将标签添加到注释 rect ggplot

问题描述

我正在加班改变情节行为。我想包括阴影区域以强调某些阶段。目前我正在使用 annotate("rect" x=POSIXct("")..然后添加 annotate("label")...

有没有办法将标签直接添加到阴影区域，其中标签文本的大小和环绕会改变以适应阴影区域？或者，是否有更有效的方法来尝试在日期范围阴影区域中放置标签？

    myDF <- labeled_rectxlsx

> str(myDF)
tibble [37 × 3] (S3: tbl_df/tbl/data.frame)
$ schDate   : POSIXct[1:37],format: "2020-10-22" "2020-10-23" "2020-11-09"
"2020-11-12" ...
$ rating    : num [1:37] NA NA NA NA NA NA NA NA NA NA ...
$ rect_label: chr [1:37] NA NA NA NA ...

schDate rating   rect_label
...
  11 2020-12-14     NA         <NA>
  12 2020-12-15     NA         <NA>
  13 2020-12-16     NA         <NA>
  14 2020-12-17     NA         <NA>
  15 2020-12-18     NA Winter Break
16 2021-01-03     NA         <NA>
  17 2021-01-04      6         <NA>
  18 2021-01-05      8         <NA>
  19 2021-01-06      5         <NA>
  20 2021-01-07      8         <NA>
  21 2021-01-08      7         <NA>
  22 2021-01-11      6         <NA>
  
maxY <- max(labeled_rectxlsx$rating,na.rm=TRUE)
insideY= (maxY*.98)



p <- myDF %>%
  ggplot(aes(x= schDate,y=rating))+
  geom_point()+
  geom_line()+
  theme_classic()+
  theme(
    plot.title = element_text(size=20,face="bold"),axis.title.x = element_blank(),axis.title.y = element_text(size=14,axis.text.x = element_text(size=12),axis.text.y = element_text(size=12))+
    annotate("rect",xmin = as.POSIXct("2020-12-19"),xmax = as.POSIXct("2021-01-03"),ymin = -Inf,ymax = Inf,fill = "gray",alpha =.5)+
    annotate("label",x=as.POSIXct("2020-12-27"),y= insideY,label="Winter Break",fill="black",color="white",fontface="bold",size=4,vjust="inward")
  
p

sample chart

解决方法

为了稍微扩展评论，您可以使用带有虚拟 data.frame 的 ggfittext 包来保存值，并结合 inherit.aes = FALSE。

示例如下：

library(ggfittext)
#> Warning: package 'ggfittext' was built under R version 4.0.3
library(ggplot2)

set.seed(0)

myDF <- data.frame(
  schDate = seq(Sys.Date() - 100,Sys.Date(),by = "1 day"),rating = cumsum(rnorm(101))
)

ggplot(myDF,aes(schDate,rating)) +
  geom_point() +
  geom_line() +
  annotate("rect",xmin = as.Date("2020-12-19"),xmax = as.Date("2021-01-03"),ymin = -Inf,ymax = Inf,fill = "gray",alpha =.5) +
  geom_fit_text(
    data = data.frame(xmin = as.Date("2020-12-19"),label = "Winter Break"),aes(xmin = xmin,xmax = xmax,ymin = 4,ymax = 5,label = label),inherit.aes = FALSE
  )

^{由 reprex package (v1.0.0) 于 2021 年 2 月 9 日创建}

annotate ggplot2 r r