使用等宽系列字体在 R 中渲染图不再显示字符

Question

Update 2020-10-09: the issue does not depend on {ggplot2}, I have provided a more minimal example with some more details

直到几周前，我在渲染和正确查看等宽字符修改后的绘图输出时都没有问题。从几天前开始，它们就不再显示了。
我很难弄清楚如何调试这个问题。有人可以建议一些测试或其他东西来了解来源并解决问题吗？
这是我本地系统的一个代表:

library(showtext)
#> Loading required package: sysfonts
#> Loading required package: showtextdb


plot(1:10)
text(5, 8, "Some text in serif", family = "serif")
text(5, 5, "Some text in mono-spaced", family = "mono")
text(5, 2, "Some text in sans-serif", family = "sans")

showtext_auto() 

plot(1:10)
text(5, 8, "Some text in serif", family = "serif")
text(5, 5, "Some text in mono-spaced", family = "mono")
text(5, 2, "Some text in sans-serif", family = "sans")

由 reprex package 创建于 2020-10-09| (v0.3.0)

devtools::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value                       
#>  version  R version 4.0.2 (2020-06-22)
#>  os       Ubuntu 20.04.1 LTS          
#>  system   x86_64, linux-gnu           
#>  ui       X11                         
#>  language (EN)                        
#>  collate  en_US.UTF-8                 
#>  ctype    en_US.UTF-8                 
#>  tz       Europe/Rome                 
#>  date     2020-10-09                  
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
#>  package     * version     date       lib source                         
#>  assertthat    0.2.1       2019-03-21 [1] CRAN (R 4.0.2)                 
#>  backports     1.1.10      2020-09-15 [1] CRAN (R 4.0.2)                 
#>  callr         3.4.4       2020-09-07 [1] CRAN (R 4.0.2)                 
#>  cli           2.0.2       2020-02-28 [1] CRAN (R 4.0.2)                 
#>  crayon        1.3.4       2017-09-16 [1] CRAN (R 4.0.2)                 
#>  curl          4.3         2019-12-02 [1] RSPM (R 4.0.2)                 
#>  desc          1.2.0       2018-05-01 [1] CRAN (R 4.0.2)                 
#>  devtools      2.3.2       2020-09-18 [1] CRAN (R 4.0.2)                 
#>  digest        0.6.25      2020-02-23 [1] CRAN (R 4.0.2)                 
#>  ellipsis      0.3.1       2020-05-15 [1] CRAN (R 4.0.2)                 
#>  evaluate      0.14        2019-05-28 [1] CRAN (R 4.0.2)                 
#>  fansi         0.4.1       2020-01-08 [1] CRAN (R 4.0.2)                 
#>  fs            1.5.0       2020-07-31 [1] CRAN (R 4.0.2)                 
#>  glue          1.4.2       2020-08-27 [1] CRAN (R 4.0.2)                 
#>  highr         0.8         2019-03-20 [1] CRAN (R 4.0.2)                 
#>  htmltools     0.5.0       2020-06-16 [1] CRAN (R 4.0.2)                 
#>  httr          1.4.2       2020-07-20 [1] CRAN (R 4.0.2)                 
#>  knitr         1.30        2020-09-22 [1] CRAN (R 4.0.2)                 
#>  magrittr      1.5         2014-11-22 [1] CRAN (R 4.0.2)                 
#>  memoise       1.1.0       2017-04-21 [1] CRAN (R 4.0.2)                 
#>  mime          0.9         2020-02-04 [1] CRAN (R 4.0.2)                 
#>  pkgbuild      1.1.0       2020-07-13 [1] CRAN (R 4.0.2)                 
#>  pkgload       1.1.0       2020-05-29 [1] CRAN (R 4.0.2)                 
#>  prettyunits   1.1.1       2020-01-24 [1] CRAN (R 4.0.2)                 
#>  processx      3.4.4       2020-09-03 [1] CRAN (R 4.0.2)                 
#>  ps            1.3.4       2020-08-11 [1] CRAN (R 4.0.2)                 
#>  R6            2.4.1       2019-11-12 [1] CRAN (R 4.0.2)                 
#>  remotes       2.2.0       2020-07-21 [1] CRAN (R 4.0.2)                 
#>  rlang         0.4.7       2020-07-09 [1] CRAN (R 4.0.2)                 
#>  rmarkdown     2.4         2020-09-30 [1] CRAN (R 4.0.2)                 
#>  rprojroot     1.3-2       2018-01-03 [1] CRAN (R 4.0.2)                 
#>  sessioninfo   1.1.1       2018-11-05 [1] CRAN (R 4.0.2)                 
#>  showtext    * 0.9         2020-08-13 [1] RSPM (R 4.0.2)                 
#>  showtextdb  * 3.0         2020-06-04 [1] RSPM (R 4.0.2)                 
#>  stringi       1.5.3       2020-09-09 [1] CRAN (R 4.0.2)                 
#>  stringr       1.4.0       2019-02-10 [1] CRAN (R 4.0.2)                 
#>  sysfonts    * 0.8.1       2020-05-08 [1] RSPM (R 4.0.2)                 
#>  testthat      2.99.0.9000 2020-10-01 [1] Github (r-lib/testthat@3b0b970)
#>  usethis       1.6.3       2020-09-17 [1] CRAN (R 4.0.2)                 
#>  withr         2.3.0       2020-09-22 [1] CRAN (R 4.0.2)                 
#>  xfun          0.18        2020-09-29 [1] CRAN (R 4.0.2)                 
#>  xml2          1.3.2       2020-04-23 [1] CRAN (R 4.0.2)                 
#>  yaml          2.2.1       2020-02-01 [1] CRAN (R 4.0.2)                 
#> 
#> [1] /home/cl/R/x86_64-pc-linux-gnu-library/4.0
#> [2] /usr/local/lib/R/site-library
#> [3] /usr/lib/R/site-library
#> [4] /usr/lib/R/library

系统字体

> X11Fonts()
$serif
[1] "-*-times-%s-%s-*-*-%d-*-*-*-*-*-*-*"

$sans
[1] "-*-helvetica-%s-%s-*-*-%d-*-*-*-*-*-*-*"

$mono
[1] "-*-courier-%s-%s-*-*-%d-*-*-*-*-*-*-*"

$Times
[1] "-adobe-times-%s-%s-*-*-%d-*-*-*-*-*-*-*"

$Helvetica
[1] "-adobe-helvetica-%s-%s-*-*-%d-*-*-*-*-*-*-*"

$CyrTimes
[1] "-cronyx-times-%s-%s-*-*-%d-*-*-*-*-*-*-*"

$CyrHelvetica
[1] "-cronyx-helvetica-%s-%s-*-*-%d-*-*-*-*-*-*-*"

$Arial
[1] "-monotype-arial-%s-%s-*-*-%d-*-*-*-*-*-*-*"

$Mincho
[1] "-*-mincho-%s-%s-*-*-%d-*-*-*-*-*-*-*"

谢谢

Answer 1

我在 Ubuntu 20.04 上也遇到了完全相同的问题(从 18.04 升级后)。
对我有用的是使用 family="monospace" (而不是 family="mono" )。
例如:

plot(1:10)
text(5, 8, "Some text in serif", family = "serif")
text(5, 5, "Some text in mono-spaced", family = "monospace")  ## instead of "mono"!
text(5, 2, "Some text in sans-serif", family = "sans")

结果: