//+------------------------------------------------------------------+
//|                       Rodrigo Acima_Abaixo_AccelarationBands.mq4 |
//|                                                   Rodrigo Munhoz |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Rodrigo Munhoz"
#property link      "**"

#property indicator_separate_window
#property indicator_buffers 1
#property indicator_color1 White
//---- input parameters
extern double    Factor=2;// 
extern int       smPeriod=15;// 
extern int       smMethod=1;//  0 - SMA, 1 - EMA, 2 - SMMA, 3 - LWMA
double a[]; 
//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer3[];
double ExtMapBuffer4[];
double ExtMapBuffer5[];
double ExtMapBuffer6[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
  SetIndexStyle(3, DRAW_LINE, EMPTY, 2, White);
  SetIndexBuffer(0,ExtMapBuffer1);
//----
   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--)
   {
      ExtMapBuffer3[i]=High[i]*(1+Factor*(High[i]-Low[i])/((High[i]+Low[i])/2));
      ExtMapBuffer4[i]=Low[i]*(1-Factor*(High[i]-Low[i])/((High[i]+Low[i])/2));
      ExtMapBuffer5[i]=iMAOnArray(ExtMapBuffer3,0,smPeriod,0,smMethod,i);
      ExtMapBuffer6[i]=iMAOnArray(ExtMapBuffer4,0,smPeriod,0,smMethod,i);
    }
    while(i>=0)
    { 
    if(High[i]>ExtMapBuffer5[i]==true)
         {
            a[i]=1;
         }
    if(Low[i]<ExtMapBuffer6[i]==true)
         {
            a[i]=-1;
         }
    else a[i] = 0;
    i--;
    }
   return(0);
   }
        
//+------------------------------------------------------------------+