Rank each street inside a neighborhood as quiet/busy, based on the number of rat-runs through it.

Show this through a heatmap and tooltips

game/src/ltn/rat_run_viewer.rs

@@ -1,9 +1,10 @@
 use geom::ArrowCap;
-use map_model::NORMAL_LANE_THICKNESS;
-use widgetry::mapspace::ToggleZoomed;
+use map_gui::tools::ColorNetwork;
+use map_model::{IntersectionID, RoadID, NORMAL_LANE_THICKNESS};
+use widgetry::mapspace::{ObjectID, ToggleZoomed, World};
 use widgetry::{
-    Color, EventCtx, GfxCtx, HorizontalAlignment, Key, Line, Outcome, Panel, State, Text, TextExt,
-    VerticalAlignment, Widget,
+    Color, EventCtx, GeomBatch, GfxCtx, HorizontalAlignment, Key, Line, Outcome, Panel, State,
+    Text, TextExt, Toggle, VerticalAlignment, Widget,
 };
 
 use super::rat_runs::{find_rat_runs, RatRuns};
@@ -16,6 +17,8 @@ pub struct BrowseRatRuns {
     current_idx: usize,
 
     draw_path: ToggleZoomed,
+    draw_heatmap: ToggleZoomed,
+    world: World<Obj>,
     neighborhood: Neighborhood,
 }
 
@@ -33,12 +36,23 @@ impl BrowseRatRuns {
                 timer,
             )
         });
+        let mut colorer = ColorNetwork::no_fading(app);
+        colorer.ranked_roads(rat_runs.count_per_road.clone(), &app.cs.good_to_bad_red);
+        // TODO These two will be on different scales, which'll look really weird!
+        colorer.ranked_intersections(
+            rat_runs.count_per_intersection.clone(),
+            &app.cs.good_to_bad_red,
+        );
+        let world = make_world(ctx, app, &neighborhood, &rat_runs);
+
         let mut state = BrowseRatRuns {
             panel: Panel::empty(ctx),
             rat_runs,
             current_idx: 0,
             draw_path: ToggleZoomed::empty(ctx),
+            draw_heatmap: colorer.build(ctx),
             neighborhood,
+            world,
         };
         state.recalculate(ctx, app);
         Box::new(state)
@@ -91,6 +105,16 @@ impl BrowseRatRuns {
                     .hotkey(Key::RightArrow)
                     .build_widget(ctx, "next rat run"),
             ]),
+            // TODO This should disable the individual path controls, or maybe even be a different
+            // state entirely...
+            Toggle::checkbox(
+                ctx,
+                "show heatmap of all rat-runs",
+                Key::R,
+                self.panel
+                    .maybe_is_checked("show heatmap of all rat-runs")
+                    .unwrap_or(true),
+            ),
         ]))
         .aligned(HorizontalAlignment::Left, VerticalAlignment::Top)
         .build(ctx);
@@ -140,28 +164,87 @@ impl State<App> for BrowseRatRuns {
                 }
                 "previous rat run" => {
                     self.current_idx -= 1;
+                    self.panel
+                        .set_checked("show heatmap of all rat-runs", false);
                     self.recalculate(ctx, app);
                 }
                 "next rat run" => {
                     self.current_idx += 1;
+                    self.panel
+                        .set_checked("show heatmap of all rat-runs", false);
                     self.recalculate(ctx, app);
                 }
                 _ => unreachable!(),
             }
         }
 
+        // Just trigger tooltips; no other interactions possible
+        let _ = self.world.event(ctx);
+
         Transition::Keep
     }
 
     fn draw(&self, g: &mut GfxCtx, app: &App) {
         self.panel.draw(g);
 
