On Tue, Jan 24, 2023 at 4:50 AM Martin Maechler <maech...@stat.math.ethz.ch> wrote: > > >>>>> Ziyun Tang > >>>>> on Sat, 21 Jan 2023 15:14:15 -0500 writes: > > > Hello, I have been experiencing some issues regarding scrolling with > > the mouse or trackpad in R graphics windows (from the base graphics > > package), which sometimes results in flickering, and wanted to see if > > anyone else had the same issues, or any advice. This happens for R > > version 4.2.2 on Windows 10 x64, and occurs when using Rgui and at the > > command line (whenever graphics windows are invoked). Note that some > > of the example code below can cause flickering and can be an issue for > > those with photosensitive epilepsy. > > > Specifically, I have been experiencing three main issues, as follows: > > > 1. When viewing a dataset with View(), the graphics window flickers > > when scrolling downwards too quickly, even with the option > > buffered=TRUE. For example: > >> View(iris) > > If you use [Page Up] and [Page Down] there is no "flickering", > also using the cursor (up/down "arrows"). > Still here, I would not think anything to be "wrong". > If you tell the computer to refresh a screen more quickly than > makes sense I guess you must expect what you see here. > (but yes, more modern GUIs would do 'smooth scrolling' here; I > think that's not available for the graphapp GUI in R for Windows) > > By "scrolling", what exactly do you mean? > Is it that you use your mouse "wheel"? ... I assume "yes" in > the following, because in that case I can partly reproduce what > you describe.
I am seeing that [Page Up], [Page Down] and the cursor still seem to have some flickering when pressed continuously. And yes, by "scrolling" I mean with the mouse wheel, and also with two-finger scrolling via the trackpad, and for the first issue, with the scrollbar. > > 2. When viewing a graph with plot(), and scrolling down, the graphics > > window flickers between the background and the graph itself. For > > example: > >> plot(iris$Sepal.Length, iris$Sepal.Width) > > At first I wrote > I don't understand how you can "scroll down" in this plot > > but now that I've guessed you mean "mouse wheel scrolling" I can > indeed see what you describe. > > > 3. When viewing a matrix of scatterplots with pairs(), and scrolling > > down, the graphics window flickers between the background and the > > individual scatterplots. In some instances, when scrolling down with > > the trackpad, the window flickers continuously, and subsequently > > closing the window crashes R. For example: > >> pairs(iris[1:4]) > > That you bring R to crash just by "scrolling" really seems a bad > thing and points to a bug. > OTOH, I have not been able to replicate a crash. I have retried the example code, and I've found that usually the flickering/updating eventually settles on one panel of the matrix. However, when the panel plots are continuously updating, and if the plot window is closed before it has settled, then R will crash. > I don't know what mouse-wheel-scrolling should do in a graphics window > in R for Windows. > In our terminal server version of Windows, > using Rterm (via ESS = Emacs Speaks Statistics), I can indeed > see that mouse-scrolling in a graphics window has *very funny* > / strange effects when using the default interactive graphics > device ( .Device == "windows" ) : > > Notably, after say pairs(iris) mouse-wheel-scrolling > "kind of" redraws some of the panel plots mostly in full size > (instead of the size they were as panels and as part of the full > "pairs" i.e., scatter plot matrix. > > If instead I use RStudio and their own device "RD<something>" > mouse-wheel-scrolling has no effect, e.g., after pairs(iris). > And "no effect" is clearly better than what we observe with the R > default device "windows" i.e., windows() in the above situation. > > My sessionInfo() is as follows: > > > R version 4.2.2 (2022-10-31 ucrt) > > Platform: x86_64-w64-mingw32/x64 (64-bit) > > Running under: Windows 10 x64 (build 19044) > > > Matrix products: default > > > locale: > > [1] LC_COLLATE=English_United States.utf8 > > [2] LC_CTYPE=English_United States.utf8 > > [3] LC_MONETARY=English_United States.utf8 > > [4] LC_NUMERIC=C > > [5] LC_TIME=English_United States.utf8 > > > attached base packages: > > [1] stats graphics grDevices utils datasets methods base > > > loaded via a namespace (and not attached): > > [1] compiler_4.2.2 tools_4.2.2 > > > Thank you in advance, > > Ziyun I'm unsure how to identify the device used by RStudio, but when viewing RStudio plots in the "Plots" tab I have also seen that mouse-wheel-scrolling and trackpad-scrolling have no effect for pairs(iris). ______________________________________________ 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.
