код скрипта на ТВ:

//+------------------------------------------------------------------+
//|                                                    BBProcent.mq4 |
//|                        Copyright 2017, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2017, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict
#property indicator_separate_window

#property indicator_buffers 3

#property indicator_color1 Green
#property indicator_color2 Green
#property indicator_color3 Red

input int    MAPeriod=8;       // MA Period
input int    BBPeriod=20;      // Bands Period
input int    BBShift=0;        // Bands Shift
input double BBDeviations=2.0; // Bands Deviations

double up[];
double dn[];
double ma[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,up);
//--- upper band
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,dn);
//--- lower band
   SetIndexStyle(2,DRAW_LINE);
   SetIndexBuffer(2,ma);
//---
   return(INIT_SUCCEEDED);
  }
  //+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
double GetAppliedPrice(int nAppliedPrice, int nIndex)
  {
   double dPrice;
//----
   switch(nAppliedPrice)
     {
      case 0:  dPrice=Close[nIndex];                                  break;
      case 1:  dPrice=Open[nIndex];                                   break;
      case 2:  dPrice=High[nIndex];                                   break;
      case 3:  dPrice=Low[nIndex];                                    break;
      case 4:  dPrice=(High[nIndex]+Low[nIndex])/2.0;                 break;
      case 5:  dPrice=(High[nIndex]+Low[nIndex]+Close[nIndex])/3.0;   break;
      case 6:  dPrice=(High[nIndex]+Low[nIndex]+2*Close[nIndex])/4.0; break;
      default: dPrice=0.0;
     }
//----
   return(dPrice);
  }
//+------------------------------------------------------------------+
//| 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[])
  {
//---
   for(int i=0;i<1000;i++)
     {
      double bup=iBands(NULL,0,BBPeriod,BBDeviations,BBShift,0,1,i);
      double bdn=iBands(NULL,0,BBPeriod,BBDeviations,BBShift,0,2,i);
      ma[i]=iMA(NULL,0,MAPeriod,0,0,0,i);
      up[i]=bup;
      dn[i]=bdn;
      //ma[i]=(Close[i]-bdn)/(bup-bdn);
     }
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+