Add reference lines to plot in VegaLite.jl

Specific Domains Visualization
1

I’m trying to add 2 reference horizontal lines to this plot, but my attempt doesn’t extend the lines to the y-axis, which is what I want. Any suggestions?

using DataFrames
using VegaLite

df = DataFrame(m = 1:5, ll=21:25, ul=:31:35)

df |> @vlplot(x=:m, height=400, width=400) +
  @vlplot(:point, y=:ul) +
  @vlplot(:point, y=:ll) +
  @vlplot(mark={:line, color=:red}, y={datum=26}) +
  @vlplot(mark={:line, color=:black}, y={datum=0}) +
  @vlplot(:rule, y=:ul, y2=:ll)
2

I managed to force the reference lines with

df |> @vlplot(x=:m, height=400, width=400) +
  @vlplot(:point, y=:ul) +
  @vlplot(:point, y=:ll) +
  @vlplot(mark={:line, color=:red}, y={datum=26}, x=[i for i in 0:0.1:5]) +
  @vlplot(mark={:line, color=:black}, y={datum=0}, x=[i for i in 0:0.1:5]) +
  @vlplot(:rule, y=:ul, y2=:ll)

But now the title of the x-axis disappears.

3

Just did this:

df |> @vlplot(x=:m, height=400, width=400) +
    @vlplot(mark={:point, filled=true, color=:blue}, y=:ul) +
    @vlplot(mark={:point, filled=true, color=:blue}, y=:ll) +
    @vlplot(mark={:line, color=:red}, y={datum=26}, x={[i for i in 0.0:0.1:5], title="M"}) +
    @vlplot(mark={:line, color=:black}, y={datum=0}, x={[i for i in 0.0:0.1:5], title="M"}) +
    @vlplot(mark={:rule, color=:blue}, y=:ul, y2=:ll)