How to interactively change attributes of plots in GLMakie?

New to Julia
,
1

I’m relatively new to Julia and I’m trying to design a logistics application with GLMakie. Depending on some interactions I want to change the colors and markers on a map. I used Observables but it doesn’t work… What am I doing wrong??

using GLMakie

fig = Figure(backgroundcolor = :lightgrey)
ax = Axis(fig[1, 1] )
limits!(ax, 0, 10, 0, 10)

loc_color = Observable(:black)
loc_mark  = Observable(:circle)
p1 = scatter!(ax, 5, 8, color = loc_color, marker=loc_mark, markersize = 20)

b1 = false
but1 = Button(fig[1,2], tellheight = false)
on(but1.clicks) do n
    if (b1)
        loc_color[] = :red
        loc_mark[]  = :circle
    else
        loc_color[] = :green
        loc_mark[] = :utriangle
    end
    b1 = !b1
 end

fig
2

you need: loc_color[] = new_value, and you don’t need a notify…

3

Thanks, sdanisch,
I was surprised that I didn’t do that but something went wrong in my copy. It was in my code. I removed the notify’s but still it is not working…
I changed the code above as it is in my VScode.

4

I get “global b1 not defined in local scope”.
Try:

using GLMakie

fig = Figure(backgroundcolor = :lightgrey)
ax = Axis(fig[1, 1] )
limits!(ax, 0, 10, 0, 10)

loc_color = Observable(:black)
loc_mark  = Observable(:circle)
p1 = scatter!(ax, 5, 8, color = loc_color, marker=loc_mark, markersize = 20)

global b1 = false
but1 = Makie.Button(fig[1,2], tellheight = false)
on(but1.clicks) do n
    global b1
    if (b1)
        loc_color[] = :red
        loc_mark[]  = :circle
    else
        loc_color[] = :green
        loc_mark[] = :utriangle
    end
    b1 = !b1
end
5

Yet, it works now!
But:… it don’t get it fully why I need the ‘global’ definitions: does that have to do with the scope of the on…end code block?
Thanks!

6

I think the relevant docs for that are here:
docs

7

Thanks! Helpful