making a general helper for finding closest stuff... using it to match extra shapes to road center lines

editor/src/render/extra_shape.rs

@@ -2,6 +2,7 @@ use dimensioned::si;
 use ezgui::{Color, GfxCtx};
 use geom::{Bounds, Circle, GPSBounds, PolyLine, Polygon, Pt2D};
 use kml::ExtraShape;
+use map_model::{FindClosest, RoadID};
 use objects::{Ctx, ID};
 use render::{RenderOptions, Renderable, EXTRA_SHAPE_POINT_RADIUS, EXTRA_SHAPE_THICKNESS};
 use std::collections::BTreeMap;
@@ -27,37 +28,49 @@ pub struct DrawExtraShape {
     pub id: ExtraShapeID,
     shape: Shape,
     pub attributes: BTreeMap<String, String>,
+    road: Option<RoadID>,
 }
 
 impl DrawExtraShape {
-    pub fn new(id: ExtraShapeID, s: ExtraShape, gps_bounds: &GPSBounds) -> Option<DrawExtraShape> {
-        Some(DrawExtraShape {
-            id: id,
-            shape: if s.points.len() == 1 {
-                Shape::Circle(Circle::new(
-                    Pt2D::from_gps(s.points[0], gps_bounds)?,
-                    EXTRA_SHAPE_POINT_RADIUS,
-                ))
-            } else {
-                let width = get_sidewalk_width(&s.attributes)
-                    .unwrap_or(EXTRA_SHAPE_THICKNESS * si::M)
-                    .value_unsafe;
+    pub fn new(
+        id: ExtraShapeID,
+        s: ExtraShape,
+        gps_bounds: &GPSBounds,
+        closest: &FindClosest<RoadID>,
+    ) -> Option<DrawExtraShape> {
         let mut pts: Vec<Pt2D> = Vec::new();
         for pt in s.points.into_iter() {
             pts.push(Pt2D::from_gps(pt, gps_bounds)?);
         }
-                if let Some(p) = PolyLine::new(pts).make_polygons(width) {
-                    Shape::Polygon(p)
+
+        if pts.len() == 1 {
+            Some(DrawExtraShape {
+                id,
+                shape: Shape::Circle(Circle::new(pts[0], EXTRA_SHAPE_POINT_RADIUS)),
+                attributes: s.attributes,
+                road: None,
+            })
+        } else {
+            let width = get_sidewalk_width(&s.attributes)
+                .unwrap_or(EXTRA_SHAPE_THICKNESS * si::M)
+                .value_unsafe;
+            let pl = PolyLine::new(pts);
+            let road = closest.match_pts(&pl);
+            if let Some(p) = pl.make_polygons(width) {
+                Some(DrawExtraShape {
+                    id,
+                    shape: Shape::Polygon(p),
+                    attributes: s.attributes,
+                    road,
+                })
             } else {
                 warn!(
                     "Discarding ExtraShape because its geometry was broken: {:?}",
                     s.attributes
                 );
-                    return None;
+                None
+            }
         }
-            },
-            attributes: s.attributes,
-        })
     }
 
     pub fn center(&self) -> Pt2D {

editor/src/render/map.rs

@@ -6,7 +6,8 @@ use control::ControlMap;
 use geom::{Bounds, Pt2D};
 use kml::ExtraShape;
 use map_model::{
-    AreaID, BuildingID, BusStopID, IntersectionID, Lane, LaneID, Map, ParcelID, Turn, TurnID,
+    AreaID, BuildingID, BusStopID, FindClosest, IntersectionID, Lane, LaneID, Map, ParcelID,
+    RoadID, Turn, TurnID,
 };
 use objects::ID;
 use plugins::hider::Hider;
@@ -83,14 +84,25 @@ impl DrawMap {
             .map(|p| DrawParcel::new(p))
             .collect();
 
-        let gps_bounds = map.get_gps_bounds();
         let mut extra_shapes: Vec<DrawExtraShape> = Vec::new();
+        if !raw_extra_shapes.is_empty() {
+            // Match shapes with the nearest road
+            let mut closest: FindClosest<RoadID> = map_model::FindClosest::new(&map.get_bounds());
+            // TODO double each road into two sides...
+            for r in map.all_roads().iter() {
+                closest.add(r.id, &r.center_pts);
+            }
+
+            let gps_bounds = map.get_gps_bounds();
             for s in raw_extra_shapes.into_iter() {
-            if let Some(es) = DrawExtraShape::new(ExtraShapeID(extra_shapes.len()), s, &gps_bounds)
+                if let Some(es) =
+                    DrawExtraShape::new(ExtraShapeID(extra_shapes.len()), s, &gps_bounds, &closest)
                 {
                     extra_shapes.push(es);
                 }
             }
+        }
+
         let mut bus_stops: HashMap<BusStopID, DrawBusStop> = HashMap::new();
         for s in map.all_bus_stops().values() {
             bus_stops.insert(s.id, DrawBusStop::new(s, map));

map_model/src/find_closest.rs

@@ -0,0 +1,53 @@
+use aabb_quadtree::QuadTree;
+use geo;
+use geo::prelude::EuclideanDistance;
+use geom::{Bounds, PolyLine};
+use ordered_float::NotNaN;
+use std::collections::HashMap;
+
+// TODO Refactor and generalize all of this...
+
+pub struct FindClosest<K> {
+    // TODO maybe any type of geo:: thing
+    geometries: HashMap<K, geo::LineString<f64>>,
+    quadtree: QuadTree<K>,
+}
+
+impl<K> FindClosest<K>
+where
+    K: Clone + std::cmp::Eq + std::hash::Hash + std::fmt::Debug,
+{
+    pub fn new(bounds: &Bounds) -> FindClosest<K> {
+        FindClosest {
+            geometries: HashMap::new(),
+            quadtree: QuadTree::default(bounds.as_bbox()),
+        }
+    }
+
+    pub fn add(&mut self, key: K, pts: &PolyLine) {
+        self.geometries.insert(key.clone(), pts_to_line_string(pts));
+        self.quadtree
+            .insert_with_box(key, pts.get_bounds().as_bbox());
+    }
+
+    pub fn match_pts(&self, pts: &PolyLine) -> Option<K> {
+        let query_geom = pts_to_line_string(pts);
+        let query_bbox = pts.get_bounds().as_bbox();
+
+        self.quadtree
+            .query(query_bbox)
+            .into_iter()
+            .min_by_key(|(key, _, _)| {
+                NotNaN::new(query_geom.euclidean_distance(&self.geometries[key])).unwrap()
+            }).map(|(key, _, _)| key.clone())
+    }
+}
+
+fn pts_to_line_string(pts: &PolyLine) -> geo::LineString<f64> {
+    let pts: Vec<geo::Point<f64>> = pts
+        .points()
+        .iter()
+        .map(|pt| geo::Point::new(pt.x(), pt.y()))
+        .collect();
+    pts.into()
+}

map_model/src/lib.rs

@@ -21,6 +21,7 @@ mod area;
 mod building;
 mod bus_stop;
 mod edits;
+mod find_closest;
 mod intersection;
 mod lane;
 mod make;
@@ -37,6 +38,7 @@ pub use area::{Area, AreaID, AreaType};
 pub use building::{Building, BuildingID, FrontPath};
 pub use bus_stop::{BusRoute, BusStop, BusStopID};
 pub use edits::{EditReason, RoadEdits};
+pub use find_closest::FindClosest;
 pub use intersection::{Intersection, IntersectionID, IntersectionType};
 pub use lane::{Lane, LaneID, LaneType, PARKING_SPOT_LENGTH};
 pub use make::RoadSpec;