//STARTHEADER
// $Id: RangeDefinition.cc,v 1.1 2008-11-06 14:32:15 ovyn Exp $
//
// Copyright (c) 2005-2007, Matteo Cacciari and Gavin Salam
//
//----------------------------------------------------------------------
// This file is part of FastJet.
//
//  FastJet is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  The algorithms that underlie FastJet have required considerable
//  development and are described in hep-ph/0512210. If you use
//  FastJet as part of work towards a scientific publication, please
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//  FastJet is distributed in the hope that it will be useful,
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//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
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//  You should have received a copy of the GNU General Public License
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//  Foundation, Inc.:
//      59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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//ENDHEADER

#include "../include/fastjet/RangeDefinition.hh"

FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh

using namespace std;
 
/// calculate, and set in _total_area, the area with a numerical test
/// takes a reasonable time with rapmax = 10, npoints = 100
void RangeDefinition::_numerical_total_area(double rapmax, int npoints) {

      int count = 0;
      double deltaphi = twopi/double(npoints);
      double deltarap = 2.0*rapmax/double(npoints);
      double phi = 0.0;
      for(int i = 0; i < npoints; i++) {
        double rap = -rapmax;
        for (int j = 0; j < npoints; j++) {
	  if ( is_in_range(rap,phi) ) { count++; }
          rap += deltarap;
        }
        phi += deltaphi;
      }

      _total_area = double(count)/double(npoints*npoints)*2.0*twopi*rapmax;
}

FASTJET_END_NAMESPACE