//+------------------------------------------------------------------+
//|                                                Schaff Trendy.mq4 |
//|                      Copyright © 2004, MetaQuotes Software Corp. |
//|                                       http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, MetaQuotes Software Corp."
#property link "perky_z@yahoo.com & Darkstonexa@yahoo.com.au"
#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 LightSeaGreen
#property indicator_color2 Red

//---- input parameters
extern int SigPeriod=23;
extern int MAShort= 23;
extern int MALong = 50;
extern int Cycle=10;
extern int BarsCount=500;

//----
int shift=0;
double MCD=0,LLV=0,HHV=0,s=0,MA_Short=0,MA_Long=0,ST=0;
double smconst=0;
bool check_begin=false;
bool check_begin_MA=false;
int sum=0,n=0,bars_=0;
double MA=0.0,prev=0.0;
double MCD_Arr[500];
//---- buffers
double TrendBuffer[];
double SignalBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {

//---- 3 additional buffers are used for counting.
   IndicatorBuffers(2);
//---- indicator buffers
   SetIndexBuffer(0,TrendBuffer);
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(1,SignalBuffer);
   SetIndexStyle(1,DRAW_LINE);
//---- name for DataWindow and indicator subwindow label
   IndicatorShortName("Schaff Trend("+Cycle+")");
   SetIndexDrawBegin(0,BarsCount);
   return(0);
  }
//+------------------------------------------------------------------+
//|  Schaff Trendy                                                   |
//+------------------------------------------------------------------+
int start()
  {
   check_begin=false;
   check_begin_MA=false;
   n = 1;
   s = 1;
   double a= 1+Cycle/2;
   smconst = 1/a;

   int counted_bars=IndicatorCounted();
   if(counted_bars < 0)  return(-1);
   if(counted_bars>0) counted_bars--;
   int limit=Bars-counted_bars;
   if(counted_bars==0) limit--;

/* if(BarsCount > 0)
     {
       if(BarsCount > Bars)
         {
           bars_ = limit;
         }
       else
         {
           bars_ = BarsCount;
         }
     }*/

   bars_=limit;
   for(shift=bars_; shift>=0; shift--)
     {
      MA_Short= iMA(NULL,0,MAShort,0,MODE_EMA,PRICE_TYPICAL,shift);
      MA_Long = iMA(NULL,0,MALong,0,MODE_EMA,PRICE_TYPICAL,shift);
      MCD_Arr[n]=MA_Short-MA_Long;
      MCD=MA_Short-MA_Long;
      //----
      if(n>=Cycle)
        {
         n=1;
         check_begin=true;
        }
      else
         n=n+1;

      if(check_begin)
        {
         for(int i=1; i<=Cycle; i++)
           {
            if(i==1)
               LLV=MCD_Arr[i];
            else
            if(LLV>MCD_Arr[i])
               LLV=MCD_Arr[i];
            //----
            if(i==1)
               HHV=MCD_Arr[i];
            else
            if(HHV<MCD_Arr[i])
               HHV=MCD_Arr[i];
           }
         ST=((MCD-LLV)/(HHV-LLV))*100+0.01;
         s = s+1;
         if(s>=(Cycle)/2)
           {
            s=1;
            check_begin_MA=true;
           }
        }
      else ST=0;
      if(check_begin_MA)
        {
         prev=TrendBuffer[shift+1];
         MA=smconst*(ST-prev)+prev;
         //Comment ("\nMa= ",MA,"\nPrev= ",prev,"\nST=  ",ST,"\nLLV=  ",LLV,"\nHHV=  ",HHV,"\nMCD= ",MCD,"\nTrendBuffer=  ",TrendBuffer[shift-1],"\n smsconst  ",smconst);
         TrendBuffer[shift]=MA;

        }

     }
   for(shift=bars_; shift>=0; shift--)
     {
      SignalBuffer[shift]=iMAOnArray(TrendBuffer,0,SigPeriod,0,MODE_EMA,shift);
     }
   return(0);
  }
//+------------------------------------------------------------------+