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Generates bumpspark-style sparklines as PNG (including Data URI support) from Ruby and Rails.
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lib Run specs against dummy Rails application
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.document Basic modernization updates
.rspec Convert to RSpec, remove Rails deps for testing
.ruby-version Basic modernization updates
.rvmrc Basic modernization updates
.travis.yml Add Travis CI
Gemfile Basic modernization updates
LICENSE.txt Basic modernization updates Add Code Climate badge, tweak .gitignore
Rakefile Run specs against dummy Rails application
TODO.markdown More doc tweaks.
bumpspark.gemspec Run specs against dummy Rails application


Build Status Code Climate

Generate "bumpspark"-style sparklines from Ruby & Rails. Bumpsparks are sparklines which show discrete data points and highlight extremes.

Note: This library is based on _why's `bumpspark' code, originally discussed and collaborated on at RedHanded.

It has been refactored and built out as a gem suitable for inclusion in Rails projects (and standalone Ruby code).


Thanks to the original collaborators:

  • _why (concept, BMP implementation)
  • jzp (png)
  • MenTaLguY (transparency)


gem install bumpspark


From Rails

Add bumpspark as a dependency:

gem 'bumpspark'

Use bumpspark_tag from your views or helpers, passing it the data points you'd like graphed.

<%= bumpspark_tag [12, 34, 12, 42, 12, 23] %>

From Ruby

Simply create a Bumpspark::Graph instance and call to_png on it.

require 'bumpspark'

graph = [12, 34, 12, 42, 12, 23]'bumpspark.png', 'wb') do |file|
  file.write graph.to_png

From the commandline

Generate a bumpspark directly from the commandline.

% cat temperature.txt
23 25 33 22 25 33 22

% cat temperature.txt | bumpspark > temperature.png

Note on Patches/Pull Requests

Please check the TODO file for information on things that need doing.

  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.


Copyright (c) 2009-2012 Bruce Williams, et al. See LICENSE for details.

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