[R-SIG-Mac] quartz device extremely slow (2.7.0)

[Prof Brian Ripley]

Some versions of Windows GDI have a superficially identical problem -- 
stroking a path is quadratic in the number of segments.  The solution we 
used (in gdrawpolyline, in src/extra/graphapp/gdraw.c) was to split the 
drawing into pieces of length 1000, and that could be used here.  It would 
be a simple modification to RQuartz_Polyline and RQuartz_Polygon, so 
please try it and let us know how you get on.

It would also have been helpful to (C-level) profile the call and find out 
where the time is being spent -- I expect it not to be in R at all but in 
Quartz.

On Sun, 27 Apr 2008, Tomas Mikoviny wrote:

> I found where is the problem, however have no solution for it right now.
> To demonstrate (I have chosen 6000 to match my datasets size):
>
> x=seq(1:6000)
> y=rnorm(6000)
> plot(x,y)
>
> Absolutely no problem until now, everything is responsive, no lags.
>
> Problem appears when I insert parameter 'type':
>
> slowdown and unacceptable lag for "l", "o", "s"
> plot(x,y, type="l")
> plot(x,y, type="o")
> ...
>
> however no problem at all  (instantly plotted) for "p", "b", "c", "h"
> plot(x,y, type="p")
> plot(x,y, type="b")
> ...
>
> Does anyone know possible reason for this behaviour. Once again, I use
> clear install of R version 2.7.0 (2008-04-22). When I try the same
> stuff with latest 2.6.2 version everything runs smoothly without any
> problems.
>
> tomas
>
>
> On 27 Apr 2008, at 10:49, Charles Hebert wrote:
>
>> Hi all,
>>
>> I've the same problem + the resizing of the window is really really
>> slow... for all datasets. I'm running leopard 10.5.2 and the latest
>> macOS R dmg.
>>
>> For all datasets. But when i use quartz() then plot, it seems ok
>> (slow again but... usable). So right now, i use quartz(file,
>> type="pdf")...
>>
>> Best regards,
>>
>> Charles
>
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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