\n in the axis title causes problem

[vzemlys]

I've encountered the following weird problem. If there is an "\n" in the begining of the axis title, axis titles disappear altogether from the ggplot.

The code to reproduce:

library(ggplot2)
library(showtext)
showtext.auto()
png("test.png")
ggplot(data=data.frame(x=rnorm(10),y=rnorm(10)),aes(x=x,y=y))+geom_point()+labs(x="\nLong line\nCanother\n(line")
dev.off()

The result is that, the x axis title together with y axis title disappear completely. If \n is removed at the begining, then everything displays perfectly. Also if we do not use showtext the bug does not appear. This bug is fully reproducible on my remote Linux server. However I can only reproduce it on this particular machine. Everything is fine on my local Macbook Pro. Here is the sessionInfo() of that particular Linux server:

R version 3.3.1 (2016-06-21)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Debian GNU/Linux 8 (jessie)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] showtext_0.4-4     sysfonts_0.5       ggplot2_2.1.0.9001

loaded via a namespace (and not attached):
 [1] labeling_0.3     colorspace_1.2-6 scales_0.4.0     assertthat_0.1  
 [5] lazyeval_0.2.0   plyr_1.8.4       tools_3.3.1      gtable_0.2.0    
 [9] showtextdb_1.0   tibble_1.2       Rcpp_0.12.7      grid_3.3.1      
[13] munsell_0.4.3   

and the devtools::session_info()

Session info -------------------------------------------------------------------
 setting  value                       
 version  R version 3.3.1 (2016-06-21)
 system   x86_64, linux-gnu           
 ui       X11                         
 language (EN)                        
 collate  en_US.UTF-8                 
 tz       <NA>                        
 date     2016-10-05                  

Packages -----------------------------------------------------------------------
 package    * version    date       source                         
 assertthat   0.1        2013-12-06 CRAN (R 3.3.0)                 
 colorspace   1.2-6      2015-03-11 CRAN (R 3.3.0)                 
 devtools     1.12.0     2016-06-24 CRAN (R 3.3.0)                 
 digest       0.6.10     2016-08-02 cran (@0.6.10)                 
 ggplot2    * 2.1.0.9001 2016-10-04 Github (hadley/ggplot2@5a18687)
 gtable       0.2.0      2016-02-26 CRAN (R 3.3.0)                 
 labeling     0.3        2014-08-23 CRAN (R 3.3.0)                 
 lazyeval     0.2.0      2016-06-12 CRAN (R 3.3.0)                 
 memoise      1.0.0      2016-01-29 CRAN (R 3.3.0)                 
 munsell      0.4.3      2016-02-13 CRAN (R 3.3.0)                 
 plyr         1.8.4      2016-06-08 CRAN (R 3.3.0)                 
 Rcpp         0.12.7     2016-09-05 cran (@0.12.7)                 
 scales       0.4.0      2016-02-26 CRAN (R 3.3.0)                 
 showtext   * 0.4-4      2015-10-30 CRAN (R 3.3.1)                 
 showtextdb   1.0        2015-03-10 CRAN (R 3.3.1)                 
 sysfonts   * 0.5        2015-04-27 CRAN (R 3.3.1)                 
 tibble       1.2        2016-08-26 cran (@1.2)                    
 withr        1.0.2      2016-06-20 CRAN (R 3.3.0) 

I was not able to reproduce this on my Mac OS X 10.11.16 running R 3.3.0 with the same versions of ggplot2 and showtext. Here is the relevant devtools::session_info():

Session info -------------------------------------------------------------------
 setting  value                       
 version  R version 3.3.0 (2016-05-03)
 system   x86_64, darwin13.4.0        
 ui       X11                         
 language (EN)                        
 collate  C                           
 tz       Europe/Vilnius              
 date     2016-10-05                  

Packages -----------------------------------------------------------------------
 package    * version    date       source                         
 Rcpp         0.12.7     2016-09-05 cran (@0.12.7)                 
 assertthat   0.1        2013-12-06 CRAN (R 3.3.0)                 
 colorspace   1.2-6      2015-03-11 CRAN (R 3.3.0)                 
 devtools     1.12.0     2016-06-24 CRAN (R 3.3.0)                 
 digest       0.6.10     2016-08-02 cran (@0.6.10)                 
 ggplot2    * 2.1.0.9001 2016-10-05 Github (hadley/ggplot2@5a18687)
 gtable       0.2.0      2016-02-26 CRAN (R 3.3.0)                 
 labeling     0.3        2014-08-23 CRAN (R 3.3.0)                 
 lazyeval     0.2.0      2016-06-12 CRAN (R 3.3.0)                 
 memoise      1.0.0      2016-01-29 CRAN (R 3.3.0)                 
 munsell      0.4.3      2016-02-13 CRAN (R 3.3.0)                 
 plyr         1.8.4      2016-06-08 CRAN (R 3.3.0)                 
 scales       0.4.0      2016-02-26 CRAN (R 3.3.0)                 
 showtext   * 0.4-4      2015-10-30 CRAN (R 3.3.0)                 
 showtextdb   1.0        2015-03-10 CRAN (R 3.3.0)                 
 sysfonts   * 0.5        2015-04-27 CRAN (R 3.3.0)                 
 tibble       1.2        2016-08-26 cran (@1.2)                    
 withr        1.0.2      2016-06-20 CRAN (R 3.3.0)                 

[yixuan]

Hi @vzemlys , thanks for the report. However I could not reproduce this issue on my machine either. I suspect that this is due to the system libraries to build showtext, such as freetype and libpng. Could you also report the version of those libraries also?

[vzemlys]

Here it is:

dpkg -l | grep freetype    
ii  libfreetype6:amd64                 2.5.2-3+deb8u1              amd64        FreeType 2 font engine, shared library files
ii  libfreetype6-dev                   2.5.2-3+deb8u1              amd64        FreeType 2 font engine, development files

dpkg -l | grep libpng
ii  libpng12-0:amd64                   1.2.50-2+deb8u2             amd64        PNG library - runtime
ii  libpng12-dev:amd64                 1.2.50-2+deb8u2             amd64        PNG library - development

[yixuan]

Now I can reproduce this problem in a Linux server. Will investigate later. Thanks.

[yixuan]

Hi @vzemlys, this problem has been fixed on github. I'll submit a new version to CRAN later.

[yixuan]

I just realized that I should close this issue, unless you have any other problems.