A Gui for my pixelation library

Over on my other blog I recently described an application for pixelating pictures in processing, but also using the cfdg program (CF3), here is the program adapted for ruby-processing, with an added gui using "control_panel"

load_libraries 'pde2cfdg', 'control_panel'
import "pde2cfdg"

#
# Two cfdg files are written to the sketch folder one for design one for data,
# this means it easier to edit the design (eg to replace CIRCLE with a custom shape)
# The output png file is written to the sketch folder,
#

attr_reader :cfdg, :dot_size

def setup
    size(640, 512)
    background(255)
    setup_panel
    colorMode(HSB, 1.0)
    @cfdg = ProcessingToCF.new(self)
    cfdg.set_dot_size(dot_size)
    cfdg.setPathToCFDG("/home/tux/CF3/cfdg")
    cfdg.get_input
    cfdg.writeCFDG
end

def setup_panel
    control_panel do |c|
      c.title = "Control:"
      c.slider(:dot_size, 1..6, 3)
      c.button(:re_run)
    end
end

def re_run
  cfdg.set_dot_size(dot_size)
  cfdg.writeCFDG
end

def draw
  if (cfdg.finished)
    img = load_image(cfdg.outFile)
    image(img, 0, 0, img.width, img.height)
  end
end

Here's a screenshot of application in action, the artist is Phil Sutton RA