affine transformation feature

[trevorld]

• In the comments to r-lib/pkgdown#2314 @hadley asked me to open an issue here.
• The affine transformation feature was introduced in R 4.2. Here is an article about it by Paul Murrell: https://www.stat.auckland.ac.nz/~paul/Reports/GraphicsEngine/groups/groups.html
• My packages {affiner} and {piecepackr} use the affine transformation feature (the latter since April, 2022) and {pkgdown} won't render all of my examples that use this feature because currently {pkgdown} always uses {ragg} to record the graphics and {ragg} doesn't support this feature yet.
• Here is an example from {piecepackr} using the affine transformation feature with R's Cairo devices:

library("piecepackr")
envir <- game_systems()
dice <-  c("d4", "numeral", "d8", "d10_percentile", "d10", "d12", "d20")
cfg <- paste0("dice_", dice)
grid.piece("die_face", suit = c(1:6, 1), rank = 1:7,
           cfg = cfg, envir = envir, x = 1:7, y = 1,
           default.units = "in", op_scale = 0.5)

[trevorld]

A quick Github search suggests that at least {ggblend} and {xdvir} also use this feature.