+        if self.panel.is_checked("show heatmap of all rat-runs") {
+            self.draw_heatmap.draw(g);
+            self.world.draw(g);
+        } else {
+            self.draw_path.draw(g);
+        }
+
         g.redraw(&self.neighborhood.fade_irrelevant);
         self.neighborhood.draw_filters.draw(g);
         if g.canvas.is_unzoomed() {
             self.neighborhood.labels.draw(g, app);
         }
-
-        self.draw_path.draw(g);
     }
 }
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+enum Obj {
+    InteriorRoad(RoadID),
+    InteriorIntersection(IntersectionID),
+}
+impl ObjectID for Obj {}
+
+fn make_world(
+    ctx: &mut EventCtx,
+    app: &App,
+    neighborhood: &Neighborhood,
+    rat_runs: &RatRuns,
+) -> World<Obj> {
+    let map = &app.primary.map;
+    let mut world = World::bounded(map.get_bounds());
+
+    for r in &neighborhood.orig_perimeter.interior {
+        world
+            .add(Obj::InteriorRoad(*r))
+            .hitbox(map.get_r(*r).get_thick_polygon())
+            .drawn_in_master_batch()
+            // TODO Not sure if tooltip() without this should imply it?
+            .draw_hovered(GeomBatch::new())
+            .tooltip(Text::from(format!(
+                "{} rat-runs cross this street",
+                rat_runs.count_per_road.get(*r)
+            )))
+            .build(ctx);
+    }
+    for i in &neighborhood.interior_intersections {
+        world
+            .add(Obj::InteriorIntersection(*i))
+            .hitbox(map.get_i(*i).polygon.clone())
+            .drawn_in_master_batch()
+            .draw_hovered(GeomBatch::new())
+            .tooltip(Text::from(format!(
+                "{} rat-runs cross this intersection",
+                rat_runs.count_per_intersection.get(*i)
+            )))
+            .build(ctx);
+    }
+
+    world.initialize_hover(ctx);
+
+    world
+}

game/src/ltn/rat_runs.rs

@@ -1,15 +1,17 @@
 use std::collections::HashSet;
 
-use abstutil::Timer;
+use abstutil::{Counter, Timer};
 use map_model::{
     DirectedRoadID, IntersectionID, LaneID, Map, Path, PathConstraints, PathRequest, PathStep,
-    Position,
+    Position, RoadID,
 };
 
 use super::{ModalFilters, Neighborhood};
 
 pub struct RatRuns {
     pub paths: Vec<Path>,
+    pub count_per_road: Counter<RoadID>,
+    pub count_per_intersection: Counter<IntersectionID>,
 }
 
 pub fn find_rat_runs(
@@ -65,9 +67,33 @@ pub fn find_rat_runs(
         (pct * 1000.0) as usize
     });
 
-    // TODO Heatmap of roads used (any direction)
+    // How many rat-runs pass through each street?
+    let mut count_per_road = Counter::new();
+    let mut count_per_intersection = Counter::new();
+    for path in &paths {
+        for step in path.get_steps() {
+            match step {
+                PathStep::Lane(l) => {
+                    if neighborhood.orig_perimeter.interior.contains(&l.road) {
+                        count_per_road.inc(l.road);
+                    }
+                }
+                PathStep::Turn(t) => {
+                    if neighborhood.interior_intersections.contains(&t.parent) {
+                        count_per_intersection.inc(t.parent);
+                    }
+                }
+                // Car paths don't make contraflow movements
+                _ => unreachable!(),
+            }
+        }
+    }
 
-    RatRuns { paths }
+    RatRuns {
+        paths,
+        count_per_road,
+        count_per_intersection,
+    }
 }
 
 struct EntryExit {

widgetry/src/widgets/panel.rs

@@ -417,6 +417,9 @@ impl Panel {
             None
         }
     }
+    pub fn set_checked(&mut self, name: &str, on_off: bool) {
+        self.find_mut::<Toggle>(name).enabled = on_off
+    }
 
     pub fn text_box(&self, name: &str) -> String {
         self.find::<TextBox>(name).get_line()