def _generate_locations(distance: float, geofence_helper: GeofenceHelper):
south, east, north, west = geofence_helper.get_polygon_from_fence()
corners = [
Location(south, east),
Location(south, west),
Location(north, east),
Location(north, west)
]
# get the center
center = get_middle_of_coord_list(corners)
# get the farthest to the center...
farthest_dist = 0
for corner in corners:
dist_temp = get_distance_of_two_points_in_meters(
center.lat, center.lng, corner.lat, corner.lng)
if dist_temp > farthest_dist:
farthest_dist = dist_temp
# calculate step_limit, round up to reduce risk of losing stuff
step_limit = math.ceil(farthest_dist / distance)
# This will loop thorugh all the rings in the hex from the centre
# moving outwards
logger.info("Calculating positions for init scan")
num_cores = multiprocessing.cpu_count()
with multiprocessing.Pool(processes=num_cores) as pool:
temp = [pool.apply(S2Helper._generate_star_locs, args=(
center, distance, i)) for i in range(1, step_limit)]
results = [item for sublist in temp for item in sublist]
results.append(Location(center.lat, center.lng))
logger.info("Filtering positions for init scan")
# Geofence results.
if geofence_helper is not None and geofence_helper.is_enabled():
results = geofence_helper.get_geofenced_coordinates(results)
if not results:
logger.error('No cells regarded as valid for desired scan area. Check your provided geofences. '
'Aborting.')
else:
logger.info("Ordering location")
results = S2Helper.order_location_list_rows(results)
return results
def _generate_locations(distance: float, geofence_helper: GeofenceHelper):
south, east, north, west = geofence_helper.get_polygon_from_fence()
corners = [
Location(south, east),
Location(south, west),
Location(north, east),
Location(north, west)
]
# get the center
center = get_middle_of_coord_list(corners)
# get the farthest to the center...
farthest_dist = 0
for corner in corners:
dist_temp = get_distance_of_two_points_in_meters(
center.lat, center.lng, corner.lat, corner.lng)
if dist_temp > farthest_dist:
farthest_dist = dist_temp
# calculate step_limit, round up to reduce risk of losing stuff
step_limit = math.ceil(farthest_dist / distance)
# This will loop thorugh all the rings in the hex from the centre
# moving outwards
logger.info("Calculating positions for init scan")
num_cores = multiprocessing.cpu_count()
with multiprocessing.Pool(processes=num_cores) as pool:
temp = [
pool.apply(S2Helper._generate_star_locs,
args=(center, distance, i))
for i in range(1, step_limit)
]
results = [item for sublist in temp for item in sublist]
results.append(Location(center.lat, center.lng))
# for ring in range(1, step_limit):
# for i in range(0, 6):
# # Star_locs will contain the locations of the 6 vertices of
# # the current ring (90,150,210,270,330 and 30 degrees from
# # origin) to form a star
# star_loc = S2Helper.get_new_coords(center, distance * ring,
# 90 + 60 * i)
# for j in range(0, ring):
# # Then from each point on the star, create locations
# # towards the next point of star along the edge of the
# # current ring
# loc = S2Helper.get_new_coords(star_loc, distance * j, 210 + 60 * i)
# results.append(loc)
logger.info("Filtering positions for init scan")
# Geofence results.
if geofence_helper is not None and geofence_helper.is_enabled():
results = geofence_helper.get_geofenced_coordinates(results)
if not results:
logger.error(
'No cells regarded as valid for desired scan area. '
'Check your provided geofences. Aborting.')
else:
logger.info("Ordering location")
results = S2Helper.order_location_list_rows(results)
return results
