Here is an example sketch by Joshua Davis, from the hype framework that has been changed to make use of ruby syntax. The declared aim of the hype library is to provide:- A collection of classes that performs the heavy lifting so that you can create sketches with the minimum amount of code. When using the hype library to create JRubyArt sketches it is suggested that you not simply ape the hype framework examples, but tailor your sketches to take advantage of the ruby language to create even more elegant code (Code as Art).

Unzip the library in the processing libraries folder, rename the folder hype, rename distribution folder to library, rename the HYPE.jar to hype.jar. Check that you can see the library from the processing-3.2.1 ide. Note that we can use snake case in place of camel case, for constants use :: and not . to call. The important thing to learn from this sketch is how to implement the HCallback interface. This can be implemented as a closure (block), note we do not/should not try and use the vanilla processing method.

In this case we use ruby syntax to dry out the creation of web colors. We first create an array of web color strings PALETTE. We then map those strings to color int values, creating the array palette. We then use the palette in the creation of a new instance ofHColorPool. We could make the code more literate by creating a hash of web colors (and call the colors by human readable names, although for web artists that might not be necessary)?

From the above you should realise that it is very easy to experiment with different palettes using the JRubyArt watch mode (best to load up a few at the outset, but they could also be individually edited, because ruby constants are only constant by convention, but you will get warned). Since JRubyArt-1.0.7 we can make an even more efficient conversion from an array of web string to an array of java color int using the web_to_color_array method, see the nested callbacks post.


# encoding: utf-8
# frozen_string_literal: true
load_library :hype
include_package 'hype'
# Access through Hype namespace
module Hype
  java_import 'hype.extended.colorist.HColorPool'
  java_import 'hype.extended.layout.HGridLayout'

PALETTE = %w(#FFFFFF #F7F7F7 #ECECEC #0095A8 #00616F #333333 #FF3300 #FF6600).freeze

def settings
  size(600, 600)

def setup
  sketch_title 'Color Pool'
  palette = { |col| color(col) }
  colors =  
  pool =
      .layout(, 5).cols(126))
      .on_create do |obj|
        i = pool.current_index