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Adjust threshold when trimming steps (needs to be bigger).

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Also, when trimming the last step, we need to copy name values from the new next-to-last step, otherwise
we can still end up with an arrive step on a different road to the last maneuver.
This commit is contained in:
Daniel Patterson 2016-03-31 16:08:56 -07:00
parent b52c8819f5
commit f87a13f5cf
1 changed files with 14 additions and 3 deletions
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17
src/engine/guidance/post_processing.cpp
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@ -318,7 +318,8 @@ void trimShortSegments(std::vector<RouteStep> &steps, LegGeometry &geometry)
// To catch these cases correctly, we have to perform trimming prior to the post-processing
BOOST_ASSERT(geometry.locations.size() >= steps.size());
const bool zero_length_step = steps.front().distance <= std::numeric_limits<double>::epsilon();
// Look for distances under 1m
const bool zero_length_step = steps.front().distance <= 1;
const bool duplicated_coordinate = geometry.locations[0] == geometry.locations[1];
if (zero_length_step || duplicated_coordinate)
{
@ -387,16 +388,26 @@ void trimShortSegments(std::vector<RouteStep> &steps, LegGeometry &geometry)
auto &next_to_last_step = *(steps.end() - 2);
// in the end, the situation with the roundabout cannot occur. As a result, we can remove all
// zero-length instructions
if (next_to_last_step.distance <= std::numeric_limits<double>::epsilon())
if (next_to_last_step.distance <= 1)
{
geometry.locations.pop_back();
geometry.segment_offsets.pop_back();
BOOST_ASSERT(geometry.segment_distances.back() < std::numeric_limits<double>::epsilon());
BOOST_ASSERT(geometry.segment_distances.back() < 1);
geometry.segment_distances.pop_back();
next_to_last_step.maneuver = detail::stepManeuverFromGeometry(
TurnInstruction::NO_TURN(), WaypointType::Arrive, geometry);
steps.pop_back();
// Because we eliminated a really short segment, it was probably
// near an intersection. The convention is *not* to make the
// turn, so the `arrive` instruction should be on the same road
// as the segment before it. Thus, we have to copy the names
// and travel modes from the new next_to_last step.
auto &new_next_to_last = *(steps.end() - 2);
next_to_last_step.name = new_next_to_last.name;
next_to_last_step.name_id = new_next_to_last.name_id;
next_to_last_step.mode = new_next_to_last.mode;
// the geometry indices of the last step are already correct;
}
else if (geometry.locations[geometry.locations.size() - 2] ==