Exporting cf3ruby directly to 'large' pdf

With the processing pdf export library it is easy to export processing sketches to pdf. This is also true for ruby-processing sketches, including those using the cf3ruby library see example below:-

# levy.rb ruby-processing NB: :alpha is now implemented ruby-processing
require 'cf3', 'pdf'
include_package 'processing.pdf'

def setup_the_levy
  @levy = ContextFree.define do
    shape :start do
      levy brightness: 0.9
    end
    shape :levy do
      square alpha: 0.1
     split do
        levy  size: 1/Math.sqrt(2), rotation: -45, x: 0.5, brightness: 0.9
        rewind
        levy  size: 1/Math.sqrt(2), rotation: 45, x: 0.5, brightness: 0.9
     end
    end
  end
end


def setup
  size 2000, 2000, PDF, "levy.pdf"
  setup_the_levy
  smooth
  draw_it
end


def draw
  exit
end


def draw_it
  background 255
  @levy.render :start, size: 250,  stop_size: 2,
        start_x: width/4, start_y: height/2
end