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#!/usr/bin/env python
import math
import sys
import unittest
import zlib
import gemmi
from common import full_path, get_path_for_tempfile, assert_numpy_equal, numpy
class TestFloatGrid(unittest.TestCase):
def test_reading(self):
m = gemmi.read_ccp4_map(full_path('5i55_tiny.ccp4'))
self.assertEqual(m.grid.nu, 8)
self.assertEqual(m.grid.nv, 6)
self.assertEqual(m.grid.nw, 10)
self.assertEqual(m.header_i32(28), 0)
m.set_header_i32(28, 20140) # set NVERSION
self.assertEqual(m.header_i32(28), 20140)
dmax = m.header_float(21)
self.assertEqual(dmax, max(p.value for p in m.grid))
self.assertNotEqual(m.grid.axis_order, gemmi.AxisOrder.XYZ)
m.setup(float('nan'))
self.assertEqual(m.grid.axis_order, gemmi.AxisOrder.XYZ)
self.assertEqual(m.grid.nu, 60)
self.assertEqual(m.grid.nv, 24)
self.assertEqual(m.grid.nw, 60)
self.assertEqual(m.grid.point_count, 60 * 24 * 60)
self.assertEqual(m.header_float(14), 90.0) # 14 - alpha angle
self.assertEqual(m.grid.unit_cell.alpha, 90.0)
self.assertEqual(m.grid.spacegroup.ccp4, 4) # P21
extent = m.get_extent()
self.assertEqual(extent.minimum.tolist(), [-1e-9]*3)
nu = m.grid.nu
self.assertTrue((nu - 1.) / nu < extent.maximum.x < 1)
pos = gemmi.Position(19.4, 3., 21.)
frac = m.grid.unit_cell.fractionalize(pos)
pos_value = 2.1543798446655273
self.assertAlmostEqual(m.grid.interpolate_value(pos), pos_value)
self.assertAlmostEqual(m.grid.interpolate_value(frac), pos_value)
# this spacegroup has symop -x, y+1/2, -z
m.grid.set_value(60-3, 24//2+4, 60-5, 100) # image of (3, 4, 5)
self.assertEqual(m.grid.get_value(60-3, 24//2+4, 60-5), 100)
self.assertTrue(math.isnan(m.grid.get_value(3, 4, 5)))
m.grid.symmetrize_max()
self.assertEqual(m.grid.get_value(3, 4, 5), 100)
m.grid.set_value(3, 4, 5, float('nan'))
self.assertTrue(math.isnan(m.grid.get_value(3, 4, 5)))
m.grid.symmetrize_min()
self.assertEqual(m.grid.get_value(3, 4, 5), 100)
m.grid.set_value(60-3, 24//2+4, 60-5, 80)
m.grid.symmetrize_avg()
self.assertEqual(m.grid.get_value(3, 4, 5), 90)
m.grid.set_value(60-3, 24//2+4, 60-5, float('nan'))
m.grid.symmetrize_max()
self.assertEqual(m.grid.get_value(60-3, 24//2+4, 60-5), 90)
if numpy:
arr = numpy.array(m.grid, copy=False)
self.assertEqual(arr.shape, (60, 24, 60))
self.assertEqual(arr[3][4][5], 90)
grid2 = gemmi.FloatGrid(arr)
self.assertTrue(numpy.allclose(m.grid, grid2, atol=0.0, rtol=0,
equal_nan=True))
def test_new(self):
N = 24
m = gemmi.FloatGrid(N, N, N)
self.assertEqual(m.nu, N)
self.assertEqual(m.nv, N)
self.assertEqual(m.nw, N)
m.set_value(1,2,3, 1.0)
self.assertEqual(m.sum(), 1.0)
m.spacegroup = gemmi.find_spacegroup_by_name('C2')
self.assertEqual(m.spacegroup.number, 5)
m.symmetrize_max()
self.assertEqual(m.sum(), 4.0)
m.get_point(0, 0, 0).value += 1
self.assertEqual(m.sum(), 5.0)
m.fill(2.0)
m.spacegroup = gemmi.find_spacegroup_by_name('P 62 2 2')
self.assertEqual(len(m.spacegroup.operations()), 12)
m.set_value(1, 2, 3, 0.0)
m.symmetrize_min()
self.assertEqual(m.sum(), 2 * N * N * N - 2 * 12)
class TestCcp4Map(unittest.TestCase):
@unittest.skipIf(numpy is None, "NumPy not installed.")
