/// <summary>
/// Moves the piece from startPosition to endPosition. Kills the piece at endPosition if it exists.
/// </summary>
/// <param name="startPosition"></param>
/// <param name="endPosition"></param>
public void MovePiece(Position startPosition, Position endPosition)
{
MoveSpecification move = new MoveSpecification(startPosition, endPosition);
// Kill the piece at the destination, if there is one
var endPiece = internalPieceAt(endPosition);
if (endPiece != null)
{
#if DEBUG
changeTurn();
System.Diagnostics.Debug.WriteLine("num in captured before capture on captured team " + WhoseTurn + " is " + capturedPiecesByTeam[WhoseTurn].Count);
if (capturedPiecesByTeam[WhoseTurn].Count > 0)
{
System.Diagnostics.Debug.WriteLine("piece at count - 1 before this capture: " + capturedPiecesByTeam[WhoseTurn][capturedPiecesByTeam[WhoseTurn].Count - 1].ToShortString());
}
foreach (var piece in capturedPiecesByTeam[WhoseTurn])
{
System.Diagnostics.Debug.Write(piece.ToShortString() + ", ");
}
System.Diagnostics.Debug.WriteLine("are the pieces captured for " + WhoseTurn);
changeTurn();
#endif
move.Capture = endPosition;
capturedPiecesByTeam[endPiece.Team].Add(endPiece);
// Remove a killed piece from our valid pieceLocationsByType list
var listOfEndPieceType = pieceLocationsByType[endPiece.Type];
listOfEndPieceType.Remove(new Point2D(endPosition));
#if DEBUG
changeTurn();
System.Diagnostics.Debug.WriteLine("num in captured after capture on captured team " + WhoseTurn + " is " + capturedPiecesByTeam[WhoseTurn].Count);
System.Diagnostics.Debug.WriteLine("piece at count - 1 after this capture: " + capturedPiecesByTeam[WhoseTurn][capturedPiecesByTeam[WhoseTurn].Count - 1].ToShortString());
foreach (var piece in capturedPiecesByTeam[WhoseTurn])
{
System.Diagnostics.Debug.Write(piece.ToShortString() + ", ");
}
System.Diagnostics.Debug.WriteLine("are the pieces captured for " + WhoseTurn);
changeTurn();
#endif
} //TODO: else if en passant
var movingPiece = internalPieceAt(startPosition);
//Move the moving piece in boardMatrix
SetPieceAt(endPosition, movingPiece);
SetPieceAtToNull(startPosition);
if (!movingPiece.HasMoved) //note changes if this is a piece's first move in it and in pastMoves
{
movingPiece.HasMoved = true;
move.HasMovedChange = true;
}
// Replace the old position for this piece with the new position in the pieceLocationsByType list
var listOfMovingPieceType = pieceLocationsByType[movingPiece.Type];
listOfMovingPieceType.Remove(new Point2D(startPosition));
listOfMovingPieceType.Add(new Point2D(endPosition));
pastMoves.Add(move);
changeTurn();
}
//undoes castle moves
private void undoCastle(MoveSpecification lastMove)
{
int rookSideDir = Math.Sign(lastMove.Start.Column - KingCol); //calculates the direction of the rook from the king initially
//Move King back in BoardMatrix
Position movedKingPos = new Position(KingCol + 2 * rookSideDir, lastMove.Start.Row);
var king = internalPieceAt(movedKingPos);
Position unMovedKingPos = new Position(KingCol, lastMove.Start.Row);
SetPieceAt(unMovedKingPos, king);
SetPieceAtToNull(movedKingPos);
king.HasMoved = false; //set King HasMoved to false
//Update King Location in pieceLocationsByType
var listOfPieceType = pieceLocationsByType[PieceType.King];
listOfPieceType.Remove(movedKingPos);
listOfPieceType.Add(unMovedKingPos);
//Move Rook back
var rook = internalPieceAt(lastMove.End);
SetPieceAt(new Point2D(lastMove.Start), rook);
SetPieceAtToNull(new Point2D(lastMove.End));
rook.HasMoved = false; //set Rook HasMoved to false
//Update Rook Location in pieceLocationsByType
listOfPieceType = pieceLocationsByType[PieceType.Rook];
listOfPieceType.Remove(new Point2D(lastMove.End));
listOfPieceType.Add(new Point2D(lastMove.Start));
}
//undoes non-castle moves
private void undoRegularMove(MoveSpecification lastMove)
{
var movingPiece = internalPieceAt(lastMove.End); //get the move that is being undone
if (lastMove.HasMovedChange) //set a piece to unmoved if this was a move that changed that status
{
movingPiece.HasMoved = false;
}
//Perform reverse move upon boardMatrix
SetPieceAt(lastMove.Start, internalPieceAt(lastMove.End));
SetPieceAtToNull(lastMove.End);
