Takes a HSL (hue saturation, light) value and returns the RGB equivalent

hsl2rgb.coffee

# Filed under: color, convert, hsl, rgb
# Converts hue-saturation-lightness to red-green-blue color value.

###
@param a hue
@param b saturation
@param c lightness
###
hsl2rgb = (a, b, c) ->
  a *= 6
  b = [
    (if c += b *= c < .5 then c else 1 - c),
    c - a % 1 * b * 2,
    c -= b *= 2,
    c,
    c + a % 1 * b,
    c + b
  ]
  
  red = b[~~a % 6]
  green = b[(a|16) % 6]
  blue = b[(a|8) % 6]
  [red, green, blue]