/usr/lib/python3/dist-packages/matplotlib/tests/test_colors.py is in python3-matplotlib 1.5.1-1ubuntu1.
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unicode_literals)
from matplotlib.externals import six
import itertools
from distutils.version import LooseVersion as V
from nose.tools import assert_raises, assert_equal, assert_true
import numpy as np
from numpy.testing.utils import assert_array_equal, assert_array_almost_equal
import matplotlib.colors as mcolors
import matplotlib.cm as cm
import matplotlib.cbook as cbook
import matplotlib.pyplot as plt
from matplotlib.testing.decorators import (image_comparison,
cleanup, knownfailureif)
def test_colormap_endian():
"""
Github issue #1005: a bug in putmask caused erroneous
mapping of 1.0 when input from a non-native-byteorder
array.
"""
cmap = cm.get_cmap("jet")
# Test under, over, and invalid along with values 0 and 1.
a = [-0.5, 0, 0.5, 1, 1.5, np.nan]
for dt in ["f2", "f4", "f8"]:
anative = np.ma.masked_invalid(np.array(a, dtype=dt))
aforeign = anative.byteswap().newbyteorder()
#print(anative.dtype.isnative, aforeign.dtype.isnative)
assert_array_equal(cmap(anative), cmap(aforeign))
def test_BoundaryNorm():
"""
Github issue #1258: interpolation was failing with numpy
1.7 pre-release.
"""
boundaries = [0, 1.1, 2.2]
vals = [-1, 0, 1, 2, 2.2, 4]
# Without interpolation
expected = [-1, 0, 0, 1, 2, 2]
ncolors = len(boundaries) - 1
bn = mcolors.BoundaryNorm(boundaries, ncolors)
assert_array_equal(bn(vals), expected)
# ncolors != len(boundaries) - 1 triggers interpolation
expected = [-1, 0, 0, 2, 3, 3]
ncolors = len(boundaries)
bn = mcolors.BoundaryNorm(boundaries, ncolors)
assert_array_equal(bn(vals), expected)
# more boundaries for a third color
boundaries = [0, 1, 2, 3]
vals = [-1, 0.1, 1.1, 2.2, 4]
ncolors = 5
expected = [-1, 0, 2, 4, 5]
bn = mcolors.BoundaryNorm(boundaries, ncolors)
assert_array_equal(bn(vals), expected)
# a scalar as input should not trigger an error and should return a scalar
boundaries = [0, 1, 2]
vals = [-1, 0.1, 1.1, 2.2]
bn = mcolors.BoundaryNorm(boundaries, 2)
expected = [-1, 0, 1, 2]
for v, ex in zip(vals, expected):
ret = bn(v)
assert_true(isinstance(ret, six.integer_types))
assert_array_equal(ret, ex)
assert_array_equal(bn([v]), ex)
# same with interp
bn = mcolors.BoundaryNorm(boundaries, 3)
expected = [-1, 0, 2, 3]
for v, ex in zip(vals, expected):
ret = bn(v)
assert_true(isinstance(ret, six.integer_types))
assert_array_equal(ret, ex)
assert_array_equal(bn([v]), ex)
# Clipping
bn = mcolors.BoundaryNorm(boundaries, 3, clip=True)
expected = [0, 0, 2, 2]
for v, ex in zip(vals, expected):
ret = bn(v)
assert_true(isinstance(ret, six.integer_types))
assert_array_equal(ret, ex)
assert_array_equal(bn([v]), ex)
# Masked arrays
boundaries = [0, 1.1, 2.2]
vals = np.ma.masked_invalid([-1., np.NaN, 0, 1.4, 9])
# Without interpolation
ncolors = len(boundaries) - 1
bn = mcolors.BoundaryNorm(boundaries, ncolors)
expected = np.ma.masked_array([-1, -99, 0, 1, 2], mask=[0, 1, 0, 0, 0])
assert_array_equal(bn(vals), expected)
# With interpolation
bn = mcolors.BoundaryNorm(boundaries, len(boundaries))
expected = np.ma.masked_array([-1, -99, 0, 2, 3], mask=[0, 1, 0, 0, 0])
assert_array_equal(bn(vals), expected)
# Non-trivial masked arrays
vals = np.ma.masked_invalid([np.Inf, np.NaN])
assert_true(np.all(bn(vals).mask))
vals = np.ma.masked_invalid([np.Inf])
assert_true(np.all(bn(vals).mask))
def test_LogNorm():
"""
LogNorm ignored clip, now it has the same
behavior as Normalize, e.g., values > vmax are bigger than 1
without clip, with clip they are 1.
