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Latest commit 4e827ee Mar 21, 2017 @monkstone monkstone bump versions


Gem Version Travis CI Versions before JRubyArt-1.2.0, are unsupported, please update, preferably to latest version...

Note the main reason for the current build to fail on travis is when the current version of processing is not available from maven central, it has only ever been available by third parties (I am eternally hopeful that one day will see the light), actually rvm with jruby as used by travis-ci is also pretty crap as judged by the build traces.


A clean start for jruby_art that works best with the latest version of processing-3.3 and jruby- see wiki for building gem from this repo. Changes from processing-2.0 to processing-3.0 here. Should work on same platforms as vanilla processing (windows, mac, linux) for Android see Yuki Morohoshi rubuto-processing3.


A suitable version of ruby (MRI ruby 2.3+ or jruby- to download gem.


jdk1.8.0_121+ can be openjdk with OpenJFX a separate download works on ArchLinux, currently FX2D is experimental is expected to replace JAVA2D in the near future see changes above...

recommended installs (JRubyArt is currently hard-coded to expect them)

processing video and sound-1.3.2+ libraries best installed from the processing-3.3 ide


You can if you wish leave configuration to the new autoconfig tool (delete existing config to do this). The config file is config.yml in the ~/.jruby_art folder, the autoconfig gets run on k9 --install expected to just work on macOS, output may need tuning on windows / linux check with k9 --check (run both after gem install for both)

# YAML configuration file for jruby_art
# K9_HOME: "/home/ruby2.3.0 ... /jruby_art" # windows users may need to set this
PROCESSING_ROOT: "/home/tux/processing-3.3" # typical linux shown
# important sketch_book path may be different for processing-3.0
sketchbook_path: "/home/tux/sketchbook"
template: bare
sketch_title: 'Edit Static Sketch' # for static sketch only
width: 600 # for static sketch only
height: 600 # for static sketch only

Install Steps (assumes you have requirements above)

 gem install jruby_art
 k9 --install # installs jruby-complete- and downloads and installs samples to ~/k9_samples
 cd ~/k9_samples/contributed
 k9 --run jwishy.rb # if you have jruby- installed or config `JRUBY: false`
 # to use jruby-complete set `JRUBY: false` in config

Create sketches from built in templates

k9 --create fred 200 200                # basic sketch fred.rb
k9 --create fred 200 200 p2d            # basic P2D sketch fred.rb

To create either a class wrapped sketch or emacs sketch set template: class or template: emacs in config.yml

Simple Sketch

# :sketch_title belongs in --it is a convenience method of jruby_art-3.0+
def setup
  sketch_title 'My Sketch'

def draw
  background 0
  fill 200
  ellipse width / 2, height / 2, 300, 200

# NB: changes for processing-3.0+
# size, full_screen, pixel_density and smooth should all be moved to settings (this is hidden
# to users of processing ide, but not for JRubyArt, or for Eclipse NetBeans users). The FX2D
# rendering mode was introduced, and was expected to replace JAVA2D (as default rendering mode)
# but may not now happen, and not for processing-3.3 in any case.
def settings
  size 400, 300

Run Sketch

See above be prepared to KILL the odd java process (ie when sketch does not exit cleanly)

Watch sketches

k9 --watch sketch.rb # don't try and change render mode, or use FX2D render mode during watch yet

Open pry console on sketch

k9 --live sketch.rb # pry is bound to $app # needs `jruby -S gem install pry`

Example sketches

Worked Examples more to follow, feel free to add your own, especially ruby-2.2+ syntax now we can. These can now be downloaded using k9 --install please move existing k9_samples if you wish to keep them.

Conversion Tool

I wrote this little script to convert sketches from ruby-processing (processing-2) to jruby_art (processing-3.0) here.

See The-Nature-of-Code-Examples-in-Ruby converted to The-Nature-of-Code-Examples-for-JRubyArt using the script.