area area_within_range(grid_node x, int r = threat)
{
area target_area = new area();
target_area.pos_in_area = new List <grid_node>();
target_area.pos_in_area.Add(x);
for (int i = 0; i < r; i++)
{
int num = target_area.pos_in_area.Count;
for (int index = 0; index < num; index++)
{
foreach (grid_node nb in sg.pure_neighbour(target_area.pos_in_area[index]))
{
if (!target_area.pos_in_area.Contains(nb))
{
target_area.pos_in_area.Add(nb);
}
}
}
}
return(target_area);
}