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Expanding top or bottom

An indicator of patterns #1 and #4 ("Broadening Tops" and "Broadening Bottoms") from Encyclopedia of Chart Patterns by Thomas N. Bulkowski.  

Version 1: bottom, top, bottom, top, top breakout. Version 2: top, bottom, top, bottom, top breakout.


  • Alerts - show alert when an arrow appears  
  • Push - send a push notification when an arrow appears (requires configuration in the terminal)
  • Variant1 - show version 1 of the pattern
  • Variant2 - show version 2 of the pattern
  • PeriodBars - indicator period
  • K - an additional parameter that influences the accuracy of pattern shape recognition. The smaller the value is, the smoother the row of peaks/valleys should be, so fewer patterns will be recognized
  • ArrowType - a symbol from 1 to 17
  • ArrowVShift - vertical shift of arrows in points  
  • ShowLevels - show levels
  • ColUp - color of arrow up
  • СolDn - color of arrow down  
  • Auto5Digits - automatic multiplication of ArrowVShift by 10 when working with 5 and 3 digit quotes.

Note. Arrows appear on a forming bar and do not disappear.

It cannot be guaranteed that the indicator recognizes the patterns exactly as implied by the author.

Recommended optimization parameters: PeriodBars, K.  

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