//+------------------------------------------------------------------+
//|                                                  Heiken Ashi.mq4 |
//|                      Copyright c 2004, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
//| For Heiken Ashi we recommend next chart settings ( press F8 or   |
//| select on menu 'Charts'->'Properties...'):                       |
//|  - On 'Color' Tab select 'Black' for 'Line Graph'                |
//|  - On 'Common' Tab disable 'Chart on Foreground' checkbox and    |
//|    select 'Line Chart' radiobutton                               |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"

#property indicator_chart_window
#property indicator_buffers 4
#property indicator_color1 Red
#property indicator_color2 White
#property indicator_color3 Red
#property indicator_color4 White
#property indicator_width1 1
#property indicator_width2 1
#property indicator_width3 2
#property indicator_width4 2

//----
extern int CountBar=1;  // Количество баров для расчета цены открытия
extern int mode=0;      // выбор варианта расчета цены закрытия
                        // (mode==0)   haClose=(High[pos]+Low[pos]+Close[pos])/3.0;
// (mode==1)   haClose=(High[pos]+Low[pos]+Close[pos]+Open[pos])/4.0;

//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
double ExtMapBuffer3[];
double ExtMapBuffer4[];
//----
int ExtCountedBars=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//|------------------------------------------------------------------|
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_HISTOGRAM,0,1);
   SetIndexBuffer(0,ExtMapBuffer1);
   SetIndexStyle(1,DRAW_HISTOGRAM,0,1);
   SetIndexBuffer(1,ExtMapBuffer2);
   SetIndexStyle(2,DRAW_HISTOGRAM,0,2);
   SetIndexBuffer(2,ExtMapBuffer3);
   SetIndexStyle(3,DRAW_HISTOGRAM,0,2);
   SetIndexBuffer(3,ExtMapBuffer4);

   SetIndexBuffer(0,ExtMapBuffer1);
   SetIndexBuffer(1,ExtMapBuffer2);
   SetIndexBuffer(2,ExtMapBuffer3);
   SetIndexBuffer(3,ExtMapBuffer4);
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//---- TODO: add your code here

//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   double haOpen,haHigh,haLow,haClose;
   double _Open,_High,_Low,_Close;
   int shift;
   if(Bars<=10) return(0);
   int counted_bars=IndicatorCounted();
   if(counted_bars<0) return(-1);
   if(counted_bars>0) counted_bars--;
   int limit=Bars-counted_bars;
   if(counted_bars==0) limit-=1+CountBar;
   int pos=limit;
   while(pos>=0)
     {
      haOpen=0;
      for(int i=1;i<=CountBar;i++)
        {
         haOpen+=((ExtMapBuffer3[pos+i]+ExtMapBuffer4[pos+i])/2.0);
        }
      haOpen/= (CountBar*1.0);
      if(mode==0) haClose=(High[pos]+Low[pos]+Close[pos])/3.0;
      else haClose=(High[pos]+Low[pos]+Close[pos]+Open[pos])/4.0;
      haHigh=MathMax(High[pos],MathMax(haOpen,haClose));
      haLow=MathMin(Low[pos],MathMin(haOpen,haClose));
      if(haOpen<haClose)
        {
         ExtMapBuffer1[pos]=haLow;
         ExtMapBuffer2[pos]=haHigh;
        }
      else
        {
         ExtMapBuffer1[pos]=haHigh;
         ExtMapBuffer2[pos]=haLow;
        }
      ExtMapBuffer3[pos]=haOpen;
      ExtMapBuffer4[pos]=haClose;
      pos--;
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+