// This utility function will move a piece from the selected square to the target square.
// It will return any chess piece that was captured from the target square.
public AbstractChessPiece MoveChessPiece(ChessSquare selectedSquare, ChessSquare clickedSquare)
{
// save any piece that is on the target square
AbstractChessPiece capturedPiece = clickedSquare.ChessPiece;
// move the piece from the original square to the target square
clickedSquare.SetChessPiece(selectedSquare.ChessPiece);
// mark the chess piece as having been moved, in case the piece needs to know (e.g. Pawn)
selectedSquare.ChessPiece.HasMoved = true;
// remove the chess piece from the original square
selectedSquare.RemoveChessPiece();
// Unselect the currently selected square
selectedSquare.Unselect();
// return the captured piece, if any (or null if no piece was captured)
return(capturedPiece);
}
// This utility function will look at a proposed move from the selectedSquare to
// the clickedSquare and determine if the specified player would be in check after
// the move. The actual gameboard itself is left unchanged.
public bool TestMoveForCheck(PlayerType currentPlayer, ChessSquare selectedSquare, ChessSquare clickedSquare)
{
// save the piece that may be on the target square
AbstractChessPiece capturedPiece = clickedSquare.ChessPiece;
// temporarily put the original piece on the target square
clickedSquare.SetChessPiece(selectedSquare.ChessPiece);
// temporarily remove the original piece from the original square
selectedSquare.RemoveChessPiece();
// see if the specified player is in check
bool isInCheck = IsInCheck(currentPlayer);
// restore the moved piece to the original square
selectedSquare.SetChessPiece(clickedSquare.ChessPiece);
// restore the original contents of the target square
clickedSquare.SetChessPiece(capturedPiece);
// return true if the current player would still be in check, or false otherwise
return(isInCheck);
}
