Facet vs layout

[greimel]

Probably faceting and layouting could be two different options in this package. Faceting is for grouping data, layouting for plotting different variables (as in your example in the docs)

First, layouting.

N = 500
x = rand(N)
gx = rand(["x grp 1","x grp 2", "x grp 3"], N)
gy = rand(["y grp 1","y grp 2"], N)

df = DataFrame(g = g, x = x, y = (g .== "very") .+ x .+ randn(N), gx=gx, gy=gy)

cols = style(:x, :y);
grp = style(layout_x=:gx, layout_y=:gy)
scat = spec(Scatter)
pipeline = cols * scat
aog = data(df) * grp * pipeline

Now faceting, in the ggplot sense.

scene, layout = MakieLayout.layoutscene(fontsize=35, font="CMU Serif roman", resolution=round.(Int, (2 * 600, 2 * 540)))
layout.alignmode = Outside(0, 25, 0, 5)

AlgebraOfGraphics.layoutplot!(scene, layout, aog)
AbstractPlotting.save(joinpath("figures/layout.pdf"), scene)

x_facet_titles = sort!(unique(gx))
y_facet_titles = sort!(unique(gy))

grd_lay = layout.content[1].content

# remove xlabel and ylabel
for i in 1:length(grd_lay.content)
  ax = grd_lay.content[i].content
  ax.xlabelvisible[] = length(x_facet_titles) == 0
  ax.ylabelvisible[] = length(y_facet_titles) == 0
end

# add categories of x_facet variable and linked x_label
if length(x_facet_titles) > 0
  lax11 = grd_lay.content[1].content
  n = size(grd_lay)[1]
  for (i,t) in enumerate(x_facet_titles)
    text = LText(scene, t)
    text.tellheight = true
    text.tellwidth = false
    grd_lay[1,i,Top()] = LRect(scene, color = RGBAf0(0,0,0,0.2), strokevisible=false) 
    grd_lay[1,i,Top()] = text
  end
  
  xlabel_facet = LText(scene, string(lax11.xlabel[]))
  xlabel_facet.tellheight = true
  xlabel_facet.tellwidth = false
  grd_lay[end+1,:] = xlabel_facet
end

# add categories of y_facet variable and linked y_label
if length(y_facet_titles) > 0
  lax11 = grd_lay.content[1].content
  n = size(grd_lay)[2]
  for (i,t) in enumerate(y_facet_titles)
    text = LText(scene, t, rotation=π/2)
    text.tellheight = false
    text.tellwidth = true
    grd_lay[i,n, Right()] = LRect(scene, color = RGBAf0(0,0,0,0.2), strokevisible=false) 
    grd_lay[i,n, Right()] = text
  end
  
  ylabel_facet = LText(scene, string(lax11.ylabel[]), rotation = π/2)
  ylabel_facet.tellheight = false
  ylabel_facet.tellwidth = true
  grd_lay[1:end-1,0] = ylabel_facet
end

[asinghvi17]

It may be worth it to increase the padding between axes in the last plot, through colgap!.