def test_sasa_two_spheres():
for samples, precision in [
(10, 5e0), # 5% accuracy
(50, 1e0), # 1% accuracy
(250, 1e-1), # 0.1% accuracy
(1000, 1e-2), # 0.01% accuracy
(5000, 1e-3), # 0.001% accuracy
]:
for _ in range(100):
a = XYZ(*(np.random.random(3) * 2 - 1))
b = XYZ(*(np.random.random(3) * 2 - 1))
r1, r2 = np.random.random(2) * 2 + 0.01
S1 = 4 * np.pi * r1 ** 2
S2 = 4 * np.pi * r2 ** 2
S1_loss = first_sphere_hidden_area(a, b, r1, r2)
S2_loss = first_sphere_hidden_area(b, a, r2, r1)
total_area = S1 + S2
exposed_area_exact = total_area - S1_loss - S2_loss
sasa = calc_sasa(VectorXYZ([a, b]), np.array([r1, r2]), 0, n_samples=samples)
exposed_area_approx = sum(sasa)
exposed_area_percent_exact = exposed_area_exact / total_area * 100
exposed_area_percent_approx = exposed_area_approx / total_area * 100
assert np.isclose(exposed_area_percent_exact,
exposed_area_percent_approx,
atol=precision)
def test_calc_mass_center():
from pyxmolpp2.geometry import calc_mass_center, XYZ, VectorXYZ, calc_rmsd, Rotation3d, Translation3d, Degrees
import numpy as np
a = VectorXYZ([XYZ(0, 1, 0), XYZ(1, 0, 0), XYZ(-1, 0, 0), XYZ(0, -1, 0)])
m = np.random.random((len(a), )).tolist()
x = calc_mass_center(a, m)
cm = sum([r * M for r, M in zip(a, m)], XYZ(0, 0, 0)) / np.sum(m)
assert (x - cm).len() == pytest.approx(0)
def test_construction():
a = XYZ()
b = XYZ(1, 2, 3)
c = a + b
assert c.x == 1
assert c.y == 2
assert c.z == 3
def test_calc_inertia_tensor():
from pyxmolpp2.geometry import calc_inertia_tensor, XYZ, VectorXYZ, calc_rmsd, Rotation3d, Translation3d, Degrees
import numpy as np
a = VectorXYZ([XYZ(0, 1, 0), XYZ(1, 0, 0), XYZ(-1, 0, 0), XYZ(0, -1, 0)])
x = calc_inertia_tensor(a)
assert np.allclose(x, np.diag([2, 2, 4]))
m = [10, 1, 1, 10]
x = calc_inertia_tensor(a, m)
assert np.allclose(x, np.diag([20, 2, 22]))
def test_AtomSelection_transformations():
from pyxmolpp2.geometry import Translation3d, XYZ
frame = make_polyglycine([("A", 20)])
ats = frame.asAtoms
for a in ats:
assert (a.r - XYZ(1,2,3)).len() == 0
transformation = Translation3d(XYZ(1,2,3))
ats.transform(transformation)
for a in ats:
assert (a.r - XYZ(2,4,6)).len() == 0
def test_operators():
import numpy as np
def as_np(xyz):
return np.array([xyz.x, xyz.y, xyz.z])
a = XYZ(5, 8, 1)
a.x, a.y, a.z = 9, 8, 7
assert a.x == 9
assert a.y == 8
assert a.z == 7
b = XYZ(1, 2, 3)
npa = as_np(a)
npb = as_np(b)
assert np.allclose(as_np(a + b), npa + npb)
assert np.allclose(as_np(-a), -npa)
assert np.allclose(as_np(a - b), npa - npb)
assert np.allclose(as_np(a * 7), npa * 7)
assert np.allclose(as_np(a / 7), npa / 7)
assert np.allclose(as_np(7 * a), 7 * npa)
assert np.allclose((a.dot(b)), np.dot(npa, npb))
assert np.allclose(a.len(), np.linalg.norm(npa))
assert np.allclose(a.len2(), np.linalg.norm(npa)**2)
