//+------------------------------------------------------------------+
//|                                                         OsMA.mq4 |
//|                      Copyright © 2004, MetaQuotes Software Corp. |
//|        Modified by Cobraforex for THV System, www.cobraforex.com |
//|                                    Copyright © 2006, Robert Hill |
//|                                    Copyright © 2008, Linuxser    |
//+------------------------------------------------------------------+
#property  copyright "Copyright © 2006, Robert Hill"
#property  copyright "Copyright © 2008, Linuxser and Forex-TSD"
#property  link      "http://www.metaquotes.net/"
//---- indicator settings
#property  indicator_separate_window
#property  indicator_buffers 2
#property  indicator_color1  LimeGreen
#property  indicator_color2  FireBrick

//---- indicator parameters
extern bool SoundON=false;
extern bool EmailON=false;
extern bool HistogramAlarm=false;
extern bool ZeroLineAlarm=false;
extern int FastEMA=12;
extern int SlowEMA=26;
extern int SignalSMA=7;

//---- indicator buffers
double     OsmaBuffer[];
double     MacdBuffer[];
double     SignalBuffer[];
double HistogramBufferUp[];
double HistogramBufferDown[];
bool HistAboveZero = false;
bool HistBelowZero = false;
bool MACDAboveZero = false;
bool MACDBelowZero = false;

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- 2 additional buffers are used for counting.
   IndicatorBuffers(5);
//---- drawing settings
   SetIndexDrawBegin(0,SignalSMA);
   SetIndexStyle(0,DRAW_HISTOGRAM,STYLE_SOLID);
   SetIndexBuffer(0,HistogramBufferUp);
   SetIndexStyle(1,DRAW_HISTOGRAM,STYLE_SOLID);
   SetIndexBuffer(1,HistogramBufferDown);
   IndicatorDigits(Digits+2);
//---- 3 indicator buffers mapping
   SetIndexBuffer(2,OsmaBuffer);
   SetIndexBuffer(3,MacdBuffer);
   SetIndexBuffer(4,SignalBuffer);
   SetIndexBuffer(0,HistogramBufferUp);
   SetIndexBuffer(1,HistogramBufferDown);
   
//---- name for DataWindow and indicator subwindow label
   IndicatorShortName("OsMA("+FastEMA+","+SlowEMA+","+SignalSMA+")");
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//| Moving Average of Oscillator                                     |
//+------------------------------------------------------------------+
int start()
  {

   double current, prev;
   int limit;
   int counted_bars=IndicatorCounted();
//---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
//---- macd counted in the 1-st additional buffer
   for(int i=0; i<limit; i++)
      MacdBuffer[i]=iMA(NULL,0,FastEMA,0,MODE_EMA,PRICE_CLOSE,i)-iMA(NULL,0,SlowEMA,0,MODE_EMA,PRICE_CLOSE,i);
//---- signal line counted in the 2-nd additional buffer
   for(i=0; i<limit; i++)
      SignalBuffer[i]=iMAOnArray(MacdBuffer,Bars,SignalSMA,0,MODE_SMA,i);
//---- main loop
   for(i=0; i<limit; i++)
      OsmaBuffer[i]=MacdBuffer[i]-SignalBuffer[i];

   for(i=0; i<limit; i++)
   {
      HistogramBufferUp[i] = 0;
      HistogramBufferDown[i] = 0;
      current = MacdBuffer[i] - SignalBuffer[i];
      prev = MacdBuffer[i+1] - SignalBuffer[i+1];
      if (current > prev)
      {
        HistogramBufferUp[i] = current;
        HistogramBufferDown[i] = 0.0;
      }
      else
      {
        HistogramBufferDown[i] = current;
        HistogramBufferUp[i] = 0.0;
      }
      
      if (MACDAboveZero) Comment ("\nThe trend has changed to UP");
      if (MACDBelowZero) Comment ("\nThe trend has changed to DOWN");
      
      if (i == 1)
      {
// Check for Histogram Change Color
        if  (HistogramAlarm==true)
        {
        if (HistogramBufferUp[i] > HistogramBufferDown[i + 1])
        {
// Cross up
         if (HistAboveZero == false)
         {
           HistAboveZero=true;
           HistBelowZero=false;
           if (SoundON) Alert("OSMA is Positive","\n Time=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
           if (EmailON) SendMail("OSMA is Positive", "MACD Crossed up, Date="+TimeToStr(CurTime(),TIME_DATE)+" "+TimeHour(CurTime())+":"+TimeMinute(CurTime())+" Symbol="+Symbol()+" Period="+Period());
         }
        }
        else if (HistogramBufferDown[i] <  HistogramBufferUp[i + 1] > 0)
        {
// Cross down
         if (HistBelowZero == false)
         {
          HistBelowZero=true;
          HistAboveZero=false;
          if (SoundON) Alert("OSMA is Negative","\n Date=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
          if (EmailON) SendMail("OSMA is Negative","MACD Crossed Down, Date="+TimeToStr(CurTime(),TIME_DATE)+" "+TimeHour(CurTime())+":"+TimeMinute(CurTime())+" Symbol="+Symbol()+" Period="+Period());
         }
        }
        }
// Check for MACD Signal line crossing 0 line
        if (ZeroLineAlarm==true)
        {
        if (OsmaBuffer[i] > 0 && OsmaBuffer[i + 1] < 0)
        {
// Cross up
         if (MACDAboveZero == false)
         {
           MACDAboveZero=true;
           MACDBelowZero=false;
           if (SoundON) Alert("Histogram is Above Zero Line","\n Time=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
           if (EmailON) SendMail("Histogram is Above Zero Line", "OSMA Crossed up, Date="+TimeToStr(CurTime(),TIME_DATE)+" "+TimeHour(CurTime())+":"+TimeMinute(CurTime())+" Symbol="+Symbol()+" Period="+Period());
         }
        }
        else if (OsmaBuffer[i] < 0 && OsmaBuffer[i + 1] > 0)
        {
// Cross down
         if (MACDBelowZero == false)
         {
          MACDBelowZero=true;
          MACDAboveZero=false;
          if (SoundON) Alert("Histogram is Below Zero Line","\n Date=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
          if (EmailON) SendMail("Histogram is Below Zero Line","OSMA Crossed Down, Date="+TimeToStr(CurTime(),TIME_DATE)+" "+TimeHour(CurTime())+":"+TimeMinute(CurTime())+" Symbol="+Symbol()+" Period="+Period());
         }
        }
      }
    }  
   }
      
//---- done
   return(0);
  }