Arrow codes

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Lime
//---- input parameters
extern double    Step=0.02;
extern double    Maximum=0.2;
//---- buffers
double SarBuffer[];
//----
int    save_lastreverse;
bool   save_dirlong;
double save_start;
double save_last_high;
double save_last_low;
double save_ep;
double save_sar;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_ARROW);
   SetIndexArrow(0,159);
   SetIndexBuffer(0,SarBuffer);
//----
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| SaveLastReverse                                                  |
//+------------------------------------------------------------------+
void SaveLastReverse(int last,int dir,double start_index,double low,double high,double ep,double sar)
  {
   save_lastreverse=last;
   save_dirlong=dir;
   save_start=start_index;
   save_last_low=low;
   save_last_high=high;
   save_ep=ep;
   save_sar=sar;
  }
//+------------------------------------------------------------------+
//| Parabolic Sell And Reverse system                                |
//+------------------------------------------------------------------+
int start()
  {
   static bool first=true;
   bool   dirlong;
   double start_index,last_high,last_low;
   double ep,sar,price_low,price_high,price;
   int    i;
   int limit,cb;
//----
   if(Bars<3) return(0);
   int counted_bars=IndicatorCounted();
   if(counted_bars < 0)  return(-1);
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
   if(counted_bars==0) limit-=2;
 
//---- initial settings
   i=limit;
   if(counted_bars==0 || first)
     {
      first=false;
      dirlong=true;
      start_index=Step;
      last_high=-10000000.0;
      last_low=10000000.0;
      while(i>0)
        {
         save_lastreverse=i;
         price_low=Low[i];
         if(last_low>price_low) last_low=price_low;
         price_high=High[i];
         if(last_high<price_high) last_high=price_high;
         if(price_high>High[i+1] && price_low>Low[i+1]) break;
         if(price_high<High[i+1] && price_low<Low[i+1]) { dirlong=false; break; }
         i--;
        }
      //---- initial zero
      int k=i;
      while(k<Bars)
        {
         SarBuffer[k]=0.0;
         k++;
        }
      //---- check further
      if(dirlong) { SarBuffer[i]=Low[i+1]; ep=High[i]; }
      else        { SarBuffer[i]=High[i+1]; ep=Low[i]; }
      i--;
     }
   else
     {
      i=save_lastreverse;
      start_index=save_start;
      dirlong=save_dirlong;
      last_high=save_last_high;
      last_low=save_last_low;
      ep=save_ep;
      sar=save_sar;
     }
//----
   while(i>=0)
     {
      price_low=Low[i];
      price_high=High[i];
      //--- check for reverse
      if(dirlong && price_low<SarBuffer[i+1])
        {
         SaveLastReverse(i,true,start_index,price_low,last_high,ep,sar);
         start_index=Step; dirlong=false;
         ep=price_low;  last_low=price_low;
         SarBuffer[i]=last_high;
         i--;
         continue;
        }
      if(!dirlong && price_high>SarBuffer[i+1])
        {
         SaveLastReverse(i,false,start_index,last_low,price_high,ep,sar);
         start_index=Step; dirlong=true;
         ep=price_high; last_high=price_high;
         SarBuffer[i]=last_low;
         i--;
         continue;
        }
      //---
      price=SarBuffer[i+1];
      sar=price+start_index*(ep-price);
      if(dirlong)
        {
         if(ep<price_high && (start_index+Step)<=Maximum) start_index+=Step;
         if(price_high<High[i+1] && i==Bars-2) sar=SarBuffer[i+1];
 
         price=Low[i+1];
         if(sar>price) sar=price;
         price=Low[i+2];
         if(sar>price) sar=price;
         if(sar>price_low)
           {
            SaveLastReverse(i,true,start_index,price_low,last_high,ep,sar);
            start_index=Step; dirlong=false; ep=price_low;
            last_low=price_low;
            SarBuffer[i]=last_high;
            i--;
            continue;
           }
         if(ep<price_high) { last_high=price_high; ep=price_high; }
        }
      else
        {
         if(ep>price_low && (start_index+Step)<=Maximum) start_index+=Step;
         if(price_low<Low[i+1] && i==Bars-2) sar=SarBuffer[i+1];
 
         price=High[i+1];
         if(sar<price) sar=price;
         price=High[i+2];
         if(sar<price) sar=price;
         if(sar<price_high)
           {
            SaveLastReverse(i,false,start_index,last_low,price_high,ep,sar);
            start_index=Step; dirlong=true; ep=price_high;
            last_high=price_high;
            SarBuffer[i]=last_low;
            i--;
            continue;
           }
         if(ep>price_low) { last_low=price_low; ep=price_low; }
        }
      SarBuffer[i]=sar;
      i--;
     }
//---
   for(cb=limit;cb>=0;cb--)
     {
      if(GreaterDoubles(SarBuffer[cb],0,Digits))
        {
         string object_name="price"+string(Time[cb]);
         //--- first find object by name
         if(ObjectFind(object_name)<0)
           {
            //--- if not found, create it
            if(ObjectCreate(object_name,OBJ_ARROW,0,Time[cb],SarBuffer[cb]))
              {
               //--- set object properties
               //--- arrow code
               ObjectSet(object_name,OBJPROP_ARROWCODE,SYMBOL_LEFTPRICE);
               //--- color
               ObjectSet(object_name,OBJPROP_COLOR,DodgerBlue);
               //--- price
               ObjectSet(object_name,OBJPROP_PRICE1,SarBuffer[cb]);
               //--- time
               ObjectSet(object_name,OBJPROP_TIME1,Time[cb]);
              }
           }
         else
           {
            //--- if the object exists, just modify its price coordinate
            ObjectSet(object_name,OBJPROP_PRICE1,SarBuffer[cb]);
           }
        }
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| GreaterDoubles                                                   |
//+------------------------------------------------------------------+
bool GreaterDoubles(double number1,double number2,int dig)
  {
   if(NormalizeDouble(number1-number2,dig)>0) return(true);
   else return(false);
  }
//+------------------------------------------------------------------+