refactoring intersection->roads query

control/src/stop_signs.rs

@@ -38,8 +38,8 @@ impl ControlStopSign {
     }
 
     fn smart_assignment(map: &Map, intersection: IntersectionID) -> ControlStopSign {
-        if map.get_i(intersection).get_roads(map).len() <= 2 {
-            return ControlStopSign::for_degenerate_intersection(map, intersection);
+        if map.get_i(intersection).roads.len() <= 2 {
+            return ControlStopSign::for_degenerate_and_deadend(map, intersection);
         }
 
         // Higher numbers are higher rank roads
@@ -127,7 +127,7 @@ impl ControlStopSign {
         ss
     }
 
-    fn for_degenerate_intersection(map: &Map, i: IntersectionID) -> ControlStopSign {
+    fn for_degenerate_and_deadend(map: &Map, i: IntersectionID) -> ControlStopSign {
         let mut ss = ControlStopSign {
             intersection: i,
             turns: BTreeMap::new(),
@@ -146,7 +146,7 @@ impl ControlStopSign {
         // intersection geometry), sometimes more turns conflict than really should. For now, just
         // detect and fallback to an all-way stop.
         if let Err(err) = ss.validate(map, i) {
-            warn!("Giving up on for_degenerate_intersection({}): {}", i, err);
+            warn!("Giving up on for_degenerate_and_deadend({}): {}", i, err);
             return ControlStopSign::all_way_stop(map, i);
         }
 

editor/src/render/intersection.rs

@@ -35,7 +35,7 @@ impl DrawIntersection {
             crosswalks: calculate_crosswalks(inter.id, map),
             sidewalk_corners: calculate_corners(inter.id, map),
             has_traffic_signal: inter.has_traffic_signal,
-            should_draw_stop_sign: !inter.has_traffic_signal && !inter.is_degenerate(map),
+            should_draw_stop_sign: !inter.has_traffic_signal && !inter.is_degenerate(),
         }
     }
 

map_model/src/intersection.rs

@@ -5,7 +5,7 @@ use dimensioned::si;
 use geom::Pt2D;
 use std::collections::BTreeSet;
 use std::fmt;
-use {LaneID, Map, RoadID, TurnID};
+use {LaneID, RoadID, TurnID};
 
 // TODO reconsider pub usize. maybe outside world shouldnt know.
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq, PartialOrd, Ord, Serialize, Deserialize)]
@@ -32,6 +32,8 @@ pub struct Intersection {
     // TODO narrow down when and why. is it just sidewalks in weird cases?
     pub incoming_lanes: Vec<LaneID>,
     pub outgoing_lanes: Vec<LaneID>,
+
+    pub roads: BTreeSet<RoadID>,
 }
 
 impl PartialEq for Intersection {
@@ -41,20 +43,12 @@ impl PartialEq for Intersection {
 }
 
 impl Intersection {
-    pub fn get_roads(&self, map: &Map) -> BTreeSet<RoadID> {
-        let mut roads: BTreeSet<RoadID> = BTreeSet::new();
-        for l in self.incoming_lanes.iter().chain(self.outgoing_lanes.iter()) {
-            roads.insert(map.get_l(*l).parent);
-        }
-        roads
+    pub fn is_dead_end(&self) -> bool {
+        self.roads.len() == 1
     }
 
-    pub fn is_dead_end(&self, map: &Map) -> bool {
-        self.get_roads(map).len() == 1
-    }
-
-    pub fn is_degenerate(&self, map: &Map) -> bool {
-        self.get_roads(map).len() == 2
+    pub fn is_degenerate(&self) -> bool {
+        self.roads.len() == 2
     }
 
     pub fn dump_debug(&self) {

map_model/src/make/intersections.rs

@@ -1,7 +1,6 @@
 use abstutil::wraparound_get;
 use dimensioned::si;
 use geom::{Angle, PolyLine, Pt2D};
-use std::collections::BTreeSet;
 use std::marker;
 use {Intersection, Road, RoadID, LANE_THICKNESS};
 
@@ -12,16 +11,13 @@ const DEGENERATE_INTERSECTION_HALF_LENGTH: si::Meter<f64> = si::Meter {
 
