Chart Helpers

Chart Helpers is a gem that can parse markdown-like text and turn it into SVG files.

Gantt Chart


Add this line to your application's Gemfile:

gem 'chart_helpers'

And then execute:

$ bundle

Or install it yourself as:

$ gem install charts_helpers


Gantt Chart

require 'charts_helpers'

chart = <<EOF
title My Title
numberFormat .%2f

row 0, :group1, 0.000, 0.100
row 1, :group1, 0.100, 0.200
row 2, :group1, 0.200, 0.300
ChartHelpers.render_chart(chart, 'my_chart.svg')


require 'charts_helpers'

chart = <<EOF
subgraph Name
ChartHelpers.render_chart(chart, 'my_chart.svg')

Supported arrows:

Line Type
A-->B Solid arrow
B---C Solid line
C--text-->D Solid arrow with label
D--text---E Solid line with label
E-.text.->F Dotted arrow with label
F-.->G Dotted arrow
G==>H Bold arrow
H==text===>I Bold line with text

DOT Format

Full support for GraphViz's .dot format

require 'charts_helpers'

chart = <<EOF
graph graphname {
  a -- b -- c;
  b -- d;
ChartHelpers.render_chart(chart, 'my_chart.svg')


After checking out the repo, run bin/setup to install dependencies. It is developed using the ruby version indicated in dev.yml. You will also need the homebrew packages listed in dev.yml, or the corresponding Linux packages if you are using Linux.

Then, run bin/testunit to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at[USERNAME]/ChartHelpers. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.