dev2 {grDevices}R Documentation

Copy Graphics Between Multiple Devices


dev.copy copies the graphics contents of the current device to the device specified by which or to a new device which has been created by the function specified by device (it is an error to specify both which and device). (If recording is off on the current device, there are no contents to copy: this will result in no plot or an empty plot.) The device copied to becomes the current device.

dev.print copies the graphics contents of the current device to a new device which has been created by the function specified by device and then shuts the new device.

dev.copy2eps is similar to dev.print but produces an EPSF output file, in portrait orientation (horizontal = FALSE)

dev.control allows the user to control the recording of graphics operations in a device. If displaylist is "inhibit" ("enable") then recording is turned off (on). It is only safe to change this at the beginning of a plot (just before or just after a new page). Initially recording is on for screen devices, and off for print devices.


dev.copy(device, ..., which =
dev.print(device = postscript, ...)
dev.control(displaylist = c("inhibit", "enable"))


device A device function (e.g., x11, postscript, ...)
... Arguments to the device function above. For dev.print, this includes which and by default any postscript arguments.
which A device number specifying the device to copy to
displaylist A character string: the only valid values are "inhibit" and "enable".


For dev.copy2eps, width and height are taken from the current device unless otherwise specified. If just one of width and height is specified, the other is adjusted to preserve the aspect ratio of the device being copied. The default file name is Rplot.eps.

The default for dev.print is to produce and print a postscript copy, if options("printcmd") is set suitably.

dev.print is most useful for producing a postscript print (its default) when the following applies. Unless file is specified, the plot will be printed. Unless width, height and pointsize are specified the plot dimensions will be taken from the current device, shrunk if necessary to fit on the paper. (pointsize is rescaled if the plot is shrunk.) If horizontal is not specified and the plot can be printed at full size by switching its value this is done instead of shrinking the plot region.

If dev.print is used with a specified device (even postscript) it sets the width and height in the same way as dev.copy2eps. This will not be appropriate unless the device specifies dimensions in inches, in particular not for png, jpeg and (Windows only) bmp.


dev.copy returns the name and number of the device which has been copied to.
dev.print and dev.copy2eps return the name and number of the device which has been copied from.


Most devices (including all screen devices) have a display list which records all of the graphics operations that occur in the device. dev.copy copies graphics contents by copying the display list from one device to another device. Also, automatic redrawing of graphics contents following the resizing of a device depends on the contents of the display list.

After the command dev.control("inhibit"), graphics operations are not recorded in the display list so that dev.copy and dev.print will not copy anything and the contents of a device will not be redrawn automatically if the device is resized.

The recording of graphics operations is relatively expensive in terms of memory so the command dev.control("inhibit") can be useful if memory usage is an issue.

See Also

dev.cur and other functions


## Not run: 
plot(rnorm(10), main="Plot 1")
mtext("Copy 1", 3)
dev.print(width=6, height=6, horizontal=FALSE) # prints it
## End(Not run)

[Package grDevices version 2.5.0 Index]