Ken,
it turned out that the speed optimization fix was the reason for this
new behavior (and strangely enough only on Leopard). I have replaced
it with another variant that should keep the dashes (mostly) intact in
the current R-patched and R-devel (binaries will be available
tonight). For contiguous lines with hundreds of points there may be
gaps due to re-starting dashes at break points (for speed up), but we
can't do much about it now simply because the drawing slows down to a
crawl otherwise.
Cheers,
Simon
On May 29, 2008, at 9:17 AM, Kenneth Knoblauch wrote:
Hi,
There was some discussion about slowdowns in the new quartz
device a few weeks ago that had to do with line drawing but
I don't think that the following has been mentioned.
I've noticed a "new" behavior in the quartz device that can be seen
by running
xx <- seq(1:100)
plot(xx, xx^2, type = "l", lty = 2)
On my display, the dash spacing disappears for xx < 40
for the default window size.
In addition, the dashes are obliterated by increasing the
line width,
lines(xx, 0.5 * xx^2, lty = 2, lwd = 2)
unless I enlarge the window. The same occurs for lty = 3.
The dash spacing seems to depend on the slope of the contour.
plot(rep(1, 100), lty = 2, type = "l", ylim = c(0, 100))
lines(xx, lty = 2)
lines(2 * xx, lty = 2)
This did not occur in an earlier version of R that I tried (R 2.2.0)
and does not occur in other graphic devices that I have tried
(x11 and pdf, so far).
sessionInfo()
R version 2.7.0 Patched (2008-05-28 r45808)
i386-apple-darwin8.10.1
locale:
en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Does anyone else see this? Apologies in advance if this is normal
behavior. Thank you.
best,
Ken
--
Ken Knoblauch
Inserm U846
Institut Cellule Souche et Cerveau
Département Neurosciences Intégratives
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
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