private Square?GetFirstMoveSquare(Board board, int moveDirection)
{
Square mySquare = board.FindPiece(this);
Square?availableMove = null;
if (!HasEverMoved && BoardQuery.IsWithinBounds(mySquare + new MoveOffset(moveDirection, 0)) &&
board.GetPiece(mySquare + new MoveOffset(moveDirection, 0)) == null)
{
availableMove = mySquare + new MoveOffset(moveDirection * 2, 0);
}
return(availableMove);
}
private List <Square> GetSquaresCanAttack(Board board, int moveDirection)
{
Square mySquare = board.FindPiece(this);
List <Square> availableMoves = new List <Square>();
for (int colOffset = -1; colOffset < 2; colOffset += 2)
{
Square captureSquare = mySquare + new MoveOffset(moveDirection, colOffset);
if (BoardQuery.IsWithinBounds(captureSquare) &&
BoardQuery.IsOppositeColourOnSquares(board, mySquare, captureSquare))
{
availableMoves.Add(captureSquare);
}
}
return(availableMoves);
}
public static IEnumerable <Square> GetValidMovesInDirection(Board board, Square startingSquare, MoveOffset direction)
{
List <Square> validMoves = new List <Square>();
int distance = 1;
while (BoardQuery.IsWithinBounds(startingSquare + (direction * distance)) && board.GetPiece(startingSquare + (direction * distance)) == null)
{
validMoves.Add(startingSquare + (direction * distance));
distance += 1;
}
if (BoardQuery.IsWithinBounds(startingSquare + (direction * distance)) &&
!BoardQuery.IsSameColourOnSquares(board, startingSquare + (direction * distance), startingSquare))
{
validMoves.Add(startingSquare + (direction * distance));
}
return(validMoves);
}
private List <Square> GetSquaresEnPassant(Board board, int moveDirection)
{
Square mySquare = board.FindPiece(this);
List <Square> availableMoves = new List <Square>();
for (int colOffset = -1; colOffset < 2; colOffset += 2)
{
Square sidewaysSquare = mySquare + new MoveOffset(0, colOffset);
if (BoardQuery.IsWithinBounds(sidewaysSquare) &&
BoardQuery.IsOppositeColourOnSquares(board, mySquare, sidewaysSquare))
{
Square previousSquare = sidewaysSquare + new MoveOffset(moveDirection * 2, 0);
if (board.PreviousBoard[previousSquare.Row, previousSquare.Col] == board.GetPiece(sidewaysSquare))
{
availableMoves.Add(sidewaysSquare + new MoveOffset(moveDirection, 0));
}
}
}
return(availableMoves);
}