public void AddCell(ulong x, ulong y, bool state)
{
// outside grid, return
// TODO: throw ex
if (x >= Rows || y >= Cols) return;
Tuple<ulong, ulong> loc = new Tuple<ulong, ulong>(x, y);
if (!Cells.ContainsKey(loc))
{
Cell cell = new Cell(x, y);
cell.State = state;
Cells.Add(loc, cell);
}
}
private Cell GetNeighbor(Compass dir, ulong x, ulong y)
{
ulong row = x;
ulong col = y;
// TODO: handle overflow, underflow, and off grid
switch (dir)
{
case Compass.North:
if (row >= Rows || row == ulong.MaxValue) return null;
row++;
break;
case Compass.Northeast:
if (row >= Rows || row == ulong.MaxValue || col >= Cols || col == ulong.MaxValue) return null;
row++;
col++;
break;
case Compass.East:
if (col >= Cols || col == ulong.MaxValue) return null;
col++;
break;
case Compass.Southeast:
if (row == 0 || col >= Cols || col == ulong.MaxValue) return null;
row--;
col++;
break;
case Compass.South:
if (row == 0) return null;
row--;
break;
case Compass.Southwest:
if (row == 0 || col == 0) return null;
row--;
col--;
break;
case Compass.West:
if (col == 0) return null;
col--;
break;
case Compass.Northwest:
if (row >= Rows || row == ulong.MaxValue || col == 0) return null;
row++;
col--;
break;
}
Cell cell = GetCell(row, col);
if (cell == null) cell = new Cell(row, col);
return cell;
}