/// <summary>
/// Create input and output grids by using rows and column count and initialize reachable cells.
/// Reachable Cells are cells which can be traversed from inner grid cells or outer grid cells i.e. virtual cells used for expanding grid
/// </summary>
/// <param name="rows"></param>
/// <param name="columns"></param>
public Game(int rows, int columns)
{
if (rows <= 0 || columns <= 0)
{
throw new ArgumentOutOfRangeException("Row and Column size must be greater than zero");
}
_inputGrid = new Grid(rows, columns);
_outputGrid = new Grid(rows, columns);
ReachableCell.InitializeReachableCells();
}
/// <summary>
/// Count live adjacent cells for specified cell co-ordinates
/// </summary>
/// <param name="grid"></param>
/// <param name="coOrdinates"></param>
/// <returns>returns number of live neighbours</returns>
private static int CountAliveNeighbours(Grid grid, CoOrdinates coOrdinates)
{
int liveNeighbours = 0;
// Get the Cell type of current cell
CellTypeEnum enumInnerCell = ReachableCell.GetCellType(grid, coOrdinates);
List <CoOrdinates> reachableCells = new List <CoOrdinates>();
// populate reachable cells from current cell for easier traversing
ReachableCell.ReachableCells.TryGetValue(enumInnerCell, out reachableCells);
if (reachableCells.Count == 0)
{
throw new ArgumentNullException("Cannot find reachable co-ordinates");
}
foreach (CoOrdinates coOrds in reachableCells)
{
liveNeighbours += IsAliveNeighbour(grid, coOrdinates, coOrds);
}
return(liveNeighbours);
}
