Class: Cheers::Color

Inherits:
Object
  • Object
show all
Defined in:
lib/cheers/color.rb

Overview

Represents a color and allows to compare to others (maybe)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(color = '#000000') ⇒ Color

Create new color from a hex value



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# File 'lib/cheers/color.rb', line 8

def initialize(color = '#000000')
  hex_string = color[1..6]
  self.r = hex_string[0..1].to_i(16)
  self.g = hex_string[2..3].to_i(16)
  self.b = hex_string[4..5].to_i(16)
end

Instance Attribute Details

#b ⇒ Object

Returns the value of attribute b.



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# File 'lib/cheers/color.rb', line 5

def b
  @b
end

#g ⇒ Object

Returns the value of attribute g.



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# File 'lib/cheers/color.rb', line 5

def g
  @g
end

#r ⇒ Object

Returns the value of attribute r.



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# File 'lib/cheers/color.rb', line 5

def r
  @r
end

Class Method Details

.rgb_to_hex(rgb) ⇒ Object 



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# File 'lib/cheers/color.rb', line 58

def self.rgb_to_hex(rgb)
  hex = rgb.map {|c| c.to_s(16).rjust(2, '0')}.join
  return "##{hex}"
end

Instance Method Details

#similar?(other_color, threshold = 0.1) ⇒ Boolean 



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# File 'lib/cheers/color.rb', line 41

def similar?(other_color, threshold = 0.1)
  other_color = Color.new(other_color) unless other_color.is_a? Color
  
  color_hsv       = to_hsv
  other_color_hsv = other_color.to_hsv
  
  d_hue        = (color_hsv[0] - other_color_hsv[0]).abs / 360
  d_saturation = (color_hsv[1] - other_color_hsv[1]).abs
  d_value      = (color_hsv[2] - other_color_hsv[2]).abs
  
  if d_hue <= threshold and d_saturation <= threshold and d_value <= threshold
    true
  else
    false
  end
end

#to_hsv ⇒ Object 



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# File 'lib/cheers/color.rb', line 22

def to_hsv
  red, green, blue = [r, g, b].collect {|x| x / 255.0}
  max = [red, green, blue].max
  min = [red, green, blue].min

  if min == max
    hue = 0
  elsif max == red
    hue = 60 * ((green - blue) / (max - min))
  elsif max == green
    hue = 60 * ((blue - red) / (max - min)) + 120
  elsif max == blue
    hue = 60 * ((red - green) / (max - min)) + 240
  end

  saturation = (max == 0) ? 0 : (max - min) / max
  [hue % 360, saturation, max]
end

#to_s ⇒ Object 



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# File 'lib/cheers/color.rb', line 16

def to_s
  return '#' + r.to_s(16).rjust(2, '0') +
               g.to_s(16).rjust(2, '0') +
               b.to_s(16).rjust(2, '0')
end