Heiken Ashi Real Alerts

//+------------------------------------------------------------------+
//|                                                  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 6
#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 3
#property indicator_width4 3
#property indicator_color5 DodgerBlue
#property indicator_color6 Crimson

//----
extern color color1       = Red;
extern color color2       = White;
extern color color3       = Red;
extern color color4       = White; 
extern color uparrowcolor = DodgerBlue;
extern color dnarrowcolor = Crimson; 
extern int   arrowwidth   = 3;
extern bool  Alerts       = true;

//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
double ExtMapBuffer3[];
double ExtMapBuffer4[];
double UpArrow[];
double DnArrow[];
//----
int ExtCountedBars = 0;

static bool TurnedUp   = false;
static bool TurnedDown = false;
datetime    timeprev   = 0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//|------------------------------------------------------------------|
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_NONE, 0, 1, color1);
   SetIndexBuffer(0, ExtMapBuffer1);
   SetIndexStyle(1,DRAW_NONE, 0, 1, color2);
   SetIndexBuffer(1, ExtMapBuffer2);
   SetIndexStyle(2,DRAW_LINE, 0, 2, color3);
   SetIndexBuffer(2, ExtMapBuffer3);
   SetIndexStyle(3,DRAW_LINE, 0, 2, color4);
   SetIndexBuffer(3, ExtMapBuffer4);
//----
   SetIndexDrawBegin(0,10);
   SetIndexDrawBegin(1,10);
   SetIndexDrawBegin(2,10);
   SetIndexDrawBegin(3,10);
//---- indicator buffers mapping
   SetIndexBuffer(0,ExtMapBuffer1);
   SetIndexBuffer(1,ExtMapBuffer2);
   SetIndexBuffer(2,ExtMapBuffer3);
   SetIndexBuffer(3,ExtMapBuffer4);
   
   SetIndexBuffer(4, UpArrow); SetIndexStyle(4,DRAW_ARROW,EMPTY,arrowwidth,uparrowcolor); SetIndexArrow(4,241);
   SetIndexBuffer(5, DnArrow); SetIndexStyle(5,DRAW_ARROW,EMPTY,arrowwidth,dnarrowcolor); SetIndexArrow(5,242);
//---- 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;
   if(Bars<=10) return(0);
   ExtCountedBars=IndicatorCounted();
//---- check for possible errors
   if (ExtCountedBars<0) return(-1);
//---- last counted bar will be recounted
   if (ExtCountedBars>0) ExtCountedBars--;
   int pos=Bars-ExtCountedBars-1;
   while(pos>=0)
     {
      haOpen=(ExtMapBuffer3[pos+1]+ExtMapBuffer4[pos+1])/2;
      haClose=(Open[pos]+High[pos]+Low[pos]+Close[pos])/4;
      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;
 	   if (Alerts==true)
        {
         UpArrow[pos]=EMPTY_VALUE; DnArrow[pos]=EMPTY_VALUE;
         if (ExtMapBuffer3[pos]<ExtMapBuffer4[pos] && ExtMapBuffer4[pos+1]<ExtMapBuffer3[pos+1])
           {
            UpArrow[pos]=ExtMapBuffer4[pos+1]-(Ask-Bid);
            if (UpArrow[0]!=EMPTY_VALUE && TurnedUp==false)
              {
               Alert("HA Real  BUY:  ",Symbol()," - ",Period(),"  at  ", Close[0],"  -  ", TimeToStr(CurTime(),TIME_SECONDS));
               TurnedDown =false;
               TurnedUp   =true;
              }
           }
         if (ExtMapBuffer3[pos]>ExtMapBuffer4[pos] && ExtMapBuffer4[pos+1]>ExtMapBuffer3[pos+1])
           {
            DnArrow[pos]=ExtMapBuffer4[pos+1]+(Ask-Bid);
            if (DnArrow[0]!=EMPTY_VALUE && TurnedDown==false)
              {
               Alert("HA Real SELL:  ",Symbol()," - ",Period(),"  at  ", Close[0],"  -  ", TimeToStr(CurTime(),TIME_SECONDS));
               TurnedUp   =false;
               TurnedDown =true;
              }
           }
        }
 	   //------------
 	   pos--;
     }
   return(0);
  }