如何在 R 中的 goem_hline() 中添加和编辑图例

Question

我正在尝试为 geom_hline () 添加标题，但我不知道该怎么做。

我试过 geom_hline (aes (yintercept = 18, 'Historical serie'), size = 1.5, col =" # ffff00 ") 但它 returns 出错了。我拍了 'Historical serie' 它起作用了，但是标题没有出现。

library(tidyr)
library(dplyr)
library(lubridate)
library(ggplot2)

date2<-c('01/01/2000','08/08/2000','16/03/2001','06/09/2001')
name<-c('A','B','A','B')
total<-c(23,25,36,41)
esp<-c(0.363,0.4123,0.09,0.65)

df<-data.frame(date2,name, total, name, esp)%>%
  mutate(date3=as.Date(date2, "%d/%m/%Y"))%>%
  mutate(year_date=as.Date(trunc(as.POSIXlt(date3), "years")))

ggplot(data=df, aes(x=year_date, y=total, fill=name))+ 
  geom_col(position = "dodge")+
  scale_fill_manual(values=c("#08088A","#9F81F7"))+
  theme_light()+labs(fill="rain", title ="rain anual", x="Estation", y="total mm")+
  theme(axis.text.x = element_text(angle = 90))+
  geom_hline(aes(yintercept = 18, 'Historiacal serie'), size=1.5, col="#ffff00")

预期

我希望显示值 18 以及黄线的描述 Historical serie。

Answer 1

更新：OP 请求：

p <- ggplot(data=df, aes(x=year_date, y=total, fill=name))+ 
  geom_col(position = "dodge")+
  scale_fill_manual(values=c("#08088A","#9F81F7"))+
  theme_light()+labs(fill="rain", title ="rain anual", x="Estation", y="total mm")+
  theme(axis.text.x = element_text(angle = 90)) 

data_line <- data.frame(yintercept=18, data_line=factor(18))

p + 
  geom_hline(data=data_line, aes(yintercept=yintercept, linetype="18"), size=1.5, col="#ffff00") +
  scale_linetype_manual(name = "Historiacal serie",values = c(1,1))

Answer 2

我在 https://community.rstudio.com/t/how-to-add-legend-in-goem-hline-in-r/105127/2 的帮助下得到它，只使用 geom_hline ()

备选

date2<-c('01/01/2000','08/08/2000','16/03/2001','06/09/2001')
name<-c('A','B','A','B')
total<-c(23,25,36,41)
esp<-c(0.363,0.4123,0.09,0.65)

ggplot(data=df, aes(x=year_date, y=total, fill=name))+ 
  geom_col(position = "dodge")+
  scale_fill_manual(values=c("#08088A","#9F81F7"))+
  theme_light()+labs(fill="rain", title ="rain anual", x="Estation", y="total mm")+
  theme(axis.text.x = element_text(angle = 90))+
  geom_hline(aes(yintercept = 18, linetype = "18"), colour = "green", size=1.5) +
scale_linetype_manual(name ="Historical serie", values = c('solid'))

如何在 R 中的 goem_hline() 中添加和编辑图例

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