//+------------------------------------------------------------------+
//|                                                        Krest.mq4 |
//|                                              Copyright 2019, AM2 |
//|                                      http://www.forexsyatems.biz |
//+------------------------------------------------------------------+
#property copyright "Copyright 2019, AM2"
#property link      "http://www.forexsyatems.biz"
#property version   "1.00"
#property strict

//--- Inputs
extern double Lots       = 0.1;      // лот
extern double KLot       = 1;        // умножение лота
extern double MaxLot     = 5;        // максимальный лот
extern int StopLoss      = 0;        // лось
extern int TakeProfit    = 0;        // язь
extern int BULevel       = 0;        // уровень БУ
extern int BUPoint       = 30;       // пункты БУ
extern int TrailingStop  = 0;        // трал
extern int TrailingStep  = 20;       // шаг трала
extern int Delta         = 200;      // расстояние до линии
extern int Slip          = 30;       // реквот
extern int Shift         = 1;        // на каком баре сигнал индикатора
extern int Magic         = 0;        // магик

extern string IndName="0TMA+CG mladen";
extern string TimeFrame       = "current time frame";
extern int    HalfLength      = 400;
extern int    Price           = PRICE_WEIGHTED;
extern double BandsDeviations = 1.618;

extern string IndName2="4Trend Bline v0.1";
extern int  TradePeriod       = 40;
extern int  StopPeriod        = 10;
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//---
   Comment("");
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
   Comment("");
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void PutOrder(int type,double price)
  {
   int r=0;
   color clr=Green;
   double sl=0,tp=0;

   if(type==1 || type==3 || type==5)
     {
      clr=Red;
      if(StopLoss>0) sl=NormalizeDouble(price+StopLoss*Point,Digits);
      if(TakeProfit>0) tp=NormalizeDouble(price-TakeProfit*Point,Digits);
     }

   if(type==0 || type==2 || type==4)
     {
      clr=Blue;
      if(StopLoss>0) sl=NormalizeDouble(price-StopLoss*Point,Digits);
      if(TakeProfit>0) tp=NormalizeDouble(price+TakeProfit*Point,Digits);
     }

   r=OrderSend(NULL,type,Lot(),NormalizeDouble(price,Digits),Slip,sl,tp,"",Magic,0,clr);
   return;
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
double Lot()
  {
   double lot=Lots;
   for(int i=OrdersHistoryTotal()-1;i>=0;i--)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_HISTORY))
        {
         if(OrderSymbol()==Symbol() && OrderMagicNumber()==Magic)
           {
            if(OrderProfit()>0) break;
            if(OrderProfit()<0)
              {
               lot=OrderLots()*KLot;
               break;
              }
           }
        }
     }
   if(lot>MaxLot)lot=Lots;
   return(lot);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int CountTrades()
  {
   int count=0;
   for(int i=OrdersTotal()-1;i>=0;i--)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
        {
         if(OrderSymbol()==Symbol() && OrderMagicNumber()==Magic)
           {
            if(OrderType()<2) count++;
           }
        }
     }
   return(count);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void OpenPos()
  {
   double blu = iCustom(NULL,0,IndName2,TradePeriod,StopPeriod,4,Shift);
   double red = iCustom(NULL,0,IndName2,TradePeriod,StopPeriod,5,Shift);
   double gra = iCustom(NULL,0,IndName,TimeFrame,HalfLength,Price,BandsDeviations,0,Shift);

   if(blu<1000 && gra-Bid>Delta*_Point) PutOrder(0,Ask);
   if(red<1000 && Bid-gra>Delta*_Point) PutOrder(1,Bid);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void ClosePos()
  {
   double blu = iCustom(NULL,0,IndName,TimeFrame,HalfLength,Price,BandsDeviations,4,Shift);
   double red = iCustom(NULL,0,IndName,TimeFrame,HalfLength,Price,BandsDeviations,3,Shift);
   double gra= iCustom(NULL,0,IndName,TimeFrame,HalfLength,Price,BandsDeviations,0,Shift);

   if(blu<1000 || Bid>gra) CloseAll(0);
   if(red<1000 || Bid<gra) CloseAll(1);
  }
//+------------------------------------------------------------------+
//| Ступенчатый трал               if(TrailingStop>0) Trailing();    |
//+------------------------------------------------------------------+
void Trailing()
  {
   bool mod;
   for(int i=OrdersTotal()-1;i>=0;i--)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
        {
         if(OrderSymbol()==Symbol() && OrderMagicNumber()==Magic)
           {
            if(OrderType()==OP_BUY)
              {
               if(Bid-OrderOpenPrice()>TrailingStop*Point)
                 {
                  if(OrderStopLoss()<Bid-(TrailingStop+TrailingStep-1)*Point)
                    {
                     mod=OrderModify(OrderTicket(),OrderOpenPrice(),Bid-TrailingStop*Point,OrderTakeProfit(),0,Yellow);
                     return;
                    }
                 }
              }

            if(OrderType()==OP_SELL)
              {
               if((OrderOpenPrice()-Ask)>TrailingStop*Point)
                 {
                  if(OrderStopLoss()>Ask+(TrailingStop+TrailingStep-1)*Point || OrderStopLoss()==0)
                    {
                     mod=OrderModify(OrderTicket(),OrderOpenPrice(),Ask+TrailingStop*Point,OrderTakeProfit(),0,Yellow);
                     return;
                    }
                 }
              }
           }
        }
     }
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void BU()
  {
   bool m;
   for(int i=OrdersTotal()-1;i>=0;i--)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
        {
         if(OrderSymbol()==Symbol() && OrderMagicNumber()==Magic)
           {
            if(OrderType()==OP_BUY)
              {
               if(OrderOpenPrice()<=(Bid-(BULevel+BUPoint)*Point) && OrderOpenPrice()>OrderStopLoss())
                 {
                  m=OrderModify(OrderTicket(),OrderOpenPrice(),OrderOpenPrice()+BUPoint*Point,OrderTakeProfit(),0,Yellow);
                  return;
                 }
              }

            if(OrderType()==OP_SELL)
              {
               if(OrderOpenPrice()>=(Ask+(BULevel+BUPoint)*Point) && (OrderOpenPrice()<OrderStopLoss() || OrderStopLoss()==0))
                 {
                  m=OrderModify(OrderTicket(),OrderOpenPrice(),OrderOpenPrice()-BUPoint*Point,OrderTakeProfit(),0,Yellow);
                  return;
                 }
              }
           }
        }
     }
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void CloseAll(int ot=-1)
  {
   bool cl;
   for(int i=OrdersTotal()-1;i>=0;i--)
     {
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
        {
         if(OrderSymbol()==Symbol() && OrderMagicNumber()==Magic)
           {
            if(OrderType()==0 && (ot==0 || ot==-1))
              {
               RefreshRates();
               cl=OrderClose(OrderTicket(),OrderLots(),NormalizeDouble(Bid,Digits),Slip,White);
              }
            if(OrderType()==1 && (ot==1 || ot==-1))
              {
               RefreshRates();
               cl=OrderClose(OrderTicket(),OrderLots(),NormalizeDouble(Ask,Digits),Slip,White);
              }
           }
        }
     }
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
   if(CountTrades()<1)OpenPos();
   else ClosePos();

   if(BULevel>0) BU();
   if(TrailingStop>0) Trailing();

   Comment("\n Trades: ",CountTrades());
  }
//+------------------------------------------------------------------+

Андрей поясните пожалуйста почему?