A library for making beautiful graphs.

Built on top of rmagick; see its web page for a list of the system-level prerequisities (ImageMagick etc) and how to install them.

Add this line to your application's Gemfile:

gem 'gruff'

And then execute:

$ bundle

Or install it yourself as:

$ gem install gruff

Gruff uses Roboto font as default font which is licensed under the Apache License, Version 2.0.

require 'gruff'
g = Gruff::Line.new
g.title = 'Wow!  Look at this!'
g.labels = { 0 => '5/6', 1 => '5/15', 2 => '5/24', 3 => '5/30', 4 => '6/4',
             5 => '6/12', 6 => '6/21', 7 => '6/28' }
g.data :Jimmy, [25, 36, 86, 39, 25, 31, 79, 88]
g.data :Charles, [80, 54, 67, 54, 68, 70, 90, 95]
g.data :Julie, [22, 29, 35, 38, 36, 40, 46, 57]
g.data :Jane, [95, 95, 95, 90, 85, 80, 88, 100]
g.data :Philip, [90, 34, 23, 12, 78, 89, 98, 88]
g.data :Arthur, [5, 10, 13, 11, 6, 16, 22, 32]
g.write('exciting.png')

You can find many examples in the test directory along with their resulting charts in the expected directory.

In progress!

In progress!

http://www.rubydoc.info/github/topfunky/gruff/frames

• Ruby 2.6 or later
• JRuby 9.3.x or later

1. Build docker image

$ ./docker-build.sh

2. Launch docker image

$ ./docker-launch.sh

3. Run tests

$ bundle exec rake

If you have made changes that involve updating the expected image, you need to update the image with the following command after running tests.

$ bundle exec rake test:image:update

The source for this project is now kept at GitHub:

http://github.com/topfunky/gruff

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request