 // The polygon should exist entirely within the thick bands around all original roads -- it just
 // carves up part of that space, doesn't reach past it.
-pub fn intersection_polygon(
-    i: &Intersection,
-    road_ids: BTreeSet<RoadID>,
-    roads: &Vec<Road>,
-) -> Vec<Pt2D> {
+pub fn intersection_polygon(i: &Intersection, roads: &Vec<Road>) -> Vec<Pt2D> {
     // Turn all of the incident roads into two PolyLines (the "forwards" and "backwards" borders of
     // the road), both with an endpoint at i.point, and the angle of the last segment of the center
     // line.
-    let mut lines: Vec<(RoadID, Angle, PolyLine, PolyLine)> = road_ids
-        .into_iter()
+    let mut lines: Vec<(RoadID, Angle, PolyLine, PolyLine)> = i
+        .roads
+        .iter()
         .map(|id| {
             let r = &roads[id.0];
             let fwd_width = LANE_THICKNESS * (r.children_forwards.len() as f64);
@@ -37,7 +33,7 @@ pub fn intersection_polygon(
 
             let pl_normal = line.shift(width_normal).unwrap();
             let pl_reverse = line.reversed().shift(width_reverse).unwrap().reversed();
-            (id, line.last_line().angle(), pl_normal, pl_reverse)
+            (*id, line.last_line().angle(), pl_normal, pl_reverse)
         }).collect();
 
     // Sort the polylines by the angle of their last segment.

map_model/src/make/turns.rs

@@ -57,12 +57,11 @@ fn dedupe(turns: Vec<Turn>) -> Vec<Turn> {
 }
 
 fn make_driving_turns(i: &Intersection, map: &Map) -> Vec<Turn> {
-    if i.is_dead_end(map) {
+    if i.is_dead_end() {
         return make_driving_turns_for_dead_end(i, map);
     }
 
-    // TODO make get_roads do this?
-    let roads: Vec<&Road> = i.get_roads(map).into_iter().map(|r| map.get_r(r)).collect();
+    let roads: Vec<&Road> = i.roads.iter().map(|r| map.get_r(*r)).collect();
 
     let mut result = Vec::new();
 
@@ -148,7 +147,7 @@ fn match_up_driving_lanes(
 }
 
 fn make_driving_turns_for_dead_end(i: &Intersection, map: &Map) -> Vec<Turn> {
-    let road = map.get_r(i.get_roads(map).into_iter().next().unwrap());
+    let road = map.get_r(*i.roads.iter().next().unwrap());
     let incoming = filter_driving_lanes(road.incoming_lanes(i.id));
     let outgoing = filter_driving_lanes(road.outgoing_lanes(i.id));
     if incoming.is_empty() || outgoing.is_empty() {
@@ -248,7 +247,7 @@ fn make_turns(
         assert_eq!(map.get_l(*l).src_i, parent);
     }
 
-    let dead_end = map.get_i(parent).is_dead_end(map);
+    let dead_end = map.get_i(parent).is_dead_end();
 
     let mut result = Vec::new();
     for src in incoming {
@@ -276,10 +275,10 @@ fn make_walking_turns(i: &Intersection, map: &Map) -> Vec<Turn> {
     // Sort roads by the angle into the intersection, so we can reason about sidewalks of adjacent
     // roads.
     let mut roads: Vec<(RoadID, Angle)> = i
-        .get_roads(map)
-        .into_iter()
+        .roads
+        .iter()
         .map(|id| {
-            let r = map.get_r(id);
+            let r = map.get_r(*id);
 
             if r.src_i == i.id {
                 (r.id, r.center_pts.reversed().last_line().angle())

map_model/src/map.rs

@@ -95,6 +95,7 @@ impl Map {
                 has_traffic_signal: i.has_traffic_signal,
                 incoming_lanes: Vec::new(),
                 outgoing_lanes: Vec::new(),
+                roads: BTreeSet::new(),
             });
             pt_to_intersection.insert(HashablePt2D::from(pt), id);
         }
@@ -135,7 +136,9 @@ impl Map {
                 }
                 let (src_i, dst_i) = if lane.reverse_pts { (i2, i1) } else { (i1, i2) };
                 m.intersections[src_i.0].outgoing_lanes.push(id);
+                m.intersections[src_i.0].roads.insert(road_id);
                 m.intersections[dst_i.0].incoming_lanes.push(id);
+                m.intersections[dst_i.0].roads.insert(road_id);
 
                 // TODO probably different behavior for oneways
                 // TODO need to factor in yellow center lines (but what's the right thing to even do?
@@ -181,8 +184,7 @@ impl Map {
                 panic!("{:?} is orphaned!", i);
             }
 
-            let incident_roads = i.get_roads(&m);
-            intersection_polygons.push(make::intersection_polygon(i, incident_roads, &m.roads));
+            intersection_polygons.push(make::intersection_polygon(i, &m.roads));
         }
         for (idx, p) in intersection_polygons.into_iter().enumerate() {
             m.intersections[idx].polygon = p;
@@ -423,7 +425,7 @@ impl Map {
 
         let r = self.get_r(from);
         for id in vec![r.src_i, r.dst_i].into_iter() {
-            roads.extend(self.get_i(id).get_roads(self));
+            roads.extend(self.get_i(id).roads.clone());
         }
 
         roads.into_iter().collect()