This code snippet demonstrates how to identify and visually represent swing highs and swing lows in a trading chart using the ProBuilder programming language. These indicators are useful for traders to understand potential reversal points in the market.

xPeriod = 20
If High[1] = Highest[xPeriod](High) and High[2] < High[1] and High < High[1] then
    SwingHigh = High[1]
    DrawArrowUP(BarIndex-1,High[1]+10) Coloured(0,255,0)
    DrawText("#SwingHigh#", BarIndex-1, High[1]+30,Dialog,Bold,15) Coloured(0,255,0)
EndIf
If Low[1] = Lowest[xPeriod](Low) and Low[2] > Low[1] and Low > Low[1] then
    SwingLow = Low[1]
    DrawArrowDown(BarIndex-1,Low[1]-10) Coloured(255,0,0)
    DrawText("#SwingLow#", BarIndex-1, Low[1]-30,Dialog,Bold,15) Coloured(255,0,0)
EndIf
Return

The code snippet above is structured to detect and mark swing highs and swing lows based on the price movements over a specified period. Here’s a step-by-step explanation:

• Setting the Period: The variable xPeriod is set to 20, which defines the number of bars (or periods) to look back to find the highest high and the lowest low.
• Identifying Swing High: The condition checks if the high of the previous bar (High[1]) equals the highest high of the last 20 bars (Highest[xPeriod](High)) and if it is greater than the highs of the bars immediately before and after it. If true, it marks this as a swing high.
• Visual Representation for Swing High: If a swing high is identified, a green upward arrow is drawn at the bar, slightly above the high price. Additionally, the text “#SwingHigh#” is displayed above the arrow.
• Identifying Swing Low: Similarly, the code checks for the lowest low in the same manner as the swing high but in the opposite direction. It ensures the low of the previous bar (Low[1]) is the lowest of the past 20 bars and is lower than the lows of the bars immediately before and after it.
• Visual Representation for Swing Low: For swing lows, a red downward arrow is drawn at the bar, slightly below the low price. The text “#SwingLow#” is displayed below the arrow.

This implementation can be particularly useful for traders looking to automate the detection of potential pivot points in price charts, aiding in decision-making processes related to entries and exits in trades.