The Envelopes indicator with the use of the i-CAi indicator algorithm.
The indicator uses SmoothAlgorithms.mqh library classes (copy it to <terminal_data_folder>\MQL5\Include). The use of the classes was thoroughly described in the article "Averaging Price Series for Intermediate Calculations Without Using Additional Buffers".
Fig.1. The i-CAiChannel indicator
Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/16003
The i-CAi indicator displays the most recent value as a price label with the the possibility to round the channel levels up to a required number of digits.SMI_Correct_HTF
The SMI_Correct indicator with the timeframe selection option available in input parameters.