//+------------------------------------------------------------------+
//|                                                      ProjectName |
//|                                      Copyright 2012, CompanyName |
//|                                       http://www.companyname.net |
//+------------------------------------------------------------------+
#property indicator_chart_window 
#property indicator_buffers 3
#property indicator_color1 Yellow
#property indicator_color2 Green 
#property indicator_color3 Red 
#property indicator_width1 2
#property indicator_width2 2
#property indicator_width3 2

//---- input parameters 
extern int period=16;
extern int method=3; // MODE_SMA 
extern int price=0; // PRICE_CLOSE 
extern int sdvig=0;

extern bool bPlaySound=true;           // Включение звука при смене цвета
extern bool bAllert=true;           // Включение звука при смене цвета
extern string SoundName="alert.wav";   // Звуковой файл
extern int CheckBar=1;
//---- buffers 

double Uptrend[];
double Dntrend[];
double ExtMapBuffer[];

double vect[];

static bool bs=false,ba=false;
static int bTime=0;
//+------------------------------------------------------------------+ 
//| Custom indicator initialization function | 
//+------------------------------------------------------------------+ 
int init() 
  {
   IndicatorBuffers(4);
   SetIndexBuffer(0,ExtMapBuffer);
   SetIndexBuffer(1,Uptrend);
   SetIndexBuffer(2,Dntrend);
   SetIndexBuffer(3,vect);

   SetIndexStyle(0,DRAW_LINE);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexStyle(2,DRAW_LINE);

   SetIndexDrawBegin(0,1*period);
   SetIndexDrawBegin(1,2*period);
   SetIndexDrawBegin(2,3*period);

   IndicatorShortName("Signal Line("+period+")");
   SetIndexLabel(1,"UP");
   SetIndexLabel(2,"DN");

   bs=false;
   ba=false;
   bTime=0;

   return(0);
  }

//+------------------------------------------------------------------+ 
//| Custor indicator deinitialization function | 
//+------------------------------------------------------------------+ 
int deinit() { return(0); }

//+------------------------------------------------------------------+ 
//| ?????????? ??????? | 
//+------------------------------------------------------------------+ 
double WMA(int x,int p) { return(iMA(NULL,0,p,0,method,price,x+sdvig)); }
//+------------------------------------------------------------------+ 
//| Custom indicator iteration function | 
//+------------------------------------------------------------------+ 
int start() 
  {
   int p=MathSqrt(period);

   int i,limit0,limit1,limit2;
   
   int counted_bars = IndicatorCounted();
   if(counted_bars < 0)  return(-1);
   if(counted_bars > 0)   counted_bars--;
   limit2 = Bars - counted_bars;
   if(counted_bars==0) limit2--;
      
   limit1=limit2;
   limit0=limit1;

   if(counted_bars==0)
     {
      limit1-=(period);
      limit2-=(2*period);
     }

   for(i = limit0; i >= 0; i--)    vect[i]          = 2*WMA(i, period/2) - WMA(i, period);
   for(i = limit1; i >= 0; i--)    ExtMapBuffer[i]  = iMAOnArray(vect, 0, p, 0, method, i);
   for(i=limit2; i>=0; i--) 
     {
      Uptrend[i] = EMPTY_VALUE; if(ExtMapBuffer[i]> ExtMapBuffer[i+1]) {Uptrend[i+1] = ExtMapBuffer[i+1]; Uptrend[i] = ExtMapBuffer[i]; }
      Dntrend[i] = EMPTY_VALUE; if(ExtMapBuffer[i]< ExtMapBuffer[i+1]) {Dntrend[i+1] = ExtMapBuffer[i+1]; Dntrend[i] = ExtMapBuffer[i]; }
     }
   if(bTime!=Time[0]) 
     {
      bTime=Time[0];
      bs=false;
      ba=false;
     }
   if((ExtMapBuffer[CheckBar+2]-ExtMapBuffer[CheckBar+1])*(ExtMapBuffer[CheckBar+1]-ExtMapBuffer[CheckBar])<0)
     {
      if(bPlaySound && !bs) PlaySound(SoundName);
      bs=true;
      if(bAllert && !ba) 
        {
         string mes="";
         if(ExtMapBuffer[CheckBar]-ExtMapBuffer[CheckBar+1]>0) mes="Смена тренда, восходящий";
         if(ExtMapBuffer[CheckBar]-ExtMapBuffer[CheckBar+1]<0) mes="Смена тренда, нисходящий";
         if(mes!="") Alert(mes+": "+Symbol()+"; "+Period_toStr()+"; "+DoubleToStr(Bid,Digits));
        }
      ba=true;
     }
   return(0);
  }
//+------------------------------------------------------------------+

string Period_toStr()
  {
   switch(Period()) 
     {
      case PERIOD_M1:    return("M1" );
      case PERIOD_M5:    return("M5" );
      case PERIOD_M15:   return("M15");
      case PERIOD_M30:   return("M30");
      case PERIOD_H1:    return("H1" );
      case PERIOD_H4:    return("H4" );
      case PERIOD_D1:    return("D1" );
      case PERIOD_W1:    return("W1" );
      case PERIOD_MN1:   return("MN1");
     }
  }
//+------------------------------------------------------------------+