old indicator

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//+------------------------------------------------------------------+
//|                                                       iTrend.mq4 |
//|                      Copyright © 2004, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"

#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 LimeGreen
#property indicator_color2 Red
//---- input parameters
extern int Bands_Mode_0_2=0;  // =0-2 MODE_MAIN, MODE_LOW, MODE_HIGH
extern int Power_Price_0_6=0; // =0-6 PRICE_CLOSE,PRICE_OPEN,PRICE_HIGH,PRICE_LOW,PRICE_MEDIAN,PRICE_TYPICAL,PRICE_WEIGHTED
extern int Price_Type_0_3=0;  // =0-3 PRICE_CLOSE,PRICE_OPEN,PRICE_HIGH,PRICE_LOW
extern int Bands_Period=20;
extern int Bands_Deviation=2;
extern int Power_Period=13;
extern int CountBars=300;
//---- buffers
double value[];
double value2[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//   string short_name;
//---- indicator line
   IndicatorBuffers(2);
   SetIndexStyle(0,DRAW_LINE);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(0,value);
   SetIndexBuffer(1,value2);
//----

//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Trend                                                         |
//+------------------------------------------------------------------+
int start()
  {
   SetIndexDrawBegin(0,Bars-CountBars+Bands_Period+1);
   SetIndexDrawBegin(1,Bars-CountBars+Bands_Period+1);
   int i,CurrentBar,Bands_Mode,counted_bars=IndicatorCounted();
   double Power_Price,CurrentPrice;
//----
   if(Bars<=Bands_Period) return(0);
//---- initial zero
   if(counted_bars<Bands_Period)
   {
      for(i=1;i<=Bands_Period;i++) value[Bars-i]=0.0;
      for(i=1;i<=Bands_Period;i++) value2[Bars-i]=0.0;
   }
//----
   i=CountBars-Bands_Period-1;
//   if(counted_bars>=Bands_Period) i=Bars-counted_bars-1;

     
if (Bands_Mode_0_2==1) Bands_Mode=MODE_LOW;
if (Bands_Mode_0_2==2) Bands_Mode=MODE_HIGH;
if (Bands_Mode_0_2==0) Bands_Mode=MODE_MAIN;

if (Power_Price_0_6==1) Power_Price=PRICE_OPEN;
if (Power_Price_0_6==2) Power_Price=PRICE_HIGH;
if (Power_Price_0_6==3) Power_Price=PRICE_LOW;
if (Power_Price_0_6==4) Power_Price=PRICE_MEDIAN;
if (Power_Price_0_6==5) Power_Price=PRICE_TYPICAL;
if (Power_Price_0_6==6) Power_Price=PRICE_WEIGHTED;
if (Power_Price_0_6==0) Power_Price=PRICE_CLOSE;

for (i=CountBars-1; i>=0; i--)
{  
  if (Price_Type_0_3==1) CurrentPrice=Open[i];
  
  if (Price_Type_0_3==2) CurrentPrice=High[i];

  if (Price_Type_0_3==3) CurrentPrice=Low[i];
  if (Price_Type_0_3==0) CurrentPrice=Close[i]; 
     
  value[i]=CurrentPrice-iBands(NULL,0,Bands_Period,Bands_Deviation,0,Bands_Mode,Power_Price,i);
  value2[i]=-(iBearsPower(NULL,0,Power_Period,Power_Price,i)+iBullsPower(NULL,0,Power_Period,Power_Price,i)); 

}  


   return(0);
  }
//+------------------------------------------------------------------+

how do we make old mt4 indicator   which does not have oncalculate function   to work in mt5   in mt4 it works

 
budak0: how do we make old mt4 indicator which does not have oncalculate function   to work in mt5   in mt4 it works
By rewriting the code so that it becomes compatible with both MQL4+ an MQL5.
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