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refactor: Optimized for incremental calculation

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Toh4iem9
2025-12-17 12:51:54 +01:00
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Indicators/MyIndicators/Authors/Kaufman/PVI_NVI_Pro.md
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# Positive/Negative Volume Index (PVI/NVI) Professional
# Positive/Negative Volume Index (PVI/NVI) Pro
## 1. Summary (Introduction)
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## 3. MQL5 Implementation Details
* **Modular Calculation Engine (`PVI_NVI_Calculator.mqh`):** All mathematical logic is encapsulated in a dedicated include file. The calculator uses a full recalculation loop to ensure the cumulative lines are always accurate.
* **Modular Calculation Engine (`PVI_NVI_Calculator.mqh`):** All mathematical logic is encapsulated in a dedicated include file.
* **Optimized Incremental Calculation:**
Unlike basic implementations that recalculate the entire history on every tick, this indicator employs an intelligent incremental algorithm.
* It utilizes the `prev_calculated` state to determine the exact starting point for updates.
* **Persistent State:** The internal buffers (`pvi_buffer`, `nvi_buffer`) persist their state between ticks. This allows the cumulative calculation to continue seamlessly from the last known value without re-processing the entire history.
* This results in **O(1) complexity** per tick, ensuring instant updates and zero lag.
* **Display Mode for Clarity:** Because the PVI and NVI lines can diverge significantly over time, compressing the vertical scale, the indicator includes a `Display Mode` input. This allows the user to focus on either the PVI or the NVI individually, which automatically adjusts the chart scale for optimal visibility.
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## 4. Parameters
* **Display Mode (`InpDisplayMode`):** Allows the user to show only the PVI, only the NVI, or both. Default is `DISPLAY_NVI_ONLY` for focusing on the "smart money" signal.
* **Display Mode (`InpDisplayMode`):** Allows the user to show only the PVI or only the NVI. Default is `DISPLAY_NVI_ONLY` for focusing on the "smart money" signal.
* **Signal Period (`InpSignalPeriod`):** The period for the long-term moving average applied to both lines. The traditional value is `255`.
* **Signal MA Type (`InpSignalMAType`):** The type of moving average for the signal lines.
* **Volume Type (`InpVolumeType`):** The volume source for the calculation.