This code snippet demonstrates how to calculate the SuperTrend indicator using Heikin Ashi candlestick values in ProBuilder. The SuperTrend is a popular trading indicator that combines price momentum and volatility to determine potential market trends. Heikin Ashi candles are used here to smooth price data and reduce noise, enhancing the effectiveness of the SuperTrend indicator.

ONCE xOpen = open
xClose = (open + high + low + close) / 4
IF BarIndex > 1 THEN
    xOpen = (xOpen[1] + xClose[1]) / 2
ENDIF
xLow = min(low,min(xClose,xOpen))
xHigh = max(high,max(xClose,xOpen))
MedianHA = (xHigh + xLow) / 2
// 
IF BarIndex > Max(Periods,Multiplier) THEN
    MyATR = AverageTrueRange[Periods](xClose) * Multiplier
    BasicUPPER = MedianHA + MyATR
    BasicLOWER = MedianHA - MyATR
    IF (BasicUPPER < FinalUPPER[1]) OR (xClose[1] > FinalUPPER[1]) THEN
        FinalUPPER = BasicUPPER
    ENDIF
    IF (BasicLOWER > FinalLOWER[1]) OR (xClose[1] < FinalLOWER[1]) THEN
        FinalLOWER = BasicLOWER
    ENDIF
    IF (ST[1] = FinalUPPER[1]) AND (xClose <= FinalUPPER) THEN
        ST = FinalUPPER
    ELSE IF (ST[1] = FinalUPPER[1]) AND (xClose > FinalUPPER) THEN
        ST = FinalLOWER
    ELSE IF (ST[1] = FinalLOWER[1]) AND (xClose >= FinalLOWER) THEN
        ST = FinalLOWER
    ELSE IF (ST[1] = FinalLOWER[1]) AND (xClose < FinalLOWER) THEN
        ST = FinalUPPER
    ENDIF
ENDIF
ENDIF
ENDIF
ENDIF
ENDIF
RETURN ST AS "Super Trend HA"

Explanation of the code:

• Initialization: The Heikin Ashi open (xOpen) and close (xClose) prices are calculated. The xClose is the average of the open, high, low, and close prices of the current bar.
• Heikin Ashi Values: For subsequent bars, xOpen is recalculated as the average of the previous bar's xOpen and xClose. xLow and xHigh are determined as the minimum and maximum values among the low, xClose, and xOpen, and the high, xClose, and xOpen, respectively.
• Median Calculation: MedianHA is calculated as the average of xHigh and xLow.
• SuperTrend Calculation: The Average True Range (ATR) is calculated based on the xClose and adjusted by a multiplier. The basic upper and lower SuperTrend values are then computed by adding and subtracting the ATR from MedianHA.
• Trend Determination: The final upper and lower SuperTrend values are adjusted based on previous values and the current xClose. The SuperTrend (ST) is then determined based on the previous trend and the current xClose position relative to the SuperTrend values.

This approach helps in smoothing the price data and potentially provides a clearer indication of the trend direction, which can be beneficial in various trading strategies.