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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
import numpy as np
from numpy.testing import assert_array_equal, assert_array_almost_equal, assert_allclose
from vispy.color import (Color, ColorArray, get_color_names,
Colormap,
get_color_dict, get_colormap, get_colormaps)
from vispy.visuals.shaders import Function
from vispy.util import use_log_level
from vispy.testing import (run_tests_if_main, assert_equal, assert_raises,
assert_true)
def test_color():
"""Basic tests for Color class"""
x = Color('white')
assert_array_equal(x.rgba, [1.] * 4)
assert_array_equal(x.rgb, [1.] * 3)
assert_array_equal(x.RGBA, [255] * 4)
assert_array_equal(x.RGB, [255] * 3)
assert_equal(x.value, 1.)
assert_equal(x.alpha, 1.)
x.rgb = [0, 0, 1]
assert_array_equal(x.hsv, [240, 1, 1])
assert_equal(x.hex, '#0000ff')
x.hex = '#00000000'
assert_array_equal(x.rgba, [0.]*4)
def test_color_array():
"""Basic tests for ColorArray class"""
x = ColorArray(['r', 'g', 'b'])
assert_array_equal(x.rgb, np.eye(3))
# Test ColorArray.__getitem__.
assert isinstance(x[0], ColorArray)
assert isinstance(x[:], ColorArray)
assert_array_equal(x.rgba[:], x[:].rgba)
assert_array_equal(x.rgba[0], x[0].rgba.squeeze())
assert_array_equal(x.rgba[1:3], x[1:3].rgba)
assert_raises(ValueError, x.__getitem__, (0, 1))
# Test ColorArray.__setitem__.
x[0] = 0
assert_array_equal(x.rgba[0, :], np.zeros(4))
assert_array_equal(x.rgba, x[:].rgba)
x[1] = 1
assert_array_equal(x[1].rgba, np.ones((1, 4)))
x[:] = .5
assert_array_equal(x.rgba, .5 * np.ones((3, 4)))
assert_raises(ValueError, x.__setitem__, (0, 1), 0)
# test hsv color space colors
x = ColorArray(color_space="hsv", color=[(0, 0, 1),
(0, 0, 0.5), (0, 0, 0)])
assert_array_equal(x.rgba[0], [1, 1, 1, 1])
assert_array_equal(x.rgba[1], [0.5, 0.5, 0.5, 1])
assert_array_equal(x.rgba[2], [0, 0, 0, 1])
x = ColorArray(color_space="hsv")
assert_array_equal(x.rgba[0], [0, 0, 0, 1])
x = ColorArray([Color((0, 0, 0)), Color((1, 1, 1))])
assert len(x.rgb) == 2
x = ColorArray([ColorArray((0, 0, 0)), ColorArray((1, 1, 1))])
assert len(x.rgb) == 2
def test_color_interpretation():
"""Test basic color interpretation API"""
# test useful ways of single color init
r = ColorArray('r')
print(r) # test repr
r2 = ColorArray(r)
assert_equal(r, r2)
r2.rgb = 0, 0, 0
assert_equal(r2, ColorArray('black'))
assert_equal(r, ColorArray('r')) # modifying new one preserves old
assert_equal(r, r.copy())
assert_equal(r, ColorArray('#ff0000'))
assert_equal(r, ColorArray('#FF0000FF'))
assert_equal(r, ColorArray('red'))
assert_equal(r, ColorArray('red', alpha=1.0))
assert_equal(ColorArray((1, 0, 0, 0.1)), ColorArray('red', alpha=0.1))
assert_array_equal(r.rgb.ravel(), (1., 0., 0.))
assert_array_equal(r.rgba.ravel(), (1., 0., 0., 1.))
