Add a third TripEndpoint case to appear at an exact Position (lane + distance). This is a necessary step before simplifying Scenario's IndividTrip to use TripEndpoints and mode instead of SpawnTrip. #258

game/src/info/person.rs

@@ -383,6 +383,7 @@ pub fn schedule(
                 }
             }
             TripEndpoint::Border(_) => "off-map".to_string(),
+            TripEndpoint::SuddenlyAppear(_) => "suddenly appear".to_string(),
         };
         rows.push(
             Text::from(Line(format!(
@@ -412,6 +413,7 @@ pub fn schedule(
             }
         }
         TripEndpoint::Border(_) => "off-map".to_string(),
+        TripEndpoint::SuddenlyAppear(_) => "suddenly disappear".to_string(),
     };
     rows.push(
         Text::from(Line(format!(

game/src/info/trip.rs

@@ -899,5 +899,13 @@ fn endpoint(endpt: &TripEndpoint, app: &App) -> (ID, Pt2D, String) {
                 ),
             )
         }
+        TripEndpoint::SuddenlyAppear(pos) => (
+            ID::Lane(pos.lane()),
+            pos.pt(&app.primary.map),
+            format!(
+                "suddenly appear {} along",
+                pos.dist_along().to_string(&app.opts.units)
+            ),
+        ),
     }
 }

game/src/sandbox/dashboards/commuter.rs

@@ -85,10 +85,12 @@ impl CommuterPatterns {
             let block1 = match trip.start {
                 TripEndpoint::Bldg(b) => bldg_to_block[&b],
                 TripEndpoint::Border(i) => border_to_block[&i],
+                TripEndpoint::SuddenlyAppear(_) => continue,
             };
             let block2 = match trip.end {
                 TripEndpoint::Bldg(b) => bldg_to_block[&b],
                 TripEndpoint::Border(i) => border_to_block[&i],
+                TripEndpoint::SuddenlyAppear(_) => continue,
             };
             // Totally ignore trips within the same block
             if block1 != block2 {
@@ -151,6 +153,7 @@ impl CommuterPatterns {
                             count.inc(self.border_to_block[&i]);
                         }
                     }
+                    TripEndpoint::SuddenlyAppear(_) => {}
                 }
             } else {
                 match trip.start {
@@ -162,6 +165,7 @@ impl CommuterPatterns {
                             count.inc(self.border_to_block[&i]);
                         }
                     }
+                    TripEndpoint::SuddenlyAppear(_) => {}
                 }
             }
         }

game/src/sandbox/dashboards/generic_trip_table.rs

@@ -169,6 +169,7 @@ fn preview_route(g: &mut GfxCtx, app: &App, id: TripID) -> GeomBatch {
             .centered_on(match trip.start {
                 TripEndpoint::Bldg(b) => app.primary.map.get_b(b).label_center,
                 TripEndpoint::Border(i) => app.primary.map.get_i(i).polygon.center(),
+                TripEndpoint::SuddenlyAppear(pos) => pos.pt(&app.primary.map),
             }),
     );
     batch.append(
@@ -182,6 +183,7 @@ fn preview_route(g: &mut GfxCtx, app: &App, id: TripID) -> GeomBatch {
             .centered_on(match trip.end {
                 TripEndpoint::Bldg(b) => app.primary.map.get_b(b).label_center,
                 TripEndpoint::Border(i) => app.primary.map.get_i(i).polygon.center(),
+                TripEndpoint::SuddenlyAppear(pos) => pos.pt(&app.primary.map),
             }),
     );
 

