This ProBuilder code snippet is designed to identify and draw support lines between two historical low points on a price chart that occur at the same price level. The code is particularly useful in markets where price values are integers, such as the Micro DAX Full, increasing the likelihood of repeated low values.

defparam drawonlastbaronly=true
lookback = 200
if islastbarupdate then
    for i = lookback-1 downto 0 do
        pointA=low[i]
        pointAbar=barindex[i]
        for j = i-1 downto 0 do
            pointB=low[j]
            pointBbar=barindex[j]
            period = max(1,barindex-pointAbar)
            if pointA=pointB and lowest[period](low)=pointA then
                drawtext("A",pointAbar,pointA)
                drawtext("B",pointBbar,pointB)
                drawray(pointAbar,pointA,pointBbar,pointB)
            endif
        next
    next
endif
return

This code snippet performs the following steps:

• Initialization: It sets the parameter to draw only on the last bar of the chart for performance optimization.
• Lookback Period: Defines a lookback period of 200 bars to search for low points.
• Outer Loop: Iterates through each bar within the lookback period to identify a low point (pointA) and its corresponding bar index (pointAbar).
• Inner Loop: For each identified pointA, the code searches for another low point (pointB) before pointA within the lookback period that matches the price of pointA.
• Condition Check: If pointA and pointB are at the same price and this price is the lowest within the period between them, the code proceeds to draw.
• Drawing on Chart: Marks the points A and B on the chart, and draws a ray (line) connecting these two points, visually representing the support line.

This approach is useful for traders and analysts looking to visually identify price levels where the market has shown historical support, potentially indicating areas of interest for future trading decisions.