how to code moving levels???

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hi all
i want to know how can i code the moving levels?
 
See Controlling compilation
 
hi Rosh
i put the indicator level but there is some thing wrong

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Aqua
#property indicator_color2 Red
////////////////////////////////////////////
#property indicator_level1 30
#property indicator_level2 -30
//////////////////////////////////////////
//---- input parameters
 
extern bool   enableAlert = false;
//---- buffers
double buySignal[];
double sellSignal[];
 
static datetime lastAlertTime;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
   SetIndexStyle(0, DRAW_ARROW);
   SetIndexStyle(1, DRAW_ARROW);
   
   
   
    
   
   SetIndexBuffer(0, buySignal);
   SetIndexBuffer(1, sellSignal);
 
   SetIndexEmptyValue(0, 0.0);
   SetIndexEmptyValue(1, 0.0);
   
   SetIndexArrow(0, 233);
   SetIndexArrow(1, 234);
//----
   return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
{
   return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
   for (int i = Bars - IndicatorCounted(); i >= 0; i--)
   {
      
      double a1 = iMA(NULL, 0, 1, 0, MODE_SMA, MODE_SIGNAL,i);
      
      
      double a2 =  iHigh(NULL, 0, 0 + i);
      double a3 =  iLow(NULL, 0, 0 + i);
      
      
      
      
      
      
      
      
      
      
      
       //################################################################################ 
     
      double displacement = GetArrowDisplacement(i);
   
      if (a3<-30)
      {
         buySignal[i] = Low[i+1] - displacement;
         if (enableAlert == true && i == 0)
            SignalAlert("Buy signal On: ");
      }
      
      
      
      //*****************************************************************************
      //*****************************************************************************
      
      
      if (a2>30 )
      
      {
         sellSignal[i] = High[i+1] + displacement;
         if (enableAlert == true && i == 0)
            SignalAlert("Sell signal On: ");
      }      
      
      
      //*****************************************************************
      //*****************************************************************
      //*****************************************************************
      //*****************************************************************
      //*****************************************************************
      //*****************************************************************
      
 
   }
 
   return(0);
}
 
Sorry, it's impossible. I did mistake.
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