mql5/Indicators/MyIndicators/StochasticSlow_Pro.mq5

//+------------------------------------------------------------------+
//|                                           StochasticSlow_Pro.mq5 |
//|                                          Copyright 2025, xxxxxxxx|
//+------------------------------------------------------------------+
#property copyright "Copyright 2025, xxxxxxxx"
#property version   "2.10" // Optimized for incremental calculation
#property description "Professional Slow Stochastic with selectable MA types and"
#property description "candle source (Standard or Heikin Ashi)."

//--- Indicator Window and Plot Properties ---
#property indicator_separate_window
#property indicator_buffers 2 // %K and %D
#property indicator_plots   2
#property indicator_level1 20.0
#property indicator_level2 50.0
#property indicator_level3 80.0
#property indicator_minimum 0.0
#property indicator_maximum 100.0

//--- Plot 1: %K line
#property indicator_label1  "%K"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrLightSeaGreen
#property indicator_style1  STYLE_SOLID
#property indicator_width1  1

//--- Plot 2: %D line
#property indicator_label2  "%D"
#property indicator_type2   DRAW_LINE
#property indicator_color2  clrLightCoral
#property indicator_style2  STYLE_SOLID
#property indicator_width2  1

//--- Include the calculator engine ---
#include <MyIncludes\StochasticSlow_Calculator.mqh>

//--- Enum for selecting the candle source for calculation ---
enum ENUM_CANDLE_SOURCE
  {
   CANDLE_STANDARD,      // Use standard OHLC data
   CANDLE_HEIKIN_ASHI    // Use Heikin Ashi smoothed data
  };

//--- Input Parameters ---
input int                InpKPeriod       = 5;
input int                InpSlowingPeriod = 3;
input ENUM_MA_METHOD     InpSlowingMAType = MODE_SMA;
input int                InpDPeriod       = 3;
input ENUM_MA_METHOD     InpDMAType       = MODE_SMA;
input ENUM_CANDLE_SOURCE InpCandleSource  = CANDLE_STANDARD;

//--- Indicator Buffers ---
double    BufferK[];
double    BufferD[];

//--- Global calculator object (as a base class pointer) ---
CStochasticSlowCalculator *g_calculator;

//+------------------------------------------------------------------+
//| Custom indicator initialization function.                        |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- Map the buffers and set as non-timeseries
   SetIndexBuffer(0, BufferK, INDICATOR_DATA);
   SetIndexBuffer(1, BufferD, INDICATOR_DATA);
   ArraySetAsSeries(BufferK, false);
   ArraySetAsSeries(BufferD, false);

//--- Dynamically create the appropriate calculator instance
   switch(InpCandleSource)
     {
      case CANDLE_HEIKIN_ASHI:
         g_calculator = new CStochasticSlowCalculator_HA();
         IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("SlowStoch HA(%d,%d,%d)", InpKPeriod, InpSlowingPeriod, InpDPeriod));
         break;
      default: // CANDLE_STANDARD
         g_calculator = new CStochasticSlowCalculator();
         IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("SlowStoch(%d,%d,%d)", InpKPeriod, InpSlowingPeriod, InpDPeriod));
         break;
     }

//--- Check if creation was successful and initialize
   if(CheckPointer(g_calculator) == POINTER_INVALID || !g_calculator.Init(InpKPeriod, InpSlowingPeriod, InpSlowingMAType, InpDPeriod, InpDMAType))
     {
      Print("Failed to create or initialize Slow Stochastic Calculator object.");
      return(INIT_FAILED);
     }

//--- Set indicator display properties
   IndicatorSetInteger(INDICATOR_DIGITS, 2);
   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, InpKPeriod + InpSlowingPeriod - 2);
   PlotIndexSetInteger(1, PLOT_DRAW_BEGIN, InpKPeriod + InpSlowingPeriod + InpDPeriod - 3);

   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 calculation function                            |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated, // <--- Now used!
                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)
      return 0;

//--- Delegate calculation with prev_calculated optimization
   g_calculator.Calculate(rates_total, prev_calculated, open, high, low, close, BufferK, BufferD);

   return(rates_total);
  }
//+------------------------------------------------------------------+
//+------------------------------------------------------------------+