//+------------------------------------------------------------------+
//|                                   Slope Direction Line Modified  |
//+------------------------------------------------------------------+
#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 LightBlue
#property indicator_color2 Tomato
//---- input parameters
extern int period=80;
extern int method=3; // MODE_SMA
extern int price=0; // PRICE_CLOSE
//---- buffers
double Uptrend[];
double Dntrend[];
double ExtMapBuffer[];
double TrendDir[];


//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
IndicatorBuffers(4);
SetIndexBuffer(0, Uptrend);
//ArraySetAsSeries(Uptrend, true);
SetIndexBuffer(1, Dntrend);
//ArraySetAsSeries(Dntrend, true);
SetIndexBuffer(2, ExtMapBuffer);
ArraySetAsSeries(ExtMapBuffer, true);
SetIndexBuffer(3, TrendDir);

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

SetIndexLabel(0,"Uptrend");
SetIndexLabel(1,"Dntrend");

IndicatorShortName("Slope Direction Line("+period+")");
return(0);
}

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

//+------------------------------------------------------------------+
//| WMA |
//+------------------------------------------------------------------+
double WMA(int x, int p)
{
   return(iMA(NULL, 0, p, 0, method, price, x));
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
   int counted_bars = IndicatorCounted();

   if(counted_bars < 0)
   return(-1);

   int x = 0;
   int p = MathSqrt(period);
   int e = Bars - counted_bars + period + 1;

   double vect[], trend[];

   if(e > Bars)
   e = Bars;

   ArrayResize(vect, e);
   ArraySetAsSeries(vect, true);
   ArrayResize(trend, e);
   ArraySetAsSeries(trend, true);

   for(x = 0; x < e; x++)
   {
      vect[x] = 2*WMA(x, period/2) - WMA(x, period);
   }

   for(x = 0; x < e-period; x++)

   ExtMapBuffer[x] = iMAOnArray(vect, 0, p, 0, method, x);

   for(x = e-period; x >= 0; x--)
   {
      trend[x] = trend[x+1];
      if (ExtMapBuffer[x]> ExtMapBuffer[x+1]) trend[x] =1;
      if (ExtMapBuffer[x]< ExtMapBuffer[x+1]) trend[x] =-1;

      TrendDir[x] = trend[x];
      
      if (trend[x]>0)
    { Uptrend[x] = ExtMapBuffer[x]; 
      if (trend[x+1]<0) Uptrend[x+1]=ExtMapBuffer[x+1];
      Dntrend[x] = EMPTY_VALUE;
    }
    else              
    if (trend[x]<0)
    { 
      Dntrend[x] = ExtMapBuffer[x]; 
      if (trend[x+1]>0) Dntrend[x+1]=ExtMapBuffer[x+1];
      Uptrend[x] = EMPTY_VALUE;
    }    
   }

//   Comment("CurrentUptrend= ",Uptrend[0]," CurrentDntrend= ",Dntrend[0]," CurrentTrend= ",trend[0]);

return(0);
}