//+------------------------------------------------------------------+
//|                                                       Bezier.mq4 |
//|                      Copyright © 2007, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007, MetaQuotes Software Corp."
#property link      "Lizhniyk E"

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Aqua

//---- input parameters
extern int period=8;
extern double t=0.5;
extern int shift=0;
extern int  Price=0;
double Ext[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,Ext);
   SetIndexLabel(0,"Bezier("+period+","+t+")");
   SetIndexShift(0,shift);
   SetIndexDrawBegin(0,period);
   
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    counted_bars=IndicatorCounted(); 
//----

 for(int j=0;j<Bars-counted_bars;j++)
 {
 double r=0;
   for(int i=period;i>=0;i--)
    {
    r+=pr(Price,j+i) * 
     (fact(period)/(fact(i)*fact(period-i))) * 
      MathPow(t,i) * 
       MathPow(1-t,period-i);
    }
  Ext[j]=r;
  }  
//----
   return(0);
  }
//+------------------------------------------------------------------+
double fact(int value)
{
double res=1;
for(double j=2;j<value+1;j++)
 {
 res*=j;
 } 
return (res); 
}

double pr(int Price,int n)
{
switch (Price)
 {
 case 0: {return(Close[n]);break;} 
 case 1: {return(Open[n]);break;}
 case 2: {return(High[n]);break;}
 case 3: {return(Low[n]);break;}
 case 4: {return((High[n]+Low[n])/2);break;}
 case 5: {return((High[n]+Low[n]+Close[n])/3);break;}
 case 6: {return((High[n]+Low[n]+Close[n]+Close[n])/4);break;}
 case 7: {return(iMA(Symbol(),0,4,0,0,0,n));break;}
 }
}