Vietnamese: Swing Low Detection with SMA Bands & Background

This script detects **swing lows** using a dynamic SMA-based logic and visually highlights them on the chart.

Features

1. Customizable Moving Averages: Supports multiple MA types (SMA, EMA, WMA, RMA, HMA, DEMA, TEMA, VWMA).
   
2. Swing Low Visualization: Identifies swing lows when price closes below the SMA of lows and exits once price trades above the SMA of highs.
   
3. Smart Rectangles: Marks detected swing lows with labeled boxes for clear visual reference.
   
4. Background Highlights**: Dynamically shades the chart background when price breaks below recent swing lows, helping traders spot potential breakdown zones.
   
5. Configurable Parameters: Period length, rectangle length, and MA source can all be tuned.
   

Use Cases

1. Spot breakdown/bearish continuation signals when price closes under recent lows.
   
2. Combine with higher timeframe trend analysis for confluence.
   

Notes
* This tool is designed for **visual analysis** and is not a standalone buy/sell signal.
* Works best when combined with broader trend analysis, support/resistance levels, and volume.