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ripley |
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\name{dev2}
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\alias{dev.copy}
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\alias{dev.print}
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\alias{dev.copy2eps}
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\alias{dev.control}
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\title{Copy Graphics Between Multiple Devices}
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\usage{
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dev.copy(device, \dots, which = dev.next())
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dev.print(device = postscript, \dots)
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dev.copy2eps(\dots)
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dev.control(displaylist = c("inhibit", "enable"))
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}
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\arguments{
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\item{device}{A device function (e.g., \code{x11},
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\code{postscript}, \ldots)}
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\item{\dots}{Arguments to the \code{device} function above.
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For \code{dev.print}, this includes \code{which} and by default any
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\code{\link{postscript}} arguments.}
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\item{which}{A device number specifying the device to copy to}
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\item{displaylist}{A character string: the only valid values are
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\code{"inhibit"} and \code{"enable"}.}
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}
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\description{
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\code{dev.copy} copies the graphics contents of the current device
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to the device specified by \code{which} or to a new device which has
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been created by the function specified by \code{device} (it is an
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error to specify both \code{which} and \code{device}). (If recording
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is off on the current device, there are no contents to copy: this will
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result in no plot or an empty plot.)
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The device copied to becomes the current device.
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\code{dev.print} copies the graphics contents of the current device
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to a new device which has been created by the function specified by
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\code{device} and then shuts the new device.
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\code{dev.copy2eps} is similar to \code{dev.print} but produces an
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EPSF output file, in portrait orientation (\code{horizontal = FALSE})
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\code{dev.control} allows the user to control the recording of
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graphics operations in a device. If \code{displaylist} is \code{"inhibit"}
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(\code{"enable")} then recording is turned off (on). It is only safe
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to change this at the beginning of a plot (just before or just after a
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new page). Initially recording is on for screen devices, and off for
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print devices.
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}
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\value{
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\code{dev.copy} returns the name and number of the device which has
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been copied to.
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\code{dev.print} and \code{dev.copy2eps} return the name and number of
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the device which has been copied from.
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}
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\details{
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For \code{dev.copy2eps}, \code{width} and \code{height} are taken
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from the current device unless otherwise specified. If just one of
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\code{width} and \code{height} is specified, the other is adjusted
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to preserve the aspect ratio of the device being copied. The default
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file name is \code{Rplot.eps}.
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#ifdef unix
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The default for \code{dev.print} is to produce and print a postscript
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copy, if \code{\link{options}("printcmd")} is set suitably.
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#endif
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#ifdef windows
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The default for \code{dev.print} is to produce and print a postscript
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copy. This will not work unless
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\code{\link{options}("printcmd")} is set suitably and you have a
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PostScript printer: see \code{\link{postscript}} for how to set this
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up. Windows users may prefer to use \code{dev.print(win.print)}.
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#endif
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\code{dev.print} is most useful for producing a postscript print
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(its default) when the following applies. Unless
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\code{file} is specified, the plot will be printed. Unless
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\code{width}, \code{height} and \code{pointsize} are specified
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the plot dimensions will be taken from the current device, shrunk
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if necessary to fit on the paper. (\code{pointsize} is rescaled if the
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plot is shrunk.) If \code{horizontal} is not specified and the plot
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can be printed at full size by switching its value this is done
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instead of shrinking the plot region.
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If \code{dev.print} is used with a specified device (even
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\code{postscript}) it sets the width and height in the same way as
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\code{dev.copy2eps}.
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}
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\note{
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Most devices (including all screen devices) have a display list
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which records all of the graphics operations that occur in the device.
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\code{dev.copy} copies graphics contents by copying the display list
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from one device to another device. Also, automatic redrawing of
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graphics contents following the resizing of a device depends on the
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contents of the display list.
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After the command \code{dev.control("inhibit")}, graphics operations
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are not recorded in the display list so that \code{dev.copy} and
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\code{dev.print} will not copy anything and the contents of a device
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will not be redrawn automatically if the device is resized.
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The recording of graphics operations is relatively expensive in
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terms of memory so the command \code{dev.control("inhibit")} can be
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useful if memory usage is an issue.
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}
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\seealso{
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\code{\link{dev.cur}} and other \code{dev.xxx} functions
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}
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\examples{
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\dontrun{
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x11()
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plot(rnorm(10), main="Plot 1")
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dev.copy(device=x11)
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mtext("Copy 1", 3)
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dev.print(width=6, height=6, horizontal=FALSE) # prints it
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dev.off(dev.prev())
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dev.off()
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}
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}
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\keyword{device}
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