//+------------------------------------------------------------------+
//|              Filename changed to ForexOFFTrend.mq4 by CrazyChart |
//|                                                 SilverTrend .mq4 |
//|                              SilverTrend rewritten by CrazyChart |
//|                                                  http://viac.ru/ |
//+------------------------------------------------------------------+

#property copyright "SilverTrend rewritten by CrazyChart"
#property link "http://viac.ru/ "
//----
#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Blue
#property indicator_color2 Red
//---- input parameters
extern int CountBars=400;
extern int SSP=7;
extern double Kmin = 1.6;
extern double Kmax = 50.6;
extern bool gAlert=True; // Switch to allow alerts
//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
//----
bool gSellAlertGiven= false; // Used to stop constant alerts
bool gBuyAlertGiven = false; // Used to stop constant alerts
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_LINE,0,2);
   SetIndexBuffer(0,ExtMapBuffer1);
   SetIndexStyle(1,DRAW_LINE,0,2);
   SetIndexBuffer(1,ExtMapBuffer2);
//----
   if(CountBars>= Bars)
      CountBars = Bars;
   SetIndexDrawBegin(0,Bars-CountBars+SSP);
   SetIndexDrawBegin(1,Bars-CountBars+SSP);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int i,
   i2,
   loopbegin,
   counted_bars=IndicatorCounted();
   double SsMax,
   SsMin,
   K,
   val1,
   val2,
   smin,
   smax,
   price;
   if(Bars<=SSP+1)
      return(0);
//---- initial zero
   if(counted_bars<SSP+1)
     {
      for(i=1; i<=SSP; i++)
         ExtMapBuffer1[CountBars-i]=0.0;
      for(i=1; i<=SSP; i++)
         ExtMapBuffer2[CountBars-i]=0.0;
     }
   for(i=CountBars-SSP; i>=0; i--)
     {
      SsMax = High[Highest(NULL, 0, MODE_HIGH, SSP, i - SSP + 1)];
      SsMin = Low[Lowest(NULL, 0, MODE_LOW, SSP, i - SSP + 1)];
      smin = NormalizeDouble((SsMin - (SsMax - SsMin)*Kmin / 100), Digits);
      smax = NormalizeDouble((SsMax - (SsMax - SsMin)*Kmax / 100), Digits);
      int index=MathMax(0,i-SSP+6);
      ExtMapBuffer1[index]=smax;
      if(i-SSP-1>=0)ExtMapBuffer2[i-SSP-1]=smax;
      val1 = ExtMapBuffer1[0];
      val2 = ExtMapBuffer2[0];
      if(val1>val2)
        {
         Comment("покупка buy ",val1);
         if(gAlert==true && gBuyAlertGiven==false)
           {
            PlaySound("alert.wav");

            Alert("Buy signal at "+DoubleToStr(val1,Digits)+" on "+Period()+
                  " minute chart");
            gBuyAlertGiven=true;
            gSellAlertGiven=false;
           }
        }
      if(val1<val2)
        {
         Comment("продажа sell ",val2);
         if(gAlert==true && gSellAlertGiven==false)
           {
            PlaySound("alert.wav");
            Alert("Sell signal at "+DoubleToStr(val2,Digits)+" on "+Period()+
                  " minute chart");
            gBuyAlertGiven = false;
            gSellAlertGiven=true;
           }
        }
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+