//+------------------------------------------------------------------+
//|                                         Bars - H-L excursion.mq4 |
//|                               Copyright © 2010, PDSoftware Corp. |
//| Visualizza l'escursione tra Open e Close delle Bars in Pips      |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2010, PDSoftware 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);
   string short_name = "Bars - O-C excursion (Pips): ";
   IndicatorShortName(short_name);

   SetLevelValue(1,10);
   //SetLevelValue(2,20);
   SetLevelValue(3,30);
   //SetLevelValue(10,100);   

   SetLevelValue(4,-10);
   //SetLevelValue(5,-20);
   SetLevelValue(6,-30);
   //SetLevelValue(11,-100);   
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    counted_bars=IndicatorCounted();
   
   //---- check for possible errors
   if (counted_bars<0) return(-1);
   
   //---- last counted bar will be recounted
   if (counted_bars>0) counted_bars--;
   int pos=Bars-counted_bars;
   double dHigh , dLow , dResult;
   
   
   //---- main calculation loop
   while(pos>=0)
      {
         dHigh = Open[pos];
         dLow = Close[pos];
         dResult = (dHigh - dLow)/Point;
         ExtMapBuffer1[pos]= dResult ;
         pos--;
      }

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