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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
from unittest import TestCase
from pyface.util.color_helpers import (
channels_to_ints, ints_to_channels, is_dark, relative_luminance
)
class TestChannelConversion(TestCase):
def test_ints_to_channels(self):
values = (102, 102, 0, 255)
channels = ints_to_channels(values)
self.assertEqual(channels, (0.4, 0.4, 0.0, 1.0))
def test_ints_to_channels_maximum(self):
values = (6, 6, 0, 15)
channels = ints_to_channels(values, maximum=15)
self.assertEqual(channels, (0.4, 0.4, 0.0, 1.0))
def test_channels_to_ints(self):
channels = (0.4, 0.4, 0.0, 1.0)
values = channels_to_ints(channels)
self.assertEqual(values, (102, 102, 0, 255))
def test_channels_to_ints_maximum(self):
channels = (0.4, 0.4, 0.0, 1.0)
values = channels_to_ints(channels, maximum=15)
self.assertEqual(values, (6, 6, 0, 15))
def test_round_trip(self):
""" Test to assert stability of values through round-trips """
for value in range(256):
with self.subTest(int=value):
result = channels_to_ints(ints_to_channels([value]))
self.assertEqual(result, (value,))
def test_round_trip_maximum(self):
""" Test to assert stability of values through round-trips """
for value in range(65536):
with self.subTest(int=value):
result = channels_to_ints(
ints_to_channels(
[value],
maximum=65535,
),
maximum=65535,
)
self.assertEqual(result, (value,))
class TestRelativeLuminance(TestCase):
def test_white(self):
rgb = (1.0, 1.0, 1.0)
result = relative_luminance(rgb)
self.assertEqual(result, 1.0)
def test_black(self):
rgb = (0.0, 0.0, 0.0)
result = relative_luminance(rgb)
self.assertEqual(result, 0.0)
def test_red(self):
rgb = (1.0, 0.0, 0.0)
result = relative_luminance(rgb)
self.assertAlmostEqual(result, 0.2126)
def test_green(self):
rgb = (0.0, 1.0, 0.0)
result = relative_luminance(rgb)
self.assertAlmostEqual(result, 0.7152)
def test_blue(self):
rgb = (0.0, 0.0, 1.0)
result = relative_luminance(rgb)
self.assertAlmostEqual(result, 0.0722)
def test_yellow(self):
rgb = (1.0, 1.0, 0.0)
result = relative_luminance(rgb)
self.assertAlmostEqual(result, 0.2126 + 0.7152)
def test_cyan(self):
rgb = (0.0, 1.0, 1.0)
result = relative_luminance(rgb)
self.assertAlmostEqual(result, 0.7152 + 0.0722)
def test_magenta(self):
rgb = (1.0, 0.0, 1.0)
result = relative_luminance(rgb)
self.assertAlmostEqual(result, 0.2126 + 0.0722)
def test_dark_grey(self):
rgb = (0.01, 0.01, 0.01)
result = relative_luminance(rgb)
self.assertAlmostEqual(result, 0.01/12.92)
def test_medium_grey(self):
rgb = (0.5, 0.5, 0.5)
result = relative_luminance(rgb)
self.assertAlmostEqual(result, (0.555/1.055)**2.4)
class TestIsDark(TestCase):
def test_white(self):
rgb = (1.0, 1.0, 1.0)
result = is_dark(rgb)
self.assertFalse(result)
def test_black(self):
rgb = (0.0, 0.0, 0.0)
result = is_dark(rgb)
self.assertTrue(result)
def test_red(self):
rgb = (1.0, 0.0, 0.0)
result = is_dark(rgb)
self.assertFalse(result)
def test_green(self):
rgb = (0.0, 1.0, 0.0)
result = is_dark(rgb)
self.assertFalse(result)
def test_blue(self):
rgb = (0.0, 0.0, 1.0)
result = is_dark(rgb)
self.assertTrue(result)
def test_yellow(self):
rgb = (1.0, 1.0, 0.0)
result = is_dark(rgb)
self.assertFalse(result)
def test_cyan(self):
rgb = (0.0, 1.0, 1.0)
result = is_dark(rgb)
self.assertFalse(result)
def test_magenta(self):
rgb = (1.0, 0.0, 1.0)
result = is_dark(rgb)
self.assertFalse(result)
def test_dark_grey(self):
rgb = (0.01, 0.01, 0.01)
result = is_dark(rgb)
self.assertTrue(result)
def test_medium_grey(self):
rgb = (0.5, 0.5, 0.5)
result = is_dark(rgb)
self.assertFalse(result)
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