Chartr is a bit of Ruby glue to interface with the Plotr Javascript library, available here: solutoire.com/plotr/
Chartr is written by David N. Welton for DedaSys LLC.
Some time ago I was looking for a charting framework for Prototype and I couldn't find it, just because there's none. So that's where it all started. I came across PlotKit, a well written piece of javascript that enables developers to use Canvas or SVG elements for rendering bar, line and pie charts. The only thing was that PlotKit needed the Mochikit library to work. So I took some parts of PlotKit and wrote some parts myself. The result is a lightweight charting framework (12kb!) named Plotr. It's released under the BSD license.
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