Change default shape behaviour

[iferres]

ggplot2 includes the update_geom_defaults() and theme_set() functions to override the default behaviour of the package. This is great to (for instance) generate an organizational identity regarding graphics aesthetics. One can easily create a custom theme and apply it to all the graphics without the need to specify it, which saves A LOT of time. Also you can change the default point size, the default font family, etc.

And here's my question: whereas you can provide a default point shape, is it possible to change the default behaviour for generating a shape scale? I noticed that the shape scale is generated by scales::shape_pal(), my question is if I could change my default shapes to 21, 22, 23, 24, and 25 which allow fill and colour aesthetics, without need to provide them through ... + scale_shape_manual(), may be providing an alternative function or a simply a list from where grab the shapes.

An analogous question regarding default colour scales has to be made also 😅
Thank you!

[iferres]

Suggested interface:

update_scale_defaults(scale = "shape", new =  `function() ...`)
update_scale_defaults(scale = "colour", new =  `function() ...`)
update_scale_defaults(scale = "fill", new =  `function() ...`)

[clauswilke]

This has been discussed: #2691

It's a useful feature to have, but difficult to implement. This issue would have to be addressed first: #4269.