Create and annotate barcodes in Ruby

annotate_barcodes.rb

require 'barby'
require 'barby/barcode/code_128'
require 'barby/outputter/png_outputter'
require 'mini_magick'
require 'benchmark'
 
 # Build a sample barcode
def build_barcode(prod, supplier_code, batch_no)
  bar_code = prod + "-" + supplier_code + "-"+ batch_no
  bar_code_image = bar_code.delete("/") # Clear all /'s in the code if any ..
  path = "#{Rails.root}/public/barcodes/#{bar_code_image}.png"
end

# Create a barcode image object like so ..
@barcode_object = Barby::Code128B.new(bar_code)
# Write the barcode image object to a file => barcode png image
File.open(path, 'w') { |f| f.write @barcode_object.to_png(:margin => 35, :xdim => 2,:ydim => 2, :height => 100) }
  
# Annotate text to barcode image using MiniMagick
def annotate_barcode(path)
  img = MiniMagick::Image.open(path)
    img.combine_options do |c|
      c.font "#{Rails.root}/public/fonts/Calibri.ttf"
      c.fill "black"
      c.pointsize 20
      c.gravity "center"
      c.draw "text 0,65 '#{bar_code}'"
    end
  img.write(path)
end

You can pass more options for annotation. See the mini_magick usage documentation here https://github.com/minimagick/minimagick#usage