//+------------------------------------------------------------------+
//|                                                     VolIndex.mq4 |
//|                      Copyright © 2008, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2008, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"

#property indicator_separate_window
#property indicator_buffers 1
#property indicator_color1 Red
//---- buffers
double ExtMapBuffer1[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,ExtMapBuffer1);
//----
   IndicatorShortName("VI");

   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int i,counted_bars=IndicatorCounted();
//----
   i=Bars-counted_bars-1;
   while(i>=0)
     {
      double high =High[i];
      double low  =Low[i];
      double open =Open[i];
      double close=Close[i];
      double diff = (high - low);
      double diffVolume = Volume[i];
      if(diff != 0){
            ExtMapBuffer1[i] =  diffVolume / diff;
       }
       else{
        ExtMapBuffer1[i] = 0;
       }
      i--;
     }
   return(0);
  }
//+------------------------------------------------------------------+