Center Of Gravity Oscillator

//+------------------------------------------------------------------+
//|                                            CG Oscillator         |
//|                         Copyright © 2006, Luis Guilherme Damiani |
//|                                      http://www.damianifx.com.br |
//|
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, Luis Guilherme Damiani"
#property link      "http://www.damianifx.com.br"

#property indicator_buffers 2
#property indicator_separate_window
//#property indicator_chart_window

#property indicator_color1 Yellow
#property indicator_color2 Blue
//#property indicator_color3 Yellow

//---- input parameters
extern double length=8;
//extern int    maxbars=2000;

extern string 
Price_Choice="-----  Typical or Median  --------------";
extern bool is_median=true;

//---- buffers
double ind1[];
double ind2[];
//double ind3[];
//double AuxBuffer[]; //Smooth

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,ind1);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,ind2);
  // SetIndexStyle(2,DRAW_LINE);
  // SetIndexBuffer(2,ind3);
   SetLevelValue(0,0.0);
//   SetLevelValue(1,-0.8);
   ArrayInitialize(ind1,0.0);
   ArrayInitialize(ind2,0.0);
//   ArrayInitialize(ind3,0.0);
///   ArrayResize(AuxBuffer,maxbars+3);
 //  ArrayInitialize(AuxBuffer,0.0);
 
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//---- 
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+

int start()
  {
   
      int    counted_bars=IndicatorCounted();
      double num=0,denom=0;  
      //---- check for possible errors
      if(counted_bars<0) return(-1);
      int limit=Bars-counted_bars;
      //if(limit>maxbars)limit=maxbars;      
      //if (limit>Bars-1)limit=Bars-1;   
      //---- 
      for (int i = limit; i>=0;i--)
      {
         num=0;denom=0;
         for(int j=0;j<length;j++)
         {            
            num=num+(1+j)*Calc_pr(i+j,is_median);
            denom=denom+Calc_pr(i+j,is_median);
         }
         if(denom!=0)         	      
	      ind1[i]=-num/denom + (1+length)/2;
         ind2[i]=ind1[i+1];	          
       }
      
//----
   return(0);
  }
  
 double Calc_pr(int x,bool pricet)
 {
    double pr;
    if(pricet)
            {
               pr=(High[x]+Low[x])/2;
            
            }
            else
            {
               pr=(High[x]+Low[x]+Close[x])/3;
            } 
  return(pr);          
 }           
//+------------------------------------------------------------------+