3a863fff9a
* Fix incorrect default value for scale paremter in makeARGB. * update tests to pass with codebase change
361 lines
13 KiB
Python
361 lines
13 KiB
Python
import pyqtgraph as pg
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import numpy as np
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import sys
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from numpy.testing import assert_array_almost_equal, assert_almost_equal
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import pytest
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np.random.seed(12345)
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def testSolve3D():
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p1 = np.array([[0,0,0,1],
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[1,0,0,1],
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[0,1,0,1],
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[0,0,1,1]], dtype=float)
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# transform points through random matrix
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tr = np.random.normal(size=(4, 4))
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tr[3] = (0,0,0,1)
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p2 = np.dot(tr, p1.T).T[:,:3]
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# solve to see if we can recover the transformation matrix.
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tr2 = pg.solve3DTransform(p1, p2)
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assert_array_almost_equal(tr[:3], tr2[:3])
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def test_interpolateArray_order0():
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check_interpolateArray(order=0)
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def test_interpolateArray_order1():
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check_interpolateArray(order=1)
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def check_interpolateArray(order):
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def interpolateArray(data, x):
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result = pg.interpolateArray(data, x, order=order)
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assert result.shape == x.shape[:-1] + data.shape[x.shape[-1]:]
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return result
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data = np.array([[ 1., 2., 4. ],
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[ 10., 20., 40. ],
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[ 100., 200., 400.]])
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# test various x shapes
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interpolateArray(data, np.ones((1,)))
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interpolateArray(data, np.ones((2,)))
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interpolateArray(data, np.ones((1, 1)))
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interpolateArray(data, np.ones((1, 2)))
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interpolateArray(data, np.ones((5, 1)))
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interpolateArray(data, np.ones((5, 2)))
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interpolateArray(data, np.ones((5, 5, 1)))
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interpolateArray(data, np.ones((5, 5, 2)))
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with pytest.raises(TypeError):
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interpolateArray(data, np.ones((3,)))
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with pytest.raises(TypeError):
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interpolateArray(data, np.ones((1, 3,)))
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with pytest.raises(TypeError):
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interpolateArray(data, np.ones((5, 5, 3,)))
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x = np.array([[ 0.3, 0.6],
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[ 1. , 1. ],
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[ 0.501, 1. ], # NOTE: testing at exactly 0.5 can yield different results from map_coordinates
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[ 0.501, 2.501], # due to differences in rounding
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[ 10. , 10. ]])
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result = interpolateArray(data, x)
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# make sure results match ndimage.map_coordinates
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import scipy.ndimage
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spresult = scipy.ndimage.map_coordinates(data, x.T, order=order)
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#spresult = np.array([ 5.92, 20. , 11. , 0. , 0. ]) # generated with the above line
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assert_array_almost_equal(result, spresult)
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# test mapping when x.shape[-1] < data.ndim
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x = np.array([[ 0.3, 0],
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[ 0.3, 1],
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[ 0.3, 2]])
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r1 = interpolateArray(data, x)
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x = np.array([0.3]) # should broadcast across axis 1
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r2 = interpolateArray(data, x)
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assert_array_almost_equal(r1, r2)
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# test mapping 2D array of locations
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x = np.array([[[0.501, 0.501], [0.501, 1.0], [0.501, 1.501]],
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[[1.501, 0.501], [1.501, 1.0], [1.501, 1.501]]])
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r1 = interpolateArray(data, x)
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r2 = scipy.ndimage.map_coordinates(data, x.transpose(2,0,1), order=order)
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#r2 = np.array([[ 8.25, 11. , 16.5 ], # generated with the above line
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#[ 82.5 , 110. , 165. ]])
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assert_array_almost_equal(r1, r2)
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def test_subArray():
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a = np.array([0, 0, 111, 112, 113, 0, 121, 122, 123, 0, 0, 0, 211, 212, 213, 0, 221, 222, 223, 0, 0, 0, 0])
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b = pg.subArray(a, offset=2, shape=(2,2,3), stride=(10,4,1))
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c = np.array([[[111,112,113], [121,122,123]], [[211,212,213], [221,222,223]]])
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assert np.all(b == c)
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# operate over first axis; broadcast over the rest
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aa = np.vstack([a, a/100.]).T
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cc = np.empty(c.shape + (2,))
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cc[..., 0] = c
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cc[..., 1] = c / 100.
