// Trend Manager.mq4
// Based on indicator sold at traderstradingsystem.com

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Red
#property indicator_color2 Blue

extern int TM_Period = 7;
extern int TM_Shift = 2;

double SpanA_Buffer[];
double SpanB_Buffer[];
int a_begin;

int init()
{
   a_begin=TM_Shift;
   SetIndexStyle(0,DRAW_HISTOGRAM,STYLE_SOLID,3);
   SetIndexBuffer(0,SpanB_Buffer);
   SetIndexDrawBegin(0,TM_Period+a_begin-1);
   SetIndexLabel(0,"TM_Period+");
   SetIndexStyle(1,DRAW_HISTOGRAM,STYLE_SOLID,3);
   SetIndexBuffer(1,SpanA_Buffer);
   SetIndexDrawBegin(1,TM_Period+a_begin-1);
   SetIndexLabel(1,"TM_Period");

   return(0);
}

int start()
{
   int    i,k;
   int    counted_bars=IndicatorCounted();
   double high,low,price;
   int rhs,rls, j, rhls;
   double weight;
   if(Bars<=TM_Period) return(0);
   if(counted_bars<1)
   {
      for(i=1;i<=TM_Period;i++) 
      {
         SpanA_Buffer[Bars-i]=0;
         SpanB_Buffer[Bars-i]=0;
      }
   }

   i=Bars-TM_Period;
   if(counted_bars>TM_Period) i=Bars-counted_bars-1;
   while(i>=0)
   {
      high=High[i]; low=Low[i]; k=i-1+TM_Period;
      while(k>=i)
      {
         price=High[k];
         if(high<price)
            { 
            high=price;
            rhs=k;
            }
            
         price=Low[k];
         if(low>price)
            {
            low=price;
            rls=k;
            }
        
         k--;
      }
      
      rhls=MathMin(rls,rhs);
      int cnt=0;
      double lw=0;
      double hg=0;
      double mid=0;
      double midsum=0;
      for(j=rhls;j>=i;j--)
         {
         hg=High[j];
         lw=Low[j];
         mid=(hg+lw)/2;
         midsum=midsum+mid;
         cnt++;
         }
         weight=NormalizeDouble(midsum/cnt,Digits);
        if (i==0)
         {
         //Alert(weight);
         //Alert(rls);
         }
      SpanA_Buffer[i]  = NormalizeDouble((high+low+weight)/3.0, Digits);
      SpanB_Buffer[i]  = SpanA_Buffer[i+TM_Shift];
      i--;
   }

   return(0);
}