That still redraws, and it flickers visibly on my (latest model with
nVidia graphics) MacBook Air (on both quartz() and X11()).
R graphics devices use an 'ink and paper' model, so it is impossible
to remove (or move) elements. All you can do is repaint background on
sections of the plot and redraw there. It can be done much more
smoothly than that example in base graphics, at least.
We expect to have a double-buffered X11 device soon (it is delayed by
event-loop issues) and that will probably not flicker so visibly (the
windows() device is double-buffered and does not).
On Fri, 20 Feb 2009, Ken Knoblauch wrote:
<iuhz7j202 <at> sneakemail.com> writes:
Are there any devices/packages available for R on Mac OS
that let you move a single element in a plot without
redrawing the whole plot?
....
The grid package lets you shift individual elements, but
I've tried it in X11(), quartz() and Cairo()
devices and in every case it still redraws whole plot.
quartz() seems to be the fastest, but also the most flickery.
As a quick example of what I'm talking about, here is some code:
library(ggplot2)
qplot(1:5,1:5)
for(i in 1:30){
grid.gedit(gPath("geom_point"),x=unit((1:5/5)/i,"npc"))
}
This should shift the five points in the plot smoothly
to the left, but the redrawing of the whole background
Now about something like
library(ggplot2)
qplot(1:5,1:5)
for(i in 1:30){
grid.gedit(gPath("geom_point"),x=unit((1:5/5)/i,"npc"))
Sys.sleep(0.1)
}
Many thanks,
Peter
--
Ken Knoblauch
Inserm U846
Stem-cell and Brain Research Institute
Department of Integrative Neurosciences
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/members/kenneth-knoblauch.html
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--
Brian D. Ripley, [email protected]
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
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