This code snippet demonstrates how to detect flat lines in the Kijun and Senkou Span B indicators, which are part of the Ichimoku Kinko Hyo system, using the ProBuilder programming language. The code identifies periods where these lines remain relatively unchanged, indicating a flat or stable market condition, and highlights these lines on a chart.

flatPeriod = 5
maxPercent = 0.0001 //percent difference
// ----------
maxPercent = maxPercent / 100

Kijun = (highest[26](high)+lowest[26](low))/2
isKijunFlat = summation[flatPeriod](kijun=kijun[1] or (kijun/kijun[1]<=1+maxPercent and kijun/kijun[1]>=1-maxPercent))=flatPeriod
if isKijunFlat then
  drawhline(kijun) coloured(200,200,0)
endif

SSpanB = (highest[52](high)+lowest[52](low))/2
isSSpanBFlat = summation[flatPeriod](sspanb=sspanb[1] or (sspanb/sspanb[1]<=1+maxPercent and sspanb/sspanb[1]>=1-maxPercent))=flatPeriod
if isSSpanBFlat then
  drawhline(sspanb) coloured(0,200,200)
endif

return

Explanation of the Code:

• Initialization: The variables flatPeriod and maxPercent are set to define the number of periods to check for flatness and the maximum percentage difference between values to still consider the line flat, respectively.
• Calculation of Kijun and SSpanB: The Kijun and Senkou Span B (SSpanB) values are calculated using typical Ichimoku formulas, which involve the highest and lowest prices over specific periods.
• Detection of Flatness: The summation function is used to count how many times in the last flatPeriod periods the value of Kijun or SSpanB has changed within the specified maxPercent. If the count equals flatPeriod, the line is considered flat.
• Conditional Drawing: If a flat line is detected, a horizontal line (drawhline) is drawn at the level of Kijun or SSpanB. The color of the line is set to yellow-orange for Kijun and sky blue for SSpanB, making them visually distinct.

This code is useful for traders or analysts who use technical analysis to understand market stability and potential breakout points.