trendlineorder.mq4

/*
Because if trendline is diagonal, the order price must be constantly modified to go along with the line. 
So if order price is needed to be constantly modified, it's the job of Expert Advisor not script, because script, 
like you said, run only one-time when you double click on it.
By the time I described to you, I've coded the expert advisor for you already, so check it out in Forward Testing 
not Backtesting. You must draw a trendline and name it tx (case sensitive). Attach the expert to the same chart 
that trendline is drawn. Then you can choose to open only Long, Short, Both, or none in the settings window. When 
bid price crosses up the trendline, buy at market price. When bid price crosses down the trendline, sell at market price.
*/

extern int       Evaluate_Interval=1; // -1 chart, 0 tick, > 0 specified min

extern double    Lots=1;
extern int       TP=150;
extern int       SL=30;

extern int       TS_Trigger=15;
extern int       TS_Mode=1;       // 0 = disabled, 1 = Fixed SL, 2 = ATR, 3 = Half Volatility
extern int       TS_Sensitivity=5;
extern double    TS_DynamicFactor=0.5;   // applied only if TrailingStopMode = 2 or 3

extern bool      Enable_Alert=false;

string expert_name = "TrendlineOrder_v1";
int bars_count = 0;
int magicnum;
int open_slippage=5;
int close_slippage=10;
datetime dtNextEvaluate;
double value1;
double bid1;
bool executed;

int init()
  {
      // код доступен только после оплаты
   }

int deinit()
  {
   return(0);
  }

int start()
{
      // код доступен только после оплаты
   }

int EnterBuy()
{

  double TrueSL, TrueTP;
  if (SL > 0) TrueSL = Ask-(SL*Point);
  if (TP > 0) TrueTP = Ask+(TP*Point);

  int ret = OrderSendEx(Symbol(), OP_BUY, Lots, Ask, open_slippage*Point, TrueSL, TrueTP, "rsx_swinger_2p1 " + Symbol() + Period(), magicnum, 0, Yellow);
  return(ret);
}

int

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