LensProtocol

A Ruby parser and builder for the OMA protocol (a.k.a. Data Communication Standard) that was developed by the Lens Processing & Technology Division of The Vision Council for interconnection of optical laboratory equipment.

Furthermore, it allows you to generate a SVG representation of the tracing datasets.

Installation

gem 'lens_protocol'

Usage

Parsing an OMA file

require 'lens_protocol'
message = LensProtocol::OMA.parse(File.read('examples/oma/R360_1.oma'))
message.value_of('SPH') # => [1.25, -0.5]

Generating an OMA file

message = LensProtocol::OMA.generate(
  'JOB' => 42,
  'SPH' => [1.25, -0.5]
)
puts message
# =>
# JOB=42
# SPH=1.25;-0.50

Generating the Tracing SVG

The message.to_svg method returns an array of SVG strings, one for each side, which can be used directly in an ERB template, like this:

<div class="lenses-container">
  <% message.to_svg.map do |svg| %>
    <div class="lens">
      <%= svg %>
    </div>
  <% end %>
</div>

And it should look like this:

Sample Image

To customize the styles, please check out the provided sample stylesheet.

Development

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

There's also a Sinatra app which allows you visualize the generated SVG. To start the server do bundle exec ruby examples/svg.rb and go to http://localhost:4567/

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/eeng/lens_protocol. 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.

Code of Conduct

Everyone interacting in the LensProtocol project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.