1

我正在尝试在 ggplot 中添加一个段。但是，添加alpha会导致该段消失。尽管这是许多 SO 帖子中记录的已知行为，但我遇到了一件特别奇怪的事情：当我生成情节时，reprex()我看到了该片段，否则我没有。

示例reprex()

library(ggplot2)
library(ggforce)


df_empty_circle <- 
  data.frame(x = 0,
             y = 0, 
             r = 1)


p_empty_circle <- 
  ggplot(df_empty_circle) + 
  geom_circle(mapping = aes(x0 = x, y0 = y, r = r)) + 
  coord_fixed() +
  theme_void()


p_no_alpha <- 
  p_empty_circle +
  annotate(geom = "segment", y = -1, yend = -1, x = -Inf, xend = 0)


p_no_alpha


p_with_alpha <-
  p_empty_circle +
  annotate(geom = "segment", y = -1, yend = -1, x = -Inf, xend = 0, alpha = 0.2)

p_with_alpha

由reprex 包于 2021-08-02 创建 (v2.0.0 )

运行代码时的示例reprex

好吧，和上面的代码一样，输出是：

p_no_alpha

p_no_alpha_no_reprex

p_with_alpha

p_with_alpha_no_reprex

为什么在p_with_alpha外面运行时没有段reprex()？

会话信息

R version 4.1.0 (2021-05-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 8.1 x64 (build 9600)

Matrix products: default

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United States.1252    

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

other attached packages:
[1] reprex_2.0.0  dplyr_1.0.7   ggforce_0.3.3 ggplot2_3.3.5

对此有什么解释吗？

4

0 回答 0