This indicator is a filter of trend based on certain calculation functions.

Manual

This indicator is composed of two curves:

• The red curve follows the trend of the bearish trend, the green curve follows the trend of the uptrend.
• It is sufficient to observe the trend of these two curves, their relative positions and their sign (positive or negative).

Parameter

• NPIdPeriod: The only parameter NPIdPeriod represents the number of bars on which are needed to calculate the variation of these two values

It can be adjusted as you like to see all variations, but the recommended value is 34.

FV-Filter-Trend composes a very good combination with my indicator Daily-Rang-Trend https://www.mql5.com/en/market/product/18134