private static IEnumerable <int> GetWhiteLanceMoves(int index)
{
while (Board.IsInBoard(++index))
{
yield return(index);
}
}
private static IEnumerable <int> GetBlackLanceMoves(int index)
{
while (Board.IsInBoard(--index))
{
yield return(index);
}
}
// 現在の局面で、与えられたマス・手番に対して、縦横斜めの遠方へ移動可能な全マスを返す
private static IEnumerable <int> GetMovableRange(int index, Color color, Board board)
{
foreach (int direction in new int[] { -11, -10, -9, -1, 1, 9, 10, 11 })
{
int i = index + direction;
while (Board.IsInBoard(i))
{
if (board[i] != Piece.Empty)
{
// 自分の駒ならそれ以上先に進めない
if (board[i].ToColor() == color)
{
break;
}
// 敵の駒なら駒を取ってその地点まで進める
if (board[i].ToColor() != color)
{
yield return(i);
break;
}
}
yield return(i);
i += direction;
}
}
}
// 非合法手を含めた移動可能なすべてのマスを返す。
public static IEnumerable <int> GetMovableIndexes(Piece p, int index)
{
foreach (int candidate in _movableIndexesFactories[p](index))
{
if (Board.IsInBoard(candidate))
{
yield return(candidate);
}
}
}
private static IEnumerable <int> GetRookMoves(int index)
{
foreach (int direction in new int[] { -10, -1, 1, 10 })
{
int pos = index + direction;
while (Board.IsInBoard(pos))
{
yield return(pos);
pos += direction;
}
}
}
private static IEnumerable <int> GetBishopMoves(int index)
{
foreach (int direction in new int[] { -11, -9, 9, 11 })
{
int pos = index + direction;
while (Board.IsInBoard(pos))
{
yield return(pos);
pos += direction;
}
}
}
