GLMakie: Legend for figures with two y-axis

General Usage
,
1

Hi!
I spent some time in the net but a failed to find a suitable solution.
In the forum I found the helpful topic:
https://discourse.julialang.org/t/solved-plotting-2-plots-on-same-figure-with-dual-axis/124623

But the question is still not solved:
How to specify a legend if a figure contains two y-axis.
Example:
Given are: Xvec, VectorDistValues, VectorCurrent, VectorPrivious

    fig = Figure()
    ax1 = Axis(fig[1, 1], yticklabelcolor = :blue, xlabel = "n Iterations / -", ylabel = "Cycle Counter / -")
    ax2 = Axis(fig[1, 1], yticklabelcolor = :red, yaxisposition = :right, ylabel = "Distance / -")
    
    hln1 = lines!(ax1, Xvec, VectorDistValues, label= "Distance / -")
    hln2 = lines!(ax2, Xvec, VectorCurrent,  color = :red, label= "Current")
    hln3 = lines!(ax2, Xvec, VectorPrivious, color = :orange, label= "Privious")

I know that the following works fine:

    Legend(fig[1, 2],
       [hln1, hln2, hln3],
       ["Distance / -", "Current", "Privious"],)

But I wonder if I can use the line-labels already specified in the line-definitions.
Something similar like the following (which works only for figures whith one y-axis):

    Legend(fig[1, 2], ax1)

Any ideas?

2

You want Add possibility to collect legend entries from multiple axes by jusack · Pull Request #5500 · MakieOrg/Makie.jl · GitHub

2 Likes
3

Cool! :slight_smile:
Thanks! - Is it already merged into main?

4

No, green means it’s still open

5

@jules
Proposal: What about an automatism: if there is a vector of axis handles join the legends of the axes?

6

Better to comment on the PR if you have specific suggestions about the implementation

7

@jules
I was informed that something have been accepted and that code have been merged.
Thanks for your initiative!
What are now the next steps? Currently I do not yet see a change in the functionality of the Legend() function.

8

The PR is merged into the main branch of the Makie.jl repo (see the changelog), but is not released yet. It looks like the changes from the PR #5551 will be released in Makie 0.24.10. In the meantime I think you can use the unreleased changes by doing

using Pkg
Pkg.add(url="https://github.com/MakieOrg/Makie.jl", rev="master")
1 Like
9

Better is:
]add ComputePipeline#master Makie#master GLMakie#master
Since otherwise you may get some weird compat issues. ComputePipeline/Makie and the backends are developped in lockstep, and just adding Makie#master basically disables that :wink:

2 Likes