README.md
In brodieG/ggbg: Assorted GGPlot Extensions

Assorted experimental ggplot2 extensions. This package is partly a learning exercise for myself, so not all contents will be useful to others.

A position adjustment that both stacks and dodges bars to create waterfall charts:

set.seed(1)
p <- ggplot(data.frame(x=1:20, y=rnorm(20)), aes(x=x, y=y, fill=y > 0))
p + geom_col()
p + geom_col(position='waterfall')

plot of chunk waterfall

It is primarily intended for geom_col, but can be used with arbitrary geoms:

p + geom_point()
p + geom_point(position=position_waterfall(vjust=1))

plot of chunk geoms

If you use arbitrary geoms you may need to adjust position with vjust as we do here as otherwise the graphical elements are centered between the end of the previous cumulative value and the beginning of the next. Please see ?position_watefall for details.

It is can also be used with stats:

dat.norm <- data.frame(x=rnorm(1000))
ggplot(dat.norm, aes(x=x)) + stat_bin()
ggplot(dat.norm, aes(x=x)) + stat_bin(position='waterfall')

plot of chunk stats

For more examples try example(position_waterfall, package='ggbg').

Plot cars! This geom was implemented on a lark as an answer to an SO Question.

ggplot(
  geom.car.data,  # ggbg data set
  aes(x=x, y=y, length=length, width=width, fill=label)
) +
geom_hline(yintercept=seq(5, 35, by=10), color="white", size=2, linetype=2) +
geom_car() +
coord_equal() +
theme(panel.background = element_rect(fill="#555555"),
  panel.grid.major = element_blank(),
  panel.grid.minor = element_blank())

plot of chunk geom-car

This package is currently github-only. You can get it with devtools::install_github('brodieg/ggbg') or:

f.dl <- tempfile()
f.uz <- tempfile()
github.url <- 'https://github.com/brodieG/ggbg/archive/master.zip'
download.file(github.url, f.dl)
unzip(f.dl, exdir=f.uz)
install.packages(file.path(f.uz, 'ggbg-master'), repos=NULL, type='source')
unlink(c(f.dl, f.uz))

ggplot2

R Core for developing and maintaining such a wonderful language.
CRAN maintainers, for patiently shepherding packages onto CRAN and maintaining the repository, and Uwe Ligges in particular for maintaining Winbuilder.
Hadley Wickham for ggplot2, and in particular for making it so easily extensible.
Jim Hester because covr rocks.
Dirk Eddelbuettel and Carl Boettiger for the rocker project, and Gábor Csárdi and the R-consortium for Rhub, without which testing bugs on R-devel and other platforms would be a nightmare.
Hadley Wickham for devtools and with Peter Danenberg for roxygen2.
Yihui Xie for knitr and J.J. Allaire etal for rmarkdown, and by extension John MacFarlane for pandoc.
All open source developers out there that make their work freely available for others to use.
Github, Travis-CI, Codecov, Vagrant, Docker, Ubuntu, Brew for providing infrastructure that greatly simplifies open source development.
Free Software Foundation for developing the GPL license and promotion of the free software movement.