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int init() {

//--- enable object create events
   ChartSetInteger(ChartID(),CHARTEVENT_OBJECT_DRAG,true);

   SupportResistance();

}


int start() {

   // does price fall within support and resistance horizontal lines set on chart
   bool valSupportResistance=(Bid>GlobalVariableGet(Symbol()+"Support") && Bid<GlobalVariableGet(Symbol()+"Resistance"));

   if (valSupportResistance) {

	..... do trade stuff here
   }

}


// darw support resistance lines based on globalvars
void SupportResistance() {

   string Support=Symbol()+"Support";
   string Resistance=Symbol()+"Resistance";

   if(!GlobalVariableCheck(Support)) {
      GlobalVariableSet(Support, Bid-Point*1000);
   }
   if(!GlobalVariableCheck(Resistance)) {
      GlobalVariableSet(Resistance, Bid+Point*1000);
   }
   
   ObjectCreate(Support, OBJ_HLINE, 0, Time[0], GlobalVariableGet(Support));
   ObjectSet(Support, OBJPROP_STYLE, STYLE_SOLID);
   ObjectSet(Support, OBJPROP_COLOR, Blue);
   ObjectSet(Support, OBJPROP_WIDTH, 2);
   
   ObjectCreate(Resistance, OBJ_HLINE, 0, Time[0], GlobalVariableGet(Resistance));
   ObjectSet(Resistance, OBJPROP_STYLE, STYLE_SOLID);
   ObjectSet(Resistance, OBJPROP_COLOR, Red);
   ObjectSet(Resistance, OBJPROP_WIDTH, 2);
   
}


//+------------------------------------------------------------------+
//| ChartEvent function                                              |
//+------------------------------------------------------------------+
void OnChartEvent(const int id,         // Event identifier  
                  const long& lparam,   // Event parameter of long type
                  const double& dparam, // Event parameter of double type
                  const string& sparam) // Event parameter of string type
  {


//--- the object has been moved or its anchor point coordinates has been changed

   string Support=Symbol()+"Support";
   string Resistance=Symbol()+"Resistance";

   if(id==CHARTEVENT_OBJECT_DRAG)
     {
      //Print("The anchor point coordinates of the object with name ",sparam," has been changed");
      if(sparam==Support) {
//         Print(ObjectGetDouble(0, Support, OBJPROP_PRICE));
         GlobalVariableSet(Support, ObjectGetDouble(0, Support, OBJPROP_PRICE));
      }
      if(sparam==Resistance) {
//         Print(ObjectGetDouble(0, Resistance, OBJPROP_PRICE));
         GlobalVariableSet(Resistance, ObjectGetDouble(0, Resistance, OBJPROP_PRICE));
      }
     }
  }