Created
February 28, 2012 14:33
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Sass Color Extensions For HSV
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class Sass::Script::Color < Sass::Script::Literal | |
class << self | |
def new_hsv_float(hue, saturation, value) | |
zero_to_threesixty = lambda { |x| x < 0 ? 0 : (x > 360 ? 360 : x) } | |
zero_to_onehundred = lambda { |x| x < 0 ? 0 : (x > 100 ? 100 : x) } | |
hue = zero_to_threesixty.call((hue * 360.0).round) | |
saturation = zero_to_onehundred.call((saturation * 100.0).round) | |
value = zero_to_onehundred.call((value * 100.0).round) | |
new_hsv(hue, saturation, value) | |
end | |
def new_hsv(hue, saturation, value) | |
new(hsv_to_rgb(hue, saturation, value)) | |
end | |
def rgb_to_hsv(red, green, blue) | |
r = red / 255.0 | |
g = green / 255.0 | |
b = blue / 255.0 | |
max = [r, g, b].max | |
min = [r, g, b].min | |
delta = max - min | |
v = max * 100 | |
if (max != 0.0) | |
s = delta / max *100 | |
else | |
s = 0.0 | |
end | |
if (s == 0.0) | |
h = 0.0 | |
else | |
if (r == max) | |
h = (g - b) / delta | |
elsif (g == max) | |
h = 2 + (b - r) / delta | |
elsif (b == max) | |
h = 4 + (r - g) / delta | |
end | |
h *= 60.0 | |
if (h < 0) | |
h += 360.0 | |
end | |
end | |
[h.round, s.round, v.round] | |
end | |
def hsv_to_rgb(hue, saturation, value) | |
max = lambda { |m,v| m > v ? m : v } | |
min = lambda { |m,v| m < v ? m : v } | |
h = max.call(0, min.call(360, hue)).to_f | |
s = max.call(0, min.call(100, saturation)).to_f | |
v = max.call(0, min.call(100, value)).to_f | |
s = s / 100.0 | |
v = v / 100.0 | |
if s == 0.0 | |
r = g = b = v | |
return [(r * 255).round, (g * 255).round, (b * 255).round] | |
end | |
h = h / 60.0 | |
i = h.floor.to_f | |
f = h - i | |
p = v * (1 - s) | |
q = v * (1 - s * f) | |
t = v * (1 - s * (1 - f)) | |
case i | |
when 0.0 | |
r, g, b = v, t, p | |
when 1.0 | |
r, g, b = q, v, p | |
when 2.0 | |
r, g, b = p, v, t | |
when 3.0 | |
r, g, b = p, q, v | |
when 4.0 | |
r, g, b = t, p, v | |
else | |
r, g, b = v, p, q | |
end | |
[(r * 255).round, (g * 255).round, (b * 255).round]; | |
end | |
def multiply_hsv(color, hd, sd, vd) | |
h = color.hsv_h | |
s = color.hsv_s | |
v = color.hsv_v | |
h = h * hd | |
s = s * sd | |
v = v * vd | |
new_hsv(h, s, v) | |
end | |
end | |
def hsv_h | |
rgb_to_hsv! | |
@attrs[:hsv_h] | |
end | |
def hsv_s | |
rgb_to_hsv! | |
@attrs[:hsv_s] | |
end | |
def hsv_v | |
rgb_to_hsv! | |
@attrs[:hsv_v] | |
end | |
private | |
def rgb_to_hsv! | |
return if @attrs[:hsv_h] && @attrs[:hsv_s] && @attrs[:hsv_v] | |
@attrs[:hsv_h], @attrs[:hsv_s], @attrs[:hsv_v] = self.class.rgb_to_hsv(red, green, blue) | |
end | |
end |
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