def test_resample_astrocyte_section__double_density():
"""If we have points 1um apart with a density of 1 points per um
then the result should the same as the input.
"""
section = Mock(
points=np.array([[0., 0., 0.], [1., 0., 0.], [2., 0., 0.]]),
diameters=np.array([3., 2., 1.]),
perimeters=np.array([1., 2., 3.])
)
tested._resample_astrocyte_section(section, linear_density=2.)
npt.assert_allclose(
section.points,
[[0.0, 0., 0.],
[0.5, 0., 0.],
[1.0, 0., 0.],
[1.5, 0., 0.],
[2.0, 0., 0.]])
npt.assert_allclose(section.diameters, [3., 2.5, 2., 1.5, 1.])
npt.assert_allclose(section.perimeters, [1., 1.5, 2., 2.5, 3.])
# let's do a full cycle now!
tested._resample_astrocyte_section(section, linear_density=1.)
npt.assert_allclose(
section.points,
[[0.0, 0., 0.],
[1.0, 0., 0.],
[2.0, 0., 0.]])
npt.assert_allclose(section.diameters, [3., 2., 1.])
npt.assert_allclose(section.perimeters, [1., 2., 3.])
def test_resample_astrocyte_section_strip():
"""Check that only the first and last points and diameters remain
if linear_density is zero.
"""
section = Mock(points=np.array([[0., 0., 0.], [1., 1., 1.], [2., 2., 2.]]),
diameters=np.array([3., 2., 1.]),
perimeters=np.array([1., 2., 3.]))
tested._resample_astrocyte_section(section, linear_density=0.)
npt.assert_allclose(section.points, [[0., 0., 0.], [2., 2., 2.]])
npt.assert_allclose(section.diameters, [3., 1.])
npt.assert_allclose(section.perimeters, [1., 3.])