IIIFManifest

IIIF http://iiif.io/ defines an API for presenting related images in a viewer. This transforms Hydra::Works objects into that format usable by players such as http://universalviewer.io/

Usage

You application must have an object that implements #file_set_presenters and #work_presenters. The former method should return as set of leaf nodes and the later any interstitial nodes. If none are found an empty array should be returned. Additionally it should implement #manifest_url that shows where the manifest can be found. Finally, it must have a #description method that returns a string.

For example:

  class Book
    def initialize(id, pages = [])
      @id = id
      @pages = pages
    end

    def file_set_presenters
      @pages
    end

    def work_presenters
      []
    end

    def manifest_url
      "http://test.host/books/#{@id}/manifest"
    end

    def description
      'a brief description'
    end
  end

The class that represents the leaf nodes, must implement #id. It must also implement #display_image which returns an instance of IIIFManifest::DisplayImage

  class Page
    def initialize(id)
      @id = id
    end

    def id
      @id
    end

    def display_image
      IIIFManifest::DisplayImage.new(id,
                                     width: 100,
                                     height: 100,
                                     format: "image/jpeg",
                                     iiif_endpoint: endpoint
                                     )
    end

    private

      def endpoint
        IIIFManifest::IIIFEndpoint.new("http://test.host/images/#{id}",
                                       profile: "http://iiif.io/api/image/2/level2.json")
      end
  end

Then you can produce the manifest on the book object like this:

  book = Book.new('book-77',[Page.new('page-99')])
  IIIFManifest::ManifestFactory.new(book).to_h.to_json

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/projecthydra-labs/iiif_manifest. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.