Article-16308-MQL5-Moving-Average-From-Scratch/EMA/EMAonPriceCloseRAW.mq5

<EFBFBD><EFBFBD>//+------------------------------------------------------------------+
//|                                           EMAonPriceCloseRAW.mq5 |
//|                                  Copyright 2024, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2024, MetaQuotes Ltd."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots   1
//--- plot MA
#property indicator_label1  "EMA"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrRed
#property indicator_style1  STYLE_SOLID
#property indicator_width1  1

//--- input parameters
input int      InpPeriod   =  10;   // EMA Period

//--- indicator buffers
double         MABuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   SetIndexBuffer(0,MABuffer,INDICATOR_DATA);
   
//--- CA?5H=0O 8=8F80;870F8O
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| 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[])
  {
//--- 2 F8:;5 >B =C;O (=0G0;> 8AB>@88) 4> B5:CI53> 10@0
   for(int i=0; i<rates_total; i++)
     {
      double result=0;
      double smf=2.0/(InpPeriod+1.0);                       // D0:B>@ A3;06820=8O
      double prev_value=(i>=1 ? MABuffer[i-1] : close[i]);  // ?@54K4CI55 @0AAG8B0==>5 7=0G5=85 EMA
      
      //--- @0AAG8BK205< EMA =0 >A=>20=88 F5=K Close 10@0, ?@>H;>3> 7=0G5=8O EMA 8 D0:B>@0 A3;06820=8O
      result=close[i]*smf+prev_value*(1-smf);
      
      //--- 0?8AK205< @57C;LB0B @0AGQB0 2 1CD5@
      MABuffer[i]=result;
     }
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+