Selection rectangle with MakieLayout.jl

selectionrect_makielayout.jl

using Makie
using MakieLayout
using GLFW; GLFW.WindowHint(GLFW.FLOATING, 1)



##
scene, layout = layoutscene()

ax = layout[1, 1] = LAxis(scene)

heatmap!(ax, randn(500, 500))
tightlimits!(ax)

start_pos = Ref(Point2f0(0, 0))
current_pos = Ref(Point2f0(0, 0))
rectnode = Node(BBox(0, 10, 0, 10))
rectplot = Ref{Union{Nothing, Poly}}(poly!(ax, rectnode, color = (:blue, 0.05), strokecolor = (:blue, 0.5),
    strokewidth = 2,xautolimits = false, yautolimits = false, visible = false))


scenestate = MakieLayout.addmousestate!(ax.scene)

MakieLayout.onmouseleftdragstart(scenestate) do state
    start_pos[] = state.pos
end

MakieLayout.onmouseleftdrag(scenestate) do state
    
    current_pos[] = state.pos
    c = current_pos[]
    s = start_pos[]

    rectnode[] = let
        minx, miny = min.(s, c)
        maxx, maxy = max.(s, c)
        
        BBox(minx, maxx, miny, maxy)
    end
    rectplot[].visible = true
end

MakieLayout.onmouseleftdragstop(scenestate) do state

    rectplot[].visible = false
    ax.limits[] = rectnode[]
end

scene