Axis as marker=

[jariji]

Feature description

I keep seeing cool plots which have axes positioned at data coordinates. I would like to try using an Axis (or some wrapper around it) as a scatter marker.

I realize it's possible to do this manually using pixel coordinates. My question is if there's any possibility of using the marker= API to simplify such usage.

Plots from paper:

[asinghvi17]

I guess we could have a marker conversion that calls colorbuffer on a Scene? It's not exactly live rendering, though...

[aplavin]

colorbuffer is exactly what I thought as well:

scatter(randn(10), randn(10), marker=map(1:10) do _
	fig, ax, _ = scatter(cumsum(randn(100)), figure=(;size=(150,150)))
	hidedecorations!(ax)
	Matrix(colorbuffer(fig))
end, markersize=100)

[asinghvi17]

This could also be done with MakieTeX's SVGDocument or PDFDocument if you want true vector rendering

[SimonDanisch]

We could also think about something like this:

import Makie.SpecApi as S
@recipe PlotScatter (positions,) begin
    marker = nothing
    markersize = (60, 60)
end

Makie.conversion_trait(::Type{<:PlotScatter}) = Makie.PointBased()

Makie.data_limits(p::PlotScatter) = Rect3f(p.positions[])
function Makie.plot!(p::PlotScatter)
    pscene = Makie.parent_scene(p)
    broadcast_foreach(p.positions[], p.marker[], p.markersize[]) do pos, marker, markersize
        rectpix = Observable(Rect2f(0, 0, 0, 0))
        rectpix_off = Observable(Rect2i(0, 0, 0, 0))
        onany(pscene.camera.projectionview, pscene.viewport; update=true) do pv, vp
            ppix = Makie.project(pscene, pos)
            rectpix[] = Rect2i(ppix, markersize)
            rectpix_off[] = Rect2i(vp.origin .+ ppix, markersize)
        end
            
        sub = Scene(pscene, rectpix_off)
        cam2d!(sub)
        pl = plotlist!(sub, marker)
        center!(sub)
        linesegments!(p, rectpix, space=:pixel)
    end

    return
end


f, ax, pl = plotscatter(rand(Point2f, 10); marker=map(1:10) do x
    S.Lines(cumsum(randn(100)), color=rand(RGBf))
end)
limits!(ax, Rect2f(data_limits(ax.scene))) # honestly not sure why this is needed
f