如何在 facet_wrap 中使用 label_wrap_gen 和 as_labeller

Question

我有一个分面图，并且想将分面条标题包装在多行上（如果超过一定数量的字符），所以我知道我使用labeller = label_wrap_gen(10)（例如包装超过 10 个字符），这在传递给 时效果很好facet_wrap，但是，我还想传递新标签。我知道我可以labeller = as_labeller(new labels)用来做到这一点。有没有办法一起做？我不想弄乱数据并直接在 data.frame 中重新标记它们（在我自己的情况下是一个小标题）。

下面是一个示例来演示：

data(iris)

## plot iris lengths by species
ggplot(iris, aes(x=Sepal.Length, y=Petal.Length)) + 
  geom_point() + 
  facet_wrap(~Species)

## re-label species names
newLabs <- c(paste("this one is called", levels(iris$Species)))
newLabs <- setNames(newLabs, nm = levels(iris$Species))
ggplot(iris, aes(x=Sepal.Length, y=Petal.Length)) + 
  geom_point() + 
  facet_wrap(~Species, labeller = as_labeller(newLabs))

这产生了这个：

还使用时如何包装刻面条标题as_labeller？

sessionInfo
R version 4.0.0 (2020-04-24)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS High Sierra 10.13.6

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8

attached base packages:
[1] stats4    parallel  stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] rsconnect_0.8.16     forcats_0.5.0        stringr_1.4.0        purrr_0.3.4          readr_1.3.1         
 [6] tibble_3.0.1         tidyverse_1.3.0      gtools_3.8.2         dendextend_1.13.4    patchwork_1.0.1     
[11] gridExtra_2.3        plotly_4.9.2.1       pRolocdata_1.26.0    tidyr_1.1.0          reshape2_1.4.4      
[16] pRoloc_1.29.0        BiocParallel_1.22.0  MLInterfaces_1.68.0  cluster_2.1.0        annotate_1.66.0     
[21] XML_3.99-0.3         AnnotationDbi_1.50.0 IRanges_2.22.2       MSnbase_2.14.2       ProtGenerics_1.20.0 
[26] S4Vectors_0.26.1     mzR_2.22.0           Rcpp_1.0.4.6         Biobase_2.48.0       BiocGenerics_0.34.0 
[31] ggplot2_3.3.1        shinyhelper_0.3.2    colorspace_1.4-1     colourpicker_1.0     shinythemes_1.1.2   
[36] DT_0.13              shiny_1.4.0.2        dplyr_1.0.0         

Answer 1

你可以做

plot(iris, aes(x=Sepal.Length, y=Petal.Length)) + 
  geom_point() + 
  facet_wrap(~Species, labeller = as_labeller(newLabs, default=label_wrap_gen(10)))

在as_labeller采用默认的贴标机的功能。所以你只需要在那里传递标签包装器。