assert_array_equal(r.RGBA.ravel(), (255, 0, 0, 255))
# handling multiple colors
rgb = ColorArray(list('rgb'))
print(rgb) # multi repr
assert_array_equal(rgb, ColorArray(np.eye(3)))
# complex/annoying case
rgb = ColorArray(['r', (0, 1, 0), '#0000ffff'])
assert_array_equal(rgb, ColorArray(np.eye(3)))
assert_raises(RuntimeError, ColorArray, ['r', np.eye(3)]) # can't nest
# getting/setting properties
r = ColorArray('#ffff')
assert_equal(r, ColorArray('white'))
r = ColorArray('#ff000000')
assert_true('turquoise' in get_color_names()) # make sure our JSON loaded
assert_equal(r.alpha, 0)
r.alpha = 1.0
assert_equal(r, ColorArray('r'))
r.alpha = 0
r.rgb = (1, 0, 0)
assert_equal(r.alpha, 0)
assert_equal(r.hex, ['#ff0000'])
r.alpha = 1
r.hex = '00ff00'
assert_equal(r, ColorArray('g'))
assert_array_equal(r.rgb.ravel(), (0., 1., 0.))
r.RGB = 255, 0, 0
assert_equal(r, ColorArray('r'))
assert_array_equal(r.RGB.ravel(), (255, 0, 0))
r.RGBA = 255, 0, 0, 0
assert_equal(r, ColorArray('r', alpha=0))
w = ColorArray()
w.rgb = ColorArray('r').rgb + ColorArray('g').rgb + ColorArray('b').rgb
assert_equal(w, ColorArray('white'))
w = ColorArray('white')
assert_equal(w, w.darker().lighter())
assert_equal(w, w.darker(0.1).darker(-0.1))
w2 = w.darker()
assert_true(w != w2)
w.darker(copy=False)
assert_equal(w, w2)
with use_log_level('warning', record=True, print_msg=False) as w:
w = ColorArray('white')
w.value = 2
assert_equal(len(w), 1)
assert_equal(w, ColorArray('white'))
# warnings and errors
assert_raises(ValueError, ColorArray, '#ffii00') # non-hex
assert_raises(ValueError, ColorArray, '#ff000') # too short
assert_raises(ValueError, ColorArray, [0, 0]) # not enough vals
assert_raises(ValueError, ColorArray, [2, 0, 0]) # val > 1
assert_raises(ValueError, ColorArray, [-1, 0, 0]) # val < 0
c = ColorArray([2., 0., 0.], clip=True) # val > 1
assert_true(np.all(c.rgb <= 1))
c = ColorArray([-1., 0., 0.], clip=True) # val < 0
assert_true(np.all(c.rgb >= 0))
# make sure our color dict works
for key in get_color_names():
assert_true(ColorArray(key))
assert_raises(ValueError, ColorArray, 'foo') # unknown color error
_color_dict = get_color_dict()
assert isinstance(_color_dict, dict)
assert set(_color_dict.keys()) == set(get_color_names())
# Taken from known values
hsv_dict = dict(red=(0, 1, 1),
lime=(120, 1, 1),
yellow=(60, 1, 1),
silver=(0, 0, 0.75),
olive=(60, 1, 0.5),
purple=(300, 1, 0.5),
navy=(240, 1, 0.5))
# Taken from skimage conversions
lab_dict = dict(red=(53.2405879437448, 80.0941668344849, 67.2015369950715),
lime=(87.7350994883189, -86.1812575110439, 83.1774770684517),
yellow=(97.1395070397132, -21.5523924360088, 94.4757817840079),
black=(0., 0., 0.),
white=(100., 0., 0.),
gray=(53.5850240, 0., 0.),
olive=(51.86909754, -12.93002583, 56.67467593))
def test_color_conversion():
"""Test color conversions"""
# HSV
# test known values
test = ColorArray()
for key in hsv_dict:
c = ColorArray(key)
test.hsv = hsv_dict[key]
assert_allclose(c.RGB, test.RGB, atol=1)
test.value = 0
assert_equal(test.value, 0)
assert_equal(test, ColorArray('black'))
c = ColorArray('black')
assert_array_equal(c.hsv.ravel(), (0, 0, 0))
rng = np.random.RandomState(0)
for _ in range(50):
hsv = rng.rand(3)
hsv[0] *= 360
hsv[1] = hsv[1] * 0.99 + 0.01 # avoid ugly boundary effects
hsv[2] = hsv[2] * 0.99 + 0.01
c.hsv = hsv
assert_allclose(c.hsv.ravel(), hsv, rtol=1e-4, atol=1e-4)
# Lab
test = ColorArray()
for key in lab_dict:
c = ColorArray(key)
test.lab = lab_dict[key]
assert_allclose(c.rgba, test.rgba, atol=1e-4, rtol=1e-4)
assert_allclose(test.lab.ravel(), lab_dict[key], atol=1e-4, rtol=1e-4)
for _ in range(50):
# boundaries can have ugly rounding errors in some parameters
rgb = (rng.rand(3)[np.newaxis, :] * 0.9 + 0.05)
c.rgb = rgb
lab = c.lab
c.lab = lab
assert_allclose(c.lab, lab, atol=1e-4, rtol=1e-4)
assert_allclose(c.rgb, rgb, atol=1e-4, rtol=1e-4)
def test_colormap_interpolation():
"""Test interpolation routines for colormaps."""
