geom_car: Cars
In brodieG/ggbg: Assorted GGPlot Extensions

Description Usage Arguments Aesthetics Examples

A geom that displays cars. This geom was implemented on a lark as an answer to a question on SO.

1 2	geom_car(mapping = NULL, data = NULL, ..., inherit.aes = TRUE, show.legend = NA)

`mapping`	Set of aesthetic mappings created by `aes()` or `aes_()`. If specified and `inherit.aes = TRUE` (the default), it is combined with the default mapping at the top level of the plot. You must supply `mapping` if there is no plot mapping.
`data`	The data to be displayed in this layer. There are three options: If `NULL`, the default, the data is inherited from the plot data as specified in the call to `ggplot()`. A `data.frame`, or other object, will override the plot data. All objects will be fortified to produce a data frame. See `fortify()` for which variables will be created. A `function` will be called with a single argument, the plot data. The return value must be a `data.frame.`, and will be used as the layer data.
`...`	additional arguments passed on to `ggplot::layer`.
`inherit.aes`	If `FALSE`, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. `borders()`.
`show.legend`	logical. Should this layer be included in the legends? `NA`, the default, includes if any aesthetics are mapped. `FALSE` never includes, and `TRUE` always includes. It can also be a named logical vector to finely select the aesthetics to display.

geom_car understands the following aesthetics (required aesthetics are in bold):

x
y
length
width
alpha
colour
fill
group
linetype
size

Learn more about setting these aesthetics in vignette("ggplot2-specs")

library(ggplot2)
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())