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

[Prof Brian Ripley]

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
>
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-- 
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