"""
ln = mcolors.LogNorm(clip=True, vmax=5)
assert_array_equal(ln([1, 6]), [0, 1.0])
def test_PowerNorm():
a = np.array([0, 0.5, 1, 1.5], dtype=np.float)
pnorm = mcolors.PowerNorm(1)
norm = mcolors.Normalize()
assert_array_almost_equal(norm(a), pnorm(a))
a = np.array([-0.5, 0, 2, 4, 8], dtype=np.float)
expected = [0, 0, 1/16, 1/4, 1]
pnorm = mcolors.PowerNorm(2, vmin=0, vmax=8)
assert_array_almost_equal(pnorm(a), expected)
assert_equal(pnorm(a[0]), expected[0])
assert_equal(pnorm(a[2]), expected[2])
assert_array_almost_equal(a[1:], pnorm.inverse(pnorm(a))[1:])
# Clip = True
a = np.array([-0.5, 0, 1, 8, 16], dtype=np.float)
expected = [0, 0, 0, 1, 1]
pnorm = mcolors.PowerNorm(2, vmin=2, vmax=8, clip=True)
assert_array_almost_equal(pnorm(a), expected)
assert_equal(pnorm(a[0]), expected[0])
assert_equal(pnorm(a[-1]), expected[-1])
# Clip = True at call time
a = np.array([-0.5, 0, 1, 8, 16], dtype=np.float)
expected = [0, 0, 0, 1, 1]
pnorm = mcolors.PowerNorm(2, vmin=2, vmax=8, clip=False)
assert_array_almost_equal(pnorm(a, clip=True), expected)
assert_equal(pnorm(a[0], clip=True), expected[0])
assert_equal(pnorm(a[-1], clip=True), expected[-1])
def test_Normalize():
norm = mcolors.Normalize()
vals = np.arange(-10, 10, 1, dtype=np.float)
_inverse_tester(norm, vals)
_scalar_tester(norm, vals)
_mask_tester(norm, vals)
def test_SymLogNorm():
"""
Test SymLogNorm behavior
"""
norm = mcolors.SymLogNorm(3, vmax=5, linscale=1.2)
vals = np.array([-30, -1, 2, 6], dtype=np.float)
normed_vals = norm(vals)
expected = [0., 0.53980074, 0.826991, 1.02758204]
assert_array_almost_equal(normed_vals, expected)
_inverse_tester(norm, vals)
_scalar_tester(norm, vals)
_mask_tester(norm, vals)
# Ensure that specifying vmin returns the same result as above
norm = mcolors.SymLogNorm(3, vmin=-30, vmax=5, linscale=1.2)
normed_vals = norm(vals)
assert_array_almost_equal(normed_vals, expected)
def _inverse_tester(norm_instance, vals):
"""
Checks if the inverse of the given normalization is working.
"""
assert_array_almost_equal(norm_instance.inverse(norm_instance(vals)), vals)
def _scalar_tester(norm_instance, vals):
"""
Checks if scalars and arrays are handled the same way.
Tests only for float.
"""
scalar_result = [norm_instance(float(v)) for v in vals]
assert_array_almost_equal(scalar_result, norm_instance(vals))
def _mask_tester(norm_instance, vals):
"""
Checks mask handling
"""
masked_array = np.ma.array(vals)
masked_array[0] = np.ma.masked
assert_array_equal(masked_array.mask, norm_instance(masked_array).mask)
@image_comparison(baseline_images=['levels_and_colors'],
extensions=['png'])
def test_cmap_and_norm_from_levels_and_colors():
data = np.linspace(-2, 4, 49).reshape(7, 7)
levels = [-1, 2, 2.5, 3]
colors = ['red', 'green', 'blue', 'yellow', 'black']
extend = 'both'
cmap, norm = mcolors.from_levels_and_colors(levels, colors, extend=extend)
ax = plt.axes()
m = plt.pcolormesh(data, cmap=cmap, norm=norm)
plt.colorbar(m)
# Hide the axes labels (but not the colorbar ones, as they are useful)
for lab in ax.get_xticklabels() + ax.get_yticklabels():
lab.set_visible(False)
def test_cmap_and_norm_from_levels_and_colors2():
levels = [-1, 2, 2.5, 3]
colors = ['red', (0, 1, 0), 'blue', (0.5, 0.5, 0.5), (0.0, 0.0, 0.0, 1.0)]
clr = mcolors.colorConverter.to_rgba_array(colors)
bad = (0.1, 0.1, 0.1, 0.1)
no_color = (0.0, 0.0, 0.0, 0.0)
masked_value = 'masked_value'