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bb = pg.subArray(aa, offset=2, shape=(2,2,3), stride=(10,4,1))
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assert np.all(bb == cc)
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def test_rescaleData():
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dtypes = map(np.dtype, ('ubyte', 'uint16', 'byte', 'int16', 'int', 'float'))
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for dtype1 in dtypes:
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for dtype2 in dtypes:
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data = (np.random.random(size=10) * 2**32 - 2**31).astype(dtype1)
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for scale, offset in [(10, 0), (10., 0.), (1, -50), (0.2, 0.5), (0.001, 0)]:
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if dtype2.kind in 'iu':
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lim = np.iinfo(dtype2)
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lim = lim.min, lim.max
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else:
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lim = (-np.inf, np.inf)
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s1 = np.clip(float(scale) * (data-float(offset)), *lim).astype(dtype2)
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s2 = pg.rescaleData(data, scale, offset, dtype2)
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assert s1.dtype == s2.dtype
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if dtype2.kind in 'iu':
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assert np.all(s1 == s2)
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else:
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assert np.allclose(s1, s2)
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def test_makeARGB():
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# Many parameters to test here:
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# * data dtype (ubyte, uint16, float, others)
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# * data ndim (2 or 3)
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# * levels (None, 1D, or 2D)
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# * lut dtype
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# * lut size
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# * lut ndim (1 or 2)
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# * useRGBA argument
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# Need to check that all input values map to the correct output values, especially
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# at and beyond the edges of the level range.
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def checkArrays(a, b):
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# because py.test output is difficult to read for arrays
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if not np.all(a == b):
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comp = []
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for i in range(a.shape[0]):
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if a.shape[1] > 1:
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comp.append('[')
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for j in range(a.shape[1]):
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m = a[i,j] == b[i,j]
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comp.append('%d,%d %s %s %s%s' %
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(i, j, str(a[i,j]).ljust(15), str(b[i,j]).ljust(15),
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m, ' ********' if not np.all(m) else ''))
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if a.shape[1] > 1:
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comp.append(']')
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raise Exception("arrays do not match:\n%s" % '\n'.join(comp))
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def checkImage(img, check, alpha, alphaCheck):
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assert img.dtype == np.ubyte
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assert alpha is alphaCheck
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if alpha is False:
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checkArrays(img[..., 3], 255)
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if np.isscalar(check) or check.ndim == 3:
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checkArrays(img[..., :3], check)
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elif check.ndim == 2:
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checkArrays(img[..., :3], check[..., np.newaxis])
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elif check.ndim == 1:
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checkArrays(img[..., :3], check[..., np.newaxis, np.newaxis])
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else:
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raise Exception('invalid check array ndim')
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# uint8 data tests
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im1 = np.arange(256).astype('ubyte').reshape(256, 1)
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im2, alpha = pg.makeARGB(im1, levels=(0, 255))
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checkImage(im2, im1, alpha, False)
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im3, alpha = pg.makeARGB(im1, levels=(0.0, 255.0))
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checkImage(im3, im1, alpha, False)
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im4, alpha = pg.makeARGB(im1, levels=(255, 0))
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checkImage(im4, 255-im1, alpha, False)
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im5, alpha = pg.makeARGB(np.concatenate([im1]*3, axis=1), levels=[(0, 255), (0.0, 255.0), (255, 0)])
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checkImage(im5, np.concatenate([im1, im1, 255-im1], axis=1), alpha, False)
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im2, alpha = pg.makeARGB(im1, levels=(128,383))
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checkImage(im2[:128], 0, alpha, False)
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checkImage(im2[128:], im1[:128], alpha, False)
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# uint8 data + uint8 LUT
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lut = np.arange(256)[::-1].astype(np.uint8)
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im2, alpha = pg.makeARGB(im1, lut=lut)
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checkImage(im2, lut, alpha, False)
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# lut larger than maxint
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lut = np.arange(511).astype(np.uint8)
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im2, alpha = pg.makeARGB(im1, lut=lut)
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checkImage(im2, lut[::2], alpha, False)
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# lut smaller than maxint
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lut = np.arange(128).astype(np.uint8)
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im2, alpha = pg.makeARGB(im1, lut=lut)
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checkImage(im2, np.linspace(0, 127.5, 256, dtype='ubyte'), alpha, False)
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# lut + levels
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lut = np.arange(256)[::-1].astype(np.uint8)
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im2, alpha = pg.makeARGB(im1, lut=lut, levels=[-128, 384])
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checkImage(im2, np.linspace(191.5, 64.5, 256, dtype='ubyte'), alpha, False)
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im2, alpha = pg.makeARGB(im1, lut=lut, levels=[64, 192])
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checkImage(im2, np.clip(np.linspace(384.5, -127.5, 256), 0, 255).astype('ubyte'), alpha, False)
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# uint8 data + uint16 LUT
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lut = np.arange(4096)[::-1].astype(np.uint16) // 16
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im2, alpha = pg.makeARGB(im1, lut=lut)
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checkImage(im2, np.arange(256)[::-1].astype('ubyte'), alpha, False)
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# uint8 data + float LUT
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lut = np.linspace(10., 137., 256)
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im2, alpha = pg.makeARGB(im1, lut=lut)
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checkImage(im2, lut.astype('ubyte'), alpha, False)
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# uint8 data + 2D LUT
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lut = np.zeros((256, 3), dtype='ubyte')
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lut[:,0] = np.arange(256)
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lut[:,1] = np.arange(256)[::-1]
