makie axis bracket

makie_axis_bracket.jl

function bracketlabel!(ax, label, mi, ma, axoffset, bracketwidth, labeloffset)
    bracketpoints = lift(ax.finallimits, ax.scene.px_area) do lims, px_area
                
        x = minimum(lims)[1]
        pmin = Makie.project(ax.scene, Point2f(x, mi))
        pmax = Makie.project(ax.scene, Point2f(x, ma))

        ps = Point2f[
            pmin,
            pmin - Point2f(bracketwidth, 0),
            pmax - Point2f(bracketwidth, 0),
            pmax
        ] .- Point2f(axoffset, 0)
        ps .+ Point2f(px_area.origin)
    end

    labelpoint = lift(bracketpoints, labeloffset) do ps, loff
        (ps[2] + ps[3]) / 2 - Point2f(loff, 0)
    end

    s = MakieLayout.get_topscene(ax.parent)
    text!(s, label, position = labelpoint, rotation = pi/2, align = (:center, :bottom))
    lines!(s, bracketpoints)
end

f = Figure()

ax, hm = heatmap(f[1, 1], randn(20, 20))
ax.yticklabelspace = 120

bracketlabel!(ax, "group 1", 1, 5, 40, 5, 5)
bracketlabel!(ax, "group 2", 6, 10, 40, 5, 5)
bracketlabel!(ax, "group 3", 11, 15, 40, 5, 5)
bracketlabel!(ax, "group 4", 16, 20, 40, 5, 5)
bracketlabel!(ax, "supergroup1", 1, 10, 90, 5, 5)
bracketlabel!(ax, "supergroup1", 11, 20, 90, 5, 5)


f