Here's a trend strength filter with directional bias built-in which I converted from MT4 to MT5. Source code for MT4 is at mql5.com. Credit to the original MT4 coder is the unchanged indicator name. Combining chart window indicator calls with subwindow indicator calls created some strange code conflicts, so the additional indicators below are required as well. All files must be copied into your MQL5\Indicators folder.

Slope indicates trend strength, and histogram colors indicate price direction. Light colors indicate counter trend resistance.