MACD_ColorHist_AlertGGv2

//compile//
//+------------------------------------------------------------------+
//|                                         MACD_ColorHist_Alert.mq4 |
//|                                    Copyright © 2006, Robert Hill |
//|                                                                  |
//Could you give me a price for taking your MACD Color Hist Alert (attached)
// and changing it so that the histogram bars change color when they
// switch from expanding to contracting (and visa versa)
// and also popup an alert that this has happened,
// as well as add an extra alert (popup and email) when the signal line
// goes thru 0 along with a text message on the chart
// that says "the trend has changed to up/down" as the case may be.
//The attached JRSX histograms change color the way I like.
// Perhaps you could add the same alerts as per above to this one as well.
//+------------------------------------------------------------------+
#property  copyright "Copyright © 2006, Robert Hill"
//---- indicator settings
#property  indicator_separate_window
#property  indicator_buffers 4
#property  indicator_color1  Aqua
#property  indicator_color2  Red
#property  indicator_color3  Green
#property  indicator_color4  Red

//---- indicator parameters

extern bool SoundON=true;
extern bool EmailON=false;

extern int FastEMA=12;
extern int SlowEMA=26;
extern int SignalSMA=9;
//---- indicator buffers
double     MACD_buffer[];
double     Signal_buffer[];
double HistogramBufferUp[];
double HistogramBufferDown[];
bool HistAboveZero = false;
bool HistBelowZero = false;
bool MACDAboveZero = false;
bool MACDBelowZero = false;
//---- variables

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- drawing settings
//   IndicatorBuffers(3);
   IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS)+1);
   SetIndexStyle(0,DRAW_LINE,STYLE_SOLID);
   SetIndexBuffer(0,MACD_buffer);
   SetIndexDrawBegin(0,SlowEMA);
   SetIndexStyle(1,DRAW_LINE,STYLE_DOT);
   SetIndexBuffer(1,Signal_buffer);
   SetIndexDrawBegin(1,SignalSMA);
   SetIndexStyle(2,DRAW_HISTOGRAM,STYLE_SOLID);
   SetIndexBuffer(2,HistogramBufferUp);
   SetIndexStyle(3,DRAW_HISTOGRAM,STYLE_SOLID);
   SetIndexBuffer(3,HistogramBufferDown);
//   SetIndexDrawBegin(2,SlowEMA + SignalSMA);
//---- name for DataWindow and indicator subwindow label
   IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalSMA+")");
   SetIndexLabel(0,"MACD");
   SetIndexLabel(1,"Signal");
   SetIndexLabel(2,"Histogram");
   
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//| Moving Averages Convergence/Divergence                           |
//+------------------------------------------------------------------+
int start()
  {
   int limit;
   double current, prev;
   
   int counted_bars=IndicatorCounted();
//---- check for possible errors
   if(counted_bars<0) return(-1);
//---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
//---- macd counted in the 1-st buffer
   for(int i=0; i<limit; i++)
      MACD_buffer[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 buffer
   for(i=0; i<limit; i++)
      Signal_buffer[i]=iMAOnArray(MACD_buffer,Bars,SignalSMA,0,MODE_SMA,i);

   for(i=0; i<limit; i++)
   {
      HistogramBufferUp[i] = 0;
      HistogramBufferDown[i] = 0;
      current = MACD_buffer[i] - Signal_buffer[i];
      prev = MACD_buffer[i+1] - Signal_buffer[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 crossing 0 line
        if (HistogramBufferUp[i] > 0 && HistogramBufferDown[i + 1] < 0)
        {
// Cross up
         if (HistAboveZero == false)
         {
           HistAboveZero=true;
           HistBelowZero=false;
           if (SoundON) Alert("MACD Histogram Crossed up","\n Time=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
           if (EmailON) SendMail("MACD Histogram Crossed up", "MACD Crossed up, Date="+TimeToStr(CurTime(),TIME_DATE)+" "+TimeHour(CurTime())+":"+TimeMinute(CurTime())+" Symbol="+Symbol()+" Period="+Period());
         }
        }
        else if (HistogramBufferDown[i] < 0 && HistogramBufferUp[i + 1] > 0)
        {
// Cross down
         if (HistBelowZero == false)
         {
          HistBelowZero=true;
          HistAboveZero=false;
          if (SoundON) Alert("MACD Histogram Crossed down","\n Date=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
          if (EmailON) SendMail("MACD Histogram Crossed down","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 (Signal_buffer[i] > 0 && Signal_buffer[i + 1] < 0)
        {
// Cross up
         if (MACDAboveZero == false)
         {
           MACDAboveZero=true;
           MACDBelowZero=false;
           if (SoundON) Alert("MACD Signal line Crossed up","\n Time=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
           if (EmailON) SendMail("MACD Signal line Crossed up", "MACD Crossed up, Date="+TimeToStr(CurTime(),TIME_DATE)+" "+TimeHour(CurTime())+":"+TimeMinute(CurTime())+" Symbol="+Symbol()+" Period="+Period());
         }
        }
        else if (Signal_buffer[i] < 0 && Signal_buffer[i + 1] > 0)
        {
// Cross down
         if (MACDBelowZero == false)
         {
          MACDBelowZero=true;
          MACDAboveZero=false;
          if (SoundON) Alert("MACD Signal line Crossed down","\n Date=",TimeToStr(CurTime(),TIME_DATE)," ",TimeHour(CurTime()),":",TimeMinute(CurTime()),"\n Symbol=",Symbol()," Period=",Period());
          if (EmailON) SendMail("MACD Signal line Crossed down","MACD Crossed Down, Date="+TimeToStr(CurTime(),TIME_DATE)+" "+TimeHour(CurTime())+":"+TimeMinute(CurTime())+" Symbol="+Symbol()+" Period="+Period());
         }
        }
      }
      
   }
      
//---- done
   return(0);
  }