Allow customization of axis in recipes

[juliohm]

The recipe system allows the selection of axis based on types:

Makie.args_preferred_axis(obj::Object1) = Makie.Axis
Makie.args_preferred_axis(obj::Object2) = Makie.Axis3

Unfortunately, many default options in Axis and Axis3 do not meet expectations of users. It would be great if a new function Makie.args_preferred_axis_defaults was introduced to set the defaults within recipes. For example:

Makie.args_preferred_axis_defaults(obj::Object2) = (aspect=:data, viewmode=:free, perspectiveness=0.5)

[juliohm]

Example where the default options produce undesired results (e.g., spheres that are not perfectly round):

JuliaGeometry/Meshes.jl#1261

[aplavin]

Relevant refs: #5205 #1524 #379 #4174.

Some things you can do now:

• return SpecApi objects from your convert_arguments
• overload Makie.plot!(ax::AbstractAxis, plot::PlotType{Tuple{your_arguments}}) if the desired plot type can directly hold your arguments
• define a function like axplot(scatter, your_objects, ...) that calls scatter with required attributes and also creates/updates the axis as needed
• ...

[juliohm]

• overload Makie.plot!(ax::AbstractAxis, plot::PlotType{Tuple{your_arguments}}) if the desired plot type can directly hold your arguments

Thank you @aplavin. Do you have an example of this second approach?

[SimonDanisch]

We do want to implement something like:

Makie.args_preferred_axis_defaults(obj::Object2) = (aspect=:data, viewmode=:free, perspectiveness=0.5)

Very soon :)

[juliohm]

Thank you @SimonDanisch. Do you have a rough estimate of when this feature will become available? It would be super helpful to know a date to plan some material for a course that is coming up. No worries if it is hard to estimate.

[juliohm]

I just noticed that we already have a PR with green tests :) Thank you @ffreyer!