Help on indicator

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Hi, I would like to change this indicator. I would like to attach it to any chart but it has to work on the chosen market.
For example, I attack the indicator on the EUR / USD chart but I set the indicator on USD / JPY. Thank you all.


//+------------------------------------------------------------------+
//|                                                          MFI.mq5 |
//|                   Copyright 2009-2020, MetaQuotes Software Corp. |
//|                                              http://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright   "2009-2020, MetaQuotes Software Corp."
#property link        "http://www.mql5.com"
#property description "Money Flow Index"
//--- indicator settings
#property indicator_separate_window
#property indicator_buffers    1
#property indicator_plots      1
#property indicator_type1      DRAW_LINE
#property indicator_color1     DodgerBlue
#property indicator_maximum    100.0
#property indicator_minimum    0.0
#property indicator_level1     20.0
#property indicator_level2     80.0
#property indicator_levelcolor Silver
#property indicator_levelstyle 2
#property indicator_levelwidth 1
//--- input parameters
input int                 InpMFIPeriod=14;            // Period
input ENUM_APPLIED_VOLUME InpVolumeType=VOLUME_TICK;  // Volumes
//--- indicator buffer
double ExtMFIBuffer[];

int    ExtMFIPeriod;
//+------------------------------------------------------------------+
//| Money Flow Index initialization function                         |
//+------------------------------------------------------------------+
void OnInit()
  {
//--- check for input value
   if(InpMFIPeriod<=0)
     {
      ExtMFIPeriod=14;
      Print("Parameter InpMFIPeriod has wrong value. Indicator will use value ",ExtMFIPeriod);
     }
   else
      ExtMFIPeriod=InpMFIPeriod;
//--- indicator buffer
   SetIndexBuffer(0,ExtMFIBuffer);
//--- name for DataWindow and indicator subwindow label
   IndicatorSetString(INDICATOR_SHORTNAME,"MFI("+string(ExtMFIPeriod)+")");
//--- set draw begin
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,ExtMFIPeriod);
//--- set indicator digits
   IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
  }
//+------------------------------------------------------------------+
//| Money Flow Index                                                 |
//+------------------------------------------------------------------+
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[])
  {
   if(rates_total<ExtMFIPeriod)
      return(0);

   int start_position;
//--- start working
   if(prev_calculated<ExtMFIPeriod)
      start_position=ExtMFIPeriod;
   else
      start_position=prev_calculated-1;
//--- calculate MFI by volume
   if(InpVolumeType==VOLUME_TICK)
      CalculateMFI(start_position,rates_total,high,low,close,tick_volume);
   else
      CalculateMFI(start_position,rates_total,high,low,close,volume);
//--- OnCalculate done. Return new prev_calculated
   return(rates_total);
  }
//+------------------------------------------------------------------+
//| Calculate MFI by volume from argument                            |
//+------------------------------------------------------------------+
void CalculateMFI(const int start_position,
                  const int rates_total,
                  const double &high[],
                  const double &low[],
                  const double &close[],
                  const long &volume[])
  {
   for(int i=start_position; i<rates_total && !IsStopped(); i++)
     {
      double positive=0.0;
      double negative=0.0;
      double current_tp=TypicalPrice(high[i],low[i],close[i]);
      for(int j=1; j<=ExtMFIPeriod; j++)
        {
         int    index=i-j;
         double previous_tp=TypicalPrice(high[index],low[index],close[index]);
         if(current_tp>previous_tp)
            positive+=volume[index+1]*current_tp;
         if(current_tp<previous_tp)
            negative+=volume[index+1]*current_tp;
         current_tp=previous_tp;
        }
      if(negative!=0.0)
         ExtMFIBuffer[i]=100.0-100.0/(1+positive/negative);
      else
         ExtMFIBuffer[i]=100.0;
     }
  }
//+------------------------------------------------------------------+
//| Calculate typical price                                          |
//+------------------------------------------------------------------+
double TypicalPrice(const double high_price,const double low_price,const double close_price)
  {
   return((high_price+low_price+close_price)/3.0);
  }
//+------------------------------------------------------------------+
 
Andrea Pereira Souza Zampa: , I would like to change this indicator.

So do it. No one is stopping you. You haven't stated a problem, you stated a want. Show us your attempt (using the CODE button) and state the nature of your difficulty.
          No free help (2017)

Or pay someone. Top of every page is the link Freelance.
          Hiring to write script - General - MQL5 programming forum (2018)

We're not going to code it for you (although it could happen if you are lucky or the problem is interesting).
          No free help (2017)

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