import vispy.color.colormap as c
assert_raises(AssertionError, c._glsl_step, [0., 1.],)
for fun in (c._glsl_step, c._glsl_mix):
assert_raises(AssertionError, fun, controls=[0.1, 1.],)
assert_raises(AssertionError, fun, controls=[0., .9],)
assert_raises(AssertionError, fun, controls=[0.1, .9],)
# Interpolation tests.
color_0 = np.array([1., 0., 0.])
color_1 = np.array([0., 1., 0.])
color_2 = np.array([0., 0., 1.])
colors_00 = np.vstack((color_0, color_0))
colors_01 = np.vstack((color_0, color_1))
colors_11 = np.vstack((color_1, color_1))
# colors_012 = np.vstack((color_0, color_1, color_2))
colors_021 = np.vstack((color_0, color_2, color_1))
controls_2 = np.array([0., 1.])
controls_3 = np.array([0., .25, 1.])
x = np.array([-1., 0., 0.1, 0.4, 0.5, 0.6, 1., 2.])[:, None]
mixed_2 = c.mix(colors_01, x, controls_2)
mixed_3 = c.mix(colors_021, x, controls_3)
for y in mixed_2, mixed_3:
assert_allclose(y[:2, :], colors_00)
assert_allclose(y[-2:, :], colors_11)
assert_allclose(mixed_2[:, -1], np.zeros(len(y)))
def test_colormap_gradient():
"""Test gradient colormaps."""
cm = Colormap(['r', 'g'])
assert_allclose(cm[-1].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.5].rgba, [[.5, .5, 0, 1]])
assert_allclose(cm[1.].rgba, [[0, 1, 0, 1]])
cm = Colormap(['r', 'g', 'b'])
assert_allclose(cm[-1].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[.5].rgba, [[0, 1, 0, 1]])
assert_allclose(cm[1].rgba, [[0, 0, 1, 1]])
assert_allclose(cm[2].rgba, [[0, 0, 1, 1]])
cm = Colormap(['r', 'g', 'b'], [0., 0.1, 1.0])
assert_allclose(cm[-1].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[.1].rgba, [[0, 1, 0, 1]])
assert_allclose(cm[1].rgba, [[0, 0, 1, 1]], 1e-6, 1e-6)
assert_allclose(cm[2].rgba, [[0, 0, 1, 1]], 1e-6, 1e-6)
def test_colormap_discrete():
"""Test discrete colormaps."""
