[R] Graphic device & graphics primitives

[Prof Brian Ripley]

On Thu, 29 Jan 2009, Sigbert Klinke wrote:

> Hi,
>
> I know that some graphics devices in R store graphics primitives such that a 
> redraw is possible (e.g. when resizing the window). Is it possible to get the 
> current number of stored graphic primitives?

That's not what happens: the graphics engine stores a display list for 
the current device (if enabled), this being a set of graphics calls. 
Devices repaint from either backing store or asking the engine to 
replay the display list.

See ?dev.control. There is no public API to the display list, but of 
course you can interrogate it by C code, with the usual risks.

> Thanks in advance
>
> Sigbert Klinke
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

This looks very like a programming question for R-devel: it *is* about 
R's internals.


-- 
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)
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