Changes

This fork adds a :show_code => true option to svg to output the UPC code below the UPC in the same format you normally see on items at the store. I also made adjustments to the borders making the top border smaller and the bottom border bigger make room for the numbers below the barcode. Font size scales with :xdim option.

Barby

Barby is a Ruby library that generates barcodes in a variety of symbologies.

Its functionality is split into barcode and "outputter" objects:

[Barby::Barcode objects] symbologies turn data into a binary representation for a given symbology.
[Barby::Outputter] outputters then takes this representation and turns it into images, PDF, etc.

You can easily add a symbology without having to worry about graphical representation. If it can be represented as the usual 1D or 2D matrix of lines or squares, outputters will do that for you.

Likewise, you can easily add an outputter for a format that doesn't have one yet, and it will work with all existing symbologies.

For more information, check out [the Barby wiki] wiki.

New require policy

Barcode symbologies are no longer required automatically, so you'll have to require the ones you need.

If you need EAN-13, require 'barby/barcode/ean_13'. Full list of symbologies and filenames below.

Example

require 'barby'
require 'barby/barcode/code_128'
require 'barby/outputter/ascii_outputter'

barcode = Barby::Code128B.new('BARBY')

puts barcode.to_ascii #Implicitly uses the AsciiOutputter

## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
## #    #  #   # ##   # #   ##   ##   # ### #   # ##   ### ## #   ## ### ### ##   ### # ##
          B          A          R          B          Y

Supported symbologies

require 'barby/barcode/<filename>'

Name	Filename	Dependencies
Code 25	`code_25`	─
├─ Interleaved	`code_25_interleaved`	─
└─ IATA	`code_25_iata`	─
Code 39	`code_39`	─
Code 93	`code_93`	─
Code 128	`code_128`	─
└─ GS1 128	`gs1_128`	─
EAN-13	`ean_13`	─
├─ Bookland	`bookland`	─
└─ UPC-A	`ean_13`	─
EAN-8	`ean_8`	─
UPC/EAN supplemental, 2 & 5 digits	`upc_supplemental`	─
QR Code	`qr_code`	`rqrcode`
DataMatrix (Semacode)	`data_matrix`	`semacode`
PDF417	`pdf_417`	JRuby

Outputters

require 'barby/outputter/<filename>_outputter'

filename	dependencies
`ascii`	─
`cairo`	cairo
`html`	─
`pdfwriter`	─
`png`	chunky_png
`prawn`	prawn
`rmagick`	RMagick
`svg`	─

Formats supported by outputters

Text (mostly for testing)
PNG, JPEG, GIF
PS, EPS
SVG
PDF
HTML