errorbar legend overload

[Moelf]

https://discourse.julialang.org/t/makie-errorbars-in-legend-look-awkward/104832/2?u=jling

It would be nice to have a vertical line for errorbar legend, right now it doesn't combine usefully with lines:

stairs([1,3,2,1]; label="x")
errorbars!((2:4) .- 0.5, [3,2,1], [2,3,4]; label="x")

axislegend(; merge=true)
current_figure()

[asinghvi17]

You can define Makie.legendelements(plot::Errorbars, legend) in order to do this.

See e.g.

Makie.jl/src/makielayout/blocks/legend.jl

Lines 500 to 510 in 2fe1ac4

	function legendelements(plot::Union{Violin, BoxPlot, CrossBar}, legend)
	color = extract_color(plot, legend[:polycolor])
	LegendElement[PolyElement(
	color = color,
	strokecolor = choose_scalar(plot.strokecolor, legend[:polystrokecolor]),
	strokewidth = choose_scalar(plot.strokewidth, legend[:polystrokewidth]),
	colormap = get(plot, :colormap, :viridis),
	colorrange = get(plot, :colorrange, automatic),
	alpha = get(plot, :alpha, 1f0),
	)]
	end