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2026-07-27 20:47:44 +00:00 · 2026-07-03 20:36:41 +02:00
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+//+------------------------------------------------------------------+
+//|                                   Butterworth_Channel_Pro.mq5    |
+//|                                          Copyright 2026, xxxxxxxx|
+//+------------------------------------------------------------------+
+#property copyright "Copyright 2026, xxxxxxxx"
+#property version   "1.00" // High-performance John Ehlers' Butterworth Channel with 3-digit precision
+#property description "Butterworth Channel (Keltner Concept): Butterworth Filter Middle Line + ATR Bands."
+
+#property indicator_chart_window
+#property indicator_buffers 3
+#property indicator_plots   3
+
+//--- Plot 1: Upper Band
+#property indicator_label1  "Upper Band"
+#property indicator_type1   DRAW_LINE
+#property indicator_color1  clrMediumSlateBlue
+#property indicator_style1  STYLE_DOT
+#property indicator_width1  1
+
+//--- Plot 2: Lower Band
+#property indicator_label2  "Lower Band"
+#property indicator_type2   DRAW_LINE
+#property indicator_color2  clrMediumSlateBlue
+#property indicator_style2  STYLE_DOT
+#property indicator_width2  1
+
+//--- Plot 3: Middle Band (Butterworth)
+#property indicator_label3  "Smoother"
+#property indicator_type3   DRAW_LINE
+#property indicator_color3  clrCrimson
+#property indicator_style3  STYLE_SOLID
+#property indicator_width3  1
+
+#include <MyIncludes\Butterworth_Channel_Calculator.mqh>
+
+//--- Input Parameters
+input group                     "Butterworth Settings"
+input int                       InpPeriod         = 20;            // Filter Period
+input ENUM_BUTTERWORTH_POLES    InpPoles          = POLES_TWO;       // Filter Poles (2 or 3)
+input ENUM_APPLIED_PRICE_HA_ALL InpSourcePrice    = PRICE_CLOSE_STD; // Price Source
+
+//+------------------------------------------------------------------+
+//|                                                                  |
+//+------------------------------------------------------------------+
+input group                     "Channel (ATR) Settings"
+input int                       InpAtrPeriod      = 14;              // ATR Period
+input double                    InpMultiplier     = 2.0;             // ATR Multiplier
+input ENUM_ATR_SOURCE           InpAtrSource      = ATR_SOURCE_STANDARD; // ATR Source Price
+
+//--- Buffers
+double    BufferUpper[];
+double    BufferLower[];
+double    BufferMiddle[];
+
+//--- Global Object
+CButterworthChannelCalculator *g_calculator;
+
+//+------------------------------------------------------------------+
+//| OnInit                                                           |
+//+------------------------------------------------------------------+
+int OnInit()
+  {
+   SetIndexBuffer(0, BufferUpper,  INDICATOR_DATA);
+   SetIndexBuffer(1, BufferLower,  INDICATOR_DATA);
+   SetIndexBuffer(2, BufferMiddle, INDICATOR_DATA);
+   ArraySetAsSeries(BufferUpper,  false);
+   ArraySetAsSeries(BufferLower,  false);
+   ArraySetAsSeries(BufferMiddle, false);
+
+//--- Factory Logic
+   if(InpSourcePrice <= PRICE_HA_CLOSE)
+      g_calculator = new CButterworthChannelCalculator_HA();
+   else
+      g_calculator = new CButterworthChannelCalculator();
+
+//--- Initialize
+   if(CheckPointer(g_calculator) == POINTER_INVALID ||
+      !g_calculator.Init(InpPeriod, InpPoles, InpAtrPeriod, InpMultiplier, InpAtrSource))
+     {
+      Print("Failed to initialize Ehlers Channel Calculator.");
+      return(INIT_FAILED);
+     }
+
+//--- Shortname
+   string type = (InpSourcePrice <= PRICE_HA_CLOSE) ? " HA" : "";
+   IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("Butterworth Ch%s(%d,%d, ATR %d)", type, InpPeriod, (int)InpPoles, InpAtrPeriod));
+
+//--- Visuals
+   int draw_begin = MathMax(InpPeriod, InpAtrPeriod);
+   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, draw_begin);
+   PlotIndexSetInteger(1, PLOT_DRAW_BEGIN, draw_begin);
+   PlotIndexSetInteger(2, PLOT_DRAW_BEGIN, 2); // Smoother warms up fast
+   IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
+
+   return(INIT_SUCCEEDED);
+  }
+
+//+------------------------------------------------------------------+
+//| OnDeinit                                                         |
+//+------------------------------------------------------------------+
+void OnDeinit(const int reason)
+  {
+   if(CheckPointer(g_calculator) != POINTER_INVALID)
+      delete g_calculator;
+  }
+
+//+------------------------------------------------------------------+
+//| OnCalculate                                                      |
+//+------------------------------------------------------------------+
+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(rates_total < MathMax(InpPeriod, InpAtrPeriod))
+      return(0);
+
+   if(CheckPointer(g_calculator) == POINTER_INVALID)
+      return(0);
+
+//--- Force strict chronological indexing for state-safety on input price arrays
+   ArraySetAsSeries(time,  false);
+   ArraySetAsSeries(open,  false);
+   ArraySetAsSeries(high,  false);
+   ArraySetAsSeries(low,   false);
+   ArraySetAsSeries(close, false);
+
+   ENUM_APPLIED_PRICE price_type = (InpSourcePrice <= PRICE_HA_CLOSE) ?
+                                   (ENUM_APPLIED_PRICE)(-(int)InpSourcePrice) :
+                                   (ENUM_APPLIED_PRICE)InpSourcePrice;
+
+   g_calculator.Calculate(rates_total, prev_calculated, open, high, low, close, price_type,
+                          BufferMiddle, BufferUpper, BufferLower);
+
+   return(rates_total);
+  }
+//+------------------------------------------------------------------+