{

// Several last gps positions are accumulating in |PositionAccumulator::m_points|.

// The last position (the last point from |m_points|) may be removed if after the removing it

// the length of the all track will be more than |kMinTrackLengthM|.

static double constexpr kMinTrackLengthM = 70.0;

// All segments which are shorter than |kMinValidSegmentLengthM| are not added to the track.

static double constexpr kMinValidSegmentLengthM = 10.0;

// If a segment is longer then |kMaxValidSegmentLengthM|

// all the content of |m_points| is removed and the current point is added to track.

static double constexpr kMaxValidSegmentLengthM = 80.0;

void PushNextPoint(m2::PointD const & point);

void Clear();

/// \returns direction or {0.0, 0.0} if |m_points| is empty or contains only one item.

m2::PointD GetDirection() const;

// Getters for testing this class.

std::deque<m2::PointD> const & GetPointsForTesting() const { return m_points; }

double GetTrackLengthMForTesting() const { return m_trackLengthM; }

// There's the current position at the end. At the beginning there's the last position of the track.

// The distance between them is more or equal than |kMinTrackLengthM| if there're enough points in

// |m_points|.

std::deque<m2::PointD> m_points;

double m_trackLengthM = 0.0;