Allow Cycled colors to be passed with transparency like normal colors

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Fixed an issue where CairoMakie would unnecessarily rasterize polygons [#3605](https://github.com/MakieOrg/Makie.jl/pull/3605).
 - Added `PointBased` conversion trait to `scatterlines` recipe [#3603](https://github.com/MakieOrg/Makie.jl/pull/3603).
+- Allowed Cycled colors to be passed with transparency as `(Cycled(n::Int), 0.4)` [#3611](https://github.com/MakieOrg/Makie.jl/pull/3611).
 
 ## [0.20.7] - 2024-02-04
 

src/makielayout/blocks/axis.jl

@@ -697,6 +697,10 @@ function to_color(scene::Scene, attribute_name, cycled::Cycled)
     return attr_palette[mod1(index, length(attr_palette))]
 end
 
+function to_color(scene::Scene, attribute_name, cycled::Tuple{<: Cycled, <: Real})
+    return Colors.alphacolor(to_color(scene, attribute_name, cycled[1]), cycled[2])
+end
+
 function add_cycle_attributes!(@nospecialize(plot), cycle::Cycle, cycler::Cycler, palette::Attributes)
     # check if none of the cycled attributes of this plot
     # were passed manually, because we don't use the cycler