if (promoted != null)
{
m_Table[pawn.Position] = promoted;
pawn.Die(false);
}
PushGame(pawn.EnemyColor, null);
}
public override bool CanMoveTo(Point2D newLocation, ref string err)
{
if (!base.CanMoveTo(newLocation, ref err))
{
return(false);
}
int dx = newLocation.X - m_Position.X;
int dy = newLocation.Y - m_Position.Y;
if (dx == 0 || dy == 0)
{
// Straight movement
if (Math.Abs(dx) > 1) // If it's just 1 step no need to check for intermediate pieces
{
int direction = dx > 0 ? 1 : -1;
// Moving along X axis
for (int i = 1; i < Math.Abs(dx); i++)
{
int offset = direction * i;
if (m_BChessboard[m_Position.X + offset, m_Position.Y] != null)
{
err = "The queen can't move over other pieces";
return(false);
}
}
}
else if (Math.Abs(dy) > 1)
{
// Moving along Y axis
int direction = dy > 0 ? 1 : -1;
for (int i = 1; i < Math.Abs(dy); i++)
{
int offset = direction * i;
if (m_BChessboard[m_Position.X, m_Position.Y + offset] != null)
{
err = "The queen can't move over other pieces";
return(false);
}
}
}
}
else
{
// Diagonal movement
if (Math.Abs(dx) != Math.Abs(dy))
{
err = "The queen moves only on straight lines or diagonals";
return(false); // Uneven
}
if (Math.Abs(dx) > 1)
{
int xDirection = dx > 0 ? 1 : -1;
int yDirection = dy > 0 ? 1 : -1;
for (int i = 1; i < Math.Abs(dx); i++)
{
int xOffset = xDirection * i;
int yOffset = yDirection * i;
if (m_BChessboard[m_Position.X + xOffset, m_Position.Y + yOffset] != null)
{
err = "The queen can't move over other pieces";
return(false);
}
}
}
}
// Verify target piece
BaseChessPiece piece = m_BChessboard[newLocation];
if (piece == null || piece.Color != m_Color)
{
return(true);
}
else
{
err = "You can't capture pieces of your same color";
return(false);
}
}
/// <summary>
/// Adds a chess piece to the board table
/// </summary>
/// <param name="piece">The piece being added</param>
private void AddPiece(BaseChessPiece piece)
{
m_Table.Add(piece.Position, piece);
}
/// <summary>
/// Verifies if the specified mobile is the owner or a given chess piece
/// </summary>
/// <param name="m">The mobile being checked</param>
/// <param name="piece">The piece being examined for ownership</param>
/// <returns>True if the mobile is the owner of the specified piece</returns>
private bool IsOwner( Mobile m, BaseChessPiece piece )
{
if ( m == m_Black && piece.Color == ChessColor.Black )
return true;
else if ( m == m_White && piece.Color == ChessColor.White)
return true;
else
return false;
}
/// <summary>
/// Tries to perfrom a move. Will send any diagnostic messages to user if failed.
/// Will perform the move if it's valid.
/// </summary>
/// <param name="err">This string will hold any error messages if the move fails</param>
/// <param name="piece">The piece being moved</param>
/// <param name="to">The world location of the move target</param>
/// <returns>True if the move is legal</returns>
public bool TryMove( ref string err, BaseChessPiece piece, Point2D to )
{
Point2D p2 = WorldToBoard( to );
if ( piece == null )
{
err = "You must select a piece for your move";
return false;
}
if ( ! piece.CanMoveTo( p2, ref err ) )
{
return false; // Invalid move
}
if ( piece.IsCastle( p2 ) )
{
// This move is making a castle. All needed verification is made by the AllowCastle() function.
Rook rook = piece as Rook;
if ( rook == null )
rook = this[ p2 ] as Rook;
m_IsMoving = true;
rook.Castle();
return true;
}
Move move = new Move( piece, p2 );
ApplyMove( move );
// bool ok = !IsCheck( piece.Color ) || IsCheckMate( piece.EnemyColor );
bool ok = !IsCheck( piece.Color );
UndoMove( move );
if ( ok )
{
m_IsMoving = true;
piece.MoveTo( move );
foreach( BaseChessPiece pass in m_Table.Values )
{
if ( pass != piece )
pass.AllowEnPassantCapture = false; // Reset en passant allowance
}
}
else
{
err = "That move would put your king under check";
}
return ok;
}
/// <summary>
/// Verifies if the requested castle moved is allowed
/// </summary>
/// <param name="king">The King performing the castle</param>
/// <param name="rook">The Rook</param>
/// <param name="err">Will hold any error messages</param>
/// <returns>True if the castle move is allowed</returns>
public bool AllowCastle(BaseChessPiece king, BaseChessPiece rook, ref string err)
{
#region Castle Rules
// 1 Your king has been moved earlier in the game.
