I had to implement an unsupported feature in the Raphael.js graphing library for a client recently. The graphing libraries, as wonderful as they are, are more of demo code then they are library code, so it took a lot of stack tracing and reverse API reading.

I’ve documented the process on the Bocoup Weblog:

bocoup.com/blog/alternate-x-axis-intervals-in-g-raphael-js-linechart