assert np.allclose(as_np(a.cross(b)), np.cross(npa, npb))
def test_vectorXYZ_transformations():
v = VectorXYZ([XYZ(0, 0, 0), XYZ(1, 1, 1)])
v.transform(Translation3d(XYZ(2, 2, 2)))
for (a, b) in zip(v, VectorXYZ([XYZ(2, 2, 2), XYZ(3, 3, 3)])):
assert (a - b).len() == 0
v.transform(Translation3d(XYZ(2, 2, 2)))
v.transform(
Transformation3d(Rotation3d(XYZ(1, 1, 1), Degrees(30)),
Translation3d(XYZ(2, 2, 2))))
v.transform(Rotation3d(XYZ(1, 1, 1), Degrees(30)))
v.transform(UniformScale3d(5))
def test_calc_geom_center_exception():
from pyxmolpp2.geometry import calc_geom_center, XYZ, VectorXYZ, calc_rmsd, GeometryException, Transformation3d
with pytest.raises(GeometryException):
calc_geom_center(VectorXYZ([]))
calc_geom_center(VectorXYZ([XYZ(1, 2, 3)]))
def test_autocorr():
from pyxmolpp2.geometry import XYZ, VectorXYZ, calc_autocorr_order_2
from numpy.random import random as rnd
from timeit import default_timer as timer
n = 1000
v = VectorXYZ([XYZ(rnd(), rnd(), rnd()) for i in range(n)])
v2 = [x.to_np for x in v]
start = timer()
cpp = calc_autocorr_order_2(v)
end = timer()
cpp_time = end - start
start = timer()
py = autocorr_all_harmonics(v2)
end = timer()
py_time = end - start
py2 = autocorr_all_harmonics5(v2)
assert np.max(np.abs([a - b for a, b in zip(cpp, py)])) < 1e-9
assert np.max(np.abs([a - b for a, b in zip(py2, py)])) < 1e-9
assert pytest.approx(1) == cpp[0]
print("Time(c++) = %f" % cpp_time)
print("Time(py) = %f" % py_time)
print("Speedup = %g%%" % (py_time / cpp_time * 100))
def make_polyglycine( chain_lengths, no_reserve=True):
from pyxmolpp2.polymer import Frame
from pyxmolpp2.polymer import ChainName
from pyxmolpp2.polymer import AtomName
from pyxmolpp2.polymer import ResidueName, ResidueId
from pyxmolpp2.geometry import XYZ
aid=1
rid=1
frame = Frame(0)
for chainId, N in chain_lengths:
if no_reserve:
c = frame.emplace(ChainName(chainId))
else:
c = frame.emplace(ChainName(chainId),N)
for i in range(N):
if no_reserve:
r = c.emplace(ResidueName("GLY"),ResidueId(rid))
else:
r = c.emplace(ResidueName("GLY"),ResidueId(rid),7)
rid+=1
for aname in ["N","H","CA","HA2","HA3","C","O"]:
r.emplace(AtomName(aname),aid,XYZ(1,2,3))
aid+=1
return frame
def test_conversion():
import numpy as np
def as_np(xyz):
return np.array([xyz.x, xyz.y, xyz.z])
a = XYZ(5, 8, 1)
assert np.allclose(a.to_np, as_np(a))
def test_composition():
from pyxmolpp2.geometry import calc_alignment, XYZ, VectorXYZ, calc_rmsd, Rotation3d, Translation3d, Degrees, UniformScale3d
R = Rotation3d(XYZ(1, 1, 1), Degrees(39))
T = Translation3d(XYZ(7, 1, 2))
S = UniformScale3d(1.5)
G = R * T * S * R * T
def check(G):
r = XYZ(5, 6, 4)
assert ((G * G.inverted()).transform(r) - r).len() == pytest.approx(0)
check(R)
check(T)
check(S)
check(G)
for a in [R, T, S, G]:
for b in [R, T, S, G]:
check(a * b)
def test_transformation_3d():
