I want to make a plot with a vertical line to represent the beggining of a policy. How can I add this vertical line to the legend of the plot?
example:
df <- tibble(year = 2010:2014, value = c(1,2,3,3,4))
df %>%
ggplot(aes(x = year, y = value))
geom_line()
geom_vline(xintercept = 2012, linetype = 4)
I've tried show_legend = T but nothing happens. This is the plot
CodePudding user response:
You have to take xintercept = 2012, linetype = "dotdash"
part inside aes()
like the following code to show the legend
df %>%
ggplot(aes(x = year, y = value))
geom_line()
geom_vline(aes(xintercept = 2012, linetype = "dotdash"))
scale_linetype_manual(values=c("dotdash"), name = "vline")
theme_bw()