novus/nvd3 — pull request #666 by sylvinus (2014-09-12 17:44:30+00:00)
Title: Better default colors

Pick all the "main" colors from the scale first before picking their lighter versions.

cf. https://github.com/mbostock/d3/wiki/Ordinal-Scales

If you have a graph with just 2 colors, they would be 2 shades of blue without this patch.