Hi
On 6/08/2010 5:34 p.m., baptiste auguie wrote:
Hi,
Thanks for pointing this out. I do have the book, unfortunately I left
it abroad this year. I would think that such brief mention in ?gpar
could be useful (because that's where one first looks for gpar()
defaults --- which are not listed).
Righto. I've added a mention in ?gpar
Paul
Best regards,
baptiste
On 6 August 2010 00:54, Paul Murrell<p.murr...@auckland.ac.nz> wrote:
Hi
The help page for "Working with Viewports" (e.g., pushViewport()) has a
brief mention when talking about the ROOT viewport ...
"The viewport tree always has a single root viewport (created by the system)
which corresponds to the entire device (and default graphical parameter
settings)."
... which is a reasonable place for it because this is a feature of the gpar
of the ROOT viewport, not of gpars in general. That mention might be a bit
hard to find, but a very similar statement is also made in the Section on
Viewports in the R Graphics book. That in turn might be hard to find if you
don't have the book, but that chapter is also available online
(http://www.stat.auckland.ac.nz/~paul/RGraphics/chapter5.pdf)
It might be worth adding something more explicit about this sort of gotcha
...
"Some devices have different default graphics parameter settings, so it is
not safe to assume that the ROOT viewport will be identical on different
devices."
... ?
Paul
On 5/08/2010 8:14 a.m., baptiste auguie wrote:
Dear list,
I'm puzzled by the graphical output in the following example,
library(grid)
foo<- function(){
grid.rect(gp=gpar(fill="black"))
print(get.gpar()$fill)
grid.rect(width=0.2,height=0.2)
}
png("test.png", bg = "transparent")
foo()
dev.off()
png("test1.png", bg = "white")
foo()
dev.off()
It seems that the default value of gpar()$fill is set according to the
device background. I couldn't find this documented in ?gpar or in
?png, and it caused a rather puzzling bug in my code (the pdf() output
was OK, whilst the png output (default bg to white) was seemingly
empty because covered by a white rectangle.)
Best regards,
baptiste
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Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
p...@stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/
--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
p...@stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/
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