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+# Fast Stochastic Professional
+
+## 1. Summary (Introduction)
+
+The Fast Stochastic Oscillator, developed by George C. Lane, is a momentum indicator that compares a closing price to its price range over a period. It is the original, un-smoothed version of the Stochastic oscillator.
+
+The indicator consists of two lines:
+
+* **%K Line:** The "raw" stochastic value, which is highly sensitive to price changes.
+* **%D Line:** A moving average of the %K line, which acts as a signal line.
+
+Because it lacks the extra smoothing layer of the "Slow" version, the Fast Stochastic is much more responsive but also more prone to generating false signals ("whipsaws") in choppy markets.
+
+Our `StochasticFast_Pro` implementation is a unified, professional version that allows the calculation to be based on either **standard** or **Heikin Ashi** price data.
+
+## 2. Mathematical Foundations and Calculation Logic
+
+The Fast Stochastic's %K line is the raw calculation, and the %D line is its direct moving average.
+
+### Required Components
+
+* **%K Period:** The main lookback period for the Stochastic calculation.
+* **%D Period & MA Method:** The period and type of moving average for the signal line.
+* **Price Data:** The `High`, `Low`, and `Close` of each bar.
+
+### Calculation Steps (Algorithm)
+
+1. **Calculate the %K Line (Fast %K):** This is the core of the Stochastic calculation. It measures where the current close is relative to the price range over the `%K Period`.
+    $\text{\%K}_t = 100 \times \frac{\text{Close}_t - \text{Lowest Low}_{\%K \text{ Period}}}{\text{Highest High}_{\%K \text{ Period}} - \text{Lowest Low}_{\%K \text{ Period}}}$
+
+2. **Calculate the %D Line (Signal Line):** The signal line is a moving average of the %K line, using the selected `%D MA Method` and `%D Period`.
+    $\text{\%D}_t = \text{MA}(\text{\%K}, \text{\%D Period}, \text{\%D MA Method})_t$
+
+## 3. MQL5 Implementation Details
+
+Our MQL5 implementation is a robust, unified indicator built on a modular, object-oriented framework.
+
+* **Modular Calculation Engine (`StochasticFast_Calculator.mqh`):**
+    The entire calculation logic for both standard and Heikin Ashi versions is encapsulated within a single, powerful include file.
+  * An elegant, object-oriented inheritance model (`CStochasticFastCalculator` and `CStochasticFastCalculator_HA`) allows the main indicator file to dynamically choose the correct calculation engine at runtime based on user input, eliminating code duplication.
+
+* **Full MA Type Support:** The calculator contains a complete, robust implementation for all standard MQL5 MA types (SMA, EMA, SMMA, LWMA) for the "%D" signal line smoothing.
+
+* **Stability via Full Recalculation:** We employ a "brute-force" full recalculation within `OnCalculate` to ensure that the multi-stage calculation remains stable and accurate.
+
+## 4. Parameters
+
+* **%K Period (`InpKPeriod`):** The lookback period for the initial Stochastic calculation. Default is `14`.
+* **%D Period (`InpDPeriod`):** The smoothing period for the final signal line (%D). Default is `3`.
+* **%D MA Type (`InpDMAType`):** The type of moving average used for the "%D" step. Default is `MODE_SMA`.
+* **Candle Source (`InpCandleSource`):** Allows the user to select the candle type for the calculation (`Standard` or `Heikin Ashi`).
+
+## 5. Usage and Interpretation
+
+* **Overbought/Oversold Levels:** The primary use is to identify overbought (typically above 80) and oversold (typically below 20) conditions.
+* **Crossovers:** The crossover of the %K line and the %D signal line is a common trade signal. Due to the indicator's sensitivity, these signals will be more frequent than with the Slow Stochastic.
+* **Divergence:** Look for divergences between the Stochastic and the price action.
+* **Using Heikin Ashi:** Selecting the Heikin Ashi option results in a smoother oscillator, which can help mitigate some of the inherent "choppiness" of the Fast Stochastic.
+* **Caution:** The Fast Stochastic is a very sensitive, range-bound oscillator. It generates many signals and is highly susceptible to market noise. It is often used by short-term traders or as a component in a larger system rather than as a standalone signal generator. Many traders prefer the smoother signals of the Slow Stochastic.