Class: ColorDiff::List

Inherits:
Object
  • Object
show all
Defined in:
lib/color_diff/list.rb

Instance Method Summary collapse

Constructor Details

#initialize(items) ⇒ List

items An array of ColorDiff::Colors



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# File 'lib/color_diff/list.rb', line 4

def initialize(items)
  @items = items
end

Instance Method Details

#closest_to(color) ⇒ Object

Compares all items in the list to the supplied color and returns the most similar

color ColorDiff::Color to compare against the list

Example

red    = ColorDiff::Color::RGB.new(255, 0, 0)
blue   = ColorDiff::Color::RGB.new(0, 0, 255)
yellow = ColorDiff::Color::RGB.new(255, 255, 0)
gold   = ColorDiff::Color::RGB.new(255, 215, 0)

list   = ColorDiff::List.new [red, blue, yellow]
list.closest_to(gold) == yellow => true



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# File 'lib/color_diff/list.rb', line 23

def closest_to(color)
  closest_color = nil
  closest_diff = 100

  @items.each do |item|
    diff = ColorDiff.between(color, item)
    if diff < closest_diff
      closest_diff = diff
      closest_color = item
    end
  end

  closest_color
end

#closest_to_map(palette) ⇒ Object

Compares all items in the list against the supplied palette and maps each item to the closest palette color. The resulting hash is returned

palette Array of ColorDiff::Colors to compare against the list

Example

red       = ColorDiff::Color::RGB.new(255, 0, 0)
black     = ColorDiff::Color::RGB.new(0, 0, 0)
dark_gray = ColorDiff::Color::RGB.new(80, 80, 80)
maroon    = ColorDiff::Color::RGB.new(128, 0, 0)

list = ColorDiff::List.new [red, black]
palette = [dark_gray, maroon]

list.closest_to_map(palette) =>
  { 'R255G0B0' => maroon, 'R0B0G0' => dark_gray }



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# File 'lib/color_diff/list.rb', line 57

def closest_to_map(palette)
  map = {}
  options = List.new(palette)
  @items.each do |item|
    map[item.to_s] = options.closest_to item
  end

  map
end