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Indicators/MyIndicators/Authors/Ehlers/2_Oscillators/Laguerre_Slope_Pro.mq5

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+//+------------------------------------------------------------------+
+//|                                           Laguerre_Slope_Pro.mq5|
+//|                                          Copyright 2026, xxxxxxxx|
+//+------------------------------------------------------------------+
+#property copyright "Copyright 2026, xxxxxxxx"
+#property version   "1.20" // Optimized for incremental calculation and 5-zone state classification
+#property description "Slope derivative of John Ehlers' Laguerre Filter."
+#property description "Features a 5-zone symmetrical thermal color palette."
+
+#property indicator_separate_window
+#property indicator_buffers 2
+#property indicator_plots   1
+
+#property indicator_label1  "Laguerre Slope"
+#property indicator_type1   DRAW_COLOR_HISTOGRAM
+#property indicator_style1  STYLE_SOLID
+#property indicator_width1  2
+
+//--- The Symmetrical Thermal Slope Palette (5-Zone Matrix)
+#property indicator_color1  clrGray, clrMediumSeaGreen, clrPaleGreen, clrCrimson, clrLightCoral
+
+#include <MyIncludes\Laguerre_Slope_Calculator.mqh>
+
+//--- Input Parameters ---
+input double                    InpGamma        = 0.5;             // Laguerre Gamma (e.g. 0.236, 0.382, 0.618)
+input ENUM_APPLIED_PRICE_HA_ALL InpSourcePrice  = PRICE_CLOSE_STD; // Price Source
+input double                    InpThreshold    = 0.00005;         // Slope Neutral Threshold (e.g. 0.00005)
+
+//--- Indicator Buffers ---
+double    BufferSlope[];
+double    BufferSlopeColor[];
+
+//--- Global Calculator Object ---
+CLaguerreSlopeCalculator *g_calculator;
+
+//+------------------------------------------------------------------+
+//| Custom Indicator Initialization                                  |
+//+------------------------------------------------------------------+
+int OnInit()
+  {
+//--- Bind buffers to index mapping
+   SetIndexBuffer(0, BufferSlope,      INDICATOR_DATA);
+   SetIndexBuffer(1, BufferSlopeColor, INDICATOR_COLOR_INDEX);
+
+//--- Force strict chronological alignment (false = old to new)
+   ArraySetAsSeries(BufferSlope,      false);
+   ArraySetAsSeries(BufferSlopeColor, false);
+
+   bool is_ha = (InpSourcePrice <= PRICE_HA_CLOSE);
+
+//--- Initialize physical calculator engine
+   g_calculator = new CLaguerreSlopeCalculator();
+   if(CheckPointer(g_calculator) == POINTER_INVALID)
+     {
+      Print("Critical Error: Failed to allocate Laguerre Slope Calculator memory.");
+      return(INIT_FAILED);
+     }
+
+   if(!g_calculator.Init(InpGamma, SOURCE_PRICE, is_ha))
+     {
+      Print("Critical Error: Failed to initialize Laguerre Slope Calculator.");
+      return(INIT_FAILED);
+     }
+
+//--- Shortname formatting to 3 decimal places to support Fibonacci Gamma values
+   string short_name = StringFormat("Laguerre Slope%s(%.3f, %.5f)",
+                                    is_ha ? " HA" : "",
+                                    InpGamma,
+                                    InpThreshold);
+   IndicatorSetString(INDICATOR_SHORTNAME, short_name);
+
+//--- High precision display settings for visual smoothness on fractional oscillators
+   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, 2);
+   IndicatorSetInteger(INDICATOR_DIGITS, _Digits + 2);
+
+   return(INIT_SUCCEEDED);
+  }
+
+//+------------------------------------------------------------------+
+//| Custom Indicator Deinitialization                                |
+//+------------------------------------------------------------------+
+void OnDeinit(const int reason)
+  {
+   if(CheckPointer(g_calculator) != POINTER_INVALID)
+     {
+      delete g_calculator;
+     }
+  }
+
+//+------------------------------------------------------------------+
+//| Custom Indicator Calculation Loop                                |
+//+------------------------------------------------------------------+
+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 < 2 || CheckPointer(g_calculator) == POINTER_INVALID)
+      return 0;
+
+//--- Chronological safeguarding of critical calculation arrays
+   ArraySetAsSeries(time,  false);
+   ArraySetAsSeries(open,  false);
+   ArraySetAsSeries(high,  false);
+   ArraySetAsSeries(low,   false);
+   ArraySetAsSeries(close, false);
+
+//--- Handle negative-index Heikin Ashi pricing conversions transparently
+   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 calculation to stateful engine
+   g_calculator.Calculate(rates_total, prev_calculated, price_type, open, high, low, close,
+                          BufferSlope, BufferSlopeColor, InpThreshold);
+
+   return(rates_total);
+  }
+//+------------------------------------------------------------------+
+//+------------------------------------------------------------------+