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[Sass] Port in compass-colors' adjust_hue function.

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This commit is contained in:
Nathan Weizenbaum 2009-11-26 21:12:42 -08:00
parent 2878d8b895
commit 67b6c576f3
3 changed files with 38 additions and 0 deletions
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3
doc-src/SASS_CHANGELOG.md
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@ -44,6 +44,9 @@ as on colors constructed with the {Sass::Script::Functions#hsl hsl} function.
and {Sass::Script::Functions#desaturate desaturate}
functions adjust the saturation of a color.
* The {Sass::Script::Functions#adjust_hue adjust-hue}
function adjusts the hue of a color.
* The {Sass::Script::Functions#hue hue},
{Sass::Script::Functions#saturation saturation},
and {Sass::Script::Functions#lightness lightness}

19
lib/sass/script/functions.rb
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@ -410,6 +410,25 @@ module Sass::Script
adjust(color, amount, :saturation, 0..100, :-, "%")
end
# Changes the hue of a color while retaining the lightness and saturation.
# Takes a color and a number of degrees (usually between -360 and 360),
# and returns a color with the hue rotated by that value.
#
# For example:
#
# adjust-hue(hsl(120, 30%, 90%), 60deg) => hsl(180, 30%, 90%)
# adjust-hue(hsl(120, 30%, 90%), 060deg) => hsl(60, 30%, 90%)
# adjust-hue(#811, 45deg) => #886a11
#
# @param color [Color]
# @param amount [Number]
# @raise [ArgumentError] If `color` isn't a color, or `number` isn't a number
def adjust_hue(color, degrees)
assert_type color, :Color
assert_type degrees, :Number
color.with(:hue => color.hue + degrees.value)
end
# Converts a decimal number to a percentage.
# For example:
#

16
test/sass/functions_test.rb
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@ -366,6 +366,22 @@ class SassFunctionTest < Test::Unit::TestCase
assert_error_message("\"foo\" is not a number for `desaturate'", "desaturate(#fff, \"foo\")")
end
def test_adjust_hue
assert_equal("#deeded", evaluate("adjust-hue(hsl(120, 30, 90), 60deg)"))
assert_equal("#ededde", evaluate("adjust-hue(hsl(120, 30, 90), -60deg)"))
assert_equal("#886a11", evaluate("adjust-hue(#811, 45deg)"))
assert_equal("black", evaluate("adjust-hue(#000, 45deg)"))
assert_equal("white", evaluate("adjust-hue(#fff, 45deg)"))
assert_equal("#88aa88", evaluate("adjust-hue(#8a8, 360deg)"))
assert_equal("#88aa88", evaluate("adjust-hue(#8a8, 0deg)"))
assert_equal("rgba(136, 106, 17, 0.5)", evaluate("adjust-hue(rgba(136, 17, 17, 0.5), 45deg)"))
end
def test_adjust_hue_tests_types
assert_error_message("\"foo\" is not a color for `adjust-hue'", "adjust-hue(\"foo\", 10%)")
assert_error_message("\"foo\" is not a number for `adjust-hue'", "adjust-hue(#fff, \"foo\")")
end
private
def evaluate(value)