/// <summary>
/// Attack all squares through a certain direction, based on their distance from
/// <paramref name="originSquare"/>.
/// </summary>
/// <param name="originSquare">Attacker square, based on
/// <paramref name="position"/>.</param>
/// <param name="orientation">Attack orientation.</param>
/// <param name="sense">True if the attack sense follows the orientation.
/// False otherwise.</param>
/// <param name="position">A given <see cref="Board.Position"/>.</param>
/// <returns></returns>
private static IEnumerable <Move> Attack(
this Square originSquare,
Through orientation,
bool sense,
IReadOnlyDictionary <Square, IPiece> position)
{
var moves = new List <Move>();
int numberOfSquares = 1;
var move = originSquare.AttackSquare(
originSquare.Maneuver(
orientation, sense ? numberOfSquares : -numberOfSquares),
position);
while (move is not null)
{
yield return(move);
if (move.Type is MoveType.Capture)
{
yield break;
}
move = originSquare.AttackSquare(
originSquare.Maneuver(
orientation, sense ? (numberOfSquares += 1) : -(numberOfSquares += 1)),
position);
}
}
/// <summary>
/// Attack all squares through a certain direction.
/// </summary>
/// <param name="piece">Attacking <see cref="Piece"/>.</param>
/// <param name="orientation">Attack orientation.</param>
/// <param name="position">A given <see cref="Board.Position"/>.</param>
/// <param name="sense">True if the attack sense follows the orientation.
/// False otherwise.</param>
/// <param name="range">The range of the attack. Indicates how deep the attack is
/// relative to <see cref="Piece.GetSquareFrom(IReadOnlyDictionary{Square, IPiece})"/>.</param>
/// <returns>A read-only <see cref="Move"/> collection.</returns>
public static IReadOnlyCollection <Move> Attack(
this Piece piece,
Through orientation,
bool sense,
IReadOnlyDictionary <Square, IPiece> position,
uint range = 7)
{
var square = piece.GetSquareFrom(position);
return((square is null) ?
new List <Move>() :
square
.Attack(orientation, sense, position)
.Take((int)range)
.ToList());
}
/// <summary>
/// Returns the destination <see cref="Square"/> by moving a certain <paramref name="numberOfSquares"/>
/// through an <paramref name="orientation"/> from origin <paramref name="square"/>.
/// </summary>
/// <param name="square">Origin square.</param>
/// <param name="orientation">The move orientation.</param>
/// <param name="numberOfSquares">Number of squares. A negative number indicates a change in sense.</param>
/// <returns></returns>
public static Square Maneuver(
this Square square,
Through orientation,
int numberOfSquares)
=> orientation switch
{
