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+# Williams' Percent Range (WPR) Professional
+
+## 1. Summary (Introduction)
+
+Williams' Percent Range (%R), developed by Larry Williams, is a momentum oscillator that identifies overbought and oversold conditions. It is mathematically the inverse of the **Fast Stochastic Oscillator's %K line**, plotted on a negative scale from -100 to 0.
+
+Our `WPR_Pro` implementation is a unified, professional version that not only allows the calculation to be based on either **standard** or **Heikin Ashi** price data, but also includes an optional, fully customizable **signal line**, effectively mirroring the functionality of a full Fast Stochastic oscillator on the WPR's scale.
+
+## 2. Mathematical Foundations and Calculation Logic
+
+The %R formula compares the current close to the recent high-low range.
+
+### Required Components
+
+* **Period (N):** The lookback period for the calculation (e.g., 14).
+* **Price Data:** The `High`, `Low`, and `Close` of each bar.
+
+### Calculation Steps (Algorithm)
+
+1. **Find the Highest High and Lowest Low:** For each bar, determine the highest high and lowest low over the last `N` periods.
+2. **Calculate the Williams %R:** Apply the main formula.
+    $\text{\%R}_i = -100 \times \frac{\text{Highest High}_N - \text{Close}_i}{\text{Highest High}_N - \text{Lowest Low}_N}$
+
+This is mathematically equivalent to: $\text{\%R}_i = \text{Fast \%K}_i - 100$.
+
+## 3. MQL5 Implementation Details
+
+Our MQL5 implementation is a prime example of our "Pragmatic Reusability" principle, built as an intelligent "adapter" on top of our existing Stochastic engine.
+
+* **Adapter Design Pattern:** The `WPR_Calculator` does not contain any WPR calculation logic itself. Instead, it **reuses** our existing, standalone `StochasticFast_Calculator.mqh` module.
+  * It calls the Fast Stochastic engine to get the %K and %D lines.
+  * It then performs a simple transformation (`value - 100`) on the results to convert them to the WPR's -100 to 0 scale.
+  * This approach eliminates code duplication and guarantees that our WPR and Fast Stochastic indicators are always perfectly in sync.
+
+* **Object-Oriented Logic:**
+  * The `CWPRCalculator` base class contains a pointer to a `CStochasticFastCalculator` object.
+  * The Heikin Ashi version (`CWPRCalculator_HA`) is achieved simply by instantiating the Heikin Ashi version of the Stochastic module (`CStochasticFastCalculator_HA`).
+
+* **Optional Signal Line:** The indicator includes a fully customizable moving average signal line, inherited directly from the underlying Fast Stochastic's %D calculation.
+
+## 4. Parameters
+
+* **WPR Period (`InpWPRPeriod`):** The lookback period for the indicator. Default is `14`.
+* **Candle Source (`InpCandleSource`):** Allows the user to select the candle type for the calculation (`Standard` or `Heikin Ashi`).
+* **Display Mode (`InpDisplayMode`):** Toggles the visibility of the signal line.
+* **Signal Line Settings:**
+  * `InpSignalPeriod`: The lookback period for the signal line.
+  * `InpSignalMAType`: The type of moving average for the signal line.
+
+## 5. Usage and Interpretation
+
+* **Overbought/Oversold Levels:**
+  * **Overbought:** Readings between **0 and -20**.
+  * **Oversold:** Readings between **-80 and -100**.
+* **Divergence:** Look for divergences between the %R and the price action.
+* **Momentum Failure:** A common signal is when the %R enters the overbought zone, pulls back, and then fails to re-enter it on a subsequent price rally.
+* **Caution:** Like all oscillators, %R can remain in overbought or oversold territory for extended periods during a strong trend.