\HeaderA{ggrect}{Grob function: rectangle}{ggrect}
\keyword{hplot}{ggrect}
\begin{Description}\relax
Add rectangles to a plot
\end{Description}
\begin{Usage}
\begin{verbatim}ggrect(plot = .PLOT, aesthetics=list(), ..., data=plot$data)\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{plot}] the plot object to modify
\item[\code{aesthetics}] named list of aesthetic mappings, see details for more information
\item[\code{...}] other options, see details for more information
\item[\code{data}] data source, if not specified the plot default will be used
\end{ldescription}
\end{Arguments}
\begin{Details}\relax
The default arguments will draw a barchart.

Aesthetic mappings that this grob function understands:

\Itemize{
\item x: x position (required)
\item y: y position (required)
\item width: width of the rectangle (required)
\item height: height of the rectangle (required)
\item fill: fill colour (see \code{\LinkA{sccolour}{sccolour})}
}

These can be specified in the plot defaults (see \code{\LinkA{ggplot}{ggplot}}) or
in the \code{aesthetics} argument.  If you want to modify the position
of the points or any axis options, you will need to add a position scale to
the plot.  These functions start with \code{ps}, eg.
\code{\LinkA{pscontinuous}{pscontinuous}} or \code{\LinkA{pscategorical}{pscategorical}}

Other options:

\Itemize{
\item justification: justification of the bar relative to its (x, y) location, see \code{\LinkA{rectGrob}{rectGrob} for more details}
\item colour: a character vector describing the line colour}
\end{Details}
\begin{Author}\relax
Hadley Wickham <h.wickham@gmail.com>
\end{Author}
\begin{Examples}
\begin{ExampleCode}p <- ggplot(mtcars, aes=list(y=mpg, x=factor(cyl)))
ggrect(p)
ggrect(p, list(fill=mpg))
pscontinuous(ggrect(p, list(fill=mpg), colour="black"), "y", range=c(0,NA))\end{ExampleCode}
\end{Examples}

