Class: Stylegen::Color

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

Constant Summary collapse

SIX_DIGIT_HEX_REGEX = 
/^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/.freeze
THREE_DIGIT_HEX_REGEX = 
/^#?([a-f\d])([a-f\d])([a-f\d])$/.freeze
MAX_PRECISION = 
16

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(red, green, blue, alpha) ⇒ Color

Returns a new instance of Color.



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# File 'lib/stylegen/colors/color.rb', line 11

def initialize(red, green, blue, alpha)
  @red = red
  @green = green
  @blue = blue
  @alpha = alpha
end

Instance Attribute Details

#alpha ⇒ Object (readonly)

Returns the value of attribute alpha.



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# File 'lib/stylegen/colors/color.rb', line 5

def alpha
  @alpha
end

#blue ⇒ Object (readonly)

Returns the value of attribute blue.



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# File 'lib/stylegen/colors/color.rb', line 5

def blue
  @blue
end

#green ⇒ Object (readonly)

Returns the value of attribute green.



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# File 'lib/stylegen/colors/color.rb', line 5

def green
  @green
end

#red ⇒ Object (readonly)

Returns the value of attribute red.



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# File 'lib/stylegen/colors/color.rb', line 5

def red
  @red
end

Class Method Details

.from_hex(hex, alpha = nil) ⇒ Object 



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# File 'lib/stylegen/colors/color.rb', line 18

def self.from_hex(hex, alpha = nil)
  if (match = hex.downcase.match(SIX_DIGIT_HEX_REGEX))
    r = Integer(match.captures[0], 16) / 255.0
    g = Integer(match.captures[1], 16) / 255.0
    b = Integer(match.captures[2], 16) / 255.0
  elsif (match = hex.downcase.match(THREE_DIGIT_HEX_REGEX))
    r = Integer(match.captures[0] * 2, 16) / 255.0
    g = Integer(match.captures[1] * 2, 16) / 255.0
    b = Integer(match.captures[2] * 2, 16) / 255.0
  else
    raise ArgumentError, "Invalid color syntax: #{hex}"
  end

  Color.new(
    r.round(MAX_PRECISION),
    g.round(MAX_PRECISION),
    b.round(MAX_PRECISION),
    alpha || 1.0
  )
end

Instance Method Details

#grayscale? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stylegen/colors/color.rb', line 39

def grayscale?
  @red == @green && @green == @blue
end

#to_s(struct_name, indent = 0) ⇒ Object 



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# File 'lib/stylegen/colors/color.rb', line 43

def to_s(struct_name, indent = 0)
  if grayscale?
    "#{struct_name}(white: #{@red}, alpha: #{@alpha})"
  else
    indent_prefix = ' ' * indent

    result = []
    result << "#{struct_name}("
    result << "#{indent_prefix}    red: #{@red},"
    result << "#{indent_prefix}    green: #{@green},"
    result << "#{indent_prefix}    blue: #{@blue},"
    result << "#{indent_prefix}    alpha: #{@alpha}"
    result << "#{indent_prefix})"

    result.join("\n")
  end
end