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2026-07-27 20:47:44 +00:00 · 2025-09-22 13:53:33 +02:00
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+//+------------------------------------------------------------------+
+//|                                                 Holt_Channel.mq5 |
+//|                                          Copyright 2025, xxxxxxxx|
+//|                                                                  |
+//+------------------------------------------------------------------+
+#property copyright "Copyright 2025, xxxxxxxx"
+#property version   "1.00"
+#property description "Holt's Forecast Channel. Displays a channel based on"
+#property description "the multi-period forecast of the Holt's Linear Trend model."
+
+#property indicator_chart_window
+#property indicator_buffers 3
+#property indicator_plots   3
+
+#include <MyIncludes\Holt_Calculator.mqh>
+
+//--- Plot 1: Upper Band
+#property indicator_label1  "Upper Channel"
+#property indicator_type1   DRAW_LINE
+#property indicator_color1  clrSilver
+#property indicator_style1  STYLE_DOT
+#property indicator_width1  1
+
+//--- Plot 2: Lower Band
+#property indicator_label2  "Lower Channel"
+#property indicator_type2   DRAW_LINE
+#property indicator_color2  clrSilver
+#property indicator_style2  STYLE_DOT
+#property indicator_width2  1
+
+//--- Plot 3: Center Line (Holt MA)
+#property indicator_label3  "Center Line"
+#property indicator_type3   DRAW_LINE
+#property indicator_color3  clrMediumSeaGreen
+#property indicator_style3  STYLE_SOLID
+#property indicator_width3  2
+
+//--- Input Parameters ---
+input int              InpPeriod         = 20;
+input double           InpAlpha          = 0.1;
+input double           InpBeta           = 0.05;
+input int              InpForecastPeriod = 5;     // Forecast period for the channel
+input ENUM_APPLIED_PRICE InpSourcePrice    = PRICE_CLOSE;
+
+//--- Indicator Buffers ---
+double    BufferUpperBand[];
+double    BufferLowerBand[];
+double    BufferCenterLine[];
+
+//--- Global calculator object ---
+CHoltMACalculator *g_calculator;
+
+//+------------------------------------------------------------------+
+//| Custom indicator initialization function.                        |
+//+------------------------------------------------------------------+
+int OnInit()
+  {
+   SetIndexBuffer(0, BufferUpperBand,  INDICATOR_DATA);
+   SetIndexBuffer(1, BufferLowerBand,  INDICATOR_DATA);
+   SetIndexBuffer(2, BufferCenterLine, INDICATOR_DATA);
+
+   ArraySetAsSeries(BufferUpperBand,  false);
+   ArraySetAsSeries(BufferLowerBand,  false);
+   ArraySetAsSeries(BufferCenterLine, false);
+
+   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, 2);
+   PlotIndexSetInteger(1, PLOT_DRAW_BEGIN, 2);
+   PlotIndexSetInteger(2, PLOT_DRAW_BEGIN, 2);
+   IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("Holt Channel(%d, %d)", InpPeriod, InpForecastPeriod));
+
+   g_calculator = new CHoltMACalculator();
+   if(CheckPointer(g_calculator) == POINTER_INVALID || !g_calculator.Init(InpPeriod, InpAlpha, InpBeta))
+     {
+      Print("Failed to initialize Holt MA Calculator.");
+      return(INIT_FAILED);
+     }
+   return(INIT_SUCCEEDED);
+  }
+
+//+------------------------------------------------------------------+
+//| Custom indicator deinitialization function.                      |
+//+------------------------------------------------------------------+
+void OnDeinit(const int reason)
+  {
+   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[])
+  {
+   if(CheckPointer(g_calculator) != POINTER_INVALID)
+     {
+      //--- Step 1: Run the main calculation to get the core components
+      double trend_buffer[];
+      g_calculator.Calculate(rates_total, InpSourcePrice, open, high, low, close, BufferCenterLine, trend_buffer);
+
+      //--- Step 2: Calculate the channel bands based on the forecast and trend
+      int forecast_period = (InpForecastPeriod < 1) ? 1 : InpForecastPeriod;
+
+      for(int i = 2; i < rates_total; i++)
+        {
+         // Reconstruct the Level component: Level = Forecast - Trend
+         double level = BufferCenterLine[i] - trend_buffer[i];
+
+         // Calculate the multi-period forecast for the bands
+         BufferUpperBand[i] = level + forecast_period * trend_buffer[i];
+         BufferLowerBand[i] = level - forecast_period * trend_buffer[i];
+        }
+     }
+   return(rates_total);
+  }
+//+------------------------------------------------------------------+
+//+------------------------------------------------------------------+