Tick Volume Indicator from the book "Momentum, Direction, and Divergence" by William Blau, implemented in the form of a color histogram.
The indicator uses SmoothAlgorithms.mqh library classes (must be copied to the 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".
Figure 1. The BlauTVI indicator
Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/11437
Moving average of ranges. The calculation is based on the price high and low for a period.GFilter
A Moving Average that includes price series processing by Gaussian filter.