Experiments with ruby-processing (processing-2.2.1) and JRubyArt for processing-3.0

Wednesday, 29 October 2014

Toxiclibs (or any other processing library) as a rubygem

As a proof of principle I have created gem that wraps some of Karsten Schmidts (aka toxi @toxi, aka postspectacular k@thi.ng) toxiclibs as a ruby-gem. This gem has been shown to usable with ruby-processing (or its development version JRubyArt) but if yokolet is right it can also be used with clojure, and other jvm languages (by using JRuby Embed, formerly RedBridge). Here is more on RedBridge and clojure.
require 'toxiclibs'

include Toxi

# <p>GrayScottToneMap shows how to use the ColorGradient & ToneMap classes of the
# colorutils package to create a tone map for rendering the results of
# the Gray-Scott reaction-diffusion.</p>
# <p><strong>Usage:</strong><ul>
# <li>click + drag mouse to draw dots used as simulation seed</li>
# <li>press any key to reset</li>
# </ul></p>

# Copyright (c) 2010 Karsten Schmidt
# This demo & library is free software you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation either
# version 2.1 of the License, or (at your option) any later version.
# http://creativecommons.org/licenses/LGPL/2.1/
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY without even the implied warranty of
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with this library if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA


attr_reader :gs, :tone_map

def setup
  @gs= Toxi::GrayScott.new width,height, false
  @gs.set_coefficients 0.021, 0.076, 0.12, 0.06
  # create a color gradient for 256 values
  grad = Toxi::ColorGradient.new
  # NamedColors are preset colors, but any TColor can be added
  # see javadocs for list of names:
  # http://toxiclibs.org/docs/colorutils/toxi/color/NamedColor.html
  # NB: use '::' in place of '.' here for these java constants
  grad.add_color_at(0, Toxi::NamedColor::BLACK)
  grad.add_color_at(128, Toxi::NamedColor::RED)
  grad.add_color_at(192, Toxi::NamedColor::YELLOW)
  grad.add_color_at(255, Toxi::NamedColor::WHITE)
  # this gradient is used to map simulation values to colors
  # the first 2 parameters define the min/max values of the
  # input range (Gray-Scott produces values in the interval of 0.0 - 0.5)
  # setting the max = 0.33 increases the contrast
  @tone_map = Toxi::ToneMap.new 0, 0.33, grad

def draw
  @gs.set_rect(mouse_x, mouse_y, 20, 20) if mouse_pressed?
  # update the simulation a few time steps
  NUM_ITERATIONS.times { @gs.update(1) }
  # read out the V result array
  # and use tone map to render colours
  gs.v.length.times do |i|
    pixels[i]=tone_map.getARGBToneFor(gs.v[i])  # NB: don't camel case convert here

def key_pressed

Here is another example running a JRubyArt sketch from netbeans.

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I have developed JRubyArt and propane new versions of ruby-processing for JRuby- and processing-3.2.2