\HeaderA{xfig}{XFig Graphics Device}{xfig}
\keyword{device}{xfig}
\begin{Description}\relax
\code{xfig} starts the graphics device driver for producing XFig
(version 3.2) graphics.

The auxiliary function \code{ps.options} can be used to set and view
(if called without arguments) default values for the arguments to
\code{xfig} and \code{postscript}.
\end{Description}
\begin{Usage}
\begin{verbatim}
xfig(file = ifelse(onefile, "Rplots.fig", "Rplot%03d.fig"),
     onefile = FALSE, encoding = "none",
     paper = "default", horizontal = TRUE,
     width = 0, height = 0, family = "Helvetica",
     pointsize = 12, bg = "transparent", fg = "black",
     pagecentre = TRUE)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{file}] a character string giving the name of the file.   For use
with \code{onefile = FALSE} give a C integer format such as
\code{"Rplot\%03d.fig"} (the default in that case).
(See \code{\LinkA{postscript}{postscript}} for further details.)

\item[\code{onefile}] logical: if true allow multiple figures
in one file. If false, assume only one page per file and generate a
file number containing the page number.
\item[\code{encoding}] The encoding in which to write text strings.  The
default is not to re-encode.  This can be any encoding recognized by
\code{\LinkA{iconv}{iconv}}: in a Western UTF-8 locale you probably want to
select an 8-bit encoding such as \code{latin1}, and in an East Asian
locale an \code{EUC} encoding.  If re-encoding fails, the text
strings will be written in the current encoding with a warning.
\item[\code{paper}] the size of paper region.  The choices
are \code{"A4"}, \code{"Letter"} and \code{"Legal"} (and these
can be lowercase).  A further choice is \code{"default"}, which
is the default.  If this is selected, the papersize is taken
from the option \code{"papersize"} if that is set to a non-empty
value, otherwise \code{"A4"}.
\item[\code{horizontal}] the orientation of the printed image, a
logical.  Defaults to true, that is landscape orientation.
\item[\code{width, height}] the width and height of the
graphics region in inches.  The default is to use the entire
page less a 0.5 inch overall margin in each direction.  (See
\code{\LinkA{postscript}{postscript}} for further details.)
\item[\code{family}] the font family to be used.  This must be one
of \code{"AvantGarde"}, \code{"Bookman"}, \code{"Courier"},
\code{"Helvetica"} (the default), \code{"Helvetica-Narrow"},
\code{"NewCenturySchoolbook"}, \code{"Palatino"} or
\code{"Times"}.  Any other value is replaced by
\code{"Helvetica"}, with a warning.
\item[\code{pointsize}] the default point size to be used.
\item[\code{bg}] the initial background color to be used.
\item[\code{fg}] the initial foreground color to be used.
\item[\code{pagecentre}] logical: should the device region be centred on the
page?
\end{ldescription}
\end{Arguments}
\begin{Details}\relax
Although \code{xfig} can produce multiple plots in one file, the XFig
format does not say how to separate or view them.  So
\code{onefile = FALSE} is the default.

The \code{file} argument is interpreted as a C integer format as used
by \code{\LinkA{sprintf}{sprintf}}, with integer argument the page number.
The default gives files \file{Rplot001.fig}, \dots, \file{Rplot999.fig},
\file{Rplot1000.fig}, \dots.  

Line widths as controlled by \code{par(lwd=)} are in multiples of
5/6*1/72 inch.  Multiples less than 1 are allowed.  \code{pch="."} with
\code{cex = 1} corresponds to a square of side 1/72 inch.  

Windows users can make use of WinFIG
(\url{http://www.schmidt-web-berlin.de/WinFIG.htm}, shareware).
\end{Details}
\begin{Section}{Conventions}
This section describes the implementation of the conventions for
graphics devices set out in the \dQuote{R Internals Manual}.

\Itemize{
\item The default device size is the paper size with a 0.25 inch
border on all sides.
\item Font sizes are in big points.
\item The default font family is Helvetica.
\item Line widths are integers, multiples of 5/432 inch.
\item Circle radii are multiples of 1/1200 inch.
\item Colours are interpreted by the viewing/printing application.
}
\end{Section}
\begin{Note}\relax
Only some line textures (\code{0 <= lty < 4}) are used.  Eventually this
may be partially remedied, but the XFig file format does not allow as
general line textures as the \R{} model.  Unimplemented line textures
are displayed as \emph{dash-double-dotted}.

There is a limit of 512 colours (plus white and black) per file.
\end{Note}
\begin{SeeAlso}\relax
\code{\LinkA{Devices}{Devices}},
\code{\LinkA{postscript}{postscript}},
\code{\LinkA{ps.options}{ps.options}}.
\end{SeeAlso}

