Simple HV

Settings=
{
    Name = "HV Example",
    period = 8,
    line =
    {
        {
            Name = "HV",
            Color = RGB(255, 0, 0),
            Type = TYPE_LINE,
            Width = 2
        }
    }
}

function Init()
    return 1
end

function OnCalculate(index)
    if index < Settings.period then
        return nil
    else
        local start_index = index - Settings.period + 1

        local high = H(start_index)
        local low = L(start_index)
        local open = O(start_index)

        for i = start_index, index do
            if H(i) > high then
                high = H(i)
            end
            if L(i) < low then
                low = L(i)
            end
        end

        return (high - low) / open * 16
    end
end