Function CreateDrapeSubroute

libs/map/routing_manager.cpp:240–325

}

drape_ptr<df::Subroute> CreateDrapeSubroute(vector<RouteSegment> const & segments, m2::PointD const & startPt,
                                            double baseDistance, double baseDepth, routing::RouterType routerType)
{
  auto subroute = make_unique_dp<df::Subroute>();
  subroute->m_baseDistance = baseDistance;
  subroute->m_baseDepthIndex = baseDepth;

  auto constexpr kBias = 1.0;

  if (routerType == RouterType::Transit)
  {
    subroute->m_headFakeDistance = -kBias;
    subroute->m_tailFakeDistance = kBias;
    subroute->m_polyline.Add(startPt);
    return subroute;
  }

  vector<m2::PointD> points;
  points.reserve(segments.size() + 1);
  points.push_back(startPt);
  for (auto const & s : segments)
    points.push_back(s.GetJunction().GetPoint());

  if (points.size() < 2)
  {
    LOG(LWARNING, ("Invalid subroute. Points number =", points.size()));
    return nullptr;
  }

  if (routerType == RouterType::Ruler)
  {
    auto const subrouteLen = segments.back().GetDistFromBeginningMerc() - baseDistance;
    subroute->m_headFakeDistance = -kBias;
    subroute->m_tailFakeDistance = subrouteLen + kBias;
    subroute->m_polyline = m2::PolylineD(std::move(points));
    return subroute;
  }

  // We support visualization of fake edges only in the head and in the tail of subroute.
  auto constexpr kInvalidId = std::numeric_limits<size_t>::max();
  auto firstReal = kInvalidId;
  auto lastReal = kInvalidId;
  for (size_t i = 0; i < segments.size(); ++i)
  {
    if (!segments[i].GetSegment().IsRealSegment())
      continue;

    if (firstReal == kInvalidId)
      firstReal = i;
    lastReal = i;
  }

  if (firstReal == kInvalidId)
  {
    // All segments are fake.
    subroute->m_headFakeDistance = 0.0;
    subroute->m_tailFakeDistance = 0.0;
  }