public Move(Board board, Location from, Location to, CellContent oldDestinationCell)
{
this.board = board;
this.from = from;
this.to = to;
this.oldDestinationCell = oldDestinationCell;
}
public Move PerformMove(Location from, Location to)
{
Cell old = Get(to);
Set(to, Get(from));
Set(from, Cell.Empty);
return new Move(this, from, to, old);
}
private bool HasMoves(Location to, Location @from, Cell old)
{
var hasMoves = false;
board.Set(to, board.Get(@from));
board.Set(@from, Cell.Empty);
if (!IsCheck())
hasMoves = true;
board.Set(@from, board.Get(to));
board.Set(to, old);
return hasMoves;
}
private static IEnumerable<Location> MovesInOneDirection(Location from, Board board, Location dir, bool infinit)
{
CellContent fromCellContent = board.Get(from);
for (int i = 1; i < (infinit ? 8 : 2); i++)
{
var to = new Location(from.X + dir.X*i, from.Y + dir.Y*i);
if (!to.InBoard) break;
CellContent toCellContent = board.Get(to);
if (toCellContent.Piece == null) yield return to;
else
{
if (toCellContent.Color != fromCellContent.Color) yield return to;
yield break;
}
}
}
private bool IsSafeMove(Board board, Location pieceLocation, Location moveTo)
{
var oldLocation = board.Get(moveTo);
try
{
board.Set(moveTo, board.Get(pieceLocation));
board.Set(pieceLocation, CellContent.Empty);
return !WhiteKingHasCheck(board);
}
finally
{
board.Set(pieceLocation, board.Get(moveTo));
board.Set(moveTo, oldLocation);
}
}
public void Set(Location location, Cell cell)
{
cells[location.X, location.Y] = cell;
}
public Cell Get(Location location)
{
return !location.InBoard ? Cell.Empty : cells[location.X, location.Y];
}
public IEnumerable<Location> GetMoves(Location location, Board board)
{
return ds.SelectMany(d => MovesInOneDirection(location, board, d, infinit));
}