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62 lines
4.1 KiB
Markdown
62 lines
4.1 KiB
Markdown
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# Volume Weighted Average Price (VWAP) Professional
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## 1. Summary (Introduction)
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The Volume Weighted Average Price (VWAP) is a benchmark indicator used by traders, particularly in intraday analysis, to determine the average price a security has traded at throughout a period, based on both price and volume. It provides a much more accurate picture of the "true" average price by giving more weight to price levels with higher trading volume.
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A key feature of the VWAP is that it is **periodically reset**, typically at the start of a new day, week, or month.
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Our `VWAP_Pro` implementation is a unified, professional version that allows the calculation to be based on either **standard** or **Heikin Ashi** price data, and offers selectable reset periods.
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## 2. Mathematical Foundations and Calculation Logic
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The VWAP is the cumulative ratio of the volume-weighted price to the cumulative volume over a given period.
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### Required Components
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* **Price Data:** The `High`, `Low`, and `Close` of each bar. The **Typical Price** `(H+L+C)/3` is standard.
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* **Volume Data:** The volume for each bar.
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### Calculation Steps (Algorithm)
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1. **Start of a New Period (e.g., new day):** Reset the cumulative values to zero.
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* `Cumulative (TP x Volume) = 0`
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* `Cumulative Volume = 0`
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2. **For Each Bar within the Period:**
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* Calculate the Typical Price: $\text{TP}_i = \frac{\text{High}_i + \text{Low}_i + \text{Close}_i}{3}$
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* Update the cumulative sums:
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* `Cumulative (TP x Volume) += TP_i \times \text{Volume}_i`
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* `Cumulative Volume += \text{Volume}_i`
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3. **Calculate the VWAP:**
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* $\text{VWAP}_i = \frac{\text{Cumulative (TP * Volume)}}{\text{Cumulative Volume}}$
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## 3. MQL5 Implementation Details
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Our MQL5 implementation follows a modern, object-oriented design to ensure stability, reusability, and a clean visual representation.
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* **Modular Calculation Engine (`VWAP_Calculator.mqh`):**
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The entire calculation logic is encapsulated within a reusable include file.
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* **`CVWAPCalculator`**: The base class that performs the full VWAP calculation.
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* **`CVWAPCalculator_HA`**: A child class that inherits all logic and only overrides the data preparation step to use the Typical Price derived from smoothed Heikin Ashi candles.
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* **Robust Period Reset Logic:** The calculator uses `MqlDateTime` structures to accurately detect the start of a new session, week, or month, ensuring the VWAP resets correctly under all conditions.
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* **Clean Gapped-Line Drawing:** To provide a clear visual separation between periods, the indicator uses a "double buffer" technique. It plots odd-numbered periods (1st day, 3rd day, etc.) and even-numbered periods (2nd day, 4th day, etc.) on two separate, overlapping plot buffers. This creates a distinct visual gap at each reset point without losing any data from the current, ongoing period.
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* **Stability via Full Recalculation:** We employ a "brute-force" full recalculation within `OnCalculate` for maximum stability.
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## 4. Parameters
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* **Reset Period (`InpResetPeriod`):** The period at which the VWAP calculation resets. Options are `Session` (daily), `Week`, and `Month`.
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* **Volume Type (`InpVolumeType`):** Allows the user to select between Tick Volume and Real Volume.
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* **Candle Source (`InpCandleSource`):** Allows the user to select the candle type for the Typical Price calculation (`Standard` or `Heikin Ashi`).
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## 5. Usage and Interpretation
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* **Benchmark for "Fair Value":** The VWAP is often considered the "true" average price for the period.
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* **Price > VWAP:** The market is considered to be in a bullish state for that period.
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* **Price < VWAP:** The market is considered to be in a bearish state for that period.
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* **Dynamic Support and Resistance:** The VWAP line itself acts as a powerful, dynamic level of support or resistance during the trading session.
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* **Mean Reversion:** A significant deviation of the price from the VWAP often leads to a reversion back towards it.
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* **Execution Benchmark:** Institutional traders often use the VWAP to gauge the quality of their trade executions. Buying below the VWAP or selling above it is considered a good execution.
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