excessive legend size causes "Viewport has zero dimension(s)" error · slowkow/ggrepel#113

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描述

Summary

When the legend is too large and ggrepel is used, the following obtuse error text is produced:

Error in grid.Call(C_convert, x, as.integer(whatfrom), as.integer(whatto), : Viewport has zero dimension(s)

Minimal code example

Here is the minimum amount of code needed to demonstrate the issue:

library(ggplot2)
library(ggrepel)
library(ggplot2movies)
ggplot(movies[1:300,], aes(y = year, x = length, color = factor(title))) +
  geom_point() +
  geom_text_repel(aes(label = title))

Suggestions

Improve the wording of the error message to indicate that the legend is too large.

A legend this large is useless, and hiding it fixes the problem.

library(ggplot2movies)
ggplot(movies[1:300,], aes(y = year, x = length, color = factor(title))) +
  geom_point() +
  geom_text_repel(aes(label = title)) + 
  theme(legend.position="none")

Version information

Here is the output from sessionInfo() in my R session:

R version 3.5.0 (2018-04-23)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.2

Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRlapack.dylib

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

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

other attached packages:
[1] ggrepel_0.8.0       ggplot2_3.0.0       ggplot2movies_0.0.1 lmerTest_3.0-1      lme4_1.1-17        
[6] Matrix_1.2-14      

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.17      compiler_3.5.0    pillar_1.2.3      nloptr_1.0.4      plyr_1.8.4       
 [6] bindr_0.1.1       tools_3.5.0       digest_0.6.15     tibble_1.4.2      gtable_0.2.0     
[11] nlme_3.1-137      lattice_0.20-35   pkgconfig_2.0.1   rlang_0.2.1       yaml_2.1.19      
[16] mvtnorm_1.0-8     bindrcpp_0.2.2    coda_0.19-1       withr_2.1.2       dplyr_0.7.5      
[21] lsmeans_2.27-62   tidyselect_0.2.4  grid_3.5.0        glue_1.2.0        R6_2.2.2         
[26] survival_2.41-3   multcomp_1.4-8    TH.data_1.0-8     minqa_1.2.4       purrr_0.2.5      
[31] magrittr_1.5      scales_0.5.0      codetools_0.2-15  MASS_7.3-49       splines_3.5.0    
[36] assertthat_0.2.0  xtable_1.8-2      colorspace_1.3-2  numDeriv_2016.8-1 labeling_0.3     
[41] sandwich_2.4-0    estimability_1.3  lazyeval_0.2.1    munsell_0.5.0     zoo_1.8-2

貢獻者指南

技術棧: 無
領域: data
議題類型: bug
難度: 3
預計時間: 1-3 hours
活動狀態: stale
清晰度: clear
前置要求: Rggplot2
新手友善度: 60
研究方向: Investigate the source of the 'Viewport has zero dimension(s)' error. It likely originates from grid graphics when the legend is too large. The fix involves detecting when the legend occupies the entire viewport and providing a clearer error message. Look at the ggrepel source code in R/geom text repel.R or similar files. Consider adding a tryCatch to capture the error and re raise with a more informative message.