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how is a car winding up with negative dist_along? argh, another hacky

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epsilon fix
This commit is contained in:
Dustin Carlino 2018-10-22 19:56:13 -07:00
parent 9883da6fa8
commit 8a474e16b0
1 changed files with 12 additions and 0 deletions
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12
sim/src/driving.rs
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@ -289,6 +289,10 @@ impl Car {
// in this bizarre, illegal state where dist_along is > the current
// Traversable's length.
self.dist_along = self.on.length(map) - EPSILON_DIST;
// Argh, but don't go negative! Use a different epsilon sometimes?
if self.dist_along < 0.0 * si::M {
self.dist_along = self.on.length(map) - std::f64::EPSILON * si::M;
}
}
break;
}
@ -654,6 +658,14 @@ impl DrivingSimState {
let mut cars_per_lane = MultiMap::new();
let mut cars_per_turn = MultiMap::new();
for c in self.cars.values() {
// Also do some sanity checks.
if c.dist_along < 0.0 * si::M {
return Err(Error::new(format!(
"{} is {} along {:?}",
c.id, c.dist_along, c.on
)));
}
match c.on {
Traversable::Lane(id) => cars_per_lane.insert(id, c.id),
Traversable::Turn(id) => cars_per_turn.insert(id, c.id),