Random color generation

color_support.rb

# Thanks to http://www.paulirish.com/2009/random-hex-color-code-snippets for the idea
module ColorSupport

  # yields a random color
  def self.random_color
    color_for((rand() * ((0xFFFFFF + 1) << 0)).to_i.to_s(16))
  end

  # yields a random color based on the given color
  # credit: http://stackoverflow.com/a/43235
  def self.random_mix_color(base = Color::RGB::Blue)
    red = rand(256)
    green = rand(256)
    blue = rand(256)

    # mix in the base color
    unless base.nil?
      red = (red + base.red) / 2
      green = (green + base.green) / 2
      blue = (blue + base.blue) / 2
    end

    Color::RGB.new(red, green, blue).css_rgb
  end

  # yields a random pastel color
  # credit: http://blog.functionalfun.net/2008/07/random-pastel-colour-generator.html
  def self.random_pastel_color
    red = rand(128) + 62
    green = rand(128) + 62
    blue = rand(128) + 62
    Color::RGB.new(red, green, blue).css_rgb
  end

private

  def self.color_for(value)
    '#' + Array.new(7 - value.length).join('0') + value
  end

end