Class: ColorNamerRuby::Distance

Inherits:
Object
  • Object
show all
Defined in:
lib/color_namer_ruby/distance.rb

Class Method Summary collapse

Class Method Details

.distance_between_colours(comparison_colour) ⇒ Object 



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# File 'lib/color_namer_ruby/distance.rb', line 35

def self.distance_between_colours(comparison_colour)
  # https://en.wikipedia.org/wiki/Euclidean_distance#Higher_dimensions
  # closest colours across the different arrays
  # TODO use LAB or HCL instead of HSL
  conversion_1 = @colour.hsl
  conversion_2 = comparison_colour.hsl

  Math.sqrt((conversion_1[:h] - conversion_2[:h])**2 + (conversion_1[:s] - conversion_2[:s])**2 + (conversion_1[:l] - conversion_2[:l])**2)
end

.get_colour_distances_in_list(colour_list) ⇒ Object 



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# File 'lib/color_namer_ruby/distance.rb', line 27

def self.get_colour_distances_in_list(colour_list)
  colour_list.map do |swatch|
    swatch[:distance] = self.distance_between_colours(ColorConversion::Color.new(swatch.dig(:hex)))
  end

  colour_list
end

.get_names_from_hex(hex, pick, omit, limit) ⇒ Object 



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# File 'lib/color_namer_ruby/distance.rb', line 9

def self.get_names_from_hex(hex, pick, omit, limit)
  @colour = ColorConversion::Color.new(hex)

  colour_lists = []

  ColorNamerRuby.list_collections.each do |collection_name|
    next unless (pick.empty? || pick.include?(collection_name)) && !omit.include?(collection_name)

    colour_lists += self.get_colour_distances_in_list(Object.const_get("ColorSwatchCollection::#{collection_name.classify}").colours)
  end

  colour_lists = colour_lists.flatten.compact.reject(&:empty?)

  limit = colour_lists.length if limit.negative?

  colour_lists.sort_by { |swatch| swatch[:distance] }.take(limit)
end