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lut[:,2] = 7
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im2, alpha = pg.makeARGB(im1, lut=lut)
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checkImage(im2, lut[:,None,::-1], alpha, False)
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# check useRGBA
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im2, alpha = pg.makeARGB(im1, lut=lut, useRGBA=True)
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checkImage(im2, lut[:,None,:], alpha, False)
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# uint16 data tests
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im1 = np.arange(0, 2**16, 256).astype('uint16')[:, None]
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im2, alpha = pg.makeARGB(im1, levels=(512, 2**16))
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checkImage(im2, np.clip(np.linspace(-2, 253, 256), 0, 255).astype('ubyte'), alpha, False)
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lut = (np.arange(512, 2**16)[::-1] // 256).astype('ubyte')
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im2, alpha = pg.makeARGB(im1, lut=lut, levels=(512, 2**16-256))
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checkImage(im2, np.clip(np.linspace(257, 2, 256), 0, 255).astype('ubyte'), alpha, False)
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lut = np.zeros(2**16, dtype='ubyte')
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lut[1000:1256] = np.arange(256)
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lut[1256:] = 255
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im1 = np.arange(1000, 1256).astype('uint16')[:, None]
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im2, alpha = pg.makeARGB(im1, lut=lut)
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checkImage(im2, np.arange(256).astype('ubyte'), alpha, False)
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# float data tests
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im1 = np.linspace(1.0, 17.0, 256)[:, None]
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im2, alpha = pg.makeARGB(im1, levels=(5.0, 13.0))
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checkImage(im2, np.clip(np.linspace(-128, 383, 256), 0, 255).astype('ubyte'), alpha, False)
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lut = (np.arange(1280)[::-1] // 10).astype('ubyte')
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im2, alpha = pg.makeARGB(im1, lut=lut, levels=(1, 17))
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checkImage(im2, np.linspace(127.5, 0, 256).astype('ubyte'), alpha, False)
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# test sanity checks
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class AssertExc(object):
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def __init__(self, exc=Exception):
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self.exc = exc
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def __enter__(self):
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return self
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def __exit__(self, *args):
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assert args[0] is self.exc, "Should have raised %s (got %s)" % (self.exc, args[0])
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return True
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with AssertExc(TypeError): # invalid image shape
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pg.makeARGB(np.zeros((2,), dtype='float'))
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with AssertExc(TypeError): # invalid image shape
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pg.makeARGB(np.zeros((2,2,7), dtype='float'))
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with AssertExc(): # float images require levels arg
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pg.makeARGB(np.zeros((2,2), dtype='float'))
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with AssertExc(): # bad levels arg
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pg.makeARGB(np.zeros((2,2), dtype='float'), levels=[1])
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with AssertExc(): # bad levels arg
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pg.makeARGB(np.zeros((2,2), dtype='float'), levels=[1,2,3])
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with AssertExc(): # can't mix 3-channel levels and LUT
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pg.makeARGB(np.zeros((2,2)), lut=np.zeros((10,3), dtype='ubyte'), levels=[(0,1)]*3)
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with AssertExc(): # multichannel levels must have same number of channels as image
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pg.makeARGB(np.zeros((2,2,3), dtype='float'), levels=[(1,2)]*4)
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with AssertExc(): # 3d levels not allowed
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pg.makeARGB(np.zeros((2,2,3), dtype='float'), levels=np.zeros([3, 2, 2]))
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def test_eq():
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eq = pg.functions.eq
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zeros = [0, 0.0, np.float(0), np.int(0)]
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if sys.version[0] < '3':
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zeros.append(long(0))
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for i,x in enumerate(zeros):
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for y in zeros[i:]:
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assert eq(x, y)
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assert eq(y, x)
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assert eq(np.nan, np.nan)
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# test
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class NotEq(object):
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def __eq__(self, x):
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return False
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noteq = NotEq()
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assert eq(noteq, noteq) # passes because they are the same object
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assert not eq(noteq, NotEq())
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# Should be able to test for equivalence even if the test raises certain
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# exceptions
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class NoEq(object):
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def __init__(self, err):
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self.err = err
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def __eq__(self, x):
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raise self.err
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noeq1 = NoEq(AttributeError())
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noeq2 = NoEq(ValueError())
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noeq3 = NoEq(Exception())
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assert eq(noeq1, noeq1)
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assert not eq(noeq1, noeq2)
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assert not eq(noeq2, noeq1)
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with pytest.raises(Exception):
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eq(noeq3, noeq2)
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# test array equivalence
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# note that numpy has a weird behavior here--np.all() always returns True
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# if one of the arrays has size=0; eq() will only return True if both arrays
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# have the same shape.
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a1 = np.zeros((10, 20)).astype('float')
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a2 = a1 + 1
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a3 = a2.astype('int')
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a4 = np.empty((0, 20))
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assert not eq(a1, a2) # same shape/dtype, different values
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assert not eq(a1, a3) # same shape, different dtype and values
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assert not eq(a1, a4) # different shape (note: np.all gives True if one array has size 0)
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assert not eq(a2, a3) # same values, but different dtype
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assert not eq(a2, a4) # different shape
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assert not eq(a3, a4) # different shape and dtype
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assert eq(a4, a4.copy())
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assert not eq(a4, a4.T)
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if __name__ == '__main__':
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test_interpolateArray() |