is.rectangle.Rd
\name{is.rectangle}
\alias{is.rectangle}
\alias{is.polygonal}
\alias{is.mask}
\title{Determine Type of Window}
\description{
Determine whether a window is a
rectangle, a polygonal region, or a binary mask.
}
\usage{
is.rectangle(w)
is.polygonal(w)
is.mask(w)
}
\arguments{
\item{w}{
Window to be inspected. An object of class \code{"owin"}.
}
}
\value{
Logical value, equal to \code{TRUE} if \code{w} is a window
of the specified type.
}
\details{
These simple functions determine whether a window \code{w}
(object of class \code{"owin"}) is
a rectangle (\code{is.rectangle(w) = TRUE}),
a domain with polygonal boundary (\code{is.polygonal(w) = TRUE}),
or
a binary pixel mask (\code{is.mask(w) = TRUE}).
}
\seealso{
\code{\link{owin}}
}
\author{\adrian
and \rolf
}
\keyword{spatial}
\keyword{manip}