Method OnSetCenter

libs/drape_frontend/user_event_stream.cpp:417–450

}

bool UserEventStream::OnSetCenter(ref_ptr<SetCenterEvent> centerEvent)
{
  m2::PointD const & center = centerEvent->GetCenter();
  auto const zoom = centerEvent->GetZoom();
  auto const scaleFactor = centerEvent->GetScaleFactor();

  if (centerEvent->TrackVisibleViewport())
  {
    m_needTrackCenter = true;
    m_trackedCenter = center;
  }

  ScreenBase screen = GetCurrentScreen();

  if (zoom != kDoNotChangeZoom)
  {
    screen.SetFromParams(center, screen.GetAngle(), GetScreenScale(zoom));
    screen.MatchGandP3d(center, m_visibleViewport.Center());
  }
  else if (scaleFactor > 0.0)
  {
    screen.SetOrg(center);
    ApplyScale(m_visibleViewport.Center(), scaleFactor, screen);
  }
  else
  {
    GetTargetScreen(screen);
    screen.MatchGandP3d(center, m_visibleViewport.Center());
  }

  ShrinkAndScaleInto(screen, df::GetWorldRect());

  return SetScreen(screen, centerEvent->IsAnim(), centerEvent->GetParallelAnimCreator());
}

bool UserEventStream::OnRotate(ref_ptr<RotateEvent> rotateEvent)
{