Allow scalar number colors for legend entries

[jkrumbiegel]

Description

Fixes #3551, #3532, #1905,

Picks up colormap and colorrange settings from plot objects so that a number color does not error anymore when passed down to the plotting primitives of the legend entries.

f = Figure()
ax = Axis(f[1, 1])
for i in 1:3
    lines!(ax, (1:3) .+ i, color = i, colorrange = (0, 4), colormap = :Blues, label = "Line $i", linewidth = 3)
end
for i in 1:3
    scatter!(ax, (1:3) .+ i .+ 3, color = i, colorrange = (0, 4), colormap = :plasma, label = "Scatter $i", markersize = 15)
end
for i in 1:3
    barplot!(ax, (1:3) .+ i .+ 8, fillto = (1:3) .+ i .+ 7.5, color = i, colorrange = (0, 4), colormap = :tab10, label = "Barplot $i")
end
for i in 1:3
    poly!(ax, [Rect2f((j, i .+ 12 + j), (0.5, 0.5)) for j in 1:3], color = i, colorrange = (0, 4), colormap = :heat, label = "Poly $i")
end
Legend(f[1, 2], ax)
f

Type of change

Delete options that do not apply:

• New feature (non-breaking change which adds functionality)

Checklist

• Added an entry in NEWS.md (for new features and breaking changes)
• Added reference image tests for new plotting functions, recipes, visual options, etc.

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt. All benchmark results are based on the mean time and negative percent mean faster than the base branch. Note, that GLMakie + WGLMakie run on an emulated GPU, so the runtime benchmark is much slower. Results are from running:

using_time = @ctime using Backend
# Compile time
create_time = @ctime fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @ctime Makie.colorbuffer(display(fig))
# Runtime
create_time = @benchmark fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @benchmark Makie.colorbuffer(fig)

	using	create	display	create	display
GLMakie	3.47s (3.45, 3.53) 0.03+-	391.56ms (381.01, 399.42) 6.02+-	470.51ms (465.99, 477.89) 4.74+-	7.36ms (7.27, 7.43) 0.06+-	25.54ms (25.45, 25.73) 0.10+-
master	3.46s (3.43, 3.52) 0.03+-	396.12ms (386.65, 408.16) 10.18+-	474.65ms (464.88, 514.12) 17.52+-	7.26ms (7.20, 7.33) 0.05+-	25.42ms (25.37, 25.50) 0.04+-
evaluation	1.00x invariant, 0.01s (0.27d, 0.62p, 0.03std)	1.01x invariant, -4.56ms (-0.55d, 0.33p, 8.10std)	1.01x invariant, -4.14ms (-0.32d, 0.57p, 11.13std)	0.99x slower X, 0.09ms (1.72d, 0.01p, 0.05std)	1.00x slower X, 0.11ms (1.53d, 0.02p, 0.07std)
CairoMakie	3.07s (3.00, 3.14) 0.05+-	326.95ms (313.59, 366.12) 18.14+-	141.78ms (137.83, 151.82) 4.80+-	7.33ms (7.14, 7.48) 0.13+-	603.99μs (598.96, 610.54) 4.90+-
master	3.07s (3.02, 3.14) 0.04+-	325.98ms (318.06, 340.33) 8.04+-	142.21ms (138.95, 148.26) 3.28+-	7.39ms (7.11, 7.66) 0.22+-	608.00μs (598.44, 616.91) 5.91+-
evaluation	1.00x invariant, -0.01s (-0.12d, 0.82p, 0.04std)	1.00x invariant, 0.97ms (0.07d, 0.90p, 13.09std)	1.00x invariant, -0.43ms (-0.11d, 0.85p, 4.04std)	1.01x invariant, -0.06ms (-0.35d, 0.53p, 0.17std)	1.01x invariant, -4.01μs (-0.74d, 0.19p, 5.40std)
WGLMakie	3.73s (3.69, 3.78) 0.03+-	321.33ms (316.87, 324.09) 2.52+-	8.90s (8.80, 8.96) 0.05+-	9.25ms (9.16, 9.41) 0.09+-	73.63ms (67.36, 85.45) 7.10+-
master	3.71s (3.69, 3.75) 0.02+-	325.43ms (318.22, 339.40) 8.32+-	8.86s (8.81, 8.89) 0.03+-	9.28ms (9.06, 9.77) 0.23+-	73.55ms (68.66, 81.59) 5.48+-
evaluation	0.99x invariant, 0.02s (0.82d, 0.15p, 0.03std)	1.01x invariant, -4.1ms (-0.67d, 0.25p, 5.42std)	1.00x invariant, 0.04s (0.93d, 0.11p, 0.04std)	1.00x invariant, -0.03ms (-0.17d, 0.76p, 0.16std)	1.00x invariant, 0.07ms (0.01d, 0.98p, 6.29std)