# Define the test values which are of interest.
# Note: levels are lev[i] <= v < lev[i+1]
tests = [('both', None, {-2: clr[0],
-1: clr[1],
2: clr[2],
2.25: clr[2],
3: clr[4],
3.5: clr[4],
masked_value: bad}),
('min', -1, {-2: clr[0],
-1: clr[1],
2: clr[2],
2.25: clr[2],
3: no_color,
3.5: no_color,
masked_value: bad}),
('max', -1, {-2: no_color,
-1: clr[0],
2: clr[1],
2.25: clr[1],
3: clr[3],
3.5: clr[3],
masked_value: bad}),
('neither', -2, {-2: no_color,
-1: clr[0],
2: clr[1],
2.25: clr[1],
3: no_color,
3.5: no_color,
masked_value: bad}),
]
for extend, i1, cases in tests:
cmap, norm = mcolors.from_levels_and_colors(levels, colors[0:i1],
extend=extend)
cmap.set_bad(bad)
for d_val, expected_color in cases.items():
if d_val == masked_value:
d_val = np.ma.array([1], mask=True)
else:
d_val = [d_val]
assert_array_equal(expected_color, cmap(norm(d_val))[0],
'Wih extend={0!r} and data '
'value={1!r}'.format(extend, d_val))
assert_raises(ValueError, mcolors.from_levels_and_colors, levels, colors)
def test_rgb_hsv_round_trip():
for a_shape in [(500, 500, 3), (500, 3), (1, 3), (3,)]:
np.random.seed(0)
tt = np.random.random(a_shape)
assert_array_almost_equal(tt,
mcolors.hsv_to_rgb(mcolors.rgb_to_hsv(tt)))
assert_array_almost_equal(tt,
mcolors.rgb_to_hsv(mcolors.hsv_to_rgb(tt)))
@cleanup
def test_autoscale_masked():
# Test for #2336. Previously fully masked data would trigger a ValueError.
data = np.ma.masked_all((12, 20))
plt.pcolor(data)
plt.draw()
def test_colors_no_float():
# Gray must be a string to distinguish 3-4 grays from RGB or RGBA.
def gray_from_float_rgb():
return mcolors.colorConverter.to_rgb(0.4)
def gray_from_float_rgba():
return mcolors.colorConverter.to_rgba(0.4)
assert_raises(ValueError, gray_from_float_rgb)
assert_raises(ValueError, gray_from_float_rgba)
@image_comparison(baseline_images=['light_source_shading_topo'],
extensions=['png'])
def test_light_source_topo_surface():
"""Shades a DEM using different v.e.'s and blend modes."""
fname = cbook.get_sample_data('jacksboro_fault_dem.npz', asfileobj=False)
dem = np.load(fname)
elev = dem['elevation']
# Get the true cellsize in meters for accurate vertical exaggeration
# Convert from decimal degrees to meters
dx, dy = dem['dx'], dem['dy']
dx = 111320.0 * dx * np.cos(dem['ymin'])
dy = 111320.0 * dy
dem.close()
ls = mcolors.LightSource(315, 45)
cmap = cm.gist_earth
fig, axes = plt.subplots(nrows=3, ncols=3)
for row, mode in zip(axes, ['hsv', 'overlay', 'soft']):
for ax, ve in zip(row, [0.1, 1, 10]):
rgb = ls.shade(elev, cmap, vert_exag=ve, dx=dx, dy=dy,
blend_mode=mode)
ax.imshow(rgb)
ax.set(xticks=[], yticks=[])
def test_light_source_shading_default():
"""Array comparison test for the default "hsv" blend mode. Ensure the
default result doesn't change without warning."""
