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+# Gann HiLo Activator MTF Pro
+
+## 1. Summary (Introduction)
+
+The `Gann_HiLo_MTF_Pro` is a multi-timeframe (MTF) version of the Gann HiLo Activator. This indicator calculates the trend direction and trailing stop levels on a **higher, user-selected timeframe** and projects them onto the current, lower-timeframe chart.
+
+This allows traders to visualize the major trend and key support/resistance levels from a broader perspective, filtering out the noise of the lower timeframe. The higher-timeframe Gann HiLo acts as a robust dynamic stop-loss and trend filter.
+
+The indicator is highly versatile: if the user selects the current chart's timeframe, it functions identically to the standard `Gann_HiLo_Pro` indicator. It also fully supports both **standard** and **Heikin Ashi** price data.
+
+## 2. Mathematical Foundations and Calculation Logic
+
+The underlying calculation is identical to the standard Gann HiLo Activator, based on moving averages of Highs and Lows. The key innovation here is the multi-timeframe application.
+
+### Calculation Steps (Algorithm)
+
+1. **Fetch Higher Timeframe Data:** The indicator retrieves the OHLC price data for the user-selected higher timeframe (`htf`).
+2. **Calculate Gann HiLo on the Higher Timeframe:** The complete calculation (MA of Highs, MA of Lows, Trend Logic) is performed using the `htf` price data.
+3. **Project to Current Chart:** The calculated `htf` values (both the price level and the trend color) are mapped to the current chart, creating a characteristic "step-like" line that represents the higher timeframe's trend.
+
+## 3. MQL5 Implementation Details
+
+* **Self-Contained and Robust:** This indicator is fully self-contained and does not depend on any external indicator files (`iCustom`). It directly fetches the required higher-timeframe price data using built-in `Copy...` functions for maximum stability.
+
+* **Modular Calculation Engine (`Gann_HiLo_Calculator.mqh`):** The indicator reuses the exact same calculation engine as the standard `Gann_HiLo_Pro`. This ensures mathematical consistency across all versions.
+
+* **Optimized Incremental Calculation (O(1)):**
+    Unlike basic MTF indicators that recalculate the entire history on every tick, this indicator employs a sophisticated incremental algorithm:
+  * **HTF State Tracking:** It tracks the calculation state of the higher timeframe separately (`g_htf_prev_calculated`).
+  * **Persistent Buffers:** The internal buffers for the higher timeframe (HiAvg, LoAvg, Trend) are maintained globally, preserving the state between ticks.
+  * **Efficient Mapping:** The projection loop only updates the bars corresponding to the new data.
+  * This ensures the indicator remains lightweight and high-performance even on heavy load.
+
+* **Dual-Mode Logic:** The `OnCalculate` function contains a smart branching logic.
+  * If a higher timeframe is selected, it performs the optimized MTF data fetching and projection process.
+  * If the current timeframe is selected, it bypasses the MTF logic and functions identically to the standard `Gann_HiLo_Pro`.
+
+## 4. Parameters
+
+* **Upper Timeframe (`InpUpperTimeframe`):** The higher timeframe on which the Gann HiLo will be calculated. If set to `PERIOD_CURRENT`, the indicator will run on the current chart's timeframe.
+* **Period (`InpPeriod`):** The lookback period for the high and low moving averages. (Default: `10`).
+* **MA Method (`InpMAMethod`):** The type of moving average to use (Simple, Exponential, etc.). (Default: `MODE_SMA`).
+* **Candle Source (`InpCandleSource`):** Allows the user to select the candle type for the calculation.
+  * `CANDLE_STANDARD`: Uses the standard chart's High, Low, and Close.
+  * `CANDLE_HEIKIN_ASHI`: Uses the smoothed Heikin Ashi High, Low, and Close.
+
+## 5. Usage and Interpretation
+
+The MTF version of Gann HiLo is an exceptionally powerful tool for multi-timeframe trend analysis.
+
+* **Major Trend Filter:** The color of the MTF Gann HiLo line provides a clear view of the dominant market condition.
+  * **Blue Line (Below Price):** The higher timeframe is in an uptrend. Look for buy setups on the lower timeframe.
+  * **Red Line (Above Price):** The higher timeframe is in a downtrend. Look for sell setups on the lower timeframe.
+
+* **Dynamic Support and Resistance:** The MTF Gann HiLo line acts as a strong support/resistance level. Price often bounces off this level during pullbacks in a strong trend.
+
+* **Trailing Stop-Loss:** For swing traders, the MTF Gann HiLo provides an excellent trailing stop level that is less likely to be hit by random noise on the lower timeframe.