// 2 The rook that castles has been moved earlier in the game.
// 3 There are pieces standing between your king and rook.
// 4 The king is in check.
// 5 The king moves through a square that is attacked by a piece of the opponent.
// 6 The king would be in check after castling.
#endregion
if (king.HasMoved || rook.HasMoved)
{
err = "You can't castle if the rook or king have already moved";
return(false); // Rules 1 and 2
}
if (IsCheck(king.Color))
{
err = "You can't castle if your king is in check";
return(false); // Rule 4
}
bool queenside = rook.Position.X == 0;
if (queenside)
{
for (int i = 1; i < 4; i++)
{
if (this[i, king.Position.Y] != null)
{
err = "You can't castle if there are pieces between the king and the rook";
return(false); // Rule 3 queenside
}
}
}
else
{
if (this[5, king.Position.Y] != null || this[6, king.Position.Y] != null)
{
err = "You can't castle if there are pieces between the king and the rook";
return(false); // Rule 3 kingside
}
}
// King always moves 2
int kingX = king.Position.X + (queenside ? -2 : 2);
int kingTransit = king.Position.X + (queenside ? -1 : 1);
if (IsAttacked(new Point2D(kingTransit, king.Position.Y), king.EnemyColor))
{
err = "The king cannot move through a square that is under attack by the opponent";
return(false); // Rule 5
}
if (IsAttacked(new Point2D(kingX, king.Position.Y), king.EnemyColor))
{
err = "The king would be in check after the castle";
return(false); // Rule 6
}
return(true);
}
/// <summary>
/// Adds a chess piece to the board table
/// </summary>
/// <param name="piece">The piece being added</param>
private void AddPiece( BaseChessPiece piece )
{
m_Table.Add( piece.Position, piece );
}
/// <summary>
/// Callback for selecting the piece to move
/// </summary>
public void OnPickPieceTarget( Mobile from, object targeted )
{
m_Black.CloseGump( typeof( EndGameGump ) );
m_White.CloseGump( typeof( EndGameGump ) );
if ( ! ( targeted is IPoint2D ) )
{
from.SendMessage( 0x40, "Invalid selection" );
SendMoveTarget( from );
return;
}
BaseChessPiece piece = m_Board[ m_Board.WorldToBoard( new Point2D( targeted as IPoint2D ) ) ];
if ( piece == null || piece.Color != GetColor( from ) )
{
from.SendMessage( 0x40, "Invalid selection" );
SendMoveTarget( from );
return;
}
m_MovingPiece = piece;
from.Target = new ChessTarget( this, from, "Where do you wish to move?",
OnPieceMove );
}
/// <summary>
/// A pawn has been promoted and should be changed on the board
/// </summary>
/// <param name="pawn">The pawn that has been promoted</param>
/// <param name="to">The type of piece it should be promoted to</param>
public void OnPawnPromoted( BaseChessPiece pawn, PawnPromotion to )
{
BaseChessPiece promoted = null;
switch ( to )
{
case PawnPromotion.Queen:
promoted = new Queen( this, pawn.Color, pawn.Position );
break;
case PawnPromotion.Rook:
promoted = new Rook( this, pawn.Color, pawn.Position );
break;
case PawnPromotion.Knight:
promoted = new Knight( this, pawn.Color, pawn .Position );
break;
case PawnPromotion.Bishop:
promoted = new Bishop( this, pawn.Color, pawn.Position );
break;
}
if ( promoted != null )
{
m_Table[ pawn.Position ] = promoted;
pawn.Die( false );
}
PushGame( pawn.EnemyColor, null );
}
public override List <Point2D> GetMoves(bool capture)
{
List <Point2D> moves = new List <Point2D>();
int direction = m_Color == ChessColor.Black ? 1 : -1;
Point2D step = new Point2D(m_Position.X, m_Position.Y + direction);
if (m_BChessboard.IsValid(step) && m_BChessboard[step] == null)
{
moves.Add(step);
// Verify if this pawn can make a second step
step.Y += direction;
if (!m_HasMoved && m_BChessboard[step] == null)
{
moves.Add(step); // Point2D is a value type
}
}
if (capture)
{
// Verify captures too
