Makie confidence bands recipe

bands.jl

using Makie
import AbstractPlotting: plot!

@recipe(Band, x, ylower, yupper) do scene
    Theme(;
    default_theme(scene, Mesh)...,
    color = RGBAf0(1.0,0,0,0.2)
    )
end

function band_connect(n)
    ns = 1:n-1
    ns2 = n+1:2n-1
    [ns ns .+ 1 ns2;
    ns .+ 1 ns2 .+ 1 ns2 ]
end

function plot!(plot::Band)
    coordinates = lift( (x, ylower, yupper) -> [x ylower; x yupper], plot[1], plot[2], plot[3])
    connectivity = lift(x -> band_connect(length(x)), plot[1])
    mesh!(plot, coordinates, connectivity;
        color = plot[:color], colormap = plot[:colormap], colorrange = plot[:colorrange],
        shading = false, visible = plot[:visible])
end