private Board(Board prevBoard, Figure newFigure, Point newFigurePlacementPoint)
{
if (!prevBoard.IsValidPlacement(newFigure, newFigurePlacementPoint))
{
throw new ArgumentException("Invalid or impossible placement");
}
var newPlacement = new Placement(newFigure, newFigurePlacementPoint, prevBoard.Figures.Count + 1);
var figures = new List <Placement>(prevBoard.Figures)
{
newPlacement
};
Figures = figures;
OddCellsColor = prevBoard.OddCellsColor ?? CalcOddCellsColor();
PointsMap = new BitArray(prevBoard.PointsMap);
foreach (var point in newPlacement.GetCellPoints())
{
PointsMap.Set(GetPointMapIndex(point), true);
}
}