import numpy as np
from pyxmolpp2.geometry import calc_alignment, XYZ, VectorXYZ, calc_rmsd, Rotation3d, Translation3d, Degrees, UniformScale3d
R = Rotation3d(XYZ(1, 0, 0), Degrees(45))
T = Translation3d(XYZ(1, 2, 5))
G = T * R
m = G.matrix3d()
v = G.vector3d()
assert pytest.approx(m[0, 0]) == 1
assert pytest.approx(m[0, 1]) == 0
assert pytest.approx(m[0, 2]) == 0
assert pytest.approx(np.sqrt(2) / 2) == m[2, 1]
assert v.x == 1
assert v.y == 2
assert v.z == 5
def test_Atom_setters():
from pyxmolpp2.polymer import AtomName
from pyxmolpp2.geometry import XYZ
frame = make_polyglycine([("A", 1)])
a = frame.asAtoms[0]
a.name = AtomName("X")
assert a.name == AtomName("X")
a.aName = AtomName("Y")
assert a.aName == AtomName("Y")
a.id = 5
assert a.id == 5
a.aId = 7
assert a.aId == 7
a.r = XYZ(9,9,9)
assert (a.r - XYZ(9,9,9)).len() == 0
def test_alignment_exception():
from pyxmolpp2.geometry import calc_alignment, XYZ, VectorXYZ, calc_rmsd, AlignmentError
a = [XYZ(1, 2, 3)] * 10
with pytest.raises(AlignmentError):
calc_alignment(VectorXYZ(a[:2]), VectorXYZ(a[:2]))
calc_alignment(VectorXYZ(a[:3]), VectorXYZ(a[:3]))
with pytest.raises(AlignmentError):
calc_alignment(VectorXYZ(a[:4]), VectorXYZ(a))
def test_dihedral():
from pyxmolpp2.geometry import XYZ, dihedral_angle
a = XYZ(1,0,0)
b = XYZ(0,0,0)
c = XYZ(0,0,1)
d = XYZ(0,1,1)
assert dihedral_angle(a,b,c,d).degrees == pytest.approx(90)
a = XYZ(1,0,0)
b = XYZ(0,0,0)
c = XYZ(0,0,1)
d = XYZ(1,1,1)
assert dihedral_angle(a,b,c,d).degrees == pytest.approx(45)
def test_sasa_three_spheres():
for samples, precision in [
(10, 5e0), # 5% accuracy
(50, 1e0), # 1% accuracy
(250, 1e-1), # 0.1% accuracy
(1000, 1e-2), # 0.01% accuracy
(5000, 1e-3), # 0.001% accuracy
]:
for _ in range(100):
r1, r2, r3 = np.random.random(3) * 2 + 0.01
a = XYZ(*(np.random.random(3) * 2 - 1))
b = XYZ(*(np.random.random(3) * 2 - 1))
v = XYZ(*np.random.random(3))
v /= v.len()
c = a + v * (r1 + r3)
S1 = 4 * np.pi * r1 ** 2
S2 = 4 * np.pi * r2 ** 2
S3 = 4 * np.pi * r3 ** 2
S1_loss = first_sphere_hidden_area(a, b, r1, r2) + first_sphere_hidden_area(a, c, r1, r3)
S2_loss = first_sphere_hidden_area(b, a, r2, r1) + first_sphere_hidden_area(b, c, r2, r3)
S3_loss = first_sphere_hidden_area(c, a, r3, r1) + first_sphere_hidden_area(c, b, r3, r2)
total_area = S1 + S2 + S3
exposed_area_exact = total_area - S1_loss - S2_loss - S3_loss
sasa = calc_sasa(VectorXYZ([a, b, c]), np.array([r1, r2, r3]), 0, n_samples=samples)
exposed_area_approx = sum(sasa)
exposed_area_percent_exact = exposed_area_exact / total_area * 100
exposed_area_percent_approx = exposed_area_approx / total_area * 100
assert np.isclose(exposed_area_percent_exact,
exposed_area_percent_approx,
atol=precision), (exposed_area_percent_exact,
exposed_area_percent_approx,)
def test_calc_rmsd():
