colormap not applied

[RomeoV]

Bug description & steps to reproduce

The colormap kwarg currently doesn't seem to be applied at all.
E.g. after some setup...

versioninfo()  # Julia Version 1.10.4
import Pkg; Pkg.activate(temp=true)
Pkg.add(["GLMakie", "AlgebraOfGraphics"])
using GLMakie, AlgebraOfGraphics
df = (x=rand(100), y=rand(100), z=rand(100))
plt = data(df) * mapping(:x, :y, color=:z)

...then choosing a different colormap with visual(..., colormap=:thermal) should change the colors.

plt * visual(Scatter) |> draw
# vs 
plt * visual(Scatter, colormap=:thermal) |> draw

However, instead they produce the same picture (see below).
This also applies to other colormaps.

Note that with just Makie it works fine, i.e. the pictures are different:

scatter(df.x, df.y, color=df.z)
scatter(df.x, df.y, color=df.z, colormap=:thermal)

Images

Using AlgebraOfGraphics:

fig = Figure();
draw!(fig[1, 1], plt * visual(Scatter), axis=(; title="`colormap=:default`"));
draw!(fig[1, 2], plt * visual(Scatter, colormap=:thermal), axis=(; title="`colormap=:thermal`"));
save("aog.png", fig)

Using just Makie:

fig = Figure();
scatter(fig[1, 1], df.x, df.y, color=df.z, axis=(; title="`colormap=:default`"));
scatter(fig[1, 2], df.x, df.y, color=df.z, colormap=:thermal, axis=(; title="`colormap=:thermal`"));
save("makie.png", fig)

Version info

Please include the output of versioninfo() and Pkg.status() for the environment
where the issue occurred.

julia> versioninfo()
Julia Version 1.10.4
Commit 48d4fd48430 (2024-06-04 10:41 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 16 × 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-15.0.7 (ORCJIT, tigerlake)
Threads: 1 default, 0 interactive, 1 GC (on 16 virtual cores)
Environment:
  JULIA_ERROR_COLOR = red

julia> Pkg.status()
Status `/tmp/jl_jkrCb0/Project.toml`
  [cbdf2221] AlgebraOfGraphics v0.8.3
  [e9467ef8] GLMakie v0.10.7

[RomeoV]

For others running into this issue, I've found that you can work with the colormap by using scales, e.g. as in https://aog.makie.org/dev/layers/draw/#Color.

Probably the example in https://aog.makie.org/dev/gallery/gallery/customization/colorbar/#Colorbar-tweaking needs to be modified, as this is where I got the syntax from in the first place.

[jkrumbiegel]

You do this via scales now so that there's a single point to change for a given color scale. Otherwise things would get confusing if you layer multiple plots that share a color scale, but you modify them separately via visual. The continuous color is shown here https://aog.makie.org/stable/layers/draw/#Color-2