hadley/ggplot2 — pull request #553 by jiho (2012-05-11 11:07:43+00:00)
Title: Allow equal width violins

* Reformat stat_ydensity to look more like stat_density.

* Also get coding cues from stat_boxplot.

* Introduce a new scale options to have equal width (useful when
comparing observations with very different densities).

* Keep all computed densities and use a new variable to compute
the density actually used to plot the violin.