I want to add two arrows with corresponding text to the outside of the Y axis in a ggplot2 plot, but the X axis is a categorical variable, and I have only found solutions (implemented below) when both variables are numerical. Is there a way to do this when one or both of them are categorical?
Here is a minimal reprex using the iris dataset and the clip = "off" argument in coord_cartesian():
library(tidyverse)iris |> ggplot(aes(x = Species, y = Sepal.Length)) + geom_boxplot(aes(fill = Species)) + coord_cartesian(clip = "off") + annotate("text", x = 1, xend = 1, y = 7.5, yend = 8, label = "Longer sepal", angle = 90 ) + annotate("text", x = 1, xend = 1, y = 5.5, yend = 6, label = "Shorter sepal", angle = 90 ) +(I have not added the code to add the arrows to keep the example short, but a solution for the text annotation would also work instantly for the arrows). If I use negative values for the x coordinates, it just extends the grey plot area to the left, but still places the text annotation inside the plot, and not to the left of the Y axis.
However, I want to achieve something similar to this mockup:
