//+------------------------------------------------------------------+
//|                                               LevelsTrade_v2.mq4 |
//|                                         Copyright © 2010, Candid |
//|                                          http://candid.110mb.com |
//+------------------------------------------------------------------+
#property copyright "Candid"
#property link      "http://candid.110mb.com"

extern int LifeTime = 60;
extern int StopLevel = 20;
extern int Delta = 0;

bool StartEA;
double HalfPoint;
int LT;
double DLvl;
double RecDLvl;
double dStopLevel;
double dDelta;

//+------------------------------------------------------------------+
//| expert initialization function                                   |
//+------------------------------------------------------------------+
int init() {
  LT = LifeTime*60;
  StartEA = true;
  ObjectCreate("TopLevel",OBJ_HLINE,0,0,0);
  ObjectCreate("BotLevel",OBJ_HLINE,0,0,0);
  return(0);
}
//+------------------------------------------------------------------+
//| expert deinitialization function                                 |
//+------------------------------------------------------------------+
int deinit() {
  ObjectDelete("TopLevel");
  ObjectDelete("BotLevel");
  return(0);
}
//+------------------------------------------------------------------+
//| expert start function                                            |
//+------------------------------------------------------------------+
int start() {
  if (StartEA) {
    StartEA = false;
    HalfPoint = 0.5*Point;
    DLvl = 1000*Point;
    RecDLvl = 1.0/DLvl;
    dStopLevel = StopLevel*Point;
    dDelta = Delta*Point;
    static bool WasUpCross = false;
    static bool WasDownCross = false;
    static bool TopJump = false;
    static double PreTopLvl;
    static double PreBotLvl;
    PreTopLvl = GetTopLevel(Bid);
    PreBotLvl = GetBotLevel(Bid);
Print("DLvl=",DoubleToStr(DLvl,Digits),", RecDLvl=",DoubleToStr(RecDLvl,Digits),", dStopLevel=",DoubleToStr(dStopLevel,Digits),", dDelta=",DoubleToStr(dDelta,Digits));    
  }
  double TopLvl = GetTopLevel(Bid);
  double BotLvl = GetBotLevel(Bid);

  ObjectSet("TopLevel",OBJPROP_PRICE1,TopLvl);
  ObjectSet("TopLevel",OBJPROP_WIDTH,2);
  ObjectSet("TopLevel",OBJPROP_COLOR,Blue);
  ObjectSet("BotLevel",OBJPROP_PRICE1,BotLvl);
  ObjectSet("BotLevel",OBJPROP_WIDTH,2);
  ObjectSet("BotLevel",OBJPROP_COLOR,Yellow);
  WindowRedraw();

  if (PreBotLvl-BotLvl > HalfPoint) {
    if (!TopJump) {
      WasDownCross = true;
      WasUpCross = false;
    }
  }
  PreBotLvl = BotLvl;
  if (TopJump) {
    if (Bid-PreTopLvl > HalfPoint) {
      WasDownCross = false;
      WasUpCross = true;
      PreTopLvl = TopLvl;
      TopJump = false;
    } else {
      if (PreTopLvl-Bid > HalfPoint) TopJump = false;
    }
  }
  if (TopLvl-PreTopLvl > HalfPoint) {
    if (Bid-PreTopLvl > HalfPoint) {
      WasDownCross = false;
      WasUpCross = true;
      PreTopLvl = TopLvl;
      TopJump = false;
    } else TopJump = true;
  }
  if (PreTopLvl-TopLvl > HalfPoint) PreTopLvl = TopLvl;

// Блок сопровождения ордеров
  double LvlPrice;
  bool IsStopOrder = false;
  for(int ord=OrdersTotal();ord>=0;ord--) {
    if(OrderSelect(ord,SELECT_BY_POS,MODE_TRADES)==false) continue;
    switch(OrderType()) {
      case OP_BUY: 
        if (TimeCurrent()-OrderOpenTime() > LT) OrderClose(OrderTicket(),OrderLots(),Bid,5,Blue);
        break;
      case OP_SELL: 
        if (TimeCurrent()-OrderOpenTime() > LT) OrderClose(OrderTicket(),OrderLots(),Ask,5,Yellow);
        break;
      case OP_BUYSTOP: 
        IsStopOrder = true;
        LvlPrice = GetBuyStopLevel(TopLvl,dStopLevel);
        if (OrderOpenPrice()-LvlPrice > HalfPoint) OrderModify(OrderTicket(),NormalizeDouble(LvlPrice,Digits),0,0,0,Blue);
        break;
      case OP_SELLSTOP: 
        IsStopOrder = true;
        LvlPrice = GetSellStopLevel(BotLvl,dStopLevel);
        if (LvlPrice-OrderOpenPrice() > HalfPoint) OrderModify(OrderTicket(),NormalizeDouble(LvlPrice,Digits),0,0,0,Yellow);
        break;
    }  //  switch(OrderType())
  }  //  for(int ord=OrdersTotal();ord>=0;ord--)
  
//  Блок установки ордеров  
  static int PreMnt;
  int Mnt = TimeMinute(TimeCurrent());
  if (Mnt != PreMnt) {
    PreMnt = Mnt;
    if (!IsStopOrder && WasDownCross) {
      if (TopLvl+HalfPoint > Bid+dStopLevel && Bid-HalfPoint > BotLvl) {
        OrderSend(Symbol(),OP_BUYSTOP,Lots(),NormalizeDouble(TopLvl+Ask-Bid,Digits),5,0,0,NULL,0,0,Blue);
        WasDownCross = false;
      }
    }
    if (!IsStopOrder && WasUpCross) {
      if (BotLvl+dStopLevel < Bid+HalfPoint) {
        OrderSend(Symbol(),OP_SELLSTOP,Lots(),NormalizeDouble(BotLvl,Digits),5,0,0,NULL,0,0,Yellow);
        WasUpCross = false;
      }
    }
  }
  return(0);
}
//+------------------------------------------------------------------+
double Lots() {
  return(0.1);
}
//+------------------------------------------------------------------+
double GetTopLevel(double Price) {
  int ILvl = (Price-dDelta+HalfPoint)*RecDLvl;
  return (DLvl*(ILvl+1)+dDelta);
}
//+------------------------------------------------------------------+
double GetBotLevel(double Price) {
  int ILvl = (Price-dDelta+HalfPoint)*RecDLvl;
  return (DLvl*ILvl+dDelta);
}
//+------------------------------------------------------------------+
double GetBuyStopLevel(double BuyStopLvl, double StopLvl) {
  if (Bid+StopLvl-HalfPoint > BuyStopLvl) BuyStopLvl += DLvl;
  return (BuyStopLvl+Ask-Bid);
}
//+------------------------------------------------------------------+
double GetSellStopLevel(double SellStopLvl, double StopLvl) {
  if (SellStopLvl > Bid-StopLvl+HalfPoint) SellStopLvl -= DLvl ;
  return (SellStopLvl);
}
//+------------------------------------------------------------------+