rQRCode is a library for encoding QR Codes in Ruby. It has a simple interface with all the standard qrcode options. It was adapted from the Javascript library by Kazuhiko Arase.

Let's clear up some rQRCode stuff.

• rQRCode is a standalone library It requires no other libraries. Just Ruby!
• It is an encoding library. You can't decode QR codes with it.
• The interface is simple and assumes you just want to encode a string into a QR code
• QR code is trademarked by Denso Wave inc

• wikipedia:: http://en.wikipedia.org/wiki/QR_Code
• Denso-Wave website:: http://www.denso-wave.com/qrcode/index-e.html
• kaywa:: http://qrcode.kaywa.com

You may get the latest stable version from Rubygems.

gem install rqrcode

You can also get the latest source from http://github.com/whomwah/rqrcode

git clone git://github.com/whomwah/rqrcode.git

To run the tests:

$ rake

You have installed the gem already, yeah?

require 'rubygems'
require 'rqrcode'

qr = RQRCode::QRCode.new( 'my string to generate', :size => 4, :level => :h )
puts qr.to_s
#
# Prints:
# xxxxxxx x  x x   x x  xx  xxxxxxx
# x     x  xxx  xxxxxx xxx  x     x
# x xxx x  xxxxx x       xx x xxx x
# ... etc

# Controller
@qr = RQRCode::QRCode.new( 'my string to generate', :size => 4, :level => :h )

# View: (minimal styling added)
<style type="text/css">
table {
  border-width: 0;
  border-style: none;
  border-color: #0000ff;
  border-collapse: collapse;
}
td {
  border-width: 0; 
  border-style: none;
  border-color: #0000ff; 
  border-collapse: collapse; 
  padding: 0; 
  margin: 0; 
  width: 10px; 
  height: 10px; 
}
td.black { background-color: #000; }
td.white { background-color: #fff; }
</style>

<table>
<% @qr.modules.each_index do |x| %>
  <tr>  
  <% @qr.modules.each_index do |y| %>
   <% if @qr.dark?(x,y) %>
    <td class="black"/>
   <% else %>
    <td class="white"/>
   <% end %>
  <% end %>
  </tr>
<% end %>
</table>

Original author: Duncan Robertson

Special thanks to the following people for submitting patches:

• Chris Mowforth
• Daniel Schierbeck
• Gioele Barabucci
• Ken Collins
• Rob la Lau
• Tore Darell
• Vladislav Gorodetskiy

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

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