def test_has_higher_luminance(self):
yellow = Color((255, 255, 0))
orange = Color((255, 165, 0))
self.assertTrue(yellow.has_higher_luminance(orange))
self.assertFalse(orange.has_higher_luminance(yellow))
self.assertFalse(orange.has_higher_luminance(orange))
def test_find_lightness_threshold(self):
yellow = Color((255, 255, 0))
orange = Color((255, 165, 0))
level = 'A'
target_ratio = 3.0
new_color = yellow.find_lightness_threshold(orange, level)
new_contrast_ratio = yellow.contrast_ratio_against(new_color)
self.assertTrue(orange.has_higher_luminance(new_color))
self.assertGreater(new_contrast_ratio, target_ratio)
self.assertAlmostEqual(new_contrast_ratio, target_ratio, 1)
new_color = orange.find_lightness_threshold(orange, level)
new_contrast_ratio = orange.contrast_ratio_against(new_color)
self.assertTrue(orange.has_higher_luminance(new_color))
self.assertGreater(new_contrast_ratio, target_ratio)
self.assertAlmostEqual(new_contrast_ratio, target_ratio, 1)
level = 'AA'
target_ratio = 4.5
new_color = yellow.find_lightness_threshold(orange, level)
new_contrast_ratio = yellow.contrast_ratio_against(new_color)
self.assertTrue(orange.has_higher_luminance(new_color))
self.assertGreater(new_contrast_ratio, target_ratio)
self.assertAlmostEqual(new_contrast_ratio, target_ratio, 1)
new_color = orange.find_lightness_threshold(orange, level)
new_contrast_ratio = orange.contrast_ratio_against(new_color)
self.assertTrue(orange.has_higher_luminance(new_color))
self.assertGreater(new_contrast_ratio, target_ratio)
self.assertAlmostEqual(new_contrast_ratio, target_ratio, 1)
def test_find(self):
black = Color.from_name('black')
white = Color.from_name('white')
orange = Color.from_name('orange')
mintcream = Color.from_name('mintcream')
yellow = Color.from_name('yellow')
springgreen = Color.from_name('springgreen')
green = Color.from_name('green')
darkgreen = Color.from_name('darkgreen')
blue = Color.from_name('blue')
azure = Color.from_name('azure')
blueviolet = Color.from_name('blueviolet')
fuchsia = Color.from_name('fuchsia')
new_rgb = lightness.find(fuchsia.rgb, azure.rgb, 'A')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(fuchsia)
self.assertTrue(azure.has_higher_luminance(fuchsia))
self.assertTrue(azure.has_higher_luminance(new_color))
self.assertEqual(new_color.hex, '#e9ffff')
self.assertGreater(new_contrast_ratio, 3.0)
self.assertAlmostEqual(new_contrast_ratio, 3, 1)
contrast_against_white = darkgreen.contrast_ratio_against(white)
contrast_against_black = darkgreen.contrast_ratio_against(black)
new_rgb = lightness.find(darkgreen.rgb, darkgreen.rgb, 'A')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(darkgreen)
self.assertFalse(darkgreen.is_light_color())
self.assertGreater(contrast_against_white, contrast_against_black)
self.assertEqual(new_color.hex, '#00c000')
self.assertTrue(new_color.has_higher_luminance(darkgreen))
self.assertGreater(new_contrast_ratio, 3.0)
self.assertAlmostEqual(new_contrast_ratio, 3, 1)
new_rgb = lightness.find(white.rgb, orange.rgb, 'AA')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(white)
self.assertEqual(new_color.hex, '#a56a00')
self.assertGreater(new_contrast_ratio, 4.5)
self.assertAlmostEqual(new_contrast_ratio, 4.5, 1)
new_rgb = lightness.find(white.rgb, green.rgb, 'AA')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(white)
self.assertEqual(new_color.hex, '#008a00')
self.assertGreater(new_contrast_ratio, 4.5)
self.assertAlmostEqual(new_contrast_ratio, 4.5, 1)
new_rgb = lightness.find(blueviolet.rgb, orange.rgb, 'AA')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(blueviolet)
self.assertEqual(new_color.hex, '#ffdc9a')
self.assertGreater(new_contrast_ratio, 4.5)
self.assertAlmostEqual(new_contrast_ratio, 4.5, 1)
contrast_against_white = springgreen.contrast_ratio_against(white)
contrast_against_black = springgreen.contrast_ratio_against(black)
new_rgb = lightness.find(springgreen.rgb, springgreen.rgb, 'AA')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(springgreen)
self.assertTrue(springgreen.is_light_color())
self.assertLess(contrast_against_white, contrast_against_black)
self.assertEqual(new_color.hex, '#007239')
self.assertFalse(new_color.has_higher_luminance(springgreen))
self.assertGreater(new_contrast_ratio, 4.5)
self.assertAlmostEqual(new_contrast_ratio, 4.5, 1)
new_rgb = lightness.find(orange.rgb, yellow.rgb)
new_color = Color(new_rgb)
self.assertTrue(new_color.is_same_color(white))
self.assertLess(new_color.contrast_ratio_against(yellow), 4.5)
new_rgb = lightness.find(yellow.rgb, mintcream.rgb)
new_color = Color(new_rgb)
self.assertTrue(new_color.is_same_color(white))
self.assertLess(new_color.contrast_ratio_against(yellow), 4.5)
new_rgb = lightness.find(white.rgb, orange.rgb, 'AAA')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(white)
self.assertEqual(new_color.hex, '#7b5000')
self.assertGreater(new_contrast_ratio, 7.0)
self.assertAlmostEqual(new_contrast_ratio, 7, 1)
new_rgb = lightness.find(white.rgb, green.rgb, 'AAA')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(white)
self.assertEqual(new_color.hex, '#006800')
self.assertGreater(new_contrast_ratio, 7.0)
self.assertAlmostEqual(new_contrast_ratio, 7, 1)
new_rgb = lightness.find(green.rgb, blue.rgb, 'AAA')
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(green)
self.assertTrue(new_color.is_same_color(black))
self.assertLess(new_contrast_ratio, 7.0)
new_rgb = lightness.find(white.rgb, orange.rgb, 6.5)
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(white)
self.assertEqual(new_color.hex, '#825400')
self.assertGreater(new_contrast_ratio, 6.5)
self.assertAlmostEqual(new_contrast_ratio, 6.5, 1)
new_rgb = lightness.find(white.rgb, green.rgb, 6.5)
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(white)
self.assertEqual(new_color.hex, '#006e00')
self.assertGreater(new_contrast_ratio, 6.5)
self.assertAlmostEqual(new_contrast_ratio, 6.5, 1)
new_rgb = lightness.find(green.rgb, blue.rgb, 6.5)
new_color = Color(new_rgb)
new_contrast_ratio = new_color.contrast_ratio_against(green)
self.assertTrue(new_color.is_same_color(black))
self.assertLess(new_contrast_ratio, 6.5)
