| dev2 {grDevices} | R Documentation |
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.next())
dev.print(device = postscript, ...)
dev.copy2eps(...)
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. This will not work unless
options("printcmd") is set suitably and you have a
PostScript printer: see postscript for how to set this
up. Windows users may prefer to use dev.print(win.print).
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.
dev.cur and other dev.xxx functions
## Not run:
x11()
plot(rnorm(10), main="Plot 1")
dev.copy(device=x11)
mtext("Copy 1", 3)
dev.print(width=6, height=6, horizontal=FALSE) # prints it
dev.off(dev.prev())
dev.off()
## End(Not run)