strokecolor inconsistent behaviour for GLMakie and CairoMakie

[olejorik]

• what version of Makie are you running? (]st -m Makie)

]st -m Makie GLMakie CairoMakie


  [13f3f980] CairoMakie v0.13.1
  [e9467ef8] GLMakie v0.11.2
  [ee78f7c6] Makie v0.22.1

• can you reproduce the bug with a fresh environment ? (]activate --temp; add Makie)
  yes
• What platform + GPU are you on?

julia> versioninfo()
Julia Version 1.11.3
Commit d63adeda50 (2025-01-21 19:42 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 22 × Intel(R) Core(TM) Ultra 7 155H
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, alderlake)
Threads: 1 default, 0 interactive, 1 GC (on 22 virtual cores)

---

When running a slightly modified (to make it visually slightly more interesting) example from Makie documentation, I've noticed that the strokecolor argument as a numerical vector is ignored by CairoMakie.
Here is an MWE

using GLMakie; GLMakie.activate!()
using Makie.GeometryBasics
vertsm = [Point2f.([(sin(π *t), cos(π*t)) .*t^2 .* k for t in -1:0.01:1]) for k in 1:-0.05:0.3];
fig, ax, pl= poly( vertsm, colormap = :blues, strokecolormap=:plasma, strokewidth = 2, color=1:15, strokecolor =1:15, figure= (;size=(300,300))); hidespines!(ax); hidedecorations!(ax);
save("heart_GLMakie.png", fig; px_per_unit=1)
using CairoMakie; CairoMakie.activate!()
fig, ax, pl= poly( vertsm, colormap = :blues, strokecolormap=:plasma, strokewidth = 2, color=1:15, strokecolor =1:15, figure= (;size=(300,300))); hidespines!(ax); hidedecorations!(ax);
save("heart_CairoMakie.png", fig; px_per_unit=1)

And here are the results. The strokecolor argument is ignored by CairoMakie

CairoMakie	GLMakie