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Indicators/MyIndicators/Holt_Pro.mq5

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+//+------------------------------------------------------------------+
+//|                                                    Holt_Pro.mq5  |
+//|                                          Copyright 2025, xxxxxxxx|
+//+------------------------------------------------------------------+
+#property copyright "Copyright 2025, xxxxxxxx"
+#property version   "4.00"
+#property description "Professional Holt's Linear Trend Method, displaying either the"
+#property description "MA line or a full forecast channel. Supports Standard and Heikin Ashi."
+
+#property indicator_chart_window
+#property indicator_buffers 3
+#property indicator_plots   3
+
+//--- Plot 1: Center Line (Holt MA)
+#property indicator_label1  "Holt MA"
+#property indicator_type1   DRAW_LINE
+#property indicator_color1  clrMediumSeaGreen
+#property indicator_style1  STYLE_SOLID
+#property indicator_width1  2
+
+//--- Plot 2: Upper Band
+#property indicator_label2  "Upper Channel"
+#property indicator_type2   DRAW_LINE
+#property indicator_color2  clrSilver
+#property indicator_style2  STYLE_DOT
+#property indicator_width1  1
+
+//--- Plot 3: Lower Band
+#property indicator_label3  "Lower Channel"
+#property indicator_type3   DRAW_LINE
+#property indicator_color3  clrSilver
+#property indicator_style3  STYLE_DOT
+#property indicator_width2  1
+
+//--- Include the calculator engine ---
+#include <MyIncludes\Holt_Calculator.mqh>
+
+//--- Enum for Display Mode ---
+enum ENUM_DISPLAY_MODE
+  {
+   DISPLAY_MA_ONLY,       // Display only the Holt MA line
+   DISPLAY_MA_AND_CHANNEL // Display the MA and the forecast channel
+  };
+
+//--- Custom Enum for Price Source, including Heikin Ashi ---
+enum ENUM_APPLIED_PRICE_HA_ALL
+  {
+//--- Heikin Ashi Prices (negative values for easy identification)
+   PRICE_HA_CLOSE    = -1,
+   PRICE_HA_OPEN     = -2,
+   PRICE_HA_HIGH     = -3,
+   PRICE_HA_LOW      = -4,
+   PRICE_HA_MEDIAN   = -5,
+   PRICE_HA_TYPICAL  = -6,
+   PRICE_HA_WEIGHTED = -7,
+//--- Standard Prices (using built-in ENUM_APPLIED_PRICE values)
+   PRICE_CLOSE_STD   = PRICE_CLOSE,
+   PRICE_OPEN_STD    = PRICE_OPEN,
+   PRICE_HIGH_STD    = PRICE_HIGH,
+   PRICE_LOW_STD     = PRICE_LOW,
+   PRICE_MEDIAN_STD  = PRICE_MEDIAN,
+   PRICE_TYPICAL_STD = PRICE_TYPICAL,
+   PRICE_WEIGHTED_STD= PRICE_WEIGHTED
+  };
+
+//--- Input Parameters ---
+input group                     "Holt Model Settings"
+input int                       InpPeriod      = 20;
+input double                    InpAlpha       = 0.1;
+input double                    InpBeta        = 0.05;
+input ENUM_APPLIED_PRICE_HA_ALL InpSourcePrice = PRICE_CLOSE_STD;
+input group                     "Display Settings"
+input ENUM_DISPLAY_MODE         InpDisplayMode = DISPLAY_MA_AND_CHANNEL;
+input int                       InpForecastPeriod = 5;     // Forecast period for the channel
+
+//--- Indicator Buffers ---
+double    BufferHoltMA[];
+double    BufferUpperBand[];
+double    BufferLowerBand[];
+
+//--- Global calculator object (as a base class pointer) ---
+CHoltMACalculator *g_calculator;
+
+//+------------------------------------------------------------------+
+//| Custom indicator initialization function.                        |
+//+------------------------------------------------------------------+
+int OnInit()
+  {
+//--- Map the buffers and set as non-timeseries
+   SetIndexBuffer(0, BufferHoltMA,     INDICATOR_DATA);
+   SetIndexBuffer(1, BufferUpperBand,  INDICATOR_DATA);
+   SetIndexBuffer(2, BufferLowerBand,  INDICATOR_DATA);
+   ArraySetAsSeries(BufferHoltMA,     false);
+   ArraySetAsSeries(BufferUpperBand,  false);
+   ArraySetAsSeries(BufferLowerBand,  false);
+
+//--- Dynamically create the appropriate calculator instance
+   if(InpSourcePrice <= PRICE_HA_CLOSE) // Heikin Ashi source selected
+     {
+      g_calculator = new CHoltMACalculator_HA();
+      IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("Holt Pro HA(%d)", InpPeriod));
+     }
+   else // Standard price source selected
+     {
+      g_calculator = new CHoltMACalculator();
+      IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("Holt Pro(%d)", InpPeriod));
+     }
+
+//--- Check if creation was successful and initialize
+   if(CheckPointer(g_calculator) == POINTER_INVALID || !g_calculator.Init(InpPeriod, InpAlpha, InpBeta, InpForecastPeriod))
+     {
+      Print("Failed to initialize Holt MA Calculator.");
+      return(INIT_FAILED);
+     }
+
+//--- Set indicator display properties
+   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, 2);
+   PlotIndexSetInteger(1, PLOT_DRAW_BEGIN, 2);
+   PlotIndexSetInteger(2, PLOT_DRAW_BEGIN, 2);
+
+   return(INIT_SUCCEEDED);
+  }
+
+//+------------------------------------------------------------------+
+//| Custom indicator deinitialization function.                      |
+//+------------------------------------------------------------------+
+void OnDeinit(const int reason)
+  {
+//--- Free the calculator object to prevent memory leaks
+   if(CheckPointer(g_calculator) != POINTER_INVALID)
+      delete g_calculator;
+  }
+
+//+------------------------------------------------------------------+
+//| Custom indicator iteration 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[])
+  {
+//--- Ensure the calculator object is valid
+   if(CheckPointer(g_calculator) == POINTER_INVALID)
+      return 0;
+
+//--- Convert our custom enum to the standard ENUM_APPLIED_PRICE
+   ENUM_APPLIED_PRICE price_type;
+   if(InpSourcePrice <= PRICE_HA_CLOSE)
+      price_type = (ENUM_APPLIED_PRICE)(-(int)InpSourcePrice);
+   else
+      price_type = (ENUM_APPLIED_PRICE)InpSourcePrice;
+
+//--- Delegate the entire calculation to our calculator object
+   g_calculator.Calculate(rates_total, price_type, open, high, low, close, BufferHoltMA, BufferUpperBand, BufferLowerBand);
+
+//--- Hide buffers based on display mode
+   if(InpDisplayMode == DISPLAY_MA_ONLY)
+     {
+      for(int i = 0; i < rates_total; i++)
+        {
+         BufferUpperBand[i] = EMPTY_VALUE;
+         BufferLowerBand[i] = EMPTY_VALUE;
+        }
+     }
+
+//--- Return rates_total for a full recalculation, ensuring stability
+   return(rates_total);
+  }
+//+------------------------------------------------------------------+
+//+------------------------------------------------------------------+