[R-SIG-Mac] Odd quartz behavior on 24" iMac at 10.7.5

[Ray Spence]

Hi Simon,

Thank you very much for your response. I've installed the inline library
and run the function as you wrote. The results are interesting. Following
this procedure on a 24" iMac running OS X 10.7.4 I get this:

 > f()
518.809mm x 320.842mm
[1] 1.617021
 >

which is pretty close to what you predicted. However, doing the same on 
another
24" iMac running OS X 10.7.5 I get this:

 > f()
0mm x 0mm
[1] NaN
 >

which clearly shows a problem. I know that we can set the quartz dpi 
variable
by hand per session or in users' .Rprofile file which will compensate 
for this
problem. But I'd like to find a better solution that doesn't require 
editing any
user file. I suppose this a bug but am not sure if it would belong to R or
to Apple?

Thanks again
Ray

On 10/15/12 6:32 PM, Simon Urbanek wrote:
> Ray,
>
> On Oct 15, 2012, at 8:57 PM, Ray Spence wrote:
>
>> All,
>>
>> There seems to be something wrong between OS X 10.7.5 and how
>> quartz reads Apple graphics resolution on 24" iMac (early 2008,
>> iMac8,1) on R 2.15.1 GUI1.52. On this hardware/OS/R version the
>> default R plot is a rectangle.
> Can you attach a screenshot? R is simply reading the geometry reported by the OS to adjust the aspect ratio accordingly.
>
> Can you run this in R:
>
> install.packages("inline") # if you don't have inline installed yet
> library(inline)
> f=cfunction(,'CGDirectDisplayID md = CGMainDisplayID(); CGSize ds = CGDisplayScreenSize(md); Rprintf("%gmm x %gmm\\n", ds.width, ds.height); return ScalarReal(ds.width / ds.height);','#include <ApplicationServices/ApplicationServices.h>')
> f()
>
> You should see this on a 24" iMac8,1:
>
>> f()
> 520mm x 320mm
> [1] 1.625
>
> Those are the proper dimensions of the built-in screen.
>
> If that's not what you get, you should be able work around this by setting dpi manually to 94 (it will be slightly off since the native dpi is asymmetric 93.785 x 95.25 but 94 should be close enough to not notice) - either in quartz.options() or quartz().
>
> Cheers,
> Simon
>
>
>
>> On same hardware/R version running
>> OS X 10.7.4 the default R plot is square as expected. (I don't see
>> this behavior on 20" iMac once upgraded to 10.7.5.)
>>
>> On this problematic iMac, if I run quartz.options() without changing
>> anything I see:
>>
>>> quartz.options()
>> $title
>>
>> [1] "Quartz %d"
>>
>> $width
>>
>> [1] 7
>>
>> $height
>>
>> [1] 7
>>
>> $pointsize
>>
>> [1] 12
>>
>> $family
>>
>> [1] "Helvetica"
>>
>> $fontsmooth
>>
>> [1] TRUE
>>
>> $antialias
>>
>> [1] TRUE
>>
>> $type
>>
>> [1] "native"
>>
>> $bg
>>
>> [1] "transparent"
>>
>> $canvas
>>
>> [1] "white"
>>
>> $dpi
>>
>> [1] NA
>>
>> But any plot, eg.
>>> plot (rnorm(10),rnorm(10))
>> returns an image that is most definitely not a square.
>>
>> Can anyone help me investigate this? For instance where/how
>> does R create the plot graphic? Are there specific OS X file(s) that R
>> reads to generate the plots?
>>
>> My assumption is that this is an Apple Inc. generated problem
>> but figured that the R community might be a bit more responsive..
>>
>> Thanks,
>> Ray
>>
>> -- 
>> *******************
>> Raymond Spence
>> U.C. Berkeley
>> Dept. of Statistics
>> SCF Sysadmin
>> 497 Evans Hall
>> U.C. Berkeley
>> 510.642.5497
>>
>> _______________________________________________
>> R-SIG-Mac mailing list
>> R-SIG-Mac at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
>>
>>


-- 
*******************
Raymond Spence
U.C. Berkeley
Dept. of Statistics
SCF Sysadmin
497 Evans Hall
U.C. Berkeley
510.642.5497