game/src/sandbox/gameplay/freeform.rs

@@ -433,6 +433,7 @@ impl State<App> for AgentSpawner {
                 match endpt {
                     TripEndpoint::Border(i) => app.primary.map.get_i(*i).polygon.clone(),
                     TripEndpoint::Bldg(b) => app.primary.map.get_b(*b).polygon.clone(),
+                    TripEndpoint::SuddenlyAppear(_) => unreachable!(),
                 },
             );
         }
@@ -442,6 +443,7 @@ impl State<App> for AgentSpawner {
                 match endpt {
                     TripEndpoint::Border(i) => app.primary.map.get_i(*i).polygon.clone(),
                     TripEndpoint::Bldg(b) => app.primary.map.get_b(*b).polygon.clone(),
+                    TripEndpoint::SuddenlyAppear(_) => unreachable!(),
                 },
             );
             if let Some(p) = poly {
@@ -513,8 +515,14 @@ pub fn spawn_agents_around(i: IntersectionID, app: &mut App) {
                     now,
                     TripSpec::JustWalking {
                         start: SidewalkSpot::suddenly_appear(
+                            Position::new(
                                 lane.id,
-                            Scenario::rand_dist(&mut rng, 0.1 * lane.length(), 0.9 * lane.length()),
+                                Scenario::rand_dist(
+                                    &mut rng,
+                                    0.1 * lane.length(),
+                                    0.9 * lane.length(),
+                                ),
+                            ),
                             map,
                         ),
                         goal: SidewalkSpot::building(

sim/src/lib.rs

@@ -523,12 +523,12 @@ impl SidewalkSpot {
         })
     }
 
-    pub fn suddenly_appear(l: LaneID, dist: Distance, map: &Map) -> SidewalkSpot {
-        let lane = map.get_l(l);
+    pub fn suddenly_appear(pos: Position, map: &Map) -> SidewalkSpot {
+        let lane = map.get_l(pos.lane());
         assert!(lane.is_walkable());
-        assert!(dist <= lane.length());
+        assert!(pos.dist_along() <= lane.length());
         SidewalkSpot {
-            sidewalk_pos: Position::new(l, dist),
+            sidewalk_pos: pos,
             connection: SidewalkPOI::SuddenlyAppear,
         }
     }

sim/src/make/activity_model.rs

@@ -159,6 +159,8 @@ impl ScenarioGenerator {
                     (TripEndpoint::Border(_), TripEndpoint::Border(_)) => {
                         num_trips_passthru += 1;
                     }
+                    (TripEndpoint::SuddenlyAppear(_), _) => unreachable!(),
+                    (_, TripEndpoint::SuddenlyAppear(_)) => unreachable!(),
                 };
 
                 (home, work, fork_rng(rng))

sim/src/make/scenario.rs

@@ -511,9 +511,7 @@ impl SpawnTrip {
 
     pub fn start(&self, map: &Map) -> TripEndpoint {
         match self {
-            SpawnTrip::VehicleAppearing { ref start, .. } => {
-                TripEndpoint::Border(map.get_l(start.lane()).src_i)
-            }
+            SpawnTrip::VehicleAppearing { start, .. } => TripEndpoint::SuddenlyAppear(*start),
             SpawnTrip::FromBorder { dr, .. } => TripEndpoint::Border(dr.src_i(map)),
             SpawnTrip::UsingParkedCar(b, _) => TripEndpoint::Bldg(*b),
             SpawnTrip::UsingBike(b, _) => TripEndpoint::Bldg(*b),
@@ -521,9 +519,7 @@ impl SpawnTrip {
                 match spot.connection {
                     SidewalkPOI::Building(b) => TripEndpoint::Bldg(b),
                     SidewalkPOI::Border(i) => TripEndpoint::Border(i),
-                    SidewalkPOI::SuddenlyAppear => {
-                        TripEndpoint::Border(map.get_l(spot.sidewalk_pos.lane()).src_i)
-                    }
+                    SidewalkPOI::SuddenlyAppear => TripEndpoint::SuddenlyAppear(spot.sidewalk_pos),
                     _ => unreachable!(),
                 }
             }
@@ -565,6 +561,11 @@ impl SpawnTrip {
                     goal: to.driving_goal(PathConstraints::Car, map)?,
                     is_bike: false,
                 },
+                TripEndpoint::SuddenlyAppear(start) => SpawnTrip::VehicleAppearing {
+                    start,
+                    goal: to.driving_goal(PathConstraints::Bike, map)?,
+                    is_bike: false,
+                },
             },
             TripMode::Bike => match from {
                 TripEndpoint::Bldg(b) => {
@@ -575,6 +576,11 @@ impl SpawnTrip {
                     goal: to.driving_goal(PathConstraints::Bike, map)?,
                     is_bike: true,
                 },
+                TripEndpoint::SuddenlyAppear(start) => SpawnTrip::VehicleAppearing {
+                    start,
+                    goal: to.driving_goal(PathConstraints::Bike, map)?,
+                    is_bike: true,
+                },
             },
             TripMode::Walk => {
                 SpawnTrip::JustWalking(from.start_sidewalk_spot(map)?, to.end_sidewalk_spot(map)?)
@@ -610,11 +616,11 @@ impl PersonSpec {
             // Once off-map, re-enter via any border node.
             let end_bldg = match pair.0.trip.end(map) {
                 TripEndpoint::Bldg(b) => Some(b),
-                TripEndpoint::Border(_) => None,
+                TripEndpoint::Border(_) | TripEndpoint::SuddenlyAppear(_) => None,
             };
             let start_bldg = match pair.1.trip.start(map) {
                 TripEndpoint::Bldg(b) => Some(b),
-                TripEndpoint::Border(_) => None,
+                TripEndpoint::Border(_) | TripEndpoint::SuddenlyAppear(_) => None,
             };
 
