//+------------------------------------------------------------------+
//|                                               KeltnerChannel.mq4 |
//|                                                    by SullyForex |
 //////////////////////                                 October 2015 |
//|                      Copyright © 2012, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2012, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
#property indicator_chart_window
#property indicator_buffers 3
#property indicator_color1 Red
#property indicator_color2 Yellow
#property indicator_color3 DodgerBlue


double upper[], middle[], lower[];
extern int     HalfLength = 48;
extern int     Price = 0;
extern int     ATRPeriod = 100;
extern double  ATRMultiplier = 2.0;

int init()
  {
   SetIndexStyle(0,DRAW_LINE);
   SetIndexShift(0,0);
   SetIndexDrawBegin(0,0);
   SetIndexBuffer(0,upper);

   SetIndexStyle(1,DRAW_LINE,STYLE_DOT);
   SetIndexShift(1,0);
   SetIndexDrawBegin(1,0);
   SetIndexBuffer(1,middle);

   SetIndexStyle(2,DRAW_LINE);
   SetIndexShift(2,0);
   SetIndexDrawBegin(2,0);
   SetIndexBuffer(2,lower);
    

//---- indicators
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//---- TODO: add your code here
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start() {
   int limit;
   int counted_bars=IndicatorCounted();
   if(counted_bars<0) return(-1);
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
   
   double avg;
   
   for(int x=0; x<limit; x++) {
      
      middle[x] = iMA(NULL, 0, HalfLength+1 , 0, 3, Price, x);
      
      avg  = iATR(NULL,0,ATRPeriod, x+10);

      upper[x] = middle[x] + ATRMultiplier*avg;
      lower[x] = middle[x] - ATRMultiplier*avg;
   }
   return(0);
  }