A new version of ruby-processing is available from ruby-gems.org.
Features easy sketch creator (built in templates), more ruby integration
(constrain is implemented as a custom Range function for example). See
repo here GitHub - jashkenas/ruby-processing: Code as Art, Art as Code. Processing and Ruby are meant for each other., and more worked
examples (from Dan Shiffmans Nature of Code) here
GitHub - ruby-processing/The-Nature-of-Code-Examples: Repository for example code from The Nature of Code book which
have been translated to run with the latest version. Incorporated
ruby-processing-complete-1.7.15 as post install download.