             if end_bldg != start_bldg {

sim/src/trips.rs

@@ -150,7 +150,7 @@ impl TripManager {
                         .push(Event::PersonEntersBuilding(trip.person, b));
                     PersonState::Inside(b)
                 }
-                TripEndpoint::Border(_) => PersonState::OffMap,
+                TripEndpoint::Border(_) | TripEndpoint::SuddenlyAppear(_) => PersonState::OffMap,
             };
         }
         if let Some(t) = person.trips.last() {
@@ -715,20 +715,20 @@ impl TripManager {
         if let PersonState::Inside(b) = self.people[person.0].state {
             self.events.push(Event::PersonLeavesBuilding(person, b));
         }
-        match trip.info.end {
+        // Warp to the destination
+        self.people[person.0].state = match trip.info.end {
             TripEndpoint::Bldg(b) => {
                 self.events.push(Event::PersonEntersBuilding(person, b));
+                PersonState::Inside(b)
             }
             TripEndpoint::Border(i) => {
                 self.events.push(Event::PersonLeavesMap(person, None, i));
+                PersonState::OffMap
             }
-        }
-
-        // Warp to the destination
-        self.people[person.0].state = match trip.info.end {
-            TripEndpoint::Bldg(b) => PersonState::Inside(b),
-            TripEndpoint::Border(_) => PersonState::OffMap,
+            // Can't end trips here yet
+            TripEndpoint::SuddenlyAppear(_) => unreachable!(),
         };
+
         // Don't forget the car!
         if let Some(vehicle) = abandoned_vehicle {
             if vehicle.vehicle_type == VehicleType::Car {
@@ -1515,10 +1515,13 @@ impl TripMode {
     }
 }
 
+/// Specifies where a trip begins or ends.
 #[derive(Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord, Debug, Clone)]
 pub enum TripEndpoint {
     Bldg(BuildingID),
     Border(IntersectionID),
+    /// Used for interactive spawning, tests, etc. For now, only valid as a trip's start.
+    SuddenlyAppear(Position),
 }
 
 impl TripEndpoint {
@@ -1576,6 +1579,7 @@ fn pos(endpt: TripEndpoint, mode: TripMode, from: bool, map: &Map) -> Option<Pos
                 .map(|l| Position::start(*l))
             }),
         },
+        TripEndpoint::SuddenlyAppear(pos) => Some(pos),
     }
 }
 
@@ -1643,6 +1647,7 @@ impl TripEndpoint {
         match self {
             TripEndpoint::Bldg(b) => Some(SidewalkSpot::building(*b, map)),
             TripEndpoint::Border(i) => SidewalkSpot::start_at_border(*i, map),
+            TripEndpoint::SuddenlyAppear(pos) => Some(SidewalkSpot::suddenly_appear(*pos, map)),
         }
     }
 
@@ -1650,6 +1655,7 @@ impl TripEndpoint {
         match self {
             TripEndpoint::Bldg(b) => Some(SidewalkSpot::building(*b, map)),
             TripEndpoint::Border(i) => SidewalkSpot::end_at_border(*i, map),
+            TripEndpoint::SuddenlyAppear(_) => unreachable!(),
         }
     }
 
@@ -1663,6 +1669,7 @@ impl TripEndpoint {
             TripEndpoint::Border(i) => {
                 DrivingGoal::end_at_border(map.get_i(*i).some_incoming_road(map)?, constraints, map)
             }
+            TripEndpoint::SuddenlyAppear(_) => unreachable!(),
         }
     }
 }