using Gadfly causes Method error in AlgebraOfGraphics.draw()

[jonasjonker]

I'm not really sure if this is a Gadfly.jl/Compose.jl or a AlgebraOfGraphics.jl issue so I thought I make an issue at both repos. here

I was making a notebook with plots from multiple packages (to compare them) when I found that using Gadfly introduces an error when calling AlgebraOfGraphics.draw(). The error message mentions some Compose.jl object, but the draw method I call and the AlgebraOfGraphics.Layer I call it on don't seem to be directly affected.

this works fine

julia> using AlgebraOfGraphics, RDatasets, CairoMakie

julia> const AoG = AlgebraOfGraphics

julia> iris = dataset("datasets", "iris")

julia> iris_frequency = AoG.data(iris) *
           AoG.mapping(:PetalLength, :PetalWidth) *
           AoG.mapping(color = :Species)

julia> fg1 = AoG.draw(iris_frequency)

julia> save("figure.png", fg1, px_per_unit = 3)

but using Gadfly introduces an error

julia> using Gadfly

# now throws an error
julia> fg2 = AoG.draw(iris_frequency)
ERROR: MethodError: no method matching size(::Compose.Property{Compose.FillPrimitive})
Closest candidates are:
  size(::Union{LinearAlgebra.QR, LinearAlgebra.QRCompactWY, LinearAlgebra.QRPivoted}) at /opt/julia/usr/share/julia/stdlib/v1.6/LinearAlgebra/src/qr.jl:524
  size(::Union{LinearAlgebra.QR, LinearAlgebra.QRCompactWY, LinearAlgebra.QRPivoted}, ::Integer) at /opt/julia/usr/share/julia/stdlib/v1.6/LinearAlgebra/src/qr.jl:523
  size(::Union{LinearAlgebra.Cholesky, LinearAlgebra.CholeskyPivoted}) at /opt/julia/usr/share/julia/stdlib/v1.6/LinearAlgebra/src/cholesky.jl:442
  ...
Stacktrace:
  [1] axes
    @ ./abstractarray.jl:89 [inlined]
  [2] combine_axes(::Compose.Property{Compose.FillPrimitive}, ::Compose.Property{Compose.FillPrimitive}, ::Compose.Property{Compose.FillPrimitive})
    @ Base.Broadcast ./broadcast.jl:483
  [3] shape(x::AlgebraOfGraphics.Layer)
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/processing.jl:17
  [4] getlabeledarray(layer::AlgebraOfGraphics.Layer, s::Symbol)
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/processing.jl:72
  [5] (::AlgebraOfGraphics.var"#119#121"{Tuple{Symbol, Symbol}, AlgebraOfGraphics.Layer, Dict{Union{Int64, Symbol}, Any}})(key::Int64)
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/processing.jl:100
  [6] ntuple
    @ ./ntuple.jl:19 [inlined]
  [7] mapkeys
    @ ~/.julia/packages/AlgebraOfGraphics/4qspg/src/entries.jl:75 [inlined]
  [8] (::AlgebraOfGraphics.var"#118#120"{AlgebraOfGraphics.Layer, Dict{Union{Int64, Symbol}, Any}})(tup::Tuple{Symbol, Symbol})
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/processing.jl:99
  [9] map
    @ ./tuple.jl:214 [inlined]
 [10] process_mappings(layer::AlgebraOfGraphics.Layer)
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/processing.jl:98
 [11] to_entry(layer::AlgebraOfGraphics.Layer)
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/processing.jl:115
 [12] process(layer::AlgebraOfGraphics.Layer)
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/processing.jl:122
 [13] iterate
    @ ./generator.jl:47 [inlined]
 [14] collect(itr::Base.Generator{AlgebraOfGraphics.Layers, typeof(AlgebraOfGraphics.process)})
    @ Base ./array.jl:678
 [15] map
    @ ./abstractarray.jl:2323 [inlined]
 [16] compute_axes_grid(fig::Figure, s::AlgebraOfGraphics.Layer; axis::NamedTuple{(), Tuple{}}, palettes::NamedTuple{(), Tuple{}})
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/layers.jl:70
 [17] plot!(fig::Figure, s::AlgebraOfGraphics.Layer; axis::NamedTuple{(), Tuple{}}, palettes::NamedTuple{(), Tuple{}})
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/layers.jl:135
 [18] #plot#91
    @ ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/layers.jl:143 [inlined]
 [19] draw(s::AlgebraOfGraphics.Layer; axis::NamedTuple{(), Tuple{}}, figure::NamedTuple{(), Tuple{}}, palettes::NamedTuple{(), Tuple{}})
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/layers.jl:150
 [20] draw(s::AlgebraOfGraphics.Layer)
    @ AlgebraOfGraphics ~/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/layers.jl:150
 [21] top-level scope
    @ REPL[14]:1

I checked that the following returns the same before and after using Gadfly:

julia> typeof(iris_frequency)
AlgebraOfGraphics.Layer

help?> AoG.draw
  No documentation found.

  AlgebraOfGraphics.draw is a Function.

  # 1 method for generic function "draw":
  [1] draw(s::Union{AlgebraOfGraphics.Layer, AlgebraOfGraphics.Layers}; axis, figure, palettes) in AlgebraOfGraphics at /home/me/.julia/packages/AlgebraOfGraphics/4qspg/src/algebra/layers.jl:148

(juliaplotting) pkg> status
      Status `~/Repos/juliaplotting/Project.toml`
  [cbdf2221] AlgebraOfGraphics v0.4.5
  [13f3f980] CairoMakie v0.5.10
  ...
  [c91e804a] Gadfly v1.3.3
  ...
  [ce6b1742] RDatasets v0.7.5

[knuesel]

This is caused by

Compose.jl/src/property.jl

Line 71 in da671cd

fill(c::Nothing) = Fill([FillPrimitive(RGBA{Float64}(0.0, 0.0, 0.0, 0.0))])

which commits type piracy (see linked issue for details).

[jonasjonker]

Thanks, for figuring that out! I couldn't find it but now it makes sense.