[R] automatically calling dev.off()

[Jeff Newmiller]

If you are implementing your own interactive graphics device by creating files, then I would expect you to want to leave all files closed between graphics operations so your widget can interactively update as the user makes graphics calls. However, I have not done this, so could only suggest that you look at some example client code (RStudio? RGui?) and perhaps search r-devel.
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Sent from my phone. Please excuse my brevity.

On September 1, 2015 6:54:33 AM PDT, axionator <axionator at gmail.com> wrote:
>I did it on the console only for testing. I have a program that uses
>Rserve
>and would like to have it therefore. (the program basically provides a
>terminal where you can type in R commands. Since plotting is only
>possible
>via files (when using Rserve) that are then displayed in a widget, I
>like
>to avoid the overhead of writing png() ... dev.off()  for each plot.)
>
>On Tue, Sep 1, 2015 at 3:42 PM, Jeff Newmiller
><jdnewmil at dcn.davis.ca.us>
>wrote:
>
>> Don't use options to do this in batch mode. Open and close the file
>as you
>> make the plot.
>>
>---------------------------------------------------------------------------
>> Jeff Newmiller                        The     .....       .....  Go
>Live...
>> DCN:<jdnewmil at dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live
>> Go...
>>                                       Live:   OO#.. Dead: OO#.. 
>Playing
>> Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
>> /Software/Embedded Controllers)               .OO#.       .OO#. 
>rocks...1k
>>
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>> Sent from my phone. Please excuse my brevity.
>>
>> On September 1, 2015 4:34:41 AM PDT, axionator <axionator at gmail.com>
>> wrote:
>> >Hi,
>> >is there a way to automatically call dev.off()?
>> >I use options(device="myfunc") to automatically open a device to
>print
>> >to.
>> >Afterwards, I would like to close it (so that the file is actually
>> >written).
>> >I tried to do it via addTaskCallback, but unfortunately, I have to
>use
>> >Rserve and (for any reason), the callback does not work (in the
>default
>> >R
>> >console on win7 it works, however).
>> >
>> >So, the following runs in the R console (but not via Rserve):
>> >
>> >mypng <- function(filename = "test.png", ...)
>> >{
>> >    times <- function(total = 2, str = "Task") {
>> >        ctr <- 0
>> >        function(expr, value, ok, visible) {
>> >            ctr <<- ctr + 1
>> >            keep.me <- (ctr < total)
>> >            if (ctr == total) {
>> >                cat("ENDPRINT")
>> >                dev.off()
>> >            }
>> >            keep.me
>> >        }
>> >    }
>> >    png(filename, ...)
>> >    n <- addTaskCallback(times(1))
>> >}
>> >options(device="mypng")
>> >plot(rnorm(333))
>> >
>> >Any hints?
>> >
>> >       [[alternative HTML version deleted]]
>> >
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>>
>>