Point2D p1 = new Point2D(m_Position.X + 1, m_Position.Y + direction);
Point2D p2 = new Point2D(m_Position.X - 1, m_Position.Y + direction);
if (m_BChessboard.IsValid(p1))
{
BaseChessPiece piece1 = m_BChessboard[p1];
if (piece1 != null && piece1.Color != m_Color)
{
moves.Add(p1);
}
else
{
Point2D pass1 = new Point2D(m_Position.X - 1, m_Position.Y);
if (m_BChessboard.IsValid(pass1))
{
BaseChessPiece passpiece1 = m_BChessboard[pass1];
if (passpiece1 != null && passpiece1.Color != m_Color && passpiece1.AllowEnPassantCapture)
{
moves.Add(p1);
}
}
}
}
if (m_BChessboard.IsValid(p2))
{
BaseChessPiece piece2 = m_BChessboard[p2];
if (piece2 != null && piece2.Color != m_Color)
{
moves.Add(p2);
}
else
{
Point2D pass2 = new Point2D(m_Position.X + 1, m_Position.Y);
if (m_BChessboard.IsValid(p2))
{
BaseChessPiece passpiece2 = m_BChessboard[pass2];
if (passpiece2 != null && passpiece2.AllowEnPassantCapture && passpiece2.Color != m_Color)
{
moves.Add(pass2);
}
}
}
}
}
return(moves);
}
/// <summary>
/// Verifies if the requested castle moved is allowed
/// </summary>
/// <param name="king">The King performing the castle</param>
/// <param name="rook">The Rook</param>
/// <param name="err">Will hold any error messages</param>
/// <returns>True if the castle move is allowed</returns>
public bool AllowCastle( BaseChessPiece king, BaseChessPiece rook, ref string err )
{
#region Castle Rules
// 1 Your king has been moved earlier in the game.
// 2 The rook that castles has been moved earlier in the game.
// 3 There are pieces standing between your king and rook.
// 4 The king is in check.
// 5 The king moves through a square that is attacked by a piece of the opponent.
// 6 The king would be in check after castling.
#endregion
if ( king.HasMoved || rook.HasMoved )
{
err = "You can't castle if the rook or king have already moved";
return false; // Rules 1 and 2
}
if ( IsCheck( king.Color ) )
{
err = "You can't castle if your king is in check";
return false; // Rule 4
}
bool queenside = rook.Position.X == 0;
if ( queenside )
{
for ( int i = 1; i < 4; i++ )
{
if ( this[ i, king.Position.Y ] != null )
{
err = "You can't castle if there are pieces between the king and the rook";
return false; // Rule 3 queenside
}
}
}
else
{
if ( this[ 5, king.Position.Y ] != null || this[ 6, king.Position.Y ] != null )
{
err = "You can't castle if there are pieces between the king and the rook";
return false; // Rule 3 kingside
}
}
// King always moves 2
int kingX = king.Position.X + ( queenside ? -2 : 2 );
int kingTransit = king.Position.X + ( queenside ? -1 : 1 );
if ( IsAttacked( new Point2D( kingTransit, king.Position.Y ), king.EnemyColor ) )
{
err = "The king cannot move through a square that is under attack by the opponent";
return false; // Rule 5
}
if ( IsAttacked( new Point2D( kingX, king.Position.Y ), king.EnemyColor ) )
{
err = "The king would be in check after the castle";
return false; // Rule 6
}
return true;
}
public override bool CanMoveTo(Point2D newLocation, ref string err)
{
if (!base.CanMoveTo(newLocation, ref err))
{
return(false);
}
// Verify if this is a castle
BaseChessPiece king = m_BChessboard[newLocation];
if (king is King && king.Color == m_Color)
{
// Trying to castle
return(m_BChessboard.AllowCastle(king, this, ref err));
}
int dx = newLocation.X - m_Position.X;
int dy = newLocation.Y - m_Position.Y;
// Rooks can only move in one direction
if (dx != 0 && dy != 0)
{
err = "Rooks can only move on straight lines";
return(false);
}
if (dx != 0)
{
// Moving on the X axis
int direction = dx > 0 ? 1 : -1;
if (Math.Abs(dx) > 1)
{
// Verify that the cells in between are empty
for (int i = 1; i < Math.Abs(dx); i++) // Start 1 tile after the rook, and stop one tile before destination
{
int offset = direction * i;
