角落缺少geom_tile边框 [英] geom_tile border missing at corners

问题描述

我有以下数据框:

# Dummy data frame
df <- expand.grid(x = 1:3, y = 1:3)

我想像这样使用ggplot2将其绘制为geom_tile:

I would like to plot it as a geom_tile using ggplot2 like so:

# Tile plot
ggplot(df) + 
  geom_tile(aes(x = x, y = y), 
            fill = NA, colour = "red", size = 3, width = 0.7, height = 0.7)

给出，

但是，请注意，在每个图块的左上角都缺少一个缺口，该缺口的边界与边缘没有很好地吻合.如果使用geom_rect，则会得到相同的结果.有避免这种情况的解决方法吗?

Notice, however, that in the top left corner of each tile there is a notch missing where the border doesn't quite dovetail correctly. I get the same result if I use geom_rect. Is there a workaround to avoid this?

R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

Matrix products: default  

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

other attached packages:
[1] ggplot2_3.1.0     kitchendraw_0.1.0

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.0       rstudioapi_0.8   bindr_0.1.1      magrittr_1.5     tidyselect_0.2.5 munsell_0.5.0    colorspace_1.3-2
 [8] R6_2.3.0         rlang_0.3.0.1    plyr_1.8.4       dplyr_0.7.7      tools_3.5.1      grid_3.5.1       gtable_0.2.0    
[15] withr_2.1.2      yaml_2.2.0       lazyeval_0.2.1   assertthat_0.2.0 tibble_1.4.2     crayon_1.3.4     bindrcpp_0.2.2  
[22] purrr_0.2.5      glue_1.3.0       labeling_0.3     compiler_3.5.1   pillar_1.3.0     scales_1.0.0     pkgconfig_2.0.2 

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根据以下评论更新的数字

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Updated figure in response to a comment below

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此问题已由此更新为ggplot2.

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