Class: RainbowColors::Convertor

Inherits:
Object
  • Object
show all
Defined in:
lib/rainbow_colors/convertor.rb

Class Method Summary collapse

Class Method Details

.hex_from_hsl(color_hsl) ⇒ Object 



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# File 'lib/rainbow_colors/convertor.rb', line 90

def self.hex_from_hsl(color_hsl)
  rgb = rgb_from_hsl color_hsl
  hex = hex_from_rgb rgb
end

.hex_from_rgb(color_rgb) ⇒ Object

color_rgb => { red: 100, green: 100, blue: 100 }



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# File 'lib/rainbow_colors/convertor.rb', line 14

def self.hex_from_rgb(color_rgb)
  red   = color_rgb[:red]   < 16 ? "0" + color_rgb[:red].to_s(16)   : color_rgb[:red].to_s(16)
  green = color_rgb[:green] < 16 ? "0" + color_rgb[:green].to_s(16) : color_rgb[:green].to_s(16)
  blue  = color_rgb[:blue]  < 16 ? "0" + color_rgb[:blue].to_s(16)  : color_rgb[:blue].to_s(16)
  
  ("##{red}#{green}#{blue}").upcase
end

.hsl_from_hex(color_hex) ⇒ Object 



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# File 'lib/rainbow_colors/convertor.rb', line 85

def self.hsl_from_hex(color_hex)
  rgb = rgb_from_hex color_hex
  hsl = hsl_from_rgb rgb
end

.hsl_from_rgb(color_rgb) ⇒ Object 



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# File 'lib/rainbow_colors/convertor.rb', line 22

def self.hsl_from_rgb(color_rgb)
  red   = color_rgb[:red]   / 255.0
  green = color_rgb[:green] / 255.0
  blue  = color_rgb[:blue]  / 255.0
  
  min = [red, green, blue].min
  max = [red, green, blue].max
  delta_rgb = max - min
  
  luminance = (min + max) / 2
  
  if delta_rgb == 0
    hue = 0
    saturation = 0
  else
    if luminance < 0.5
      saturation = delta_rgb / (max + min)
    else
      saturation = delta_rgb / (2.0 - max - min)
    end
  
    delta_red   = (((max - red)   / 6.0) + (delta_rgb / 2.0)) / delta_rgb
    delta_green = (((max - green) / 6.0) + (delta_rgb / 2.0)) / delta_rgb
    delta_blue  = (((max - blue)  / 6.0) + (delta_rgb / 2.0)) / delta_rgb
    
    hue = case max
          when red
            delta_blue - delta_green
          when green
            1.0/3.0 + delta_red - delta_blue
          when blue
            2.0/3.0 + delta_green - delta_red
          end
  end
  
  hue = hue + 1 if hue < 0
  hue = hue - 1 if hue > 1
  
  { hue: hue * 360, saturation: saturation * 100, luminance: luminance * 100 }
end

.rgb_from_hex(color_hex) ⇒ Object

color_hex => #AB10CD



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# File 'lib/rainbow_colors/convertor.rb', line 5

def self.rgb_from_hex(color_hex)
  red   = (color_hex[1] + color_hex[2]).to_i(16).round
  green = (color_hex[3] + color_hex[4]).to_i(16).round
  blue  = (color_hex[5] + color_hex[6]).to_i(16).round
  
  { red: red, green: green, blue: blue }
end

.rgb_from_hsl(color_hsl) ⇒ Object 



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# File 'lib/rainbow_colors/convertor.rb', line 63

def self.rgb_from_hsl(color_hsl)
  hue = color_hsl[:hue] / 360
  saturation = color_hsl[:saturation] / 100
  luminance  = color_hsl[:luminance]  / 100
  
  red = blue = green = luminance * 255
  
  if saturation != 0
    if luminance < 0.5
      v2 = luminance * (1.0 + saturation)
    else
      v2 = (luminance + saturation) - (luminance * saturation)
    end
    v1 = 2.0 * luminance - v2
    red   = (255 * rgb_from_hue(v1, v2, 1.0/3.0 + hue)).round
    green = (255 * rgb_from_hue(v1, v2, hue)).round
    blue  = (255 * rgb_from_hue(v1, v2, hue - 1.0/3.0)).round
  end
  
  { red: red.round, green: green.round, blue: blue.round }
end