This is the code for mt4, requesting for ctrader version. Thanks

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#property copyright "Copyright © 2018, Gehtsoft USA LLC"

#property link      "http://fxcodebase.com"

#property version   "1.0"

#property strict

string IndicatorName = "Timed ZeroLag Envelope";

enum BandWidthUnitsType

{

   BandWidthUnitsPr, // %

   BandWidthUnitsPips // Pips

};

extern int Duration = 60; // MA Duration in seconds

extern double BandWidth = 25; // Band Width

extern BandWidthUnitsType BandWidthUnits = BandWidthUnitsPr; // Band Width Units

#property indicator_chart_window

#property indicator_buffers 4

#property indicator_color1 Green

#property indicator_color2 Red

#property indicator_color3 Blue

#property indicator_label1 "Bottom"

#property indicator_label2 "Top"

#property indicator_label3 "ZeroLag"

double top[], bottom[], ZeroLag[], ema[];

int init()

{

   IndicatorShortName(IndicatorName);

   IndicatorDigits(Digits);

   SetIndexStyle(0, DRAW_LINE);

   SetIndexBuffer(0, top);

   SetIndexStyle(1, DRAW_LINE);

   SetIndexBuffer(1, bottom);

   SetIndexStyle(2, DRAW_LINE);

   SetIndexBuffer(2, ZeroLag);

   SetIndexStyle(3, DRAW_NONE);

   SetIndexBuffer(3, ema);

   return 0;

}

int deinit()

{

   return 0;

}

int start()

{

   if (Bars <= 1)

      return(0);

   int ExtCountedBars = IndicatorCounted();

   if (ExtCountedBars < 0)

      return(-1);

   int limit = Bars - 1;

   if(ExtCountedBars > 1)

      limit = Bars - ExtCountedBars - 1;

   int pos = limit;

   int mult = SymbolInfoInteger(_Symbol, SYMBOL_DIGITS) % 2 == 1 ? 10 : 1;

   double pipSize = SymbolInfoDouble(_Symbol, SYMBOL_POINT) * mult;

   while (pos >= 0)

   {

      int P1 = iBarShift(_Symbol, _Period, Time[pos] - Duration);

      ema[pos] = calculateEMA(P1, pos);

      ZeroLag[pos] = calculateZeroLag(P1, pos);

      if (BandWidthUnits == BandWidthUnitsPr)

      {

         double Delta =  ZeroLag[pos] * BandWidth / 10000;

         top[pos] =  ZeroLag[pos] + Delta;

         bottom[pos] =  ZeroLag[pos] - Delta;

      }

      else

      {

         top[pos] =  ZeroLag[pos] + BandWidth * pipSize;

         bottom[pos] =  ZeroLag[pos] - BandWidth * pipSize;

      }

      pos--;

   } 

   return 0;

}

double calculateZeroLag(int p, int period)

{

int n = period + p;

if (n >= Bars)

      return Close[period];

   else

   {

      double k = 2.0 / (period + 1);

      double x = (period - 1) / 2;

      return k * (2 * Close[period] - Close[(int)(period + x)]) + (1 - k) * ema[period + 1];       

   }

}

double calculateEMA(int p, int period)

{

int n = period + p;

if (n >= Bars)

      return Close[period];

   else

   {

double k = 2.0 / (n + 1.0);

      return (1 - k) * ema[period + 1] + k * Close[period];

   }

}