[R] Double-buffering problem, this time with an example.

[Bert Gunter]

For the record, I confirm Dan's description on Windows:

> sessionInfo()
R version 2.15.0 (2012-03-30)
Platform: x86_64-pc-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] tools_2.15.0

-- Bert

On Sat, Jun 2, 2012 at 1:02 PM, Daniel Carr <dcarr at gmu.edu> wrote:
> Most of my animations that used to work
> on windows() version 2.11.1 and earlier now flash
> as if the double buffering is turned off or buffer swapping
> is triggered by other events than in the past.
>
> The simplified example below using symbols
> should illustrate the problem in a windows environment.
>
> windows()
>
> radius <- 8
> n <- 6
> ang <- seq(0,2*pi,length=n+1)[-(n+1)]
> ca <- cos(ang)
> sa <- sin(ang)
> size <- c(.1, .3, .5, .7, .9, 1)
>
> colors <-  rainbow(length(size))
>
> for (i in 1:1000){
>  radius <- radius*.998
>  bnd <- (radius+1)* c(-1, 1)
>  cenX <- radius*ca
>  cenY <- radius*sa
>  symbols(cenX, cenY, circles = size,
>          xlim=bnd, ylim=bnd, bg=colors)
> }
>
> I have not isolated the version  when the flashing
> started but it somewhere between
> 2.11.1 and 2.14.1.
>
> I did some searching on double-buffering
> problems in R but didn't find indications
> of this particular problem.
>
> Slowing the animation down did not help.
>
> Dan
>
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> and provide commented, minimal, self-contained, reproducible code.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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