Area

using PlotlyJS

function area1()
    trace1 = scatter(;x=1:4, y=[0, 2, 3, 5], fill="tozeroy")
    trace2 = scatter(;x=1:4, y=[3, 5, 1, 7], fill="tonexty")
    plot([trace1, trace2])
end
area1()

function area2()
    function _stacked_area!(traces)
        for (i, tr) in enumerate(traces[2:end])
            for j in 1:min(length(traces[i]["y"]), length(tr["y"]))
                tr["y"][j] += traces[i]["y"][j]
            end
        end
        traces
    end

    traces = [scatter(;x=1:3, y=[2, 1, 4], fill="tozeroy"),
              scatter(;x=1:3, y=[1, 1, 2], fill="tonexty"),
              scatter(;x=1:3, y=[3, 0, 2], fill="tonexty")]
    _stacked_area!(traces)

    plot(traces, Layout(title="stacked and filled line chart"))
end
area2()

function area3()
    trace1 = scatter(;x=1:4, y=[0, 2, 3, 5], fill="tozeroy", mode="none")
    trace2 = scatter(;x=1:4, y=[3, 5, 1, 7], fill="tonexty", mode="none")
    plot([trace1, trace2],
         Layout(title="Overlaid Chart Without Boundary Lines"))
end
area3()