Gruff Graphs

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.

Installation

Add this line to your application's Gemfile:

gem 'gruff'

And then execute:

$ bundle

Or install it yourself as:

$ gem install gruff

Font

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

Usage

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')

Examples

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

Accumulator bar chart

Area chart

Bar chart

Bezier chart

In progress!

Bullet chart

In progress!

Dot chart

Line chart

LineXY chart

Net chart

Pie chart

Scatter chart

Side bar chart

Side stacked bar chart

Spider chart

Stacked area chart

Stacked bar chart

Histogram chart

Documentation

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

Supported Ruby Versions

• Ruby 2.4 or later
• JRuby 9.2.x or later

Development

1. Build docker image

   $ ./docker-build.sh
   

2. Launch docker image

   $ ./docker-launch.sh
   

3. Run tests

   $ 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.

$ rake test:image:update

Contributing

Source

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