Market Pivot Levels [Past & Live]

Market Levels provide a robust view of daily pivot points of markets such as high/low/close with both past and live values shown at the same time using the recently updated system of polylines of pinescript.

The main need for this script arose from not being able to use plots for daily points because plots are inherently once drawn can't be erased and because we can't plot stuff for previous bars after values are determined we can't use them reliably. And while we can use traditional lines, because we would have extremely high amount of lines and we would have to keep removing the previous ones it wouldn't be that effective way for us. So we try to do it with the new method of polylines.

Features of this script:
- Daily High/Low Points
- Yesterday High/Low/Close Points
- Pre-Market High-Low points.

Now let's preview some of the important points of code and see how we achieve this:

With the code below we make sure no matter which chart we are using we are getting the extended hours version of sessions so our calculations are made safely for viewing pre-market conditions.

// Let's get ticker extended no matter what the current chart is
tc = ticker.new(syminfo.prefix, syminfo.ticker, session.extended)

Coding our own function to calculate high's and low's because inbuilt pinescript function cannot take series and we send this function to retrieve our high's and lows.

// On the fly function to calculate daily highlows instead of tv inbuilt because tv's length cannot take series
f_highlow(int last) =>
    bardiff = last
    float _low = low, float _high = high
    for i = bardiff to 0 by 1
        if high > _high
            _high := high
        if low < _low
            _low := low
    [_high, _low, close]

With doing calculations at the bars of day ending points we can retrieve the correct points and values and push them for our polylines array so it can be used in best way possible.

// Daily change points
changeD = timeframe.change("D")

// When new day starts fill polyline arrays with previous day values for polylines to draw on chart
// We also update prevtime values with current ones after we pushed to the arrays
if changeD
    f_arrFill(cpArrHigh, cpArrLow, prevArrh, prevArrl, prevArrc, prevMarh, prevMarl)
    valHolder.unshift(valueHold.new(_high, _low, _high, _close, _low, time, pr_h, pr_l))

The rest of the code is annotated and commented. You can let me know in comments if you have any questions. Happy trading.