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Avoid crashing when we try to draw a vehicle that's literally just

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spawned at a border and hasn't advanced at all.
This commit is contained in:
Dustin Carlino 2021-02-01 18:18:46 -08:00
parent 02b90741d6
commit 2bbc43b529
1 changed files with 11 additions and 8 deletions
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19
sim/src/mechanics/car.rs
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@ -2,7 +2,7 @@ use std::collections::VecDeque;
use serde::{Deserialize, Serialize};
use geom::{Distance, Duration, PolyLine, Time};
use geom::{Distance, Duration, PolyLine, Time, EPSILON_DIST};
use map_model::{Direction, Map, Traversable};
use crate::{
@ -107,13 +107,16 @@ impl Car {
}
if result.len() < 2 {
panic!(
"{} at {} has front at {} of {:?}. Didn't even wind up with two points",
self.vehicle.id,
now,
front,
self.router.head()
);
// Vehicles spawning at a border start with their front at literally 0 distance.
// Usually by the time we first try to render, they've advanced at least a little.
// But sometimes there's a race when we try to immediately draw them.
if let Ok((pl, _)) =
self.router
.head()
.slice(Distance::ZERO, 2.0 * EPSILON_DIST, map)
{
result = pl.into_points();
}
}
match PolyLine::new(result) {
Ok(pl) => pl,