y, x = np.mgrid[-1.2:1.2:8j, -1.2:1.2:8j]
z = 10 * np.cos(x**2 + y**2)
cmap = plt.cm.copper
ls = mcolors.LightSource(315, 45)
rgb = ls.shade(z, cmap)
# Result stored transposed and rounded for for more compact display...
expect = np.array([[[0.87, 0.85, 0.90, 0.90, 0.82, 0.62, 0.34, 0.00],
[0.85, 0.94, 0.99, 1.00, 1.00, 0.96, 0.62, 0.17],
[0.90, 0.99, 1.00, 1.00, 1.00, 1.00, 0.71, 0.33],
[0.90, 1.00, 1.00, 1.00, 1.00, 0.98, 0.51, 0.29],
[0.82, 1.00, 1.00, 1.00, 1.00, 0.64, 0.25, 0.13],
[0.62, 0.96, 1.00, 0.98, 0.64, 0.22, 0.06, 0.03],
[0.34, 0.62, 0.71, 0.51, 0.25, 0.06, 0.00, 0.01],
[0.00, 0.17, 0.33, 0.29, 0.13, 0.03, 0.01, 0.00]],
[[0.87, 0.79, 0.83, 0.80, 0.66, 0.44, 0.23, 0.00],
[0.79, 0.88, 0.93, 0.92, 0.83, 0.66, 0.38, 0.10],
[0.83, 0.93, 0.99, 1.00, 0.92, 0.75, 0.40, 0.18],
[0.80, 0.92, 1.00, 0.99, 0.93, 0.75, 0.28, 0.14],
[0.66, 0.83, 0.92, 0.93, 0.87, 0.44, 0.12, 0.06],
[0.44, 0.66, 0.75, 0.75, 0.44, 0.12, 0.03, 0.01],
[0.23, 0.38, 0.40, 0.28, 0.12, 0.03, 0.00, 0.00],
[0.00, 0.10, 0.18, 0.14, 0.06, 0.01, 0.00, 0.00]],
[[0.87, 0.75, 0.78, 0.73, 0.55, 0.33, 0.16, 0.00],
[0.75, 0.85, 0.90, 0.86, 0.71, 0.48, 0.23, 0.05],
[0.78, 0.90, 0.98, 1.00, 0.82, 0.51, 0.21, 0.08],
[0.73, 0.86, 1.00, 0.97, 0.84, 0.47, 0.11, 0.05],
[0.55, 0.71, 0.82, 0.84, 0.71, 0.20, 0.03, 0.01],
[0.33, 0.48, 0.51, 0.47, 0.20, 0.02, 0.00, 0.00],
[0.16, 0.23, 0.21, 0.11, 0.03, 0.00, 0.00, 0.00],
[0.00, 0.05, 0.08, 0.05, 0.01, 0.00, 0.00, 0.00]],
[[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00]]]).T
if (V(np.__version__) == V('1.9.0')):
# Numpy 1.9.0 uses a 2. order algorithm on the edges by default
# This was changed back again in 1.9.1
expect = expect[1:-1, 1:-1, :]
rgb = rgb[1:-1, 1:-1, :]
assert_array_almost_equal(rgb, expect, decimal=2)
@knownfailureif((V(np.__version__) <= V('1.9.0')
and V(np.__version__) >= V('1.7.0')))
# Numpy 1.9.1 fixed a bug in masked arrays which resulted in
# additional elements being masked when calculating the gradient thus
# the output is different with earlier numpy versions.
def test_light_source_masked_shading():
"""Array comparison test for a surface with a masked portion. Ensures that
we don't wind up with "fringes" of odd colors around masked regions."""
y, x = np.mgrid[-1.2:1.2:8j, -1.2:1.2:8j]
z = 10 * np.cos(x**2 + y**2)
z = np.ma.masked_greater(z, 9.9)
cmap = plt.cm.copper
ls = mcolors.LightSource(315, 45)
rgb = ls.shade(z, cmap)
