Method FindMyself

generator/camera_info_collector.cpp:253–319

}

std::optional<std::pair<double, uint32_t>> CamerasInfoCollector::Camera::FindMyself(uint32_t wayFeatureId,
                                                                                    FrozenDataSource const & dataSource,
                                                                                    MwmSet::MwmId const & mwmId) const
{
  double coef = 0.0;
  bool isRoad = true;
  uint32_t result = 0;
  bool cannotFindMyself = false;

  auto const readFeature = [&](FeatureType & ft)
  {
    bool found = false;
    isRoad = routing::IsRoad(feature::TypesHolder(ft));
    if (!isRoad)
      return;

    auto const findPoint = [&result, &found, this](m2::PointD const & pt)
    {
      if (found)
        return;

      if (AlmostEqualAbs(m_data.m_center, pt, kCoordEqualityEps))
        found = true;
      else
        ++result;
    };

    ft.ForEachPoint(findPoint, scales::GetUpperScale());

    if (!found)
    {
      cannotFindMyself = true;
      return;
    }

    // If point with number - N, is end of feature, we cannot say: segmentId = N,
    // because number of segments is N - 1, so we say segmentId = N - 1, and coef = 1
    // which means, that camera placed at the end of (N - 1)'th segment.
    if (result + 1 == ft.GetPointsCount())
    {
      CHECK_NOT_EQUAL(result, 0, ("Feature consists of one point!"));
      --result;
      coef = 1.0;
    }
  };

  FeatureID featureID(mwmId, wayFeatureId);
  dataSource.ReadFeature(readFeature, featureID);

  if (cannotFindMyself)
  {
    // Note. Speed camera with coords |m_data.m_center| is not located at any point of |wayFeatureId|.
    // It may happens if osm feature corresponds to |wayFeatureId| is split by a mini_roundabout
    // or turning_loop. There are two cases:
    // * |m_data.m_center| is located at a point of another part of the whole osm feature. In
    //   that case it will be found on another call of FindMyself() method.
    // * |m_data.m_center| coincides with point of mini_roundabout or turning_loop. It means
    //   there on feature point which coincides with speed camera (|m_data.m_center|).