//+------------------------------------------------------------------+
//|                                          LWMAonPriceCloseRAW.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  "LWMA"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrRed
#property indicator_style1  STYLE_SOLID
#property indicator_width1  1
//--- input parameters
input int      InpPeriod=10;  // LWMA Period
//--- indicator buffers
double         MABuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   SetIndexBuffer(0,MABuffer,INDICATOR_DATA);
   
//---
   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[])
  {
//--- в цикле от InpPeriod-1 до текущего бара
   double result=0.0;
   for(int i=InpPeriod-1; i<rates_total; i++)
     {
      //--- рассчитываем веса (wsum) и сумму весовых коэффициентов (sum) InpPeriod баров
      double sum =0.0;
      int    wsum=0;
      for(int j=InpPeriod; j>0; j--)
        {
         wsum+=j;
         sum +=close[i-j+1]*(InpPeriod-j+1);
        }
      //--- получаем значение LWMA для текущего бара цикла
      result=sum/wsum;
      //--- Записываем результат расчёта в буфер
      MABuffer[i]=result;
     }
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+