//+------------------------------------------------------------------+
//|                                                      Bands M.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_chart_window
#property indicator_buffers 7
#property indicator_color1 White
#property indicator_color2 White
#property indicator_color3 White
#property indicator_color4 White
#property indicator_color5 White
#property indicator_color6 White
#property indicator_color7 White

#property indicator_width1 2

#property indicator_style1 0
#property indicator_style2 0
#property indicator_style3 0
#property indicator_style4 2
#property indicator_style5 2
#property indicator_style6 4
#property indicator_style7 4
//---- indicator parameters
int BandsPeriod=0;
extern ENUM_TIMEFRAMES TimeFrame = PERIOD_CURRENT;
extern int MA_Period = 60;
extern ENUM_MA_METHOD MA_Mode = MODE_EMA;
extern ENUM_APPLIED_PRICE Price_Type= PRICE_CLOSE;
extern int    BandsShift=0;
extern double BandsDeviations1=1.0;
extern double BandsDeviations2=0;
extern double BandsDeviations3=0;
//---- buffers
double MovingBuffer[];
double UpperBuffer1[];
double LowerBuffer1[];
double UpperBuffer2[];
double LowerBuffer2[];
double UpperBuffer3[];
double LowerBuffer3[];
double MovingBuffer1[];
string short_name;
string short_name1, short_name2, short_name3, short_name4, short_name5, short_name6;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//if (MA_Period != PERIOD_CURRENT  ) {
   int ActivePer = Period();
      if (ActivePer ==  10080) ActivePer =   7200;
      if (ActivePer ==  40320) ActivePer =  28800;
      if (ActivePer == 161280) ActivePer = 115200;
   BandsPeriod = MA_Period/ActivePer;
//}
//---- indicators
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,MovingBuffer);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,UpperBuffer1);
   SetIndexStyle(2,DRAW_LINE);
   SetIndexBuffer(2,LowerBuffer1);
   SetIndexStyle(3,DRAW_LINE);
   SetIndexBuffer(3,UpperBuffer2);
   SetIndexStyle(4,DRAW_LINE);
   SetIndexBuffer(4,LowerBuffer2);
   SetIndexStyle(5,DRAW_LINE);
   SetIndexBuffer(5,UpperBuffer3);
   SetIndexStyle(6,DRAW_LINE);
   SetIndexBuffer(6,LowerBuffer3);
//----
   SetIndexDrawBegin(0,BandsPeriod+BandsShift);
   SetIndexDrawBegin(1,BandsPeriod+BandsShift);
   SetIndexDrawBegin(2,BandsPeriod+BandsShift);
   SetIndexDrawBegin(3,BandsPeriod+BandsShift);
   SetIndexDrawBegin(4,BandsPeriod+BandsShift);
   SetIndexDrawBegin(5,BandsPeriod+BandsShift);
   SetIndexDrawBegin(6,BandsPeriod+BandsShift);

//---- name for DataWindow and indicator subwindow label
   short_name ="KG Bands( "+ BandsPeriod + ", " + IntegerToString(MA_Mode) + ", " + IntegerToString(Price_Type) + " )";
   short_name1="Upper Band (M"+BandsPeriod+","+BandsDeviations1+")";
   short_name2="Lower Band (M"+BandsPeriod+","+BandsDeviations1+")";
   short_name3="Upper Band (M"+BandsPeriod+","+BandsDeviations2+")";
   short_name4="Lower Band (M"+BandsPeriod+","+BandsDeviations2+")";
   short_name5="Upper Band (M"+BandsPeriod+","+BandsDeviations3+")";
   short_name6="Lower Band (M"+BandsPeriod+","+BandsDeviations3+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,short_name);
   SetIndexLabel(1,short_name1);
   SetIndexLabel(2,short_name2);
   SetIndexLabel(3,short_name3);
   SetIndexLabel(4,short_name4);
   SetIndexLabel(5,short_name5);
   SetIndexLabel(6,short_name6);
   return(0);
  }
//+------------------------------------------------------------------+
//| Bollinger Bands                                                  |
//+------------------------------------------------------------------+
int start()
  {
   int    i,k,counted_bars=IndicatorCounted();
   double sum,oldval,newres;

//----
   if(Bars<=BandsPeriod)
      return(0);
//---- initial zero
   if(counted_bars<1)
      for(i=1; i<=BandsPeriod; i++)
        {
         MovingBuffer[Bars-i]=EMPTY_VALUE;
         UpperBuffer1[Bars-i]=EMPTY_VALUE;
         LowerBuffer1[Bars-i]=EMPTY_VALUE;
         if(BandsDeviations2>0)
            UpperBuffer2[Bars-i]=EMPTY_VALUE;
         if(BandsDeviations2>0)
            LowerBuffer2[Bars-i]=EMPTY_VALUE;
         if(BandsDeviations3>0)
            UpperBuffer3[Bars-i]=EMPTY_VALUE;
         if(BandsDeviations3>0)
            LowerBuffer3[Bars-i]=EMPTY_VALUE;
        }
//----
   int limit=Bars-counted_bars;
   if(counted_bars>0)
      limit++;
   for(i=0; i<limit; i++)
      MovingBuffer[i]=iMA(NULL,TimeFrame, BandsPeriod,BandsShift,MA_Mode,Price_Type,i);

//----
   i=Bars-BandsPeriod+1;
   if(counted_bars>BandsPeriod-1)
      i=Bars-counted_bars-1;
   while(i>=0)
     {
      sum=0.0;
      k=i+BandsPeriod-1;
      oldval=MovingBuffer[i];
      while(k>=i)
        {
         newres=Close[k]-oldval;
         sum+=newres*newres;
         k--;
        }
      if(BandsDeviations1>0)
        {
         double deviation;
         deviation=BandsDeviations1*MathSqrt(sum/BandsPeriod);
         UpperBuffer1[i]=oldval+deviation;
         LowerBuffer1[i]=oldval-deviation;
        }
      if(BandsDeviations2>0)
        {
         double deviation2;
         deviation2=BandsDeviations2*MathSqrt(sum/BandsPeriod);
         UpperBuffer2[i]=oldval+deviation2;
         LowerBuffer2[i]=oldval-deviation2;
        }
      if(BandsDeviations3>0)
        {
         double deviation3;
         deviation3=BandsDeviations3*MathSqrt(sum/BandsPeriod);
         UpperBuffer3[i]=oldval+deviation3;
         LowerBuffer3[i]=oldval-deviation3;
        }
      i--;
     }
   return(0);
  }
//+------------------------------------------------------------------+
//+------------------------------------------------------------------+