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Indicators/MyIndicators/HMA_HeikinAshi.mq5

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+//+------------------------------------------------------------------+
+//|                                          HMA_HeikinAshi.mq5      |
+//|                      Copyright 2025, xxxxxxxx                    |
+//|                                                                  |
+//+------------------------------------------------------------------+
+#property copyright "Copyright 2025, xxxxxxxx"
+#property link      ""
+#property version   "2.00" // Refactored for full recalculation and stability
+#property description "Hull Moving Average (HMA) on Heikin Ashi data"
+
+#include <MyIncludes\HeikinAshi_Tools.mqh>
+#include <MovingAverages.mqh>
+
+//--- Indicator Window and Plot Properties ---
+#property indicator_chart_window
+#property indicator_buffers 4
+#property indicator_plots   1
+
+//--- Plot 1: HMA line
+#property indicator_label1  "HA_HMA"
+#property indicator_type1   DRAW_LINE
+#property indicator_color1  clrDeepPink
+#property indicator_style1  STYLE_SOLID
+#property indicator_width1  2
+
+//--- Enum for selecting Heikin Ashi price source ---
+enum ENUM_HA_APPLIED_PRICE
+  {
+   HA_PRICE_CLOSE, // Heikin Ashi Close
+   HA_PRICE_OPEN,  // Heikin Ashi Open
+   HA_PRICE_HIGH,  // Heikin Ashi High
+   HA_PRICE_LOW,   // Heikin Ashi Low
+  };
+
+//--- Input Parameters ---
+input int                  InpPeriodHMA    = 14;
+input ENUM_HA_APPLIED_PRICE InpAppliedPrice = HA_PRICE_CLOSE;
+
+//--- Indicator Buffers ---
+double    BufferHA_HMA[];
+double    BufferWMA_Half[];
+double    BufferWMA_Full[];
+double    BufferRawHMA[];
+
+//--- Intermediate Heikin Ashi Buffers ---
+double    ExtHaOpenBuffer[];
+double    ExtHaHighBuffer[];
+double    ExtHaLowBuffer[];
+double    ExtHaCloseBuffer[];
+
+//--- Global Objects and Variables ---
+int                       g_ExtPeriodHMA;
+CHeikinAshi_Calculator   *g_ha_calculator; // Pointer to our Heikin Ashi calculator
+
+//+------------------------------------------------------------------+
+//| Custom indicator initialization function.                        |
+//+------------------------------------------------------------------+
+int OnInit()
+  {
+   g_ExtPeriodHMA = (InpPeriodHMA < 1) ? 1 : InpPeriodHMA;
+
+   SetIndexBuffer(0, BufferHA_HMA,   INDICATOR_DATA);
+   SetIndexBuffer(1, BufferWMA_Half, INDICATOR_CALCULATIONS);
+   SetIndexBuffer(2, BufferWMA_Full, INDICATOR_CALCULATIONS);
+   SetIndexBuffer(3, BufferRawHMA,   INDICATOR_CALCULATIONS);
+
+   ArraySetAsSeries(BufferHA_HMA,   false);
+   ArraySetAsSeries(BufferWMA_Half, false);
+   ArraySetAsSeries(BufferWMA_Full, false);
+   ArraySetAsSeries(BufferRawHMA,   false);
+
+   IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
+   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, g_ExtPeriodHMA + (int)MathFloor(MathSqrt(g_ExtPeriodHMA)) - 2);
+   IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("HA_HMA(%d)", g_ExtPeriodHMA));
+
+//--- Create the calculator instance
+   g_ha_calculator = new CHeikinAshi_Calculator();
+   if(CheckPointer(g_ha_calculator) == POINTER_INVALID)
+     {
+      Print("Error creating CHeikinAshi_Calculator object");
+      return(INIT_FAILED);
+     }
+
+   return(INIT_SUCCEEDED);
+  }
+
+//+------------------------------------------------------------------+
+//| Custom indicator deinitialization function.                      |
+//+------------------------------------------------------------------+
+void OnDeinit(const int reason)
+  {
+//--- Free the calculator object to prevent memory leaks
+   if(CheckPointer(g_ha_calculator) != POINTER_INVALID)
+     {
+      delete g_ha_calculator;
+      g_ha_calculator = NULL;
+     }
+  }
+
+//+------------------------------------------------------------------+
+//| Hull Moving Average on Heikin Ashi calculation function.         |
+//+------------------------------------------------------------------+
+int OnCalculate(const int rates_total,
+                const int prev_calculated,
+                const datetime &time[],
+                const double &open[],
+                const double &high[],
+                const double &low[],
+                const double &close[],
+                const long &tick_volume[],
+                const long &volume[],
+                const int &spread[])
+  {
+   int start_pos = g_ExtPeriodHMA + (int)MathFloor(MathSqrt(g_ExtPeriodHMA)) - 2;
+   if(rates_total <= start_pos)
+      return(0);
+
+//--- Resize intermediate buffers
+   ArrayResize(ExtHaOpenBuffer, rates_total);
+   ArrayResize(ExtHaHighBuffer, rates_total);
+   ArrayResize(ExtHaLowBuffer, rates_total);
+   ArrayResize(ExtHaCloseBuffer, rates_total);
+
+//--- STEP 1: Calculate Heikin Ashi bars
+   g_ha_calculator.Calculate(rates_total, open, high, low, close,
+                             ExtHaOpenBuffer, ExtHaHighBuffer, ExtHaLowBuffer, ExtHaCloseBuffer);
+
+//--- STEP 2: Select the source Heikin Ashi price array
+   double ha_price_source[];
+   switch(InpAppliedPrice)
+     {
+      case HA_PRICE_OPEN:
+         ArrayCopy(ha_price_source, ExtHaOpenBuffer);
+         break;
+      case HA_PRICE_HIGH:
+         ArrayCopy(ha_price_source, ExtHaHighBuffer);
+         break;
+      case HA_PRICE_LOW:
+         ArrayCopy(ha_price_source, ExtHaLowBuffer);
+         break;
+      default:
+         ArrayCopy(ha_price_source, ExtHaCloseBuffer);
+         break;
+     }
+
+//--- STEP 3: Calculate all HMA components in a single, efficient loop
+   int period_half = (int)MathMax(1, MathRound(g_ExtPeriodHMA / 2.0));
+   int period_sqrt = (int)MathMax(1, MathRound(MathSqrt(g_ExtPeriodHMA)));
+
+   for(int i = g_ExtPeriodHMA - 1; i < rates_total; i++)
+     {
+      // Calculate the two base WMAs
+      BufferWMA_Half[i] = LinearWeightedMA(i, period_half, ha_price_source);
+      BufferWMA_Full[i] = LinearWeightedMA(i, g_ExtPeriodHMA, ha_price_source);
+
+      // Calculate the raw HMA
+      BufferRawHMA[i] = 2 * BufferWMA_Half[i] - BufferWMA_Full[i];
+     }
+
+//--- STEP 4: Smooth the raw HMA with the final WMA
+   for(int i = start_pos; i < rates_total; i++)
+     {
+      BufferHA_HMA[i] = LinearWeightedMA(i, period_sqrt, BufferRawHMA);
+     }
+
+   return(rates_total);
+  }
+//+------------------------------------------------------------------+
+//+------------------------------------------------------------------+