geom_christmas_tree(): a new geom for ggplot2 v2.0

iris2
Version 2.0 of the ggplot2 package (on GitHub) has a very nice mechanism for adding new geoms and stats (more about it here).
Christmas are coming, so maybe one would like to make his plots more tree’ish?
Below you will find a definition of geom_christmas_tree() geom. It supports following aesthetics: size (number of segments), fill, color, x and y.

With mpg data you can plot a colourful forest.

cars

With iris dataset you can plot three hills and few trees.

iris2

Here is the full definition of the geom_christmas_tree() geom (tested with ggplot2 v2.0).

Btw: you still have four days to submit your chRistmas tRee.

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