QR Encoding via Ruby - with PNG output
Include in your project
In your 'Gemfile', add
In your code, add
NOTE: you'll need to have ImageMagick installed wherever you plan to run this. The gem depends on mojo_magick which uses ImageMagick commandline operations to build the final PNG image.
To use it:
Qr4r::encode(input_string, output_file_path, options)
input_string and output_file_path should be strings. Options should a list of hash options keyed by symbols. Possible options are:
- :pixel_size - specify the size of each 'black' dot in the qrcode. Default = 3
- :border - specify the number of pixels to use for a white border around the outside. Default = 0
To encode the string 'qr codes are the new hotness' like this:
require 'qr4r' s = 'qr codes are the new hotness' fname = s.gsub(/\s+/,"_") + ".qr.png" Qr4r::encode(s, fname)
Make a bigger QRCode
s = 'big qr codes are the new hotness' fname = s.gsub(/\s+/,"_") + ".qr.png" Qr4r::encode(s, fname, :pixel_size => 5)
Add a fat border
s = 'big qr codes are the new hotness with a border' fname = s.gsub(/\s+/,"_") + ".qr.png" Qr4r::encode(s, fname, :border => 20)
You can also checkout the examples folder for a little sample commandline script.
NOTE: The current implementation or rQRCode (and therefore this wrapper library) supports encoding up to 119 characters. Beyond that, you'll need something a bit more sophisticated.
Wanna try it out?
Check out the Sinatra test app here: https://github.com/rcode5/qr4r_test_app
- Moved to new mojo_magick gem
- no longer ruby 1.8.7 compatible
- fixed issue with border coming out black
Thanks to Duncan Robertson for writing rQRCode
- Fork the project
- Write a test for your new feature/method
- Send a pull request
- Don't bump the version or modify the gemspec. I'll do that when I merge in your mods and release a new version.
MIT Licence (http://www.opensource.org/licenses/mit-license.html)