public Board WithNewLocation(Loc loc, Loc newLoc)
{
var newPices = Pieces.ToDictionary(i => i.Key, i => i.Value);
newPices[newLoc] = newPices[loc];
newPices.Remove(loc);
return new Board(newPices);
}
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<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 string ToString()
{
var sb = new StringBuilder();
for (byte row = 0; row < 8; row++)
{
sb.Append(row + " ");
for (byte col = 0; col < 8; col++)
{
var loc = new Loc(row, col);
if (Pieces.ContainsKey(loc))
sb.Append(GetName(Pieces[loc].Type) + " ");
else
sb.Append(" ");
}
sb.AppendLine();
}
return sb.ToString();
}
public bool IsCovered(bool white, Loc loc) => CoveredTiles(white).Contains(loc);
public static bool InsideBoard(Loc location) =>
location.Row >= 0 && location.Row <= 7 &&
location.Col >= 0 && location.Col <= 7;
public bool IsOccupied(Loc loc, bool white) =>
Pieces.ContainsKey(loc) ? Pieces[loc].IsWhite == white : false;
public bool IsOccupied(Loc loc) => IsOccupied(loc, true) || IsOccupied(loc, false);
