Plot only one side/half of the violin plot

Question

I would like to have only one half of violin plots (similar to the plots created by stat_density_ridges from ggridges). A MWE

library(ggplot2)

dframe = data         


        

Answer 1

Package see has also a function geom_violinhalf that seems to do exactly what you want (see right plot below). It behaves mostly like geom_violin(), except does not have all arguments geom_violin() has (missing for example draw_quantiles)

library(ggplot2)
library(see)


p <- ggplot(mtcars, aes(factor(cyl), mpg))
p1 <- p + geom_violin()+ ggtitle("geom_violin")
p2 <- p + see::geom_violinhalf()+ ggtitle("see::geom_violinhalf")

## show them next to each other
library(patchwork)
p1+p2

^{Created on 2020-04-30 by the reprex package (v0.3.0)}