def test_to_from_polygon():
"""Test the from_polygon method."""
pts_1 = (Point2D(0, 0), Point2D(2, 0), Point2D(2, 2), Point2D(0, 2))
pline2d = Polyline2D(pts_1, interpolated=True)
pline = Polyline3D.from_polyline2d(pline2d)
assert isinstance(pline, Polyline3D)
assert len(pline) == 4
assert pline.interpolated
new_pline2d = pline.to_polyline2d()
assert isinstance(new_pline2d, Polyline2D)
assert len(new_pline2d) == 4
assert new_pline2d.interpolated
def chart_border3d(self):
"""Get a Polyline3D for the border of the plot."""
plane = Plane(o=Point3D(0, 0, self._base_point.z))
return Polyline3D.from_polyline2d(self.chart_border2d, plane)
