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  \item{col}{the color for filling the polygon.
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  \item{col}{the color for filling the polygon.
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    The default, \code{NA}, is to leave polygons unfilled.}
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    The default, \code{NA}, is to leave polygons unfilled.}
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  \item{border}{the color to draw the border.  The default, \code{NULL},
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  \item{border}{the color to draw the border.  The default, \code{NULL},
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    uses \code{\link{par}("fg")}.  Use \code{border = NA} to omit borders.
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    uses \code{\link{par}("fg")}.  Use \code{border = NA} to omit borders.
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    For compatibility with S, \code{border} can also be logical, it
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    For compatibility with S, \code{border} can also be logical, in
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    which case \code{FALSE} is equivalent to \code{NA} (borders omitted)
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    which case \code{FALSE} is equivalent to \code{NA} (borders omitted)
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    and \code{TRUE} is equivalent to \code{NULL} (use the foreground colour),
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    and \code{TRUE} is equivalent to \code{NULL} (use the foreground colour),
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  }
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  }
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  \item{lty}{the line type to be used, as in \code{\link{par}}.}
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  \item{lty}{the line type to be used, as in \code{\link{par}}.}
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  \item{xpd}{(where) should clipping take place?  Defaults to
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  \item{xpd}{(where) should clipping take place?  Defaults to
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  the values of \code{density}, \code{angle}, \code{col}, \code{border},
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  the values of \code{density}, \code{angle}, \code{col}, \code{border},
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  and \code{lty} are recycled in the usual manner.
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  and \code{lty} are recycled in the usual manner.
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}
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}
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\section{Bugs}{
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\section{Bugs}{
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  The present shading algorithm can produce incorrect results for
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  The present shading algorithm can produce incorrect results for
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  self-intesecting polygons.
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  self-intersecting polygons.
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}
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}
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\author{The code implementing polygon shading was donated by
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\author{The code implementing polygon shading was donated by
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  Kevin Buhr \email{buhr@stat.wisc.edu}.}
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  Kevin Buhr \email{buhr@stat.wisc.edu}.}
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}
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}
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\references{
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\references{