from pyxmolpp2.geometry import XYZ, AngleValue
from pyxmolpp2.crystal import LatticeVectors, BestShiftFinder
latticeVectors = LatticeVectors(XYZ(1, 4, 1), XYZ(5, 1, 1), XYZ(7, 1, 4))
bestShiftFinder = BestShiftFinder(latticeVectors)
latticeVectors.scale_by(0.5)
bestShiftFinder.scale_lattice_by(0.5)
ref = XYZ(0, 0, 0)
var = latticeVectors.translate(ref, 1, 4, 43)
# print()
# print(var.x,var.y,var.z)
dr, shift = bestShiftFinder.find_best_shift(ref, var)
# print(shift.x,shift.y,shift.z)
var = var + shift
assert var.x == pytest.approx(ref.x)
assert var.y == pytest.approx(ref.y)
assert var.z == pytest.approx(ref.z)
assert dr == pytest.approx(0)
def test_calc_alignment():
from pyxmolpp2.geometry import calc_alignment, XYZ, VectorXYZ, calc_rmsd, Rotation3d, Translation3d, Degrees
a = VectorXYZ([XYZ(1, 2, 3), XYZ(1, 2, 5), XYZ(4, 2, 7), XYZ(8, 1, 4)])
G = Rotation3d(XYZ(7, 6, 5), Degrees(12)) * Translation3d(XYZ(8, -9, 1))
b = VectorXYZ([G.transform(x) for x in a])
G2 = calc_alignment(a, b)
assert calc_rmsd(a, b) > 1
assert calc_rmsd(a, b, G2) == pytest.approx(0)
def test_calc_rmsd_exception():
from pyxmolpp2.geometry import calc_alignment, XYZ, VectorXYZ, calc_rmsd, GeometryException, Transformation3d
a = VectorXYZ([])
with pytest.raises(GeometryException):
calc_rmsd(a, a)
with pytest.raises(GeometryException):
calc_rmsd(a, a, Transformation3d())
a = [XYZ(1, 2, 3)] * 10
with pytest.raises(GeometryException):
calc_rmsd(VectorXYZ(a[:4]), VectorXYZ(a))
with pytest.raises(GeometryException):
calc_rmsd(VectorXYZ(a[:4]), VectorXYZ(a), Transformation3d())
def test_calc_rmsd():
from pyxmolpp2.geometry import calc_alignment, XYZ, VectorXYZ, calc_rmsd
a = VectorXYZ([XYZ(1, 2, 3)])
b = VectorXYZ([XYZ(3, 4, 5)])
assert calc_rmsd(a, b) == pytest.approx(math.sqrt(2**2 * 3))
a = VectorXYZ([XYZ(1, 2, 3), XYZ(1, 2, 3)])
b = VectorXYZ([XYZ(3, 4, 5), XYZ(1, 2, 3)])
assert calc_rmsd(a, b) == pytest.approx(math.sqrt(2**2 * 3 * 0.5))
def test_angle():
from pyxmolpp2.geometry import XYZ, angle
a = XYZ(0,0,1)
b = XYZ(0,0,0)
c = XYZ(1,0,0)
assert angle(a,b,c).degrees == pytest.approx(90)
a = XYZ(0,0,1)
b = XYZ(0,0,0)
c = XYZ(1,0,1)
assert angle(a,b,c).degrees == pytest.approx(45)
def test_vectorXYZ_numpy_conversions():
from timeit import default_timer as timer
vectors = np.random.random((10000, 3))
start = timer()
v1 = VectorXYZ([XYZ(x, y, z) for x, y, z in vectors])
end = timer()
t1 = end - start
start = timer()
v2 = VectorXYZ.from_numpy(vectors)
end = timer()
t2 = end - start
print("Time(py) = %f" % t1)
print("Time(c++) = %f" % t2)
print("Speedup = %g%%" % (t1 / t2 * 100))
assert np.allclose(vectors, v2.to_numpy())
def test_rotation_decomposition():
import numpy as np
from pyxmolpp2.geometry import XYZ, Rotation3d, Degrees
for ax, theta in [
(XYZ(0, 0, 1), Degrees(30)),
