% File src/library/graphics/man/clip.Rd
% Part of the R package, http://www.R-project.org
% Copyright 2008-2009 R Core Development Team
% Distributed under GPL 2 or later

\name{clip}
\alias{clip}
\title{Set Clipping Region}
\description{
  Set clipping region in user coordinates
}
\usage{
clip(x1, x2, y1, y2)
}
\arguments{
  \item{x1, x2, y1, y2}{user coordinates of clipping rectangle}
}
\details{
  How the clipping rectangle is set depends on the setting of
  \code{\link{par}("xpd")}: this function changes the current setting
  until the next high-level plotting command resets it.

  Exactly when the clipping region will be reset can be hard to
  predict.  \code{\link{plot.new}} always resets it.
  Functions such as \code{\link{lines}} and \code{\link{text}} only
  reset it if \code{\link{par}("xpd")} has been changed.  However,
  functions such as \code{\link{box}}, \code{\link{mtext}},
  \code{\link{title}} and \code{\link{plot.dendrogram}} can manipulate
  the \code{xpd} setting.
}
\seealso{
  \code{\link{par}}
}
\examples{
x <- rnorm(1000)
hist(x, xlim=c(-4,4))
usr <- par("usr")
clip(usr[1], -2, usr[3], usr[4])
hist(x, col = 'red', add = TRUE)
clip(2, usr[2], usr[3], usr[4])
hist(x, col = 'blue', add = TRUE)
do.call("clip", as.list(usr))  # reset to plot region
}
\keyword{dplot}
