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[traffic] Exclude roundabouts from decoded locations (with exceptions)

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Signed-off-by: mvglasow <michael -at- vonglasow.com>
This commit is contained in:
mvglasow
2025-10-25 15:09:28 +03:00
parent 46d363ae24
commit 9065f45b21
4 changed files with 102 additions and 0 deletions
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39
libs/traffxml/traff_decoder.cpp
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@@ -1030,6 +1030,32 @@ void RoutingTraffDecoder::DecodeLocationDirection(traffxml::TraffMessage & messa
TruncateRoute(rsegments, checkpoints);
/*
* `m_onRoundabout` is set only for the first segment after the junction. In order to identify
* all roundabout segments, cache the last segment with `m_onRoundabout` set. Any subsequent
* segment with the same MWM and feature ID is also a roundabout segment.
*/
routing::Segment lastRoundaboutSegment;
/*
* We usually discard roundabouts, unless the location is a point (`at` point set) or the entire
* decoded location is a roundabout.
*/
bool keepRoundabouts = true;
if (!message.m_location.value().m_at)
for (auto & rsegment : rsegments)
{
if (rsegment.GetRoadNameInfo().m_onRoundabout)
lastRoundaboutSegment = rsegment.GetSegment();
else if ((rsegment.GetSegment().GetMwmId() != lastRoundaboutSegment.GetMwmId())
|| (rsegment.GetSegment().GetFeatureId() != lastRoundaboutSegment.GetFeatureId()))
{
keepRoundabouts = false;
break;
}
}
if (!backwards && message.m_location.value().m_at && !message.m_location.value().m_to)
// from–at in forward direction, add last segment
AddDecodedSegment(decoded, rsegments.back().GetSegment());
@@ -1070,6 +1096,19 @@ void RoutingTraffDecoder::DecodeLocationDirection(traffxml::TraffMessage & messa
{
routing::Segment & segment = rsegment.GetSegment();
// Skip roundabouts to avoid side effects on crossing roads
if (!keepRoundabouts)
{
if (rsegment.GetRoadNameInfo().m_onRoundabout)
{
lastRoundaboutSegment = segment;
continue;
}
else if ((segment.GetMwmId() == lastRoundaboutSegment.GetMwmId())
&& (segment.GetFeatureId() == lastRoundaboutSegment.GetFeatureId()))
continue;
}
// If we have more than two checkpoints, fake segments can occur in the middle, skip them.
if (segment.GetMwmId() == routing::kFakeNumMwmId)
continue;