How to use the geographiclib.geodesicline.GeodesicLine function in geographiclib

def _GenDirect(self, lat1, lon1, azi1, arcmode, s12_a12, outmask):
    """Private: General version of direct problem"""
    from geographiclib.geodesicline import GeodesicLine
    # Automatically supply DISTANCE_IN if necessary
    if not arcmode: outmask |= Geodesic.DISTANCE_IN
    line = GeodesicLine(self, lat1, lon1, azi1, outmask)
    return line._GenPosition(arcmode, s12_a12, outmask)

def _GenDirectLine(self, lat1, lon1, azi1, arcmode, s12_a12,
                     caps = GeodesicCapability.STANDARD |
                     GeodesicCapability.DISTANCE_IN):
    """Private: general form of DirectLine"""
    from geographiclib.geodesicline import GeodesicLine
    # Automatically supply DISTANCE_IN if necessary
    if not arcmode: caps |= Geodesic.DISTANCE_IN
    line = GeodesicLine(self, lat1, lon1, azi1, caps)
    if arcmode:
      line.SetArc(s12_a12)
    else:
      line.SetDistance(s12_a12)
    return line

:return: a :class:`~geographiclib.geodesicline.GeodesicLine`

    This function sets point 3 of the GeodesicLine to correspond to
    point 2 of the inverse geodesic problem.  The default value of *caps*
    is STANDARD | DISTANCE_IN, allowing direct geodesic problem to be
    solved.

    """

    from geographiclib.geodesicline import GeodesicLine
    a12, _, salp1, calp1, _, _, _, _, _, _ = self._GenInverse(
      lat1, lon1, lat2, lon2, 0)
    azi1 = Math.atan2d(salp1, calp1)
    if caps & (Geodesic.OUT_MASK & Geodesic.DISTANCE_IN):
      caps |= Geodesic.DISTANCE
    line = GeodesicLine(self, lat1, lon1, azi1, caps, salp1, calp1)
    line.SetArc(a12)
    return line

def _GenDirectLine(self, lat1, lon1, azi1, arcmode, s12_a12,
                     caps = GeodesicCapability.STANDARD |
                     GeodesicCapability.DISTANCE_IN):
    """Private: general form of DirectLine"""
    from geographiclib.geodesicline import GeodesicLine
    # Automatically supply DISTANCE_IN if necessary
    if not arcmode: caps |= Geodesic.DISTANCE_IN
    line = GeodesicLine(self, lat1, lon1, azi1, caps)
    if arcmode:
      line.SetArc(s12_a12)
    else:
      line.SetDistance(s12_a12)
    return line

def _GenDirect(self, lat1, lon1, azi1, arcmode, s12_a12, outmask):
    """Private: General version of direct problem"""
    from geographiclib.geodesicline import GeodesicLine
    # Automatically supply DISTANCE_IN if necessary
    if not arcmode: outmask |= Geodesic.DISTANCE_IN
    line = GeodesicLine(self, lat1, lon1, azi1, outmask)
    return line._GenPosition(arcmode, s12_a12, outmask)

:param lat1: latitude of the first point in degrees
    :param lon1: longitude of the first point in degrees
    :param azi1: azimuth at the first point in degrees
    :param caps: the :ref:`capabilities `
    :return: a :class:`~geographiclib.geodesicline.GeodesicLine`

    This allows points along a geodesic starting at (*lat1*, *lon1*),
    with azimuth *azi1* to be found.  The default value of *caps* is
    STANDARD | DISTANCE_IN, allowing direct geodesic problem to be
    solved.

    """

    from geographiclib.geodesicline import GeodesicLine
    return GeodesicLine(self, lat1, lon1, azi1, caps)

:return: a :class:`~geographiclib.geodesicline.GeodesicLine`

    This function sets point 3 of the GeodesicLine to correspond to
    point 2 of the inverse geodesic problem.  The default value of *caps*
    is STANDARD | DISTANCE_IN, allowing direct geodesic problem to be
    solved.

    """

    from geographiclib.geodesicline import GeodesicLine
    a12, _, salp1, calp1, _, _, _, _, _, _ = self._GenInverse(
      lat1, lon1, lat2, lon2, 0)
    azi1 = Math.atan2d(salp1, calp1)
    if caps & (Geodesic.OUT_MASK & Geodesic.DISTANCE_IN):
      caps |= Geodesic.DISTANCE
    line = GeodesicLine(self, lat1, lon1, azi1, caps, salp1, calp1)
    line.SetArc(a12)
    return line

Geodesic.LATITUDE
      Geodesic.LONGITUDE
      Geodesic.AZIMUTH
      Geodesic.DISTANCE
      Geodesic.REDUCEDLENGTH
      Geodesic.GEODESICSCALE
      Geodesic.AREA
      Geodesic.DISTANCE_IN
      Geodesic.ALL
    """

    from geographiclib.geodesicline import GeodesicLine
    lon1 = Geodesic.CheckPosition(lat1, lon1)
    azi1 = Geodesic.CheckAzimuth(azi1)
    return GeodesicLine(
      self, lat1, lon1, azi1,
      # Automatically supply DISTANCE_IN
      caps | Geodesic.DISTANCE_IN)