Re: [R] Plotting directly to memory?
Perhaps the ragg package? That has an `agg_capture` device "that lets you access the device buffer directly from your R session." https://github.com/r-lib/ragg HTH, Jan On 28-05-2023 13:46, Duncan Murdoch wrote: Is there a way to open a graphics device that plots entirely to an array or raster in memory? I'd prefer it to use base graphics, but grid would be fine if it makes a difference. For an explicit example, I'd like to do the equivalent of this: filename <- tempfile(fileext = ".png") png(filename) plot(1:10, 1:10) dev.off() library(png) img <- readPNG(filename) unlink(filename) which puts the desired plot into the array `img`, but I'd like to do it without needing the `png` package or the temporary file. A possibly slightly simpler request would be to do this only for plotting text, i.e. I'd like to rasterize some text into an array. Duncan Murdoch __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Plotting directly to memory?
On Sun, May 28, 2023 at 1:46 PM Duncan Murdoch wrote: > > Is there a way to open a graphics device that plots entirely to an array > or raster in memory? I'd prefer it to use base graphics, but grid would > be fine if it makes a difference. > > For an explicit example, I'd like to do the equivalent of this: > >filename <- tempfile(fileext = ".png") >png(filename) >plot(1:10, 1:10) >dev.off() > >library(png) >img <- readPNG(filename) > >unlink(filename) > The magick package has this capability too: library(magick) img <- magick::image_device() plot(1:10, 1:10) dev.off() image_data(img) __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Plotting directly to memory?
Is there a way to open a graphics device that plots entirely to an array or raster in memory? I'd prefer it to use base graphics, but grid would be fine if it makes a difference. For an explicit example, I'd like to do the equivalent of this: filename <- tempfile(fileext = ".png") png(filename) plot(1:10, 1:10) dev.off() library(png) img <- readPNG(filename) unlink(filename) which puts the desired plot into the array `img`, but I'd like to do it without needing the `png` package or the temporary file. A possibly slightly simpler request would be to do this only for plotting text, i.e. I'd like to rasterize some text into an array. Duncan Murdoch __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.