Ma_Parabolic_st2_2

//+------------------------------------------------------------------+
//|                                             Ma-Parabolic_st2.mq4 |
//|                      Copyright © 2008, MetaQuotes Software Corp. |
//|                      Copyright © 2008, Ëóêàøóê Â.Ã. aka lukas1.  |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2008, MetaQuotes + lukas1"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Orchid
#property indicator_color2 Maroon
//---- input parameters
extern int    Ma=14;
extern int    method=3;
extern int    app_price=0;

extern double StepH=0.2;//äëÿ âåðõíèõ òî÷åê
extern double MaximumH=0.5;//

extern double StepL=0.02;//äëÿ íèæíèõ òî÷åê
extern double MaximumL=0.05;//

//---- buffers
double SarBuffer[];
double MaBuffer[];
//----
static bool first=false;
bool   dirlong;
double start,last_high,last_low;
double ep,sar,price_low,price_high;
int    i,j;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   IndicatorDigits(Digits);
   SetIndexLabel(0,NULL); 
   SetIndexStyle(0,DRAW_ARROW);
   SetIndexArrow(0,159);
   SetIndexBuffer(0,SarBuffer);
   int draw_bars=4/MathMin(StepH,StepL);
   if(draw_bars>Bars-100) draw_bars=Bars-100;
   SetIndexDrawBegin(0, draw_bars); 
//----
   SetIndexLabel(1,"period= "+Ma); 
   SetIndexStyle(1,DRAW_LINE,0,2);
   SetIndexBuffer(1,MaBuffer);
   SetIndexDrawBegin(0, draw_bars);
   if(StepH >MaximumH) StepH = MaximumH;
   if(StepL >MaximumL) StepL = MaximumL;
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Parabolic Sell And Reverse system                                |
//+------------------------------------------------------------------+
int start()
  {
   if(Bars<5) return(0);
   dirlong=true;
   start=MathMin(StepH,StepL);
//--------------------------------------------+
   for(j=Bars-4;j>=0;j--)
      MaBuffer[j] = iMA(Symbol(),0,Ma,0,method,app_price,j);

   int i=Bars-4;
   while(i>=0)
     {
      price_low=MaBuffer[i]-Point;
      price_high=MaBuffer[i]+Point;
      //sar ðàâåí öåíà ïðåäûäóùåãî áàðà ïëþñ øàã óìíîæèòü íà 
      //(ñòàðàÿ öåíà ìèíóñ çíà÷åíèå SarBuffer ïðåäûäóùåãî áàðà)
      sar=SarBuffer[i+1]+start*(ep-SarBuffer[i+1]);
//----
      if(dirlong)//öåïî÷êà ââåðõ
        {
         if(ep<price_high && (start+StepL)<=MaximumL) start+=StepL;
         if(sar>=price_low)//åñëè óñëîâèÿ äëÿ ïåðåêëþ÷åíèÿ íàñòóïèëè
           {
            start=StepL; 
            dirlong=false; 
            ep=price_low;//óñòàíàâëèâàåì ïîñëåäíþþ öåíó = ìèíèìóì
            last_low=price_low;
            if(MaBuffer[i]+Point<last_high) SarBuffer[i]=last_high;
            else SarBuffer[i]=MaBuffer[i]+Point;
            i--;
            continue;
           }
         else
           {
            if(ep<price_low && (start+StepL)<=MaximumL) start+=StepL;
            //è ïåðåñ÷èòûâàåì last_high è ep äëÿ ðàñ÷åòà ñëåäóþùåé òî÷êè ìàêñèìóìà
            if(ep<price_high) { last_high=price_high; ep=price_high; }
           }
        }
//----
      else//öåïî÷êà âíèç
        {
         if(ep>price_low && (start+StepH)<=MaximumH) start+=StepH;
         if(sar<=price_high)//åñëè íàñòóïèëè óñëîâèÿ ïåðåêëþ÷åíèÿ
           {
            start=StepH; 
            dirlong=true; 
            ep=price_high;//óñòàíàâëèâàåì ïîñëåäíþþ öåíó = ìàêñèìóì
            last_high=price_high;
            if(MaBuffer[i]-Point>last_low) SarBuffer[i]=last_low;
            else SarBuffer[i]=MaBuffer[i]-Point;
            i--;
            continue;
           }
         else
           {
            if(ep>price_high && (start+StepH)<=MaximumH) start+=StepH;
            //åñëè óñëîâèÿ äëÿ ïåðåêëþ÷åíèÿ íå íàñòóïèëè
            //òî ïåðåñ÷èòûâàåì last_low è ep äëÿ ðàñ÷åòà ñëåäóþùåé òî÷êè ìèíèìóìà
            if(ep>price_low){last_low=price_low;ep=price_low;}
           }
        }
      SarBuffer[i]=sar;
      i--;
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+