//+------------------------------------------------------------------+
//|                                                        Bands.mq4 |
//|                             Copyright (c) 2009, Plamo-Bite Corp. |
//|                                     http://fx7-signal.com/store/ |
//+------------------------------------------------------------------+
#property copyright "Copyright (c) 2009, Plamo-Bite Corp."
#property link      "http://fx7-signal.com/store/"

#property indicator_separate_window
#property indicator_buffers 4
#property indicator_color1 White

//---- indicator parameters
extern int    BandsPeriod=20;
extern int    BandsShift=0;
extern double BandsDeviations=2.0;
//---- buffers
double MovingBuffer[];
double UpperBuffer[];
double LowerBuffer[];
double GapBuffer[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexBuffer(0,GapBuffer);
   SetIndexStyle(0,DRAW_HISTOGRAM,STYLE_SOLID,2);

//----
   SetIndexDrawBegin(0,BandsPeriod+BandsShift);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Bollinger Bands                                                  |
//+------------------------------------------------------------------+
int start()
  {
   int    i,k,counted_bars=IndicatorCounted();
   double deviation;
   double sum,oldval,newres;
//----
   if(Bars<=BandsPeriod) return(0);
   int limit=Bars-counted_bars;
   
   for(i=limit-1;i>=0;i--){  
         GapBuffer[i]=iBands(NULL,0,BandsPeriod,BandsDeviations,BandsShift,PRICE_CLOSE,MODE_UPPER,i)-iBands(NULL,0,BandsPeriod,BandsDeviations,BandsShift,PRICE_CLOSE,MODE_LOWER,i);
   }
   
   
//----
   return(0);
  }
//+--------------------------------------------------