//Replace the old position for this piece with the new position in the pieceLocationsByType list
var listOfMovingPieceType = pieceLocationsByType[internalPieceAt(lastMove.Start).Type];
listOfMovingPieceType.Remove(lastMove.End);
listOfMovingPieceType.Add(lastMove.Start);
if (lastMove.Capture != null) //if move being undone has a capture location, restore the most recently taken other team's piece to that location
{
#if DEBUG
System.Diagnostics.Debug.WriteLine("num in captured before restore for " + WhoseTurn + " is " + capturedPiecesByTeam[WhoseTurn].Count);
System.Diagnostics.Debug.WriteLine("restored captured piece: " + capturedPiecesByTeam[WhoseTurn][capturedPiecesByTeam[WhoseTurn].Count - 1].ToShortString());
foreach (var piece in capturedPiecesByTeam[WhoseTurn])
{
System.Diagnostics.Debug.Write(piece.ToShortString() + ", ");
}
System.Diagnostics.Debug.WriteLine("are the pieces captured for " + WhoseTurn);
#endif
SetPieceAt((Position)lastMove.Capture, capturedPiecesByTeam[WhoseTurn][capturedPiecesByTeam[WhoseTurn].Count - 1]); //restores captured piece to boardMatrix
#if DEBUG
System.Diagnostics.Debug.WriteLine("num in captured mid restore for " + WhoseTurn + " is " + capturedPiecesByTeam[WhoseTurn].Count);
System.Diagnostics.Debug.WriteLine("piece being restored is " + capturedPiecesByTeam[WhoseTurn][capturedPiecesByTeam[WhoseTurn].Count - 1]);
System.Diagnostics.Debug.Write(ToString());
#endif
capturedPiecesByTeam[WhoseTurn].RemoveAt(capturedPiecesByTeam[WhoseTurn].Count - 1); //removes restored captured piece from the list of capturedPiecesByTeam for WhoseTurn, which hasn't been changed yet
// Add a captured piece to our valid pieceLocationsByType list
var listOfCapturedPieceType = pieceLocationsByType[internalPieceAt((Position)lastMove.Capture).Type];
listOfCapturedPieceType.Add((Position)lastMove.Capture);
#if DEBUG
System.Diagnostics.Debug.WriteLine("num in captured after restore for " + WhoseTurn + " is " + capturedPiecesByTeam[WhoseTurn].Count);
if (capturedPiecesByTeam[WhoseTurn].Count > 0)
{
System.Diagnostics.Debug.WriteLine("piece at count - 1: " + capturedPiecesByTeam[WhoseTurn][capturedPiecesByTeam[WhoseTurn].Count - 1].ToShortString());
}
foreach (var piece in capturedPiecesByTeam[WhoseTurn])
{
System.Diagnostics.Debug.Write(piece.ToShortString() + ", ");
}
System.Diagnostics.Debug.WriteLine("are the pieces captured for " + WhoseTurn);
#endif
}
}
//undoes the last move (can be called repeatedly)
public void UndoMove()
{
MoveSpecification lastMove = pastMoves[pastMoves.Count - 1];
if (lastMove.Castle)
{
undoCastle(lastMove);
}
else //not a castle
{
undoRegularMove(lastMove);
}
pastMoves.RemoveAt(pastMoves.Count - 1);
changeTurn();
}
public void Castle(Point2D initialRookPoint)
{
int rookDir = Math.Sign(initialRookPoint.X - KingCol); //calculates the direction of the rook from the king initially
//Move the King in boardMatrix
Position initialKingPos = new Position(KingCol, initialRookPoint.Y);
var king = internalPieceAt(initialKingPos);
Position finalKingPos = new Position(KingCol + 2 * rookDir, initialRookPoint.Y);
SetPieceAt(finalKingPos, king);
SetPieceAtToNull(initialKingPos);
king.HasMoved = true; //update King's HasMoved
//Replace the old position for the King with the new position in the pieceLocationsByType list
var listOfPieceType = pieceLocationsByType[PieceType.King];
listOfPieceType.Remove(new Point2D(initialKingPos));
listOfPieceType.Add(new Point2D(finalKingPos));
//Move this Rook in boardMatrix
var rook = internalPieceAt(initialRookPoint);
Position finalRookPos = new Position(KingCol + rookDir, initialRookPoint.Y);
SetPieceAt(finalRookPos, rook);
SetPieceAtToNull(initialRookPoint);
rook.HasMoved = true; //update Rook's HasMoved
//Replace the old position for this Rook with the new position in the pieceLocationsByType list
listOfPieceType = pieceLocationsByType[PieceType.Rook];
listOfPieceType.Remove(initialRookPoint);
listOfPieceType.Add(new Point2D(finalRookPos)); //TODO: figure out if this creation is unnecessary and casting is done automatically.
MoveSpecification move = new MoveSpecification(new Position(initialRookPoint), finalRookPos, null, true, true);
pastMoves.Add(move);
changeTurn();
}
