Function GetPrettyFollowAnimation

libs/drape_frontend/screen_animations.cpp:71–113

}

drape_ptr<SequenceAnimation> GetPrettyFollowAnimation(ScreenBase const & startScreen, m2::PointD const & userPos,
                                                      double targetScale, double targetAngle,
                                                      m2::PointD const & endPixelPos)
{
  auto sequenceAnim = make_unique_dp<SequenceAnimation>();
  sequenceAnim->SetCustomType(kPrettyFollowAnim);

  m2::RectD const viewportRect = startScreen.PixelRectIn3d();

  ScreenBase tmp = startScreen;
  tmp.SetAngle(targetAngle);
  tmp.MatchGandP3d(userPos, viewportRect.Center());

  double const moveDuration = PositionInterpolator::GetMoveDuration(startScreen.GetOrg(), tmp.GetOrg(), startScreen);
  ASSERT_GREATER(moveDuration, 0.0, ());

  double const scaleFactor = moveDuration / kMaxAnimationTimeSec * 2.0;

  tmp = startScreen;

  if (moveDuration > 0.0)
  {
    tmp.SetScale(startScreen.GetScale() * scaleFactor);

    auto zoomOutAnim = make_unique_dp<MapLinearAnimation>();
    zoomOutAnim->SetScale(startScreen.GetScale(), tmp.GetScale());
    zoomOutAnim->SetMaxDuration(kMaxAnimationTimeSec * 0.5);
    sequenceAnim->AddAnimation(std::move(zoomOutAnim));

    tmp.MatchGandP3d(userPos, viewportRect.Center());

    auto moveAnim = make_unique_dp<MapLinearAnimation>();
    moveAnim->SetMove(startScreen.GetOrg(), tmp.GetOrg(), viewportRect, tmp.GetScale());
    moveAnim->SetMaxDuration(kMaxAnimationTimeSec);
    sequenceAnim->AddAnimation(std::move(moveAnim));
  }

  auto followAnim =
      make_unique_dp<MapFollowAnimation>(tmp, userPos, endPixelPos, targetScale, targetAngle, false /* isAutoZoom */);
  followAnim->SetMaxDuration(kMaxAnimationTimeSec * 0.5);
  sequenceAnim->AddAnimation(std::move(followAnim));
  return sequenceAnim;
}

drape_ptr<MapLinearAnimation> GetRectAnimation(ScreenBase const & startScreen, ScreenBase const & endScreen)
{