//+------------------------------------------------------------------+
//|                                                  Velocity_v1.mq4 |
//|                           Copyright © 2005, TrendLaboratory Ltd. |
//|            http://finance.groups.yahoo.com/group/TrendLaboratory |
//|                                       E-mail: igorad2004@list.ru |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, TrendLaboratory Ltd."
#property link      "http://finance.groups.yahoo.com/group/TrendLaboratory"

#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 LightBlue
#property indicator_color2 Red
//---- input parameters
extern int VelocityPeriod=8;
extern int Slow=5;
//---- indicator buffers
double FastBuffer[];
double SlowBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
  int init()
  {
   string short_name;
//---- indicator line
   SetIndexStyle(0,DRAW_LINE);
   SetIndexStyle(1,DRAW_LINE,STYLE_DOT);
   SetIndexBuffer(0,FastBuffer);
   SetIndexBuffer(1,SlowBuffer);
   IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS));
//---- name for DataWindow and indicator subwindow label
   short_name="Velocity("+VelocityPeriod+","+Slow+")";
   IndicatorShortName(short_name);
   SetIndexLabel(0,"Fast");
   SetIndexLabel(1,"Slow");
//----
   SetIndexDrawBegin(0,VelocityPeriod);
   SetIndexDrawBegin(1,Slow);
//----
   return(0);
  }

//+------------------------------------------------------------------+
//| Velocity_v1                                                      |
//+------------------------------------------------------------------+
int start()
  {
   int    shift;
   double Vel,Vel1,Vel2,AvgVel,AvgVel1,AvgVel2,AvgVel21;
      
   for(shift=Bars-1-VelocityPeriod;shift>=0;shift--)
   {	
     Vel1=Vel;
     AvgVel1=AvgVel;
     AvgVel21=AvgVel2;
    
     Vel=(Close[shift]-Close[shift+1])/Point;
          
     AvgVel=AvgVel1+2.0/(1.0+VelocityPeriod)*(Vel-AvgVel1);
          
     AvgVel2=AvgVel21+2.0/(1.0+VelocityPeriod)*(AvgVel-AvgVel21);
	         	  
	  FastBuffer[shift]=FastBuffer[shift+1]+2.0/(1.0+VelocityPeriod)*(AvgVel2-FastBuffer[shift+1]);
	  SlowBuffer[shift]=SlowBuffer[shift+1]+2.0/(Slow+1.0)*(FastBuffer[shift]-SlowBuffer[shift+1]);
	 }
	return(0);	
 }