发现了一个奇怪的边缘情况。
假设您想要一个带有标记段的堆叠条形图(撇开这种图是否是最佳数据即)
library(ggplot2)
set.seed(123)
dat <- data.frame(x = rep(1:5, each=3),
y = round(runif(5*3, 5, 10)),
category = letters[1:3])
# this looks normal: labels on correct segments
ggplot(dat,
aes(x, y, fill=category, label=paste0(category, ': ', y))) +
geom_col() +
geom_text(position = position_stack(vjust=.5))
现在让我们重新着色一些标签:
# this is weird now
ggplot(dat,
aes(x, y, fill=category, label=paste0(category, ': ', y))) +
geom_col() +
geom_text(aes(color = category == 'a'),
position = position_stack(vjust=.5)) +
scale_color_manual(values = c("black", 'white'))
堆栈顺序已更改,这是出乎意料的,我不确定如何解决此问题。
> sessionInfo()
R version 3.5.0 (2018-04-23)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.4
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] ggplot2_3.0.0.9000
loaded via a namespace (and not attached):
[1] Rcpp_0.12.16 digest_0.6.15 withr_2.1.2 dplyr_0.7.4 assertthat_0.2.0 grid_3.5.0 plyr_1.8.4 R6_2.2.2
[9] gtable_0.2.0 magrittr_1.5 scales_0.5.0 pillar_1.2.2 rlang_0.2.1 lazyeval_0.2.1 bindrcpp_0.2.2 labeling_0.3
[17] tools_3.5.0 glue_1.2.0 munsell_0.4.3 yaml_2.1.19 compiler_3.5.0 pkgconfig_2.0.1 colorspace_1.3-2 bindr_0.1.1
[25] tibble_1.4.2
最佳答案
啊,这是一个答案 + 解决方法。发生这种情况是因为 aes(color = ...)
调用是在 geom_text
级别调用的,而不是在初始 ggplot 调用中调用的。
统一到单个 aes
调用将导致 geom_col 和 geom_text 遵循相同的顺序,但需要一些技巧才能使颜色美观仅显示在文本层上:
ggplot(dat,
aes(x, y, fill=category, label=paste0(category, ': ', y),
color = category == 'a')) +
# if you call geom_col just like this, you'll get colored borders
# geom_col() +
# so you have to blank out the color aesthetic for this geom
geom_col(color=NA) +
geom_text(position = position_stack(vjust=.5)) +
scale_color_manual(values = c("black", 'white'))
关于r - ggplot : adding color aesthetic changes stack order,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51734285/