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.

position_waterfall

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')

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))

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')

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

geom_car

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())

Installation

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))

Related Packages

• ggplot2

Acknowledgments

• 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.