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// Copyright (c) 2009 INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// 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 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/next/Mesh_3/include/CGAL/Mesh_3/implicit_to_labeled_function_wrapper.h $
// $Id: implicit_to_labeled_function_wrapper.h 67117 2012-01-13 18:14:48Z lrineau $
//
//
// Author(s) : Stéphane Tayeb
//
//******************************************************************************
// File Description :
// Implicit_to_labeled_function_wrapper and
// Implicit_vector_to_labeled_function_wrapper class declaration
// and implementation.
//
// See classes description to have more information.
//******************************************************************************
#ifndef CGAL_MESH_3_IMPLICIT_TO_LABELED_FUNCTION_WRAPPER_H
#define CGAL_MESH_3_IMPLICIT_TO_LABELED_FUNCTION_WRAPPER_H
namespace CGAL {
namespace Mesh_3 {
/**
* @class Implicit_to_labeled_function_wrapper
*
* This class is designed to wrap an implicit function which describes a domain
* by [p is inside if f(p)<0] to a function which takes its values into {0,1}.
* f(p)=0 means that p is outside the domain.
*/
template<class Function_, class BGT>
class Implicit_to_labeled_function_wrapper
{
public:
// Types
typedef int return_type;
typedef typename BGT::Point_3 Point_3;
/// Constructor
Implicit_to_labeled_function_wrapper(Function_& f)
: r_f_(f) {}
// Default copy constructor and assignment operator are ok
/// Destructor
~Implicit_to_labeled_function_wrapper() {}
/// Operator ()
return_type operator()(const Point_3& p, const bool = true) const
{
return ( (r_f_(p)<0) ? 1 : 0 );
}
private:
/// Function to wrap
Function_& r_f_;
}; // end class Implicit_to_labeled_function_wrapper
/**
* @class Implicit_vector_to_labeled_function_wrapper
*
* Wraps a set of implicit function [f1,f2,...] to one function F which
* takes its values into N.
*
* Let p be a point.
* F(p) = 0b000000(f2(p)<0)(f1(p)<0)
*
* It can handle at most 8 functions.
*/
template<class Function_, class BGT>
class Implicit_vector_to_labeled_function_wrapper
{
public:
// Types
typedef int return_type;
typedef std::vector<Function_*> Function_vector;
typedef typename BGT::Point_3 Point_3;
/// Constructor
Implicit_vector_to_labeled_function_wrapper(const std::vector<Function_*>& v)
: function_vector_(v) {}
// Default copy constructor and assignment operator are ok
/// Destructor
~Implicit_vector_to_labeled_function_wrapper() {}
/// Operator ()
return_type operator()(const Point_3& p, const bool = true) const
{
int nb_func = function_vector_.size();
if ( nb_func > 8 )
{
CGAL_error_msg("We support at most 8 functions !");
}