gistfile1.rb

require 'rubygems'
require 'prawn'
require 'barby'
require 'barby/barcode/qr_code'
require 'barby/outputter/prawn_outputter'

Prawn::Document.generate("barcode.pdf") do |pdf|
  pdf.bounding_box([0, pdf.cursor], :width => 100, :height => 100) do
    Barby::QrCode.new("hello", :level => :h).annotate_pdf(pdf)
  end
  pdf.move_down 200
  pdf.bounding_box([0, pdf.cursor], :width => 100, :height => 100) do
    Barby::QrCode.new("hello\t", :level => :h).annotate_pdf(pdf)
  end
end