(XYZ(0, 0, 1), Degrees(70)),
(XYZ(0, 1, 0), Degrees(70)),
(XYZ(1, 0, 0), Degrees(70)),
(XYZ(1, 1, 0), Degrees(70)),
(XYZ(1, 1, 1), Degrees(70)),
(XYZ(1, 0, 1), Degrees(0)),
(XYZ(1, 1, 1), Degrees(0)),
]:
R = Rotation3d(ax, theta)
ax1, theta1 = R.axis(), R.theta()
R2 = Rotation3d(ax1, theta1)
assert np.allclose(R.matrix3d(), R2.matrix3d()), ("\n".join(
map(lambda x: "%25.18e" % x,
(R.matrix3d() - R2.matrix3d()).flatten())))
def test_Frame():
from pyxmolpp2.polymer import Frame
from pyxmolpp2.polymer import ChainName
from pyxmolpp2.polymer import AtomName
from pyxmolpp2.polymer import ResidueName, ResidueId
from pyxmolpp2.geometry import XYZ
f = Frame(5)
c = f.emplace(ChainName("A"), 1)
r = c.emplace(ResidueName("LYS"), ResidueId(1))
a = r.emplace(AtomName("CA"), 1, XYZ(1,2,3))
assert a.residue == r
assert a.chain == c
assert a.frame == f
assert r.asAtoms[0] == a
assert c.asAtoms[0] == a
assert f.asAtoms[0] == a
assert r.asAtoms.asResidues[0] == r
assert c.asAtoms.asResidues[0] == r
assert f.asAtoms.asResidues[0] == r
assert r.asAtoms.asResidues.asChains[0] == c
assert c.asAtoms.asResidues.asChains[0] == c
assert f.asAtoms.asResidues.asChains[0] == c
assert r.chain == c
assert r.frame == f
assert c.frame == f
assert c.asResidues[0] == r
assert f.asResidues[0] == r
assert f.asChains[0] == c
def test_shorthands():
import numpy as np
from pyxmolpp2.geometry import Rotation3d, Translation3d, XYZ, Degrees, calc_alignment
frame = make_polyglycine([("A", 20)])
for a in frame.asAtoms:
a.r = XYZ(*np.random.random(3))
frame2 = frame.copy()
asel = frame.asAtoms
asel2 = frame2.asAtoms
asel.geom_center()
asel.mass_center([1.0] * asel.size)
asel.inertia_tensor([1.0] * asel.size)
asel.geom_inertia_tensor()
T = Translation3d(XYZ(1, 0, 0))
asel2.transform(T)
assert np.isclose(asel.rmsd(asel2), 1.0)
assert np.isclose(asel.rmsd(asel2.toCoords), 1.0)
assert np.isclose(asel.rmsd(asel2.toCoords.transform(T.inverted())), 0.0)
T = Translation3d(XYZ(1, 0, 0)) * Rotation3d(XYZ(1, 1, 1), Degrees(45))
asel.align_to(asel2)
assert np.isclose(asel.rmsd(asel2), 0)
asel2.transform(T)
asel.align_to(asel2.toCoords)
assert np.isclose(asel.rmsd(asel2), 0)
T = Translation3d(XYZ(1, 0, 0)) * Rotation3d(XYZ(1, 1, 1), Degrees(45))
asel2.transform(T)
assert np.allclose(T.matrix3d(), calc_alignment(asel2.toCoords, asel.toCoords).matrix3d())
assert np.allclose(T.matrix3d(), asel.alignment_to(asel2).matrix3d())
assert np.allclose(T.matrix3d(), asel.alignment_to(asel2.toCoords).matrix3d())
def check(G):
r = XYZ(5, 6, 4)
assert ((G * G.inverted()).transform(r) - r).len() == pytest.approx(0)
def test_distance():
from pyxmolpp2.geometry import XYZ, distance
a = XYZ(1,2,3)
b = XYZ(4,5,6)
assert distance(a,b) == pytest.approx(math.sqrt((3**2 * 3)))
def translate_by_dr(a):
#print(a,a.r)
a.r = a.r+XYZ(1,2,3)
