[RQt-devel] par(xpd=NA) and the layout approach in qtpaint

[Yihui Xie]

I'm in favor of cache=TRUE whereas clip=FALSE; at least we (ISU
graphics group) use caching very often to develop interactive
graphics, but clip=TRUE, on the other hand, often has annoying and
unexpected consequences, e.g. the elements you draw do not show up at
the expected locations.

Regards,
Yihui
--
Yihui Xie <xieyihui at gmail.com>
Phone: 515-294-2465 Web: http://yihui.name
Department of Statistics, Iowa State University
2215 Snedecor Hall, Ames, IA



On Wed, Sep 1, 2010 at 10:55 AM, Hadley Wickham <hadley at rice.edu> wrote:
>> I would suggest turning off caching, i.e., pass cache=FALSE to qlayer, at
>> least for the two axes. The issue, I think, is that Qt will only allocate a
>> buffer large enough for the layer. You're then drawing outside of the cache,
>> and it never makes it to the screen. I might make clip and cache both
>> default to FALSE.  Caching usually only makes sense when there is a dynamic
>> overlay on the layer. This is usually not the case for axes.
>
> This seems counterintuitive - you'd normally expect that cache to be
> most helpful when you're not updating the layer very often?
>
> Hadley
>
> --
> Assistant Professor / Dobelman Family Junior Chair
> Department of Statistics / Rice University
> http://had.co.nz/
>