//+------------------------------------------------------------------+
//|                                                                  |  
//|                                                   Rodrigo Munhoz |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "*"
#property link      "*"
#property indicator_separate_window
#property indicator_buffers 1
#property indicator_color1 Red
#property indicator_color2 Red
#property indicator_color3 Red
#property indicator_color4 Red
//---- input parameters
extern double    Factor=2;// 
extern int       smPeriod=20;// 
extern int       smMethod=1;// 0 - SMA, 1 - EMA, 2 - SMMA, 3 - LWMA
//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
double ExtMapBuffer3[];
double ExtMapBuffer4[];
double ExtMapBuffer5[];
double ExtMapBuffer6[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   IndicatorBuffers(6);
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,ExtMapBuffer1);
   
   SetIndexBuffer(1,ExtMapBuffer2);
   SetIndexBuffer(2,ExtMapBuffer3);
   SetIndexBuffer(3,ExtMapBuffer4);  
   SetIndexBuffer(4,ExtMapBuffer5);
   SetIndexBuffer(5,ExtMapBuffer6);  
   
  
   SetIndexDrawBegin(0,smPeriod);
   SetIndexDrawBegin(1,smPeriod);  
   SetIndexDrawBegin(2,smPeriod);  
  
   SetIndexLabel(0,"AB Upper");
   SetIndexLabel(1,"AB Lower");  
   SetIndexLabel(2,"AB Central");    
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
  
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    limit=Bars-IndicatorCounted();  
  
   for(int i=limit-1;i>=0;i--)
   {
      ExtMapBuffer4[i]=High[i]*(1+Factor*(High[i]-Low[i])/((High[i]+Low[i])/2));
      ExtMapBuffer5[i]=Low[i]*(1-Factor*(High[i]-Low[i])/((High[i]+Low[i])/2));
      ExtMapBuffer6[i]=(ExtMapBuffer4[i]+ExtMapBuffer5[i])/2;
      ExtMapBuffer2[i]=iMAOnArray(ExtMapBuffer4,0,smPeriod,0,smMethod,i);
      ExtMapBuffer3[i]=iMAOnArray(ExtMapBuffer5,0,smPeriod,0,smMethod,i);
      
   }
  
   for(i=limit-1;i>=0;i--)
   {
      if(High[i]>ExtMapBuffer2[i])
         {
            ExtMapBuffer1[i]=1;
         }
      if(Low[i]<ExtMapBuffer3[i])
         {
            ExtMapBuffer1[i]=-1;
         }
      else
         {
            ExtMapBuffer1[i]=0;
         }   
   }
   
   return(0);
  }
//+------------------------------------------------------------------+