Method DecodeSegment

tools/openlr/openlr_decoder.cpp:317–391

  {}

  bool DecodeSegment(LinearSegment const & segment, DecodedPath & path, v2::Stats & stat)
  {
    LOG(LINFO, ("DecodeSegment(...) seg id:", segment.m_segmentId, ", point num:", segment.GetLRPs().size()));

    uint32_t constexpr kMaxJunctionCandidates = 10;
    uint32_t constexpr kMaxProjectionCandidates = 5;

    path.m_segmentId.Set(segment.m_segmentId);

    auto const & points = segment.GetLRPs();
    CHECK_GREATER(points.size(), 1, ("A segment cannot consist of less than two points"));
    vector<ScorePathVec> lineCandidates;
    lineCandidates.reserve(points.size());
    LOG(LINFO, ("Decoding segment:", segment.m_segmentId, "with", points.size(), "points"));

    ScoreCandidatePointsGetter pointsGetter(kMaxJunctionCandidates, kMaxProjectionCandidates, m_dataSource, m_graph);
    ScoreCandidatePathsGetter pathsGetter(pointsGetter, m_graph, m_infoGetter, stat);

    if (!pathsGetter.GetLineCandidatesForPoints(points, segment.m_source, lineCandidates))
      return false;

    vector<Graph::EdgeVector> resultPath;
    ScorePathsConnector connector(m_graph, m_infoGetter, stat);
    if (!connector.FindBestPath(points, lineCandidates, segment.m_source, resultPath))
    {
      LOG(LINFO, ("Connections not found:", segment.m_segmentId));
      auto const mercatorPoints = segment.GetMercatorPoints();
      for (auto const & mercatorPoint : mercatorPoints)
        LOG(LINFO, (mercator::ToLatLon(mercatorPoint)));
      return false;
    }

    Graph::EdgeVector route;
    for (auto const & part : resultPath)
      route.insert(route.end(), part.begin(), part.end());

    double requiredRouteDistanceM = 0.0;
    // Sum up all distances between points. Last point's m_distanceToNextPoint
    // should be equal to zero, but let's skip it just in case.
    CHECK(!points.empty(), ());
    for (auto it = points.begin(); it != prev(points.end()); ++it)
      requiredRouteDistanceM += it->m_distanceToNextPoint;

    double actualRouteDistanceM = 0.0;
    for (auto const & e : route)
      actualRouteDistanceM += EdgeLength(e);

    auto const scale = actualRouteDistanceM / requiredRouteDistanceM;
    LOG(LINFO, ("actualRouteDistance:", actualRouteDistanceM, "requiredRouteDistance:", requiredRouteDistanceM,
                "scale:", scale));

    if (segment.m_locationReference.m_positiveOffsetMeters + segment.m_locationReference.m_negativeOffsetMeters >=
        requiredRouteDistanceM)
    {
      ++stat.m_wrongOffsets;
      LOG(LINFO, ("Wrong offsets for segment:", segment.m_segmentId));
      return false;
    }