Generate city picker maps from a bunch of small maps, instead of one huge map. Use for Paris. One giant map covering everything there is going to be too large.

data/MANIFEST.json

@@ -408,6 +408,10 @@
       "checksum": "69df8b1a1f93c5d52f872ef18eb5cde2",
       "size_bytes": 8485994
     },
+    "data/system/paris/city.bin": {
+      "checksum": "0fd1914ef16ad3797ccfaf14c36c3a17",
+      "size_bytes": 2279409
+    },
     "data/system/paris/maps/center.bin": {
       "checksum": "5ed145aee161a464011fb4bc16d3110a",
       "size_bytes": 37829561

data/regen.sh

@@ -8,6 +8,7 @@ rm -fv data/system/seattle/maps/huge_seattle.bin data/input/raw_maps/huge_seattl
 ./import.sh --raw --map --city=berlin
 ./import.sh --raw --map --city=krakow
 ./import.sh --raw --map --city=london
+./import.sh --raw --map --city_overview --city=paris
 ./import.sh --raw --map --city=tel_aviv
 ./import.sh --raw --map --city=xian
 

importer/src/main.rs

@@ -25,6 +25,7 @@ struct Job {
     raw_to_map: bool,
     scenario: bool,
     scenario_everyone: bool,
+    city_overview: bool,
 
     skip_ch: bool,
     keep_bldg_tags: bool,
@@ -49,6 +50,8 @@ fn main() {
         scenario: args.enabled("--scenario"),
         // Produce a variation of the weekday scenario including off-map trips.
         scenario_everyone: args.enabled("--scenario_everyone"),
+        // Produce a city overview from all of the individual maps in a city.
+        city_overview: args.enabled("--city_overview"),
         // Skip the most expensive step of --map, building contraction hierarchies. The simulation
         // will use a slower method to pathfind.
         skip_ch: args.enabled("--skip_ch"),
@@ -70,11 +73,12 @@ fn main() {
         && !job.raw_to_map
         && !job.scenario
         && !job.scenario_everyone
+        && !job.city_overview
         && job.oneshot.is_none()
     {
         println!(
             "Nothing to do! Pass some combination of --raw, --map, --scenario, \
-             --scenario_everyone or --oneshot"
+             --scenario_everyone, --city_overview, or --oneshot"
         );
         std::process::exit(1);
     }
@@ -221,6 +225,15 @@ fn main() {
             timer.stop(format!("scenario_everyone for {}", name.describe()));
         }
     }
+
+    if job.city_overview {
+        timer.start(format!("generate city overview for {}", job.city));
+        abstutil::write_binary(
+            abstutil::path(format!("system/{}/city.bin", job.city)),
+            &map_model::City::from_individual_maps(&job.city, &mut timer),
+        );
+        timer.stop(format!("generate city overview for {}", job.city));
+    }
 }
 
 fn oneshot(

importer/src/utils.rs

@@ -142,7 +142,7 @@ pub fn raw_to_map(
         timer.start("generating city manifest");
         abstutil::write_binary(
             abstutil::path(format!("system/{}/city.bin", map.get_city_name())),
-            &map_model::City::new(&map),
+            &map_model::City::from_huge_map(&map),
         );
         timer.stop("generating city manifest");
     }

map_model/src/city.rs

@@ -1,7 +1,7 @@
 use serde::{Deserialize, Serialize};
 
-use abstutil::MapName;
-use geom::{LonLat, Polygon, Ring};
+use abstutil::{MapName, Timer};
+use geom::{GPSBounds, LonLat, Polygon, Ring};
 
 use crate::{AreaType, Map};
 
@@ -12,13 +12,14 @@ pub struct City {
     pub name: String,
     pub boundary: Polygon,
     pub areas: Vec<(AreaType, Polygon)>,
-    // The individual maps
+    /// The individual maps
     pub regions: Vec<(MapName, Polygon)>,
     // TODO Move nice_map_name from game into here?
 }
 
 impl City {
-    pub fn new(huge_map: &Map) -> City {
+    /// If there's a single map covering all the smaller maps, use this.
+    pub fn from_huge_map(huge_map: &Map) -> City {
         let city_name = huge_map.get_city_name().clone();
         let mut regions = abstutil::list_dir(format!("importer/config/{}", city_name))
             .into_iter()
@@ -46,4 +47,53 @@ impl City {
             regions,
         }
     }
+
+    /// Generate a city from a bunch of smaller, individual maps. The boundaries of those maps
+    /// may overlap and may have gaps between them.
+    pub fn from_individual_maps(city_name: &str, timer: &mut Timer) -> City {
+        let boundary_per_region: Vec<(MapName, Vec<LonLat>)> =
+            abstutil::list_dir(format!("importer/config/{}", city_name))
+                .into_iter()
+                .filter(|path| path.ends_with(".poly"))
+                .map(|path| {
+                    (
+                        MapName::new(&city_name, &abstutil::basename(&path)),
+                        LonLat::read_osmosis_polygon(&path).unwrap(),
+                    )
+                })
+                .collect();
+        // Figure out the total bounds for all the maps
+        let mut gps_bounds = GPSBounds::new();
+        for (_, pts) in &boundary_per_region {
+            for pt in pts {
+                gps_bounds.update(*pt);
+            }
+        }
+        let boundary = gps_bounds.to_bounds().get_rectangle();
+
+        let mut regions = Vec::new();
+        for (name, pts) in boundary_per_region {
+            regions.push((name, Ring::must_new(gps_bounds.convert(&pts)).to_polygon()));
+        }
+
+        // Add areas from every map. It's fine if they partly overlap.
+        let mut areas = Vec::new();
+        for path in abstutil::list_dir(abstutil::path(format!("system/{}/maps", city_name))) {
+            let map = Map::new(path, timer);
+            for area in map.all_areas() {
+                let pts = map.gps_bounds.convert_back(area.polygon.points());
+                // TODO Holes in the polygons get lost
+                if let Ok(ring) = Ring::new(gps_bounds.convert(&pts)) {
+                    areas.push((area.area_type, ring.to_polygon()));
+                }
+            }
+        }
+
+        City {
+            name: city_name.to_string(),
+            boundary,
+            areas,
+            regions,
+        }
+    }
 }