Class: Hue::Colors::HueSaturation

Inherits:
Color
  • Object
show all
Defined in:
lib/hue/colors/hue_saturation.rb

Constant Summary collapse

HUE_MIN = 
0
HUE_MAX = 
65536.0
HUE_DEGREES = 
360
HUE_SCALE = 
HUE_MAX / HUE_DEGREES
SATURATION_MIN = 
0
SATURATION_MAX = 
255

Constants inherited from Color

Color::ERROR_METHOD_NOT_IMPLEMENTED

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Color

ranged

Constructor Details

#initialize(hue, saturation) ⇒ HueSaturation

Returns a new instance of HueSaturation.



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# File 'lib/hue/colors/hue_saturation.rb', line 17

def initialize(hue, saturation)
  self.hue = hue
  self.saturation = saturation
end

Instance Attribute Details

#hue ⇒ Object

Returns the value of attribute hue.



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# File 'lib/hue/colors/hue_saturation.rb', line 12

def hue
  @hue
end

#saturation ⇒ Object Also known as: sat

Returns the value of attribute saturation.



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# File 'lib/hue/colors/hue_saturation.rb', line 12

def saturation
  @saturation
end

Instance Method Details

#hue_in_degrees ⇒ Object 



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# File 'lib/hue/colors/hue_saturation.rb', line 30

def hue_in_degrees
  self.hue.to_f / HUE_SCALE
end

#hue_in_unit_interval ⇒ Object 



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# File 'lib/hue/colors/hue_saturation.rb', line 34

def hue_in_unit_interval
  hue_in_degrees / HUE_DEGREES
end

#saturation_in_unit_interval ⇒ Object Also known as: sat_in_unit_interval 



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# File 'lib/hue/colors/hue_saturation.rb', line 47

def saturation_in_unit_interval
  self.saturation / SATURATION_MAX.to_f
end

#to_hash ⇒ Object 



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# File 'lib/hue/colors/hue_saturation.rb', line 56

def to_hash
  {hue: hue, sat: saturation}
end

#to_rgb(brightness_in_unit_interval = 1.0) ⇒ Object 



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# File 'lib/hue/colors/hue_saturation.rb', line 60

def to_rgb(brightness_in_unit_interval = 1.0)
  h, s, v = hue_in_unit_interval, saturation_in_unit_interval, brightness_in_unit_interval
  if s == 0 #monochromatic
    red = green = blue = v
  else

    v = 1.0 # We are setting the value to 1. Don't count brightness here
    i = (h * 6).floor
    f = h * 6 - i
    p = v * (1 - s)
    q = v * (1 - f * s)
    t = v * (1 - (1 - f) * s)

    case i % 6
    when 0
      red, green, blue = v, t, p
    when 1
      red, green, blue = q, v, p
    when 2
      red, green, blue = p, v, t
    when 3
      red, green, blue = p, q, v
    when 4
      red, green, blue = t, p, v
    when 5
      red, green, blue = v, p, q
    end
  end

  RGB.new(red * RGB::MAX, green * RGB::MAX, blue * RGB::MAX)
end

#to_s ⇒ Object 



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# File 'lib/hue/colors/hue_saturation.rb', line 52

def to_s
  "Hue=#{self.hue}, Saturation=#{self.saturation}"
end