Prawn::Graph adds straightforward native graph drawing to Prawn without the need to depend on anything else. All generated graphs are pure PDF Vector Images. It results in smaller document sizes and less complication.
This is an article written by Michael Gray which was published by the National Collective and has been reproduced in full. It (and their website) are currently down due to legal action brought about by the subject of the article.
I don’t make any claim for its accuracy, I just really don’t like censorship. Read it. Make up your own mind.