Class: RubyXL::ColorConvenienceClasses::RgbColor

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

Overview

ciintelligence.blogspot.com/2012/02/converting-excel-theme-color-and-tint.html

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#a ⇒ Object

Returns the value of attribute a.


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# File 'lib/rubyXL/convenience_methods/color.rb', line 20

def a
  @a
end

#b ⇒ Object

Returns the value of attribute b.


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# File 'lib/rubyXL/convenience_methods/color.rb', line 20

def b
  @b
end

#g ⇒ Object

Returns the value of attribute g.


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# File 'lib/rubyXL/convenience_methods/color.rb', line 20

def g
  @g
end

#r ⇒ Object

Returns the value of attribute r.


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# File 'lib/rubyXL/convenience_methods/color.rb', line 20

def r
  @r
end

Class Method Details

.parse(str) ⇒ Object

[View source]

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# File 'lib/rubyXL/convenience_methods/color.rb', line 60

def self.parse(str)
  r, g, b, a = str.unpack('A2A2A2A2')

  rgb_color = RgbColor.new
  rgb_color.r = r && r.to_i(16)
  rgb_color.g = g && g.to_i(16)
  rgb_color.b = b && b.to_i(16)
  rgb_color.a = a && a.to_i(16)

  rgb_color
end

Instance Method Details

#to_hls ⇒ Object

[View source]

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# File 'lib/rubyXL/convenience_methods/color.rb', line 22

def to_hls
  hls_color = HlsColor.new

  # Note that we are overriding accessors with local vars here:
  r = self.r / 255.0
  g = self.g / 255.0
  b = self.b / 255.0

  hls_color.a = (self.a || 0) / 255.0

  min = [r, g, b].min
  max = [r, g, b].max
  delta = max - min

  if (max == min) then
    hls_color.h = hls_color.s = 0
    hls_color.l = max
    return hls_color
  end

  hls_color.l = (min + max) / 2

  if (hls_color.l < 0.5) then
    hls_color.s = delta / (max + min);
  else
    hls_color.s = delta / (2.0 - max - min);
  end

  hls_color.h = (g - b) / delta       if (r == max)
  hls_color.h = 2.0 + ((b - r) / delta) if (g == max)
  hls_color.h = 4.0 + ((r - g) / delta) if (b == max)

  hls_color.h *= 60;
  hls_color.h += 360 if hls_color.h < 0

  hls_color
end

#to_s ⇒ Object

[View source]

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# File 'lib/rubyXL/convenience_methods/color.rb', line 72

def to_s
  if a && a != 0 then
    format('%02x%02x%02x%02x', r, g, b, a)
  else
    format('%02x%02x%02x', r, g, b)
  end
end