cm = Colormap(['r', 'g'], interpolation='zero')
assert_allclose(cm[-1].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.49].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.51].rgba, [[0, 1, 0, 1]])
assert_allclose(cm[1.].rgba, [[0, 1, 0, 1]])
cm = Colormap(['r', 'g', 'b'], interpolation='zero')
assert_allclose(cm[-1].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[.32].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[.34].rgba, [[0, 1, 0, 1]])
assert_allclose(cm[.66].rgba, [[0, 1, 0, 1]])
assert_allclose(cm[.67].rgba, [[0, 0, 1, 1]])
assert_allclose(cm[.99].rgba, [[0, 0, 1, 1]])
assert_allclose(cm[1].rgba, [[0, 0, 1, 1]])
assert_allclose(cm[1.1].rgba, [[0, 0, 1, 1]])
cm = Colormap(['r', 'g', 'b'], [0., 0.1, 0.8, 1.0],
interpolation='zero')
assert_allclose(cm[-1].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[0.].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[.099].rgba, [[1, 0, 0, 1]])
assert_allclose(cm[.101].rgba, [[0, 1, 0, 1]])
assert_allclose(cm[.799].rgba, [[0, 1, 0, 1]])
assert_allclose(cm[.801].rgba, [[0, 0, 1, 1]])
assert_allclose(cm[1].rgba, [[0, 0, 1, 1]], 1e-6, 1e-6)
assert_allclose(cm[2].rgba, [[0, 0, 1, 1]], 1e-6, 1e-6)
def test_colormap():
"""Test named colormaps."""
autumn = get_colormap('autumn')
assert autumn.glsl_map != ""
assert len(autumn[0.]) == 1
assert len(autumn[0.5]) == 1
assert len(autumn[1.]) == 1
assert len(autumn[[0., 0.5, 1.]]) == 3
assert len(autumn[np.array([0., 0.5, 1.])]) == 3
fire = get_colormap('fire')
assert_array_equal(fire[0].rgba, np.ones((1, 4)))
assert_array_equal(fire[1].rgba, np.array([[1, 0, 0, 1]]))
grays = get_colormap('grays')
assert_array_equal(grays[.5].rgb, np.ones((1, 3)) * .5)
hot = get_colormap('hot')
assert_allclose(hot[0].rgba, [[0, 0, 0, 1]], 1e-6, 1e-6)
assert_allclose(hot[0.5].rgba, [[1, .52272022, 0, 1]], 1e-6, 1e-6)
assert_allclose(hot[1.].rgba, [[1, 1, 1, 1]], 1e-6, 1e-6)
# Test the GLSL and Python mapping.
for name in get_colormaps():
colormap = get_colormap(name)
Function(colormap.glsl_map)
colors = colormap[np.linspace(-2., 2., 50)]
assert colors.rgba.min() >= 0
assert colors.rgba.max() <= 1
def test_normalize():
"""Test the _normalize() function."""
from vispy.color.colormap import _normalize
for x in (-1, 0., .5, 1., 10., 20):
assert _normalize(x) == .5
assert_allclose(_normalize((-1., 0., 1.)), (0., .5, 1.))
assert_allclose(_normalize((-1., 0., 1.), 0., 1.),
(0., 0., 1.))
assert_allclose(_normalize((-1., 0., 1.), 0., 1., clip=False),
(-1., 0., 1.))
y = _normalize(np.random.randn(100, 5), -10., 10.)
assert_allclose([y.min(), y.max()], [0.2975, 1-0.2975], 1e-1, 1e-1)
def test_colormap_bad_color():
"""Test NaN handling."""
red = (1, 0, 0, 1)
white = (1, 1, 1, 1)
green = (0, 1, 0, 1)
cm = Colormap([white, green], bad_color=red)
assert_array_equal(cm[0].rgba, [white])
assert_array_equal(cm[1].rgba, [green])
def test_colormap_high_low_color():
"""Test handling of clim extremes."""
hilo = get_colormap('HiLo')
white = (1, 1, 1, 1)
gray = (0.5, 0.5, 0.5, 1)
black = (0, 0, 0, 1)
red = (1, 0, 0, 1)
blue = (0, 0, 1, 1)
assert_array_equal(hilo[0].rgba, [blue])
assert_array_almost_equal(hilo[0.000001].rgba, [black])
assert_array_equal(hilo[0.5].rgba, [gray])
assert_array_almost_equal(hilo[0.999999].rgba, [white])
assert_array_equal(hilo[1].rgba, [red])
run_tests_if_main()
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