The Gruff Graphing Library is a project to make beautiful graphs with Ruby created by Geoffrey Grosenbach. It Can be used alone or with Ruby on Rails. This library allow us to graph negative numbers (line and bar), specify colors, and customize the graphs in other ways.
Demo: http://geoffreygrosenbach.com/projects/show/5
Website: http://nubyonrails.com/pages/gruff
License: MIT License
Is that it? 3 lines and a picture for a library which is pretty well known in the ruby community and can be found with seconds of doing a simple search for graphing libraries.
I was expecting at least a tutorial or something that really shows what it can do.
You can also use Scruffy, flotr and openflashcharts which offers choice between images, JS and Flash powered charts. The rubytoolbox site gives a good rundown.
Honestly, the things people post to try and get page-hits.
Thanks RJ for your info, i like ryby, in the future i will post more about ruby especialy ryby library or component.