# Result stored transposed and rounded for for more compact display...
expect = np.array([[[0.90, 0.88, 0.91, 0.91, 0.84, 0.64, 0.36, 0.00],
[0.88, 0.96, 1.00, 1.00, 1.00, 0.97, 0.64, 0.18],
[0.91, 1.00, 1.00, 1.00, 1.00, 1.00, 0.74, 0.34],
[0.91, 1.00, 1.00, 0.00, 0.00, 1.00, 0.52, 0.30],
[0.84, 1.00, 1.00, 0.00, 0.00, 1.00, 0.25, 0.13],
[0.64, 0.97, 1.00, 1.00, 1.00, 0.23, 0.07, 0.03],
[0.36, 0.64, 0.74, 0.52, 0.25, 0.07, 0.00, 0.01],
[0.00, 0.18, 0.34, 0.30, 0.13, 0.03, 0.01, 0.00]],
[[0.90, 0.82, 0.85, 0.82, 0.68, 0.46, 0.24, 0.00],
[0.82, 0.91, 0.95, 0.93, 0.85, 0.68, 0.39, 0.10],
[0.85, 0.95, 1.00, 0.78, 0.78, 0.77, 0.42, 0.18],
[0.82, 0.93, 0.78, 0.00, 0.00, 0.78, 0.30, 0.15],
[0.68, 0.85, 0.78, 0.00, 0.00, 0.78, 0.13, 0.06],
[0.46, 0.68, 0.77, 0.78, 0.78, 0.13, 0.03, 0.01],
[0.24, 0.39, 0.42, 0.30, 0.13, 0.03, 0.00, 0.00],
[0.00, 0.10, 0.18, 0.15, 0.06, 0.01, 0.00, 0.00]],
[[0.90, 0.79, 0.81, 0.76, 0.58, 0.35, 0.17, 0.00],
[0.79, 0.88, 0.92, 0.88, 0.73, 0.50, 0.24, 0.05],
[0.81, 0.92, 1.00, 0.50, 0.50, 0.53, 0.22, 0.09],
[0.76, 0.88, 0.50, 0.00, 0.00, 0.50, 0.12, 0.05],
[0.58, 0.73, 0.50, 0.00, 0.00, 0.50, 0.03, 0.01],
[0.35, 0.50, 0.53, 0.50, 0.50, 0.02, 0.00, 0.00],
[0.17, 0.24, 0.22, 0.12, 0.03, 0.00, 0.00, 0.00],
[0.00, 0.05, 0.09, 0.05, 0.01, 0.00, 0.00, 0.00]],
[[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 0.00, 0.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 0.00, 0.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00],
[1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00]]]).T
assert_array_almost_equal(rgb, expect, decimal=2)
def test_light_source_hillshading():
"""Compare the current hillshading method against one that should be
mathematically equivalent. Illuminates a cone from a range of angles."""
def alternative_hillshade(azimuth, elev, z):
illum = _sph2cart(*_azimuth2math(azimuth, elev))
illum = np.array(illum)
dy, dx = np.gradient(-z)
dy = -dy
dz = np.ones_like(dy)
normals = np.dstack([dx, dy, dz])
dividers = np.zeros_like(z)[..., None]
for i, mat in enumerate(normals):
for j, vec in enumerate(mat):
dividers[i, j, 0] = np.linalg.norm(vec)
normals /= dividers
# once we drop support for numpy 1.7.x the above can be written as
# normals /= np.linalg.norm(normals, axis=2)[..., None]
# aviding the double loop.
intensity = np.tensordot(normals, illum, axes=(2, 0))
intensity -= intensity.min()
intensity /= intensity.ptp()
return intensity
y, x = np.mgrid[5:0:-1, :5]
z = -np.hypot(x - x.mean(), y - y.mean())
for az, elev in itertools.product(range(0, 390, 30), range(0, 105, 15)):
ls = mcolors.LightSource(az, elev)
h1 = ls.hillshade(z)
h2 = alternative_hillshade(az, elev, z)
assert_array_almost_equal(h1, h2)
def test_light_source_planar_hillshading():
"""Ensure that the illumination intensity is correct for planar
surfaces."""
def plane(azimuth, elevation, x, y):
"""Create a plane whose normal vector is at the given azimuth and
elevation."""
theta, phi = _azimuth2math(azimuth, elevation)
a, b, c = _sph2cart(theta, phi)
z = -(a*x + b*y) / c
return z
def angled_plane(azimuth, elevation, angle, x, y):
"""Create a plane whose normal vector is at an angle from the given
azimuth and elevation."""
elevation = elevation + angle
if elevation > 90:
azimuth = (azimuth + 180) % 360
elevation = (90 - elevation) % 90
return plane(azimuth, elevation, x, y)
y, x = np.mgrid[5:0:-1, :5]
for az, elev in itertools.product(range(0, 390, 30), range(0, 105, 15)):
ls = mcolors.LightSource(az, elev)
# Make a plane at a range of angles to the illumination
for angle in range(0, 105, 15):
z = angled_plane(az, elev, angle, x, y)
h = ls.hillshade(z)
assert_array_almost_equal(h, np.cos(np.radians(angle)))
def _sph2cart(theta, phi):
x = np.cos(theta) * np.sin(phi)
y = np.sin(theta) * np.sin(phi)
z = np.cos(phi)
return x, y, z
def _azimuth2math(azimuth, elevation):
"""Converts from clockwise-from-north and up-from-horizontal to
mathematical conventions."""
theta = np.radians((90 - azimuth) % 360)
phi = np.radians(90 - elevation)
return theta, phi
if __name__ == '__main__':
import nose
nose.runmodule(argv=['-s', '--with-doctest'], exit=False)
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