show route by trip, not agent

editor/src/plugins/show_route.rs

@@ -2,61 +2,60 @@ use colors::Colors;
 use dimensioned::si;
 use ezgui::GfxCtx;
 use map_model::{Trace, LANE_THICKNESS};
-use objects::{Ctx, ID};
+use objects::Ctx;
 use piston::input::Key;
 use plugins::{Plugin, PluginCtx};
-use sim::AgentID;
+use sim::TripID;
 use std::f64;
 
 pub enum ShowRouteState {
     Empty,
-    Active(AgentID, Trace),
+    Active(TripID, Trace),
 }
 
 impl Plugin for ShowRouteState {
     fn event(&mut self, ctx: PluginCtx) -> bool {
-        let (input, sim, map, selected) = (
-            ctx.input,
-            &ctx.primary.sim,
-            &ctx.primary.map,
-            ctx.primary.current_selection,
-        );
-
-        let maybe_agent = match self {
-            ShowRouteState::Empty => match selected {
-                Some(ID::Car(id)) => {
-                    if input.key_pressed(Key::R, "show this car's route") {
-                        Some(AgentID::Car(id))
+        let maybe_trip = match self {
+            ShowRouteState::Empty => ctx
+                .primary
+                .current_selection
+                .and_then(|id| id.agent_id())
+                .and_then(|agent| ctx.primary.sim.agent_to_trip(agent))
+                .and_then(|trip| {
+                    if ctx
+                        .input
+                        .key_pressed(Key::R, &format!("show {}'s route", trip))
+                    {
+                        Some(trip)
                     } else {
                         None
                     }
-                }
-                Some(ID::Pedestrian(id)) => {
-                    if input.key_pressed(Key::R, "show this pedestrian's route") {
-                        Some(AgentID::Pedestrian(id))
-                    } else {
-                        None
-                    }
-                }
-                _ => None,
-            },
-            ShowRouteState::Active(agent, _) => {
-                if input.key_pressed(Key::Return, "stop showing route") {
+                }),
+            ShowRouteState::Active(trip, _) => {
+                if ctx.input.key_pressed(Key::Return, "stop showing route") {
                     None
                 } else {
-                    Some(*agent)
+                    Some(*trip)
                 }
             }
         };
-        if let Some(agent) = maybe_agent {
-            // Trace along the entire route by passing in max distance
-            match sim.trace_route(agent, map, f64::MAX * si::M) {
-                Some(trace) => {
-                    *self = ShowRouteState::Active(agent, trace);
-                }
-                None => {
-                    *self = ShowRouteState::Empty;
+        if let Some(trip) = maybe_trip {
+            if let Some(agent) = ctx.primary.sim.trip_to_agent(trip) {
+                // Trace along the entire route by passing in max distance
+                if let Some(trace) =
+                    ctx.primary
+                        .sim
+                        .trace_route(agent, &ctx.primary.map, f64::MAX * si::M)
+                {
+                    *self = ShowRouteState::Active(trip, trace);
+                } else {
+                    warn!("{} has no trace right now", agent);
                 }
+            } else {
+                warn!(
+                    "{} has no agent associated right now; is the trip done?",
+                    trip
+                );
             }
         } else {
             *self = ShowRouteState::Empty;

sim/src/sim.rs

@@ -384,7 +384,7 @@ impl Sim {
 
     // TODO dont toggle state in debug_car
     pub fn debug_trip(&mut self, id: TripID) {
-        match self.trips_state.current_mode(id) {
+        match self.trips_state.trip_to_agent(id) {
             Some(AgentID::Car(id)) => self.debug_car(id),
             Some(AgentID::Pedestrian(id)) => self.debug_ped(id),
             None => println!("{} doesn't exist", id),
@@ -395,9 +395,13 @@ impl Sim {
         self.trips_state.agent_to_trip(id)
     }
 
+    pub fn trip_to_agent(&self, id: TripID) -> Option<AgentID> {
+        self.trips_state.trip_to_agent(id)
+    }
+
     pub fn get_canonical_point_for_trip(&self, id: TripID, map: &Map) -> Option<Pt2D> {
         // Don't unwrap(); the trip might be registered before the agent has started.
-        match self.trips_state.current_mode(id) {
+        match self.trips_state.trip_to_agent(id) {
             Some(AgentID::Car(id)) => self
                 .driving_state
                 .get_draw_car(id, self.time, map)

sim/src/trips.rs

@@ -226,7 +226,7 @@ impl TripManager {
         self.active_trip_mode.keys().cloned().collect()
     }
 
-    pub fn current_mode(&self, id: TripID) -> Option<AgentID> {
+    pub fn trip_to_agent(&self, id: TripID) -> Option<AgentID> {
         let trip = self.trips.get(id.0)?;
         match trip.legs[0] {
             TripLeg::Walk(_) => Some(AgentID::Pedestrian(trip.ped)),