A template sketch for exploring jirb

fred.rb

#!/usr/bin/env jruby
# frozen_string_literal: false
require 'propane'

class Fred < Propane::App
  attr_accessor :back # we can set this variable dynamically
  def settings
    size 300, 300
  end

  def setup
    sketch_title 'Fred'
    @back = 0
    no_loop
  end

  def draw
    background back
    save_frame(data_path("fred###.png")) # save sequentially numbered frames
  end
end