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scale num_residents for polygons near the map boundary, for #119

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This commit is contained in:
Dustin Carlino 2020-07-22 13:24:56 -07:00
parent 5d2b770258
commit 4fb7e008c0
1 changed files with 12 additions and 5 deletions
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17
importer/src/berlin.rs
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@ -131,12 +131,21 @@ pub fn distribute_residents(map: &mut map_model::Map, timer: &mut Timer) {
.filter(|b| region.contains_pt(b.label_center) && b.bldg_type.has_residents())
.map(|b| b.id)
.collect();
let num_residents = shape.attributes["num_residents"].parse::<usize>().unwrap();
let orig_num_residents = shape.attributes["num_residents"].parse::<f64>().unwrap();
// If the region is partly out-of-bounds, then scale down the number of residents linearly
// based on area of the overlapping part of the polygon.
let pct_overlap = Polygon::union_all(region.intersection(map.get_boundary_polygon()))
.area()
/ region.area();
let num_residents = (pct_overlap * orig_num_residents) as usize;
timer.note(format!(
"Distributing {} residents in {} to {} buildings",
"Distributing {} residents in {} to {} buildings. {}% of this area overlapped with \
the map, scaled residents accordingly.",
prettyprint_usize(num_residents),
shape.attributes["spatial_alias"],
prettyprint_usize(bldgs.len())
prettyprint_usize(bldgs.len()),
(pct_overlap * 100.0) as usize
));
// Deterministically seed using the planning area's ID.
@ -146,8 +155,6 @@ pub fn distribute_residents(map: &mut map_model::Map, timer: &mut Timer) {
// How do you randomly distribute num_residents into some buildings?
// https://stackoverflow.com/questions/2640053/getting-n-random-numbers-whose-sum-is-m
// TODO Problems:
// - If the region is partly out-of-bounds, then the full number of residents is matched to
// a small set of buildings.
// - Because of how we round, the sum might not exactly be num_residents
// - This is not a uniform distribution, per stackoverflow
// - Larger buildings should get more people