How to correctly pick the index of heatmap cell?

vladdez · April 19, 2024, 10:38am

My goal is to click the cell in heatmap and got its index.

Currently it is implemented the following way

on(events(f).mousebutton, priority = 2) do event
        if event.button == Mouse.left && event.action == Mouse.press
            i = 0
            _, i = pick(ax.scene)
            i = i - size(m, 1) - 2
        end
    end

And indexing is done by pick() and it is implemented weirdly:

Do you know how to change it so it will take one color cell as an index, not half of one and half of another cells?

It seems it somehow related with tick position

jules · April 19, 2024, 10:47am

The indices are related to the vertices of the primitives used to render, some kind of mesh I guess. Have a look at how DataInspector converts this information, maybe it helps Makie.jl/src/interaction/inspector.jl at f51eb527806e184690b577e17e630e9c9c521cb9 · MakieOrg/Makie.jl · GitHub

vladdez · April 19, 2024, 11:28am

This worked!

  on(events(f).mousebutton, priority = 1) do event
        if event.button == Mouse.left && event.action == Mouse.press
            i = 0
            plot, i = pick(ax.scene)
            a = DataInspector(plot)
            pos = Makie.position_on_plot(plot, -1, apply_transform = false)[Vec(1, 2)]
            b = Makie._pixelated_getindex(plot[1][], plot[2][], plot[3][], pos, true)
            chan_i[] = b[1]
            var_i[] = b[2]
            println(chan_i[], ' ', var_i[])
        end
    end
    f