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module Compass::SassExtensions::Functions::Colors
# a genericized version of lighten/darken so that negative values can be used.
def adjust_lightness(color, amount)
assert_type color, :Color
assert_type amount, :Number
color.with(:lightness => Compass::Util.restrict(color.lightness + amount.value, 0..100))
end
# Scales a color's lightness by some percentage.
# If the amount is negative, the color is scaled darker, if positive, it is scaled lighter.
# This will never return a pure light or dark color unless the amount is 100%.
def scale_lightness(color, amount)
assert_type color, :Color
assert_type amount, :Number
color.with(:lightness => scale_color_value(color.lightness, amount.value))
end
# a genericized version of saturation/desaturate so that negative values can be used.
def adjust_saturation(color, amount)
assert_type color, :Color
assert_type amount, :Number
color.with(:saturation => Compass::Util.restrict(color.saturation + amount.value, 0..100))
end
# Scales a color's saturation by some percentage.
# If the amount is negative, the color is desaturated, if positive, it is saturated.
# This will never return a pure saturated or desaturated color unless the amount is 100%.
def scale_saturation(color, amount)
assert_type color, :Color
assert_type amount, :Number
color.with(:saturation => scale_color_value(color.saturation, amount.value))
end
# returns an IE hex string for a color with an alpha channel
# suitable for passing to IE filters.
def ie_hex_str(color)
assert_type color, :Color
alpha = (color.alpha * 255).round
alphastr = alpha.to_s(16).rjust(2, '0')
Sass::Script::String.new("##{alphastr}#{color.send(:hex_str)[1..-1]}".upcase)
end
private
def scale_color_value(value, amount)
if amount > 0
value += (100 - value) * (amount / 100.0)
elsif amount < 0
value += value * amount / 100.0
end
value
end
end
Version data entries
27 entries across 27 versions & 3 rubygems