public virtual IEnumerable<Board> PossibleMoves(Board currentBoard, byte row, byte col)
{
var currentLoc = new Loc(row, col);
foreach (var loc in TilesCovered(currentBoard, row, col))
{
if (!currentBoard.IsOccupied(loc, IsWhite))
yield return currentBoard.WithNewLocation(currentLoc, loc);
}
}
public override IEnumerable<Loc> TilesCovered(Board currentBoard, byte row, byte col)
{
var direction = -1;
if (IsWhite) direction = 1;
if (row + direction < 0 || row + direction > 7)
yield break;
if (col < 7)
yield return new Loc(row + direction, col + 1);
if (col > 0)
yield return new Loc(row + direction, col - 1);
}
public override IEnumerable<Board> PossibleMoves(Board currentBoard, byte row, byte col)
{
var currentLoc = new Loc(row, col);
var boards = new List<Board>();
foreach (var loc in TilesCovered(currentBoard, row, col))
{
if (!currentBoard.IsCovered(IsWhite, loc))
{
boards.Add(currentBoard.WithNewLocation(currentLoc, loc));
}
}
return boards;
}
public override IEnumerable<Board> PossibleMoves(Board currentBoard, byte row, byte col)
{
var direction = -1;
if (IsWhite) direction = 1;
if (row + direction < 0 || row + direction > 7)
yield break;
var newLoc = new Loc(row + direction, col);
var currentLoc = new Loc(row, col);
if (!currentBoard.IsOccupied(newLoc))
{
yield return currentBoard.WithNewLocation(currentLoc, newLoc);
}
}
public override IEnumerable<Loc> TilesCovered(Board currentBoard, byte row, byte col)
{
for (sbyte i = -1; i < 2; i++)
{
for (sbyte j = -1; j < 2; j++)
{
if (row + i < 0 || row + i > 7) continue;
if (col + j < 0 || col + j > 7) continue;
var loc = new Loc((byte)(row + i), (byte)(col + j));
if (!currentBoard.IsOccupied(loc, IsWhite))
{
yield return loc;
}
}
}
}
public static IEnumerable<Loc> _TilesCovered(Board currentBoard, byte row, byte col)
{
var covered = new List<Loc>();
for (int i = 1; i < 8; i++)
{
var loc = new Loc(row + i, col);
if (!Board.InsideBoard(loc)) break;
covered.Add(loc);
if (currentBoard.IsOccupied(loc)) break;
}
for (int i = 1; i < 8; i++)
{
var loc = new Loc(row - i, col);
if (!Board.InsideBoard(loc)) break;
covered.Add(loc);
if (currentBoard.IsOccupied(loc)) break;
}
for (int i = 1; i < 8; i++)
{
var loc = new Loc(row, col + i);
if (!Board.InsideBoard(loc)) break;
covered.Add(loc);
if (currentBoard.IsOccupied(loc)) break;
}
for (int i = 1; i < 8; i++)
{
var loc = new Loc(row, col - i);
if (!Board.InsideBoard(loc)) break;
covered.Add(loc);
if (currentBoard.IsOccupied(loc)) break;
}
return covered;
}
public override IEnumerable<Loc> TilesCovered(Board currentBoard, byte row, byte col) => _TilesCovered(currentBoard, row, col);
public abstract IEnumerable<Loc> TilesCovered(Board currentBoard, byte row, byte col);
public override IEnumerable<Loc> TilesCovered(Board currentBoard, byte row, byte col)
=> Rook._TilesCovered(currentBoard, row, col).Union(Bishop._TilesCovered(currentBoard, row, col));
public override IEnumerable<Loc> TilesCovered(Board currentBoard, byte row, byte col)
{
var locs = new[]
{
new Loc(row + 2, col + 1),
new Loc(row + 2, col - 1),
new Loc(row - 2, col + 1),
new Loc(row - 2, col - 1),
new Loc(row + 1, col + 2),
new Loc(row + 1, col - 2),
new Loc(row - 1, col + 2),
new Loc(row - 1, col - 2),
};
foreach (var loc in locs)
{
if (Board.InsideBoard(loc))
{
yield return loc;
}
}
}