if (m_BChessboard[m_Position.X + offset, m_Position.Y] != null)
{
err = "Rooks can't move over pieces";
return(false); // There's a piece on the
}
}
}
// Verify if there's a piece to each at the end
BaseChessPiece piece = m_BChessboard[newLocation];
if (piece == null || piece.Color != m_Color)
{
return(true);
}
else
{
err = "You can't capture pieces of your same color";
return(false);
}
}
else
{
// Moving on the Y axis
int direction = dy > 0 ? 1 : -1;
if (Math.Abs(dy) > 1)
{
// Verify that the cells in between are empty
for (int i = 1; i < Math.Abs(dy); i++)
{
int offset = direction * i;
if (m_BChessboard[m_Position.X, m_Position.Y + offset] != null)
{
err = "The rook can't move over other pieces";
return(false); // Piece on the way
}
}
}
// Verify for piece at end
BaseChessPiece piece = m_BChessboard[newLocation];
if (piece == null || piece.Color != m_Color)
{
return(true);
}
else
{
err = "You can't capture pieces of your same color";
return(false);
}
}
}
/// <summary>
/// Callback for the move finalization
/// </summary>
public void OnPieceMove( Mobile from, object targeted )
{
string err = null;
if ( ! ( targeted is IPoint2D ) )
{
err = "Invalid Move";
m_MovingPiece = null;
if ( GetColor( from ) == ChessColor.Black )
SendAllGumps( null, err );
else
SendAllGumps( err, null );
return;
}
if ( ! m_Board.TryMove( ref err, m_MovingPiece, new Point2D( targeted as IPoint2D ) ) )
{
m_MovingPiece = null;
if ( GetColor( from ) == ChessColor.Black )
SendAllGumps( null, err );
else
SendAllGumps( err, null );
return;
}
// Move has been made. Wait until it's over
if ( m_Status == GameStatus.WhiteToMove )
{
m_Status = GameStatus.WhiteMoving;
SendAllGumps( "Making your move", null );
}
else
{
m_Status = GameStatus.BlackMoving;
SendAllGumps( null, "Making your move" );
}
}
public override bool CanMoveTo(Point2D newLocation, ref string err)
{
if (!base.CanMoveTo(newLocation, ref err))
{
return(false);
}
if (newLocation.X == m_Position.X)
{
// Regular move
int dy = newLocation.Y - m_Position.Y;
// Trying to move more than two pieces, or more than one piece after the first move
if (Math.Abs(dy) > 2 || (Math.Abs(dy)) > 1 && m_HasMoved)
{
err = "You can move only 1 tile at a time, or 2 if it's the pawn's first move";
return(false);
}
// Verify direction
if (m_Color == ChessColor.Black && dy < 0)
{
err = "You can't move pawns backwards";
return(false);
}
if (m_Color == ChessColor.White && dy > 0)
{
err = "You can't move pawns backwards";
return(false);
}
// Verify if there are pieces (any) on the target squares
for (int i = 1; i <= Math.Abs(dy); i++)
{
int offset = m_Color == ChessColor.Black ? i : -i;
if (m_BChessboard[m_Position.X, m_Position.Y + offset] != null)
{
err = "Pawns can't move over other pieces, and capture in diagonal";
return(false);
}
}
return(true);
}
else
{
// Trying to capture?
int dx = newLocation.X - m_Position.X;
int dy = newLocation.Y - m_Position.Y;
if (Math.Abs(dx) != 1 || Math.Abs(dy) != 1)
{
err = "Pawns move straight ahead, or capture in diagonal only";
return(false);
}
// Verify direction
if (m_Color == ChessColor.Black && dy < 0)
{
err = "You can't move pawns backwards";
return(false);
}
if (m_Color == ChessColor.White && dy > 0)
{
err = "You can't move pawns backwards";
return(false);
}
// Verify if there's a piece to capture
BaseChessPiece piece = m_BChessboard[newLocation];
if (piece != null && piece.Color != m_Color)
{
return(true);
}
else
{
// Verify for an en passant capture
Point2D passant = new Point2D(m_Position.X + dx, m_Position.Y);
BaseChessPiece target = m_BChessboard[passant];
if (target != null && target.AllowEnPassantCapture && target.Color != m_Color)
{
return(true);
}
else
{
err = "You must capture a piece when moving in diagonal";
return(false);
}
}
}
}