allow a NaN in kinematics

docs/TODO_quality.md

@@ -5,7 +5,6 @@
 - try fixed pt again, for determinism purposes mostly
 	- go through and use less f64's... like LANE_THICKNESS, make_polygons, Circle::new, project_away
 	- audit inner_foo()'s
-	- rerun import, all tests, screenshots
 
 	- change internal pt2d representation to int. JUST get that working first.
 		- clamp distances first, not points?

sim/src/driving.rs

@@ -851,7 +851,7 @@ impl DrivingSimState {
         };
 
         let body = if let Some(ref parking) = c.parking {
-            let progress: f64 = (time - parking.started_at).as_time() / TIME_TO_PARK_OR_DEPART;
+            let progress = (time - parking.started_at).as_time() / TIME_TO_PARK_OR_DEPART;
             assert!(progress >= 0.0 && progress <= 1.0);
             let project_away_ratio = if parking.is_parking {
                 progress

sim/src/kinematics.rs

@@ -166,7 +166,8 @@ impl Vehicle {
                 / (2.0 * dist.inner_meters()),
         );
         // TODO might validlyish be NaN, so just f64 here
-        let required_time: f64 = (speed / normal_case * -1.0).inner_seconds();
+        let required_time =
+            -1.0 * speed.inner_meters_per_second() / normal_case.inner_meters_per_second_squared();
 
         if self.debug {
             debug!(

sim/src/walking.rs

@@ -312,7 +312,7 @@ impl Pedestrian {
             );
             let line = Line::new(sidewalk_pos.pt(map), street_pos.pt(map));
 
-            let progress: f64 = (now - bp.started_at).as_time() / TIME_TO_PREPARE_BIKE;
+            let progress = (now - bp.started_at).as_time() / TIME_TO_PREPARE_BIKE;
             assert!(progress >= 0.0 && progress <= 1.0);
             let ratio = if bp.is_parking {
                 1.0 - progress