[R-SIG-Mac] quartz aspect wrong

[Simon Urbanek]

Hank,

R 2.7.0 (unlike previous versions) allows non-square pixels and  
determines the pixel aspect ratio from the physical dimensions of the  
screen (unless specified directly). In your case I suspect that the  
reported physical dimensions are that of the non-rotated screen  
whereas the pixel dimensions are rotated - that will result in a bogus  
dpi.

Try setting dpi=100 (or the exact x and y resolutions of your screen  
if you know it). That should fix the problem (you can use  
quartz.options to make the change permanent).

Unfortunately CGDisplayRotation is only available in Mac OS X 10.5 so  
we cannot require it to determine the rotation. I have added some  
heuristics to match the orientation of the physical and pixel  
dimensions. It may throw off some unusual geometry screens but it  
should work in your case (sort of the most usual unusual case ;)), so  
please try tonight's R-devel or R-patched.

Thanks,
Simon


On Jun 8, 2008, at 11:51 AM, Hank Stevens wrote:

> Hi Folks,
> I am using R version 2.7.0 (2008-04-22). The problem I describe is  
> new since 2.6.2.
>
> I find that
>
> x11(width=7, height=7)
>
> gives me a square device but
>
> quartz(,7,7)
> or
> plot(1:10)
>
> results in a quartz device that does not appear square on my machine  
> - the aspect is distorted compared to the X11 device. It looks  
> stretched too tall and a tiny bit too narrow.
>
> I am not sure if any of this is relevant:
>
> I am on a Mac (10.5.3) and have two Dell monitors on their sides so  
> I have two tall side by side screens. The resolutions are both 1024  
> x 1280, and they are rotated 90 and 270 deg.
>
> My .RProfile includes
>
> grDevices::ps.options(horizontal = FALSE)
>
> .First <- function() {cat(paste(date()),"\nRecepcion al R asombroso,
> dude!\n\n")
> #library(CarbonEL)
> # Sys.setenv("DISPLAY"=":0")
> options(device="quartz")
>                    }
>
> Thanks for any thoughts.
> Hank
>
> Dr. Hank Stevens, Associate Professor
> 338 Pearson Hall
> Botany Department
> Miami University
> Oxford, OH 45056
>
> Office: (513) 529-4206
> Lab: (513) 529-4262
> FAX: (513) 529-4243
> http://www.cas.muohio.edu/~stevenmh/
> http://www.cas.muohio.edu/ecology
> http://www.muohio.edu/botany/
>
> "If the stars should appear one night in a thousand years, how would  
> men
> believe and adore." -Ralph Waldo Emerson, writer and philosopher  
> (1803-1882)
>
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