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# rQRCode, Encode QRCodes
## Overview
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
## Resources
* 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
## Installing
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
## Tests
To run the tests:
$ rake
## Loading rQRCode Itself
You have installed the gem already, yeah?
require 'rubygems'
require 'rqrcode'
## Simple QRCode generation to screen
```ruby
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
```
## Simple QRCode generation to template (RubyOnRails)
```erb
# 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>
```
## Authors
Original author: Duncan Robertson
Special thanks to the following people for submitting patches:
* [Gioele Barabucci](https://github.com/gioele)
* [Rob la Lau](https://github.com/ohreally)
* [Chris Mowforth](http://blog.99th.st)
* [Tore Darell](http://tore.darell.no)
* [Daniel Schierbeck](https://github.com/dasch)
* Vladislav Gorodetskiy
## 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)
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