#property copyright "© 2007 Takbir"
#property link      "www.stigal.com"

#define major   1
#define minor   1

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Blue
#property indicator_color2 Red
#property indicator_width1  1
#property indicator_width2  1


double UpperFr[];
double LowerFr[];

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

int Bars.left = 5;
int Bars.right = 5;

void init() 
{
  SetIndexBuffer(0, UpperFr);
  SetIndexBuffer(1, LowerFr);
  
  SetIndexEmptyValue(0, 0);
  SetIndexEmptyValue(1, 0);
  
  SetIndexStyle(0, DRAW_ARROW);
  SetIndexArrow(0, 217);

  SetIndexStyle(1, DRAW_ARROW);
  SetIndexArrow(1, 218);  
}

void start() 
{
  int counted = IndicatorCounted();
  if (counted < 0) return (-1);
  if (counted > 0) counted--;
  
  int limit = Bars-counted;
  
  //-----
  
  double dy = 0;
  for (int i=1; i <= 20; i++) {
    dy += 0.3*(High[i]-Low[i])/20;
  }
  
  for (i=1+Bars.right; i <= limit+Bars.left; i++) 
  {
    UpperFr[i] = 0;
    LowerFr[i] = 0;
  
    if (IsUpperFr(i)) UpperFr[i] = High[i] + dy;
    if (IsLowerFr(i)) LowerFr[i] = Low[i] - dy;
  }
}

bool IsUpperFr(int bar) 
{
  for (int i=1; i <= Bars.left; i++) 
  {
    if (bar+i >= Bars) return (false);

    if (High[bar] < High[bar+i]) return (false);
  }

  for (i=1; i <= Bars.right; i++) 
  {
    if (bar-i < 0) return (false);

    if (High[bar] < High[bar-i]) return (false);
  }
  
  return (true);
}

bool IsLowerFr(int bar) 
{
  for (int i=1; i <= Bars.left; i++) 
  {
    if (bar+i >= Bars) return (false);

    if (Low[bar] > Low[bar+i]) return (false);
  }

  for (i=1; i <= Bars.right; i++) 
  {
    if (bar-i < 0) return (false);

    if (Low[bar] > Low[bar-i]) return (false);
  }

  return (true);
}