sec_axis implementation

[dialectic-of-phylogeny]

Describe how it works in R's ggplot2
Adding a second axis: https://ggplot2.tidyverse.org/reference/sec_axis.html

Describe any changes you think should be made to R's version
It seems one has to specify the numerical transformation for the second axis with respect to the first. Other plotting packages, e.g. Makie.jl, matplotlib, do not require this. The latter is better from the user's perspective.

[rdboyes]

There isn't a clean implementation of this functionality in Makie.jl and the way they currently recommend for you to do this is subject to change, so it's not something I plan to prioritize prior to a 1.0 release. That said, you can use Makie to customize TidierPlots, so there's nothing stopping anyone from adding a second axis the Makie way in the meantime:

using TidierPlots, DataFrames, CairoMakie

df = DataFrame(x = [1, 2], y = [3, 4], y2 = [5, 6])

gg = ggplot(df) + 
    geom_point(@aes(x = x, y = y))

f = TidierPlots.as_GridLayout(gg)

f, _, p = plot(f)

ax2 = Axis(f[1,1], yaxisposition = :right)
hidespines!(ax2)
hidexdecorations!(ax2)
scatter!(ax2, df.x, df.y2, color = :red)

f

[dialectic-of-phylogeny]

Okay, good to know. Thanks!