//+------------------------------------------------------------------+
//|                                                        Bands.mq4 |
//|                      Copyright © 2005, MetaQuotes Software Corp. |
//|                                       http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net/"
 
#property indicator_chart_window
#property indicator_buffers 3
#property indicator_color1 LightSeaGreen
#property indicator_color2 LightSeaGreen
#property indicator_color3 LightSeaGreen
//---- indicator parameters
extern int    BandsPeriod=20;
extern int    BandsShift=0;
extern double BandsDeviations=2.0;
extern int a = 100;
extern int b = 50;
//extern int c = 50;
extern int d = 100;
extern int angle = 1;
extern color text_color_up = Green;
extern color text_color_down = Red;
//---- buffers
double MovingBuffer[];
double UpperBuffer[];
double LowerBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,MovingBuffer);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,UpperBuffer);
   SetIndexStyle(2,DRAW_LINE);
   SetIndexBuffer(2,LowerBuffer);
//----
   SetIndexDrawBegin(0,BandsPeriod+BandsShift);
   SetIndexDrawBegin(1,BandsPeriod+BandsShift);
   SetIndexDrawBegin(2,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);
//---- initial zero
   if(counted_bars<1)
      for(i=1;i<=BandsPeriod;i++)
        {
         MovingBuffer[Bars-i]=EMPTY_VALUE;
         UpperBuffer[Bars-i]=EMPTY_VALUE;
         LowerBuffer[Bars-i]=EMPTY_VALUE;
        }
//----
   int limit=Bars-counted_bars;
   if(counted_bars>0) limit++;
   for(i=0; i<limit; i++)
      MovingBuffer[i]=iMA(NULL,0,BandsPeriod,BandsShift,MODE_SMA,PRICE_CLOSE,i);
//----
   i=Bars-BandsPeriod;
   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--;
        }
      deviation=BandsDeviations*MathSqrt(sum/BandsPeriod);
      UpperBuffer[i]=oldval+deviation; //верхняя полоска
      LowerBuffer[i]=oldval-deviation; //нижняя полоска
      SetLabel("UPPER", DoubleToStr(UpperBuffer[i], Digits), text_color_up, a, b, angle);
      SetLabel("LOWER", DoubleToStr(LowerBuffer[i], Digits), text_color_down, a, d, angle);
      i--;
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+[/code]v
//+----------------------------------------------------------------------------+
//|  Автор    : Ким Игорь В. aka KimIV,  http://www.kimiv.ru                   |
//+----------------------------------------------------------------------------+
//|  Версия   : 12.10.2007                                                     |
//|  Описание : Установка текстовой метки, объект OBJ_LABEL.                   |
//+----------------------------------------------------------------------------+
//|  Параметры:                                                                |
//|    nm - наименование объекта                                               |
//|    tx - текст                                                              |
//|    cl - цвет метки                                                         |
//|    xd - координата X в пикселах                                            |
//|    yd - координата Y в пикселах                                            |
//|    cr - номер угла привязки        (0 - левый верхний,                     |
//|                                     1 - правый верхний,                    |
//|                                     2 - левый нижний,                      |
//|                                     3 - правый нижний )                    |
//|    fs - размер шрифта              (9 - по умолчанию  )                    |
//+----------------------------------------------------------------------------+
void SetLabel(string nm, string tx, color cl, int xd, int yd, int cr=0, int fs=9) {
  if (ObjectFind(nm)<0) ObjectCreate(nm, OBJ_LABEL, 0, 0,0);
  ObjectSetText(nm, tx, fs);
  ObjectSet(nm, OBJPROP_COLOR    , cl);
  ObjectSet(nm, OBJPROP_XDISTANCE, xd);
  ObjectSet(nm, OBJPROP_YDISTANCE, yd);
  ObjectSet(nm, OBJPROP_CORNER   , cr);
  ObjectSet(nm, OBJPROP_FONTSIZE , fs);
}
int deinit()
{
   ObjectDelete("UPPER");
   ObjectDelete("LOWER");
   return;
}