[R] pdf() Export Problem: Circles Interpreted as Fonts from ggplot2 Graphics

David Winsemius dwinsemius at comcast.net
Fri Dec 31 01:07:30 CET 2010

You could try using the Symbol font's solid circle as pch ,  octmode  
267,  if I am reading the output from the TestChars function on the  
points help page correctly.

BTW, I opened your document in GIMP and it shows "q"'s as well.


On Dec 30, 2010, at 5:59 PM, Adam Carr wrote:

> Good Evening:
> I am putting together a large report with plots created in R, V  
> 2.12.0. Most of
> the plots are created using ggplot2 V0.8.9. I use R's pdf() command  
> to export
> the plot to a pdf file. I am exporting the plots and attempting to  
> edit the
> title text in Inkscape primarily because ggplot2 does not support  
> superscript or
> subscript formatting in the title text. For the report I am working  
> on these
> formats are essential.
> I am running the R version mentioned above and Inkscape 0.48 on a  
> Windows XP
> machine with the following system details:
> OS Name Microsoft Windows XP Professional
> Version 5.1.2600 Service Pack 3 Build 2600
> System Type X86-based PC
> Processor x86 Family 6 Model 15 Stepping 11 GenuineIntel ~1995 Mhz
> BIOS Version/Date LENOVO 7LETB7WW (2.17 ), 4/25/2008
> Total Physical Memory 4,096.00 MB
> Available Physical Memory 1.62 GB
> Total Virtual Memory 2.00 GB
> Available Virtual Memory 1.96 GB
> Page File Space 8.69 GB
> I do not think this is a ggplot2-specific problem.
> I use a simple version of the pdf() command to export the file that  
> includes the
> file name and path only. The PDF looks fine actually, it is the  
> restriction on
> text editing caused by Adobe's intepretation of the graphic that is  
> the problem.
> I have attached two files to this email:
> 1. An R-exported pdf file exactly as it looks as opened in Adobe  
> Reader V9. This
> file is named exportforinkscapeforum.pdf.
> 2. An example of the way the plot appears after I import it into  
> Inkscape. This
> file is named Example of How Imported File Appears in Inkscape.pdf.
> The problem I have is that when I import the pdf into Inkscape the  
> solid, filled
> circles on the plot are converted to the lower case letter q. I read  
> about
> similar problems on R-help.org and other R-related sites, but the  
> descriptions I
> found seemed to indicate that the lower case q was visible in the  
> pdf file when
> opened with Adobe or other viewers. This does not seem to be my  
> problem.
> I posted this problem to the Inkscape forum and received a reply  
> suggesting that
> Adobe is interpreting the solid, filled circles not as solid, filled  
> circles but
> as font objects. The user who replied suggested that I look for the  
> Zpf Dingbat
> font embedded in the PDF and it is in fact there. This is the font  
> Adobe is
> applying to my solid, filled circles. Apparently there are known  
> issues with
> Inkscape's ability to import fonts via PDF and the problem is  
> documented on
> their bug list.
> The Inkscape user asked if there was any way that R could be coerced  
> to use
> actual circles or paths for the points. I am not aware of a way to  
> do this so
> any input from anyone here would be greatly appreciated.
> To briefly return to my main problem: if there is another way to  
> edit the main
> title text to include a superscripted character (in my particular  
> case it is
> Unicode character 00AE, the registered trademark sign) I would  
> appreciate the
> insight.
> Any help on this issue would be appreciated.
> Adam
> <Example of How Imported PDF Looks in  
> Inkscape 
> .pdf 
> > 
> < 
> exportforinkscapeforum 
> .pdf>______________________________________________
> R-help at r-project.org 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.

David Winsemius, MD
West Hartford, CT

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