[R-SIG-Mac] strange interaction of quartz() with videoprojector

[Kenneth Knoblauch]

A setting of dpi = 1.5 * 72 generates about the right size
graphics and alleviates the light lines problem, which must
have been from the antialiasing, as you proposed.

This seems to be related to the automatic selection of resolution
in System Preferences for Displays.  The values chosen automatically
which generated the small quartz windows are set at
1280 x 1024.  At one point, restarting the machine while
connected to the videoprojector, it started up with a lower
resolution and the quartz window worked fine.  I wasn't
able to reproduce this though by manually reducing the
resolution in the preferences.  I have to experiment
a bit more to see how to get it to start up automatically
in the lower resolution, which would seem to obviate the problem
for the short term.

Thank you for your suggestions.

Ken


Quoting Prof Brian Ripley <ripley at stats.ox.ac.uk>:

> You can set the quartz() argument 'dpi'.  I'm not sure why this is
> being detected wrongly, but it looks as if it is.
>
> On Mon, 5 May 2008, Kenneth Knoblauch wrote:
>
>> Hi,
>>
>> The new graphics window defaults in R 2.7.0 are great but I've
>> noticed a strange phenomenon when I'm using R with my MacBook Pro
>> connected to a videoprojector.  Under these conditions,
>> the quartz window that is opened is tiny,
>> about 1/5 the default size and the line colors are a light
>> grey (or a light color, at least.  Not 100% sure that it is grey).
>
> This could be the effect of antialiasing on narrow lines.
>
>> As soon as I detach the videoprojector and reset the
>> display size, everything returns to normal.
>>
>> The minimal example would be to hook up your portable to
>> a videoprojector, start R and run
>>
>> quartz()
>>
>> Does anyone else see this?
>>
>> I can get the normal default with
>>
>> quartz(width = 30, height = 30)
>>
>> but the text and points are very small.  I can get around this
>> with cex and col arguments but this is not optimal.  Not great
>> for teaching.
>>
>> Thank you for any suggestions.  SessionInfo below.
>>
>> Ken
>>
>>
>>
>> R version 2.7.0 Patched (2008-04-30 r45572)
>> i386-apple-darwin8.10.1
>>
>> locale:
>> en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>
>>
>> -- 
>> Ken Knoblauch
>> Inserm U846
>> Institut Cellule Souche et Cerveau
>> Département Neurosciences Intégratives
>> 18 avenue du Doyen Lépine
>> 69500 Bron
>> France
>> tel: +33 (0)4 72 91 34 77
>> fax: +33 (0)4 72 91 34 61
>> portable: +33 (0)6 84 10 64 10
>> http://www.sbri.fr
>>
>> _______________________________________________
>> R-SIG-Mac mailing list
>> R-SIG-Mac at stat.math.ethz.ch
>> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
>
> -- 
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595



-- 
Ken Knoblauch
Inserm U846
Institut Cellule Souche et Cerveau
Département Neurosciences Intégratives
18 avenue du Doyen Lépine
69500 Bron
France
tel: +33 (0)4 72 91 34 77
fax: +33 (0)4 72 91 34 61
portable: +33 (0)6 84 10 64 10
http://www.sbri.fr