step ma alert

//+------------------------------------------------------------------+
//|                                              StepMA_Color_v2.mq4 |
//|                           Copyright © 2005, TrendLaboratory Ltd. |
//|                                       E-mail: igorad2004@list.ru |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, TrendLaboratory Ltd."
#property link      "E-mail: igorad2004@list.ru"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Blue
#property indicator_color2 Red
//---- input parameters
extern int PeriodWATR=100;
extern double Kwatr=1.0000;
extern int Advance=0;
extern int HighLow=0;
input int    TriggerCandle 	= 1;
input bool   EnableNativeAlerts = true;
input bool   EnableSoundAlerts  = true;
input bool   EnableEmailAlerts  = true;
input string AlertEmailSubject  = "";
input string AlertText  	= "";
input string SoundFileName	= "alert.wav";
datetime LastAlertTime = D'01.01.1970';
int LastAlertDirection = 0;
//---- indicator buffers
double UpBuffer[];
double DownBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
  int init()
  {
   string short_name;
//---- indicator line
   SetIndexStyle(0,DRAW_ARROW);
   SetIndexStyle(1,DRAW_ARROW);
   SetIndexArrow(0,159);
   SetIndexArrow(1,159);
   SetIndexShift(0,Advance);
   SetIndexShift(1,Advance);
   SetIndexBuffer(0,UpBuffer);
   SetIndexBuffer(1,DownBuffer);
   IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS));
//---- name for DataWindow and indicator subwindow label
   short_name="StepMA("+PeriodWATR+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,"UpTrendStepMA");
   SetIndexLabel(1,"DownTrendStepMA");
//----
   SetIndexDrawBegin(0,PeriodWATR);
   SetIndexDrawBegin(1,PeriodWATR);
//----
   return(0);
  }

//+------------------------------------------------------------------+
//| StepMA_v2                                                         |
//+------------------------------------------------------------------+
int start()
  {
   int i,shift,trend;
   double smin0,smax0,smin1,smax1,AvgRange,dK,WATR;

   AvgRange=0;
	for (i=PeriodWATR-1;i>=0;i--)
	    {
       dK = 1+(PeriodWATR-i)/PeriodWATR;
       AvgRange=AvgRange+ dK*MathAbs(High[i]-Low[i]);
       }
	WATR = AvgRange/PeriodWATR;
	int StepSize=Kwatr*WATR/Point;
	Comment(" StepSize = ", StepSize);


   for(shift=Bars-1;shift>=0;shift--)
   {
	if (HighLow>0)
	  {
	  smax0=Low[shift]+2*StepSize*Point;
	  smin0=High[shift]-2*StepSize*Point;

	  if(Close[shift]>smax1) trend=1;
	  if(Close[shift]<smin1) trend=-1;
	  }

	if (HighLow == 0)
	  {
	  smax0=Close[shift]+2*StepSize*Point;
	  smin0=Close[shift]-2*StepSize*Point;

	  if (Close[shift]>smax1)  trend=1;
	  if (Close[shift]<smin1)  trend=-1;
	  }

	  if(trend>0 && smin0<smin1) smin0=smin1;
	  if(trend<0 && smax0>smax1) smax0=smax1;

	  if (trend>0)
	  {
	  UpBuffer[shift]=smin0+StepSize*Point;
	  DownBuffer[shift]=-1.0;
	  }
	  if (trend<0)
	  {
	  DownBuffer[shift]=smax0-StepSize*Point;
	  UpBuffer[shift]=-1.0;
	  }

	  smin1=smin0;
	  smax1=smax0;
	 }
	 if (((TriggerCandle > 0) && (Time[0] > LastAlertTime)) || (TriggerCandle == 0))
{
	string Text;
	// Above Zero Alert
	if (((UpBuffer[TriggerCandle] > 0) && (UpBuffer[TriggerCandle+ 1] <= 0)) && ((TriggerCandle > 0) || ((TriggerCandle == 0) && (LastAlertDirection != 1))))
	{
		Text = AlertText + "stepma_color_v2: " + Symbol() + " - " + EnumToString((ENUM_TIMEFRAMES)Period()) + " - Buy signal.";
		if (EnableNativeAlerts) Alert(Text);
		if (EnableEmailAlerts) SendMail(AlertEmailSubject + "stepma_color_v2 Alert", Text);
		if (EnableSoundAlerts) PlaySound(SoundFileName);
		LastAlertTime = Time[0];
		LastAlertDirection = 1;
	}
	// Below Zero Alert
	if (((UpBuffer[TriggerCandle] < 0) && (UpBuffer[TriggerCandle+ 1] >= 0)) && ((TriggerCandle > 0) || ((TriggerCandle == 0) && (LastAlertDirection != -1))))
	{
		Text = AlertText + "stepma_color_v2: " + Symbol() + " - " + EnumToString((ENUM_TIMEFRAMES)Period()) + " - Sell signal.";
		if (EnableNativeAlerts) Alert(Text);
		if (EnableEmailAlerts) SendMail(AlertEmailSubject + "stepma_color_v2 Alert", Text);
		if (EnableSoundAlerts) PlaySound(SoundFileName);
		LastAlertTime = Time[0];
		LastAlertDirection = -1;
	}
}
	return(0);
 }