Could the y axis title be moved with the axis when `coord_radial(r_axis_inside = TRUE)`?

[davidhodge931]

Currently it stays put at at 3 o clock when coord_radial(r_axis_inside = TRUE).

Could it be moved with the axis?

library(tidyverse)
ggplot(mpg, aes(class, displ)) +
  geom_boxplot() +
  coord_radial(r_axis_inside = TRUE) +
  theme_classic()

^{Created on 2024-03-02 with reprex v2.1.0}

[teunbrand]

Axis title placement is controlled by the facets, not the axes or coord.
You could extend guides to draw a title, but you'd get double titles.

[teunbrand]

I'm just gonna say this is hard to achieve given the way facets/coords and the layout interact to put up axis titles. For this reason, I don't think we should implement this in ggplot2.

When {legendry} is released, hopefully soon-ish, you could do the following to make a title following the radius axis.

library(legendry)
#> Loading required package: ggplot2

ggplot(mpg, aes(class, displ)) +
  geom_boxplot() +
  guides(r = compose_stack("axis", primitive_title("displ", angle = 90))) +
  coord_radial(start = 0.25 * pi, end = 1.75 * pi)

^{Created on 2024-10-29 with reprex v2.1.1}