Color aesthetic issue with Julia 0.5-rc4?

[Mattriks]

Can anyone replicate this error? I'm using Julia 0.5-rc4, Gadfly 0.4.4, and IJulia 1.3 (note I've used the REPL below for convenience). The error doesn't occur:

• if I output to a PNG file
• in any case, with Julia 0.5-rc3
• in any case, if you leave out the color=id aesthetic from the plot statement.

[tlnagy]

Are you using the masters for Gadfly and Compose?

[tlnagy]

I can reproduce this on 0.5-rc4. Shoot.

[tlnagy]

As far as I'm able to tell, this looks like a bug in Base. Maybe @shashi might know? He has more experience with Compose than me.

[Mattriks]

Yes, using masters. Since the error doesn't occur in 0.5-rc3 (image below), it seems that some change has been made in 0.5-rc4, such that a conflict occurs between Gadfly and Base.

Is it related to those #NULL statements ?

[tlnagy]

Yeah it probably is related to that. Let me see if I can make a minimal example. Kind of hard to post this to base as an issue until we narrow this down a bit.

[tlnagy]

This works on RC4

julia> a = Dict{Type, Nullable{Type}}()
Dict{Type,Nullable{Type}} with 0 entries

julia> a[Int64] = Nullable{Float64}()
Nullable{Float64}()

julia> show(a)
Dict{Type,Nullable{Type}}(Pair{Type,Nullable{Type}}(Int64,#NULL))

[tlnagy]

The error is pointing to dict.jl:71 which was last touched by @vtjnash between RC3 and RC4. The corresponding Compose code hasn't changed in three years. JuliaLang/julia@256a296 looks like it made a lot of changes to printing dicts and might be the culprit here.

[vtjnash]

This might be fixed by JuliaLang/julia#18534, but I don't seem to be able to reproduce right now since I get:

julia> using Gadfly

julia> id = ["a","a","b","b","c"];

julia> p = plot(x=1:5, y=rand(5), color=id, Geom.point); draw(PNG(4inch, 3.3inch), p);
ERROR: UndefVarError: minheight not defined
 in realize_brute_force(::Compose.Table, ::Compose.ParentDrawContext) at /Users/jameson/.julia/v0.6/Compose/src/table.jl:246
 in drawpart(::Compose.Image{Compose.PNGBackend}, ::Compose.Table, ::Compose.IdentityTransform, ::NTuple{4,Float64}, ::Measures.BoundingBox{Tuple{Measures.Length{:mm,Float64},Measures.Length{:mm,Float64}},Tuple{Measures.Length{:mm,Float64},Measures.Length{:mm,Float64}}}) at /Users/jameson/.julia/v0.6/Compose/src/container.jl:472
 in drawpart(::Compose.Image{Compose.PNGBackend}, ::Compose.Context, ::Compose.IdentityTransform, ::NTuple{4,Float64}, ::Measures.BoundingBox{Tuple{Measures.Length{:mm,Float64},Measures.Length{:mm,Float64}},Tuple{Measures.Length{:mm,Float64},Measures.Length{:mm,Float64}}}) at /Users/jameson/.julia/v0.6/Compose/src/container.jl:590 (repeats 2 times)
 in draw(::Compose.Image{Compose.PNGBackend}, ::Compose.Context) at /Users/jameson/.julia/v0.6/Compose/src/container.jl:434
 in draw(::Compose.Image{Compose.PNGBackend}, ::Gadfly.Plot) at /Users/jameson/.julia/v0.6/Gadfly/src/Gadfly.jl:822

[tlnagy]

@vtjnash That's really weird, must be something that has been changed upstream.

[Mattriks]

Just updating that my original issue occurs in Julia 0.5.0 release. Gadfly plots with a color aesthetic don't plot to screen when using a PNG backend (they will plot to file).

[tlnagy]

Paging @vtjnash again, this is a problem. Thanks for checking

[Mattriks]

I've been using Julia-0.6-pre.alpha for a while, and this issue has disappeared. Hope it doesn't reappear in the anticipated 0.6-rc's!

[bjarthur]

if this is no longer a problem in 0.6 we should close this issue.

[Mattriks]

Ok by me. Also #936 is a duplicate of this.