\HeaderA{ggpoint}{Grob function: point}{ggpoint}
\keyword{hplot}{ggpoint}
\begin{Description}\relax
Add points to a plot
\end{Description}
\begin{Usage}
\begin{verbatim}ggpoint(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
Aesthetic mappings that this grob function understands:

\Itemize{
\item x: x position (required)
\item y: y position (required)
\item size: size of the point, in mm (see \code{\LinkA{scsize}{scsize})}
\item shape: shape of the glyph used to draw the point (see \code{\LinkA{scshape}{scshape})}
\item colour: point 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 unique: if \code{TRUE, draw at most one point at each unique location}
}
\end{Details}
\begin{Author}\relax
Hadley Wickham <h.wickham@gmail.com>
\end{Author}
\begin{Examples}
\begin{ExampleCode}p <- ggplot(mtcars, aesthetics=list(x=wt, y=mpg))
ggpoint(p)
ggpoint(p, list(colour=cyl))
ggpoint(p, list(blahbalh=cyl)) #unknown aesthetics are ignored
ggpoint(p, list(shape=cyl))
ggpoint(p, list(shape=cyl, colour=cyl))
ggpoint(p, list(size=mpg))
ggpoint(p, list(size=mpg/wt))
ggpoint(p, list(x=cyl, colour=cyl))
p <- ggplot(mtcars)
ggpoint(p, aesthetics=list(x=wt, y=mpg))\end{ExampleCode}
\end{Examples}

