Hann Window FIR Filter Ribbon [BigBeluga]

🔵 OVERVIEW
The Hann Window FIR Filter Ribbon [BigBeluga] is a trend-following visualization tool based on a family of FIR filters using the Hann window function. It plots a smooth and dynamic ribbon formed by six Hann filters of progressively increasing length. Gradient coloring and filled bands reveal trend direction and compression/expansion behavior. When short-term trend shifts occur (via filter crossover), it automatically anchors visual support/resistance zones at the nearest swing highs or lows.

🔵 CONCEPTS

• Hann FIR Filter: A finite impulse response filter that uses a Hann (cosine-based) window for weighting past price values, resulting in a non-lag, ultra-smooth output.
  

  hannFilter(length)=>
      var float hann = na  // Final filter output
      float filt = 0
      float coef = 0
  
      for i = 1 to length
          weight = 1 - math.cos(2 * math.pi * i / (length + 1))  
          filt += price[i - 1] * weight
          coef += weight
  
      hann := coef != 0 ? filt / coef : na

• Ribbon Stack: The indicator plots 6 Hann FIR filters with increasing lengths, creating a smooth "ribbon" that adapts to price shifts and visually encodes volatility.
  
• Gradient Coloring: Line colors and fill opacity between layers are dynamically adjusted based on the distance between the filters, showing momentum expansion or contraction.
  
• Dynamic Swing Zones: When the shortest filter crosses its nearest neighbor, a swing high/low is located, and a triangle-style level is anchored and projected to the right.
  
• Self-Extending Levels: These dynamic levels persist and extend until invalidated or replaced by a new opposite trend break.
  

🔵 FEATURES

• Plots 6 Hann FIR filters with increasing lengths (controlled by Ribbon Size input).
  
• Automatically colors each filter and the fill between them with smooth gradient transitions.
  
• Detects trend shifts via filter crossover and anchors visual resistance (red) or support (green) zones.
  
• Support/resistance zones are triangle-style bands built around recent swing highs/lows.
  
• Levels auto-extend right and adapt in real time until invalidated by price action.
  
• Ribbon responds smoothly to price and shows contraction or expansion behavior clearly.
  
• No lag in crossover detection thanks to FIR architecture.
  
• Adjustable sensitivity via Length and Ribbon Size inputs.
  

🔵 HOW TO USE

• Use the ribbon gradient as a visual trend strength and smooth direction cue.
  
• Watch for crossover of shortest filters as early trend change signals.
  
• Monitor support/resistance zones as potential high-probability reaction points.
  
• Combine with other tools like momentum or volume to confirm trend breaks.
  
• Adjust ribbon thickness and length to suit your trading timeframe and volatility preference.
  

🔵 CONCLUSION
Hann Window FIR Filter Ribbon [BigBeluga] blends digital signal processing with trading logic to deliver a visually refined, non-lagging trend tool. The adaptive ribbon offers insight into momentum compression and release, while swing-based levels give structure to potential reversals. Ideal for traders who seek smooth trend detection with intelligent, auto-adaptive zone plotting.