Method ProcessRoundabouts

generator/mini_roundabout_transformer.cpp:186–283

}

void MiniRoundaboutTransformer::ProcessRoundabouts(std::function<void(feature::FeatureBuilder const &)> const & fn)
{
  // Some mini-roundabouts are mapped in the middle of the road. These roads should be split
  // in two parts on the opposite sides of the roundabout. New roads are saved in |fbsRoads|.
  std::vector<feature::FeatureBuilder> fbsRoads;
  size_t constexpr kReserveSize = 4 * 1024;
  fbsRoads.reserve(kReserveSize);

  size_t transformed = 0;
  for (auto const & rb : m_roundabouts)
  {
    bool allRoadsInOneMwm = true;

    // First of all collect Ways-Features and make sure that they are _transformable_. Do nothing otherwise.
    std::vector<std::pair<feature::FeatureBuilder *, uint64_t>> features;
    for (uint64_t const wayId : rb.m_ways)
    {
      base::GeoObjectId const geoWayId = base::MakeOsmWay(wayId);
      auto const it = m_roads.find(geoWayId);
      if (it == m_roads.end())
        continue;

      feature::FeatureBuilder & fb = it->second;

      // Transform only mini_roundabouts on roads contained in single mwm.
      // They will overlap and break a picture, otherwise.
      if (m_affiliation->GetAffiliations(fb).size() != 1)
      {
        LOG(LWARNING, ("Roundabout's connected way in many MWMs", geoWayId, rb.m_id));
        allRoadsInOneMwm = false;
        break;
      }
      else
        features.emplace_back(&fb, wayId);
    }
    if (!allRoadsInOneMwm)
      continue;

    m2::PointD const center = mercator::FromLatLon(rb.m_coord);
    PointsT circlePlain = PointToPolygon(center, m_radiusMercator);
    uint32_t roadType = 0;
    bool foundRoad = false;

    for (auto [feature, wayId] : features)
    {
      base::GeoObjectId const geoWayId = base::MakeOsmWay(wayId);
      auto road = feature->GetOuterGeometry();

      if (GetIterOnRoad(center, road) == road.end())
      {
        feature = nullptr;
        for (auto & rd : fbsRoads)
        {
          if (rd.GetMostGenericOsmId() == geoWayId)
          {
            road = rd.GetOuterGeometry();
            if (GetIterOnRoad(center, road) != road.end())
            {