def test_567_map(self):
# make a small, contrived map
data = numpy.arange(5*6*7, dtype=numpy.float32).reshape((5,6,7))
cell = gemmi.UnitCell(150, 132, 140, 90, 90, 90)
m = gemmi.Ccp4Map()
m.grid = gemmi.FloatGrid(data, cell, gemmi.SpaceGroup('P 1'))
m.update_ccp4_header()
# write, read and compare
tmp_path = get_path_for_tempfile(suffix='.ccp4')
m.write_ccp4_map(tmp_path)
with open(tmp_path, 'rb') as f:
crc_mod_2_32 = zlib.crc32(f.read()) % 4294967296
if sys.byteorder == 'little':
self.assertEqual(crc_mod_2_32, 4078044323)
elif sys.byteorder == 'big':
self.assertEqual(crc_mod_2_32, 372922578)
box = gemmi.FractionalBox()
box.minimum = gemmi.Fractional(0.5/5, 1.5/6, 3.5/7)
box.maximum = gemmi.Fractional(4.5/5, 2.5/6, 5.5/7)
m.set_extent(box)
cut_data = data[1:5, 2:3, 4:6]
self.assertEqual(cut_data.shape, (4, 1, 2))
self.assertTrue(numpy.array_equal(m.grid.array, cut_data))
# CCP4 MAPMASK generated tests/iota_yzx.ccp4.gz from map m:
# mapmask mapin iota_full.ccp4 mapout iota_yzx.ccp4 << eof
# XYZLIM 0.3 0.9 3.4 3.45 -0.5 -0.3
# AXIS Y Z X
# MODE mapin
# eof
yzx_path = full_path('iota_yzx.ccp4.gz')
expanded_data = numpy.full(data.shape, float('nan'), dtype=data.dtype)
expanded_data[1:5, 2:3, 4:6] = cut_data
mcut = gemmi.read_ccp4_map(yzx_path, setup=False)
self.assertEqual(mcut.axis_positions(), [2, 0, 1])
mcut.setup(float('nan'), gemmi.MapSetup.ReorderOnly)
self.assertEqual(mcut.axis_positions(), [0, 1, 2])
self.assertFalse(mcut.full_cell())
self.assertEqual(mcut.grid.axis_order, gemmi.AxisOrder.Unknown)
self.assertTrue(numpy.array_equal(mcut.grid.array, cut_data))
mcut = gemmi.read_ccp4_map(full_path(yzx_path), setup=False)
self.assertFalse(mcut.full_cell())
self.assertEqual(mcut.grid.axis_order, gemmi.AxisOrder.Unknown)
mcut.setup(float('nan'), gemmi.MapSetup.NoSymmetry)
self.assertTrue(mcut.full_cell())
self.assertEqual(mcut.grid.axis_order, gemmi.AxisOrder.XYZ)
assert_numpy_equal(self, mcut.grid.array, expanded_data)
mcut = gemmi.read_ccp4_map(full_path(yzx_path), setup=True)
self.assertTrue(mcut.full_cell())
self.assertEqual(mcut.grid.axis_order, gemmi.AxisOrder.XYZ)
assert_numpy_equal(self, mcut.grid.array, expanded_data)
def test_normalize(self):
yzx_path = full_path('iota_yzx.ccp4.gz')
m = gemmi.read_ccp4_map(full_path(yzx_path), setup=True)
m.grid.normalize()
m.update_ccp4_header()
mean = m.header_float(22)
rms = m.header_float(55)
self.assertAlmostEqual(mean, 0)
self.assertAlmostEqual(rms, 1)
@unittest.skipIf(numpy is None, "NumPy not installed.")
def test_get_subarray(self):
data = numpy.arange(5*6*7, dtype=numpy.float32).reshape((5,6,7))
grid = gemmi.FloatGrid(data)
sub = grid.get_subarray([4,-3,20], [5,10,4])
self.assertEqual(sub[0][0][0], 195.)
self.assertEqual(sub[1][2][3], 37.)
self.assertEqual(sub[-1][-1][-1], 128.)
grid.set_subarray(-sub, [4,-3,20])
sub2 = grid.get_subarray([4,-3,20], [5,10,4])
assert_numpy_equal(self, -sub, sub2)
@unittest.skipIf(numpy is None, "NumPy not installed.")
def test_setup_nosymmetry(self):
m = gemmi.read_ccp4_map(full_path('5i55_tiny.ccp4'))
orig_point_count = m.grid.point_count
m.setup(0, gemmi.MapSetup.Full)
full_nonzero = numpy.count_nonzero(m.grid.array)
self.assertTrue(full_nonzero > orig_point_count)
m = gemmi.read_ccp4_map(full_path('5i55_tiny.ccp4'))
m.setup(0, gemmi.MapSetup.NoSymmetry)
nosym_nonzero = numpy.count_nonzero(m.grid.array)
self.assertEqual(full_nonzero, nosym_nonzero * 2)
nonzero_ext = m.grid.get_nonzero_extent()
span = nonzero_ext.maximum - nonzero_ext.minimum
volume = span[0] * span[1] * span[2]
self.assertAlmostEqual(orig_point_count / m.grid.point_count, volume)
if __name__ == '__main__':
unittest.main()
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