methods.layered.Rd
\name{methods.layered}
\Rdversion{1.1}
\alias{methods.layered} %DoNotExport
\alias{shift.layered}
\alias{reflect.layered}
\alias{flipxy.layered}
\alias{rotate.layered}
\alias{affine.layered}
\alias{rescale.layered}
\alias{scalardilate.layered}
\title{
Methods for Layered Objects
}
\description{
Methods for geometrical transformations of
layered objects (class \code{"layered"}).
}
\usage{
\method{shift}{layered}(X, vec=c(0,0), ...)
\method{rotate}{layered}(X, ..., centre=NULL)
\method{affine}{layered}(X, ...)
\method{reflect}{layered}(X)
\method{flipxy}{layered}(X)
\method{rescale}{layered}(X, s, unitname)
\method{scalardilate}{layered}(X, ...)
}
\arguments{
\item{X}{
Object of class \code{"layered"}.
}
\item{\dots}{
Arguments passed to the relevant methods
when applying the operation to each layer of \code{X}.
}
\item{s}{
Rescaling factor passed to the relevant method for
\code{\link{rescale}}. May be missing.
}
\item{vec}{
Shift vector (numeric vector of length 2).
}
\item{centre}{
Centre of rotation.
Either a vector of length 2, or a character string
(partially matched to \code{"centroid"}, \code{"midpoint"}
or \code{"bottomleft"}).
The default is the coordinate origin \code{c(0,0)}.
}
\item{unitname}{
Optional. New name for the unit of length.
A value acceptable to the function \code{\link{unitname<-}}
}
}
\details{
These are methods for the generic functions
\code{\link{shift}},
\code{\link{rotate}},
\code{\link{reflect}},
\code{\link{affine}},
\code{\link{rescale}},
\code{\link{scalardilate}} and
\code{\link{flipxy}}
for the class of layered objects.
A layered object represents data that should be plotted in
successive layers, for example, a background and a foreground.
See \code{\link{layered}}.
}
\value{
Another object of class \code{"layered"}.
}
\author{\adrian
and \rolf
}
\seealso{
\code{\link{layered}}
}
\examples{
L <- layered(letterR, runifpoint(20, letterR))
plot(L)
plot(rotate(L, pi/4))
}
\keyword{spatial}
\keyword{methods}