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Williams Fractals [Tutorial/Template]

I noticed there weren't any code templates for Williams Fractals, therefore I have written this script to be a template and tutorial for those learning Pine Script. Each line is commented to show what it does.

If you don't know what Williams Fractals are, here is a brief explanation.

Bill Williams Fractals is a lagging indicator used to plot trend reversals on a chart. These appear over a candle at the point of reversal 2 candles after it has occurred. Often times this indicator is used in strategies such as Mumbai Scalping and paired with trend direction indicators and trailing stop indicators such as Parabolic SAR and SuperTrend.
开源脚本

本着真正的TradingView精神,该脚本的作者将其开源发布,以便交易者可以理解和验证它。为作者喝彩!您可以免费使用它,但在出版物中重复使用此代码受网站规则的约束。 您可以收藏它以在图表上使用。

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// Bill Williams Fractal Template
// Coded By: Matthew Spencer
// If you like this script or use it's code in one of yours, please donate.
// PayPal: ma.spencer@gmx.com Bitcoin: 1foxypuyuoNp5n1LNCCCCmjZ4RAXntQ8X

// Define our title and that this script will overlay the candles.
study("Williams Fractals",shorttitle="Fractals", overlay=true)

// Define "n" as the number of periods and keep a minimum value of 2 for error handling.
n = input(title="Periods", defval=2, minval=2, type=integer)

// Williams Fractals are a 5 point lagging indicator that will draw 2 candles behind.
// The purpose of the indicator is to plot points of trend reversals.
// Often these are paired with trailing stop indicators such as Parabolic SAR, Volatility Stop, and SuperTrend.

// Down pointing fractals occur over candles when:
//   High(n-2) < High(n)
//   High(n-1) < High(n)
//   High(n + 1) < High(n)
//   High(n + 2) < High(n)
dnFractal = (high[n-2] < high[n]) and (high[n-1] < high[n]) and (high[n+1] < high[n]) and (high[n+2] < high[n])

// Up pointing fractals occur under candles when:
//   Low(n-2) > Low(n) 
//   Low(n-1) > Low(n)
//   Low(n + 1) > Low(n) 
//   Low(n + 2) > Low(n)
upFractal = (low[n-2] > low[n]) and (low[n-1] > low[n]) and (low[n+1] > low[n]) and (low[n+2] > low[n])

// Plot the fractals as shapes on the chart.
plotshape(dnFractal, style=shape.arrowdown, location=location.abovebar, offset=-2, color=olive, transp=0) // Down Arrow above candles
plotshape(upFractal, style=shape.arrowup, location=location.belowbar, offset=-2, color=maroon, transp=0)  // Up Arrow below candles