def __init__(self, geometry, period, **kwargs):
"""Creates a Periodic1DCylinder instance.
Keyword args:
shift_vector: Origin of the body.
radius: Radius of the cylinder.
"""
self.radius = kwargs.pop("radius")
self.periodicity = period
kwargs["radius1"] = self.radius
kwargs["radius2"] = self.radius
axis = period.get_axis("cartesian")[0]
axisnorm = np.linalg.norm(axis)
kwargs["point1"] = -axis / axisnorm * PERIODIC_TOLERANCE
kwargs["point2"] = axis + axis / axisnorm * PERIODIC_TOLERANCE
kwargs["point1_coordsys"] = "cartesian"
kwargs["point2_coordsys"] = "cartesian"
Cylinder.__init__(self, geometry, period, **kwargs)
