Method CacheRouteArrows

libs/drape_frontend/route_renderer.cpp:281–307

}

void RouteRenderer::CacheRouteArrows(ScreenBase const & screen, dp::DrapeID subrouteId,
                                     std::vector<ArrowBorders> && arrowBorders,
                                     CacheRouteArrowsCallback const & cacheCallback)
{
  ASSERT(cacheCallback != nullptr, ());
  auto const it = FindSubroute(m_subroutes, subrouteId);
  if (it == m_subroutes.end())
    return;

  auto & subrouteInfo = *it;

  double zoom = 0.0;
  float halfWidth = 0.0;
  InterpolateByZoom(subrouteInfo.m_subroute, screen, halfWidth, zoom);

  if (arrowBorders.empty() || zoom < kArrowAppearingZoomLevel)
  {
    // Clear arrows.
    subrouteInfo.m_arrowsData.reset();
    subrouteInfo.m_arrowBorders.clear();
  }
  else if (!AreEqualArrowBorders(arrowBorders, subrouteInfo.m_arrowBorders))
  {
    subrouteInfo.m_arrowBorders = std::move(arrowBorders);
    cacheCallback(subrouteInfo.m_subrouteId, subrouteInfo.m_arrowBorders);
  }
}

void RouteRenderer::UpdatePreview(ScreenBase const & screen)
{