///<summary>
/// Return the nth neighbor in the given direction. We've
/// already counted the neighbors, so there should be no
/// case of a null neighbor.
///</summary>
internal GridCell NthNeighbor(GridCell cell, GridDirection direction, int n)
{
GridCell temp = NthNeighborOrNull(cell, direction, n);
if (temp == null)
throw new Exception(string.Format("Null neighbor in PathGenerator.NthNeighbor({0}, {1}, {2})",
cell.ToString(), (int)direction, n));
return temp;
}
