A tiny module mixin for adding color adjusting methods to a class that responds to color.

Add this line to your application's Gemfile:

gem 'color_adjuster'

And then execute:

$ bundle

Or install it yourself as:

$ gem install color_adjuster

Drop this module in a model or class that responds to color and returns a hex string:

require 'color_adjuster'

class Status
  include ColorAdjuster

  def color
    "#ff0000"
  end
end

Now you can ask it to darken or lighten the color:

status = Status.new
status.darken_color      # => "#660000"
status.lighten_color     # => "#ff4d4d"
status.contrasting_color # => "#ff9999"

You can also pass in an amount to darken/lighten by. For darken_color lower is darker. For lighten_color higher is lighter. The defaults are 0.4 and 0.3, respectively.

status.darken_color 0.6  # => "#990000"
status.lighten_color 0.7 # => "#ffb3b3"

Thanks to this blog post for the code.

1. Fork it ( https://github.com/DiegoSalazar/color_adjuster/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request