Real author:
RickD
The i-HighLow indicator draws a channel with the borders that correspond to the highest and lowest values of candlestick shadows for a specified number of bars with a vertical shift at the number of points defined by the indicator input parameters:
//+----------------------------------------------+ //| Indicator input parameters                 | //+----------------------------------------------+ input uint period=20;   // The number of candlesticks for defining an extremum input uint Filter=50;   // Width of the offset from a candlestick in points input int Shift=0;      // Horizontal shift of the indicator in bars
This indicator was first implemented in MQL4 and published in CodeBase on 21.05.2007.
Figure 1. The i-HighLow indicator