The posting guide says For questions about unexpected behavior or a possible bug, you should, at a minimum, copy and paste the output from sessionInfo() into your message.
If you are using an old version of R and think it does not work properly, upgrade to the latest version and try that, before posting. [There is a known bug in 2.4.0 related to semi-transparency, fixed in 2.4.0. I would not have attempted to answer a question about 2.1.1, and we do rely on people seeking free technical assistance doing their bit.] On Fri, 27 Apr 2007, Matthew Neilson wrote: > Thanks for your fast response. > > I'm using R version 2.1.1 on OS X 10.3.9 to create the pdfs. I have tried > viewing the pdf output in both Acrobat 6 and 7 (both display a white border > around each polygon) as well as > Preview (displays fine). I have emailed the pdf file to some correspondents > running Windows, and they also see white borders when viewing with Acrobat > (version unspecified). > > I have tried using R version 2.4.0 on a G5 machine (which I can access > remotely) running OS X 10.4.8, but the resulting pdf renders incorrectly > (i.e. with a white border around each > polygon) in both Acrobat *and* Preview. So it would appear that the > combination of R 2.1.1 and OS X 10.3.9 gives slightly better results - > although plots still appear incorrect when > printed or viewed in Acrobat. > > Unfortunately, I don't have access to a Windows machine to test this out. > Even if I did, many of my scripts include various Unix system calls so I > don't think that would be a viable > solution. Could this be a bug in the OS X pdf driver? The R pdf() device is the same on all platforms. > Many thanks, > > > -Matt > > > > On 27 Apr 2007, at 06:42, Prof Brian Ripley wrote: > >> What version of R, what OS, what version of Acrobat? >> >> I don't see this in 2.5.0 on Windows (using Acrobat 7: Acrobat does not >> exist on Linux, AFAIK). And reading the PDF produced shows no sign of an >> extra object for the border. >> >> On Fri, 27 Apr 2007, Matthew Neilson wrote: >> >>> Hey all, >>> >>> I'm trying to create a plot of two semi-transparent regions. The reason >>> they need to be partially transparent is so that I can see if there's any >>> overlap. Here's some example code: >>> >>> # BEGIN >>> >>> pdf(file="test.pdf",version="1.4") >>> plot(0,0,type="l",ylim=range(-3,3),xlim=range(-1,5)) >>> polygon(c(0,1,2,3,4,3,2,1,0), c(0,1,2,1,0,-1,-2,-1,0), col=rgb(1,0,0,0.5), >>> border=NA) >>> polygon(c(1,2,3,4,5,4,3,2,1), c(0,1,2,1,0,-1,-2,-1,0), col=rgb(0,0,1,0.5), >>> border=NA) >>> dev.off() >>> >>> # END >>> >>> The problem with this is that, despite setting "border = NA", I get a >>> big white border surrounding each polygon!! Funnily enough, setting the >>> alpha channel equal to 1 (as opposed to 0.5) *doesn't* give the border, >>> but an alpha channel of 1 produces an opaque polygon! :S >>> >>> I have read the FAQ, and (unfortunately) turning off line-art smoothing >>> does not give the desired effect. Furthermore, my pdfs print with a >>> white border surrounding each transparent polygon. >>> >>> Now, here comes the really bizarre part. Whilst Adobe Acrobat displays >>> the unwanted white border, Apple Preview respects the "border=NA" >>> argument and shows the two diamonds as they are intended. However, >>> opening up the pdf in Illustrator CS reveals that there is in fact a >>> transparent (according to Illustrator) border *on top* of each diamond. >>> Deleting these two borders (one for each polygon) and re-saving the pdf >>> appears to correct the issue. So the obvious question is: how did the >>> surrounding borders get there in the first place? A bug in the polygon >>> function, perhaps? >>> >>> Does anyone have any ideas for preventing these unwanted borders around >>> semi-transparent polygons (without having to resort to Illustrator)? Has >>> anyone else even come across this problem? >>> >>> Many thanks, >>> >>> >>> -Matt >>> >> >> -- >> 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 > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- 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 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
