= mongoid_paperclip_image_dimension

This is a simple gem to persist image dimensions of originals and thumbnails for mongoid documents.
It works for both s3 and filesystem storages.
This lib is based on this article: http://stackoverflow.com/questions/4065295/paperclip-saving-the-images-dimentions-width-height

== Installation

You can simply install from rubygems:

  gem install mongoid_paperclip_image_dimension

or in Gemfile:

  gem 'mongoid_paperclip_image_dimension'
  
== Basic Usage

  class Post
    include Mongoid::Document
    include Mongoid::Paperclip
    include Mongoid::Paperclip::ImageDimension
    
    has_mongoid_attached_file :image, :styles => {
      :large    =>    ['350x350>',     :jpg],
      :medium   =>    ['150x150>',     :jpg],
      :small    =>    ['30x30>',       :jpg]
    }
    
    has_mongoid_attached_file :another_image, :styles => {
      :large    =>    ['350x350>',     :jpg],
      :medium   =>    ['150x150>',     :jpg],
      :small    =>    ['30x30>',       :jpg]
    }
    
    # This will save all dimensions of images and thumbnails for both :image and :another_image
    save_image_dimensions_on :image, :another_image
  end
  
  # retrieve image dimensions
  p = Post.first
  p.image_dimensions    # If the original image has width of 2048 and height of 1024, the output should be:
                        #   {
                        #     'original' => [2048, 1024],
                        #     'large'    => [350, 175],
                        #     'medium'   => [150, 75],
                        #     'small'    => [30, 15]
                        #   }
                        
  p.another_image_dimensions    # If the original image has width of 2048 and height of 1024, the output should be:
                                #   {
                                #     'original' => [2048, 1024],
                                #     'large'    => [350, 175],
                                #     'medium'   => [150, 75],
                                #     'small'    => [30, 15]
                                #   }
  }
  
  # some sugar:
  p.image_dimension               # [2048, 1024]
  p.image_dimension(:original)    # [2048, 1024]
  p.image_dimension(:large)       # [350, 175]
  
  p.image_dimension_str             # "2048x1024"
  p.image_dimension_str(:original)  # "2048x1024"
  p.image_dimension_str(:large)     # "350x175"

== Contributing to mongoid_paperclip_image_dimension
 
* Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet
* Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it
* Fork the project
* Start a feature/bugfix branch
* Commit and push until you are happy with your contribution
* Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
* Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

== Copyright

Copyright (c) 2011 Aaron Qian. See LICENSE.txt for
further details.