//+------------------------------------------------------------------+
//|                                                           BB.mq4 |
//|                                              Copyright 2016, AM2 |
//|                                      http://www.forexsystems.biz |
//+------------------------------------------------------------------+
#property copyright "Copyright 2016, AM2"
#property link      "http://www.forexsystems.biz"
#property version   "1.00"
#property strict
#property indicator_chart_window

input int BBPeriod1 = 20;
input int BBPeriod2 = 20;
input int BBPeriod3 = 20;

input int BBTF1 = 0;
input int BBTF2 = 30;
input int BBTF3 = 60;

input double BBDev = 2;

#property indicator_buffers 9
#property indicator_color1 Red
#property indicator_color2 Blue
#property indicator_color3 Lime
#property indicator_color4 Red
#property indicator_color5 Blue
#property indicator_color6 Lime
#property indicator_color7 Red
#property indicator_color8 Blue
#property indicator_color9 Lime

double up1[];
double up2[];
double up3[];
double dn1[];
double dn2[];
double dn3[];
double md1[];
double md2[];
double md3[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping

//--- upper band
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,up1);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,up2);
   SetIndexStyle(2,DRAW_LINE);
   SetIndexBuffer(2,up3);
/*--- lower ban*/
   SetIndexStyle(3,DRAW_LINE);
   SetIndexBuffer(3,dn1);
   SetIndexStyle(4,DRAW_LINE);
   SetIndexBuffer(4,dn2);
   SetIndexStyle(5,DRAW_LINE);
   SetIndexBuffer(5,dn3);
//--- middle lined
   SetIndexStyle(6,DRAW_LINE);
   SetIndexBuffer(6,md1);
   SetIndexStyle(7,DRAW_LINE);
   SetIndexBuffer(7,md2);
   SetIndexStyle(8,DRAW_LINE);
   SetIndexBuffer(8,md3);

   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
//---
   for(int i=0; i<5555; i++)
     {
      up1[i]=iBands(NULL,BBTF1,BBPeriod1,BBDev,0,0,1,i);
      dn1[i]=iBands(NULL,BBTF1,BBPeriod1,BBDev,0,0,2,i);
      md1[i]=iBands(NULL,BBTF1,BBPeriod1,BBDev,0,0,0,i);
      
      up2[i]=iBands(NULL,BBTF2,BBPeriod2,BBDev,0,0,1,i);
      dn2[i]=iBands(NULL,BBTF2,BBPeriod2,BBDev,0,0,2,i);
      md2[i]=iBands(NULL,BBTF2,BBPeriod2,BBDev,0,0,0,i);
      
      up3[i]=iBands(NULL,BBTF3,BBPeriod3,BBDev,0,0,1,i);
      dn3[i]=iBands(NULL,BBTF3,BBPeriod3,BBDev,0,0,2,i);
      md3[i]=iBands(NULL,BBTF3,BBPeriod3,BBDev,0,0,0,i);            
     }
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+