web5design / rqrcode_png

Uses rQRCode and chunky_png to produce .png images of QR codes in pure Ruby.

rqrcode_png

Problem: You need to generate your own QR code images
Solution: rqrcode_png

Overview

rqrcode_png extends rqrcode, adding one simple method to instances of QRCode, #to_img. ChunkyPNG is used to generate the image itself in pure Ruby. As few assumptions are made as possible regarding the image itself.

Usage

require 'rqrcode_png'

qr = RQRCode::QRCode.new( 'my string to generate', :size => 4, :level => :h )
png = qr.to_img												# returns an instance of ChunkyPNG
png.resize(90, 90).save("really_cool_qr_image.png")

NOTE: For now, the :size of the QR code has to be 14 or less. Working on this.

Bundler

gem 'rqrcode_png'

Rails

With DragonFly

# app/models/product.rb
class Product < ActiveRecord::Base
  image_accessor :qr_code
end

# somewhere
qr_code_img = RQRCode::QRCode.new('http://www.google.com/', :size => 4, :level => :h ).to_img
@product.update_attribute :qr_code, qr_code_img.to_string

# app/controllers/products.rb
def show
	@product = Product.find(params[:id])
end

# app/views/products/show.html.erb
<%= image_tag @product.qr_code.url %>

Contributing

• Fork the project
• Send a pull request
• Don't touch the .gemspec, I'll do that when I release a new version

Copyright

MIT Licence (http://www.opensource.org/licenses/mit-license.html)