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Merge pull request #3833 from alphagov/vary-bleed-by-population-density

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Vary bleed amount based on population density
This commit is contained in:
Chris Hill-Scott
2021-03-22 10:03:19 +00:00
committed by GitHub
parent 40e25721ea 57aa994ce9
commit aa2a10c843
8 changed files with 141 additions and 9 deletions
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13
app/models/broadcast_message.py
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@@ -117,6 +117,17 @@ class BroadcastMessage(JSONModel):
def simple_polygons(self):
return self.get_simple_polygons(areas=self.areas)
@cached_property
def simple_polygons_with_bleed(self):
polygons = Polygons(
list(itertools.chain(*(
area.simple_polygons_with_bleed for area in self.areas
)))
)
# If we’ve added multiple areas then we need to re-simplify the
# combined shapes to keep the point count down
return polygons.smooth.simplify if len(self.areas) > 1 else polygons
@property
def reference(self):
if self.template_id:
@@ -163,7 +174,7 @@ class BroadcastMessage(JSONModel):
@property
def count_of_phones_likely(self):
area_estimate = self.simple_polygons.estimated_area
bleed_area_estimate = self.simple_polygons.bleed.estimated_area - area_estimate
bleed_area_estimate = self.simple_polygons_with_bleed.estimated_area - area_estimate
return round_to_significant_figures(
self.count_of_phones + (self.count_of_phones * bleed_area_estimate / area_estimate),
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