SilverTrend rewritten by CrazyChart

//+------------------------------------------------------------------+
//|              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);
       ExtMapBuffer1[i-SSP+6] = smax;
       ExtMapBuffer2[i-SSP-1] = smax;
       val1 = ExtMapBuffer1[0];
       val2 = ExtMapBuffer2[0];
       if(val1 > val2)
         {
           Comment("ïîêóïêà 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("ïðîäàæà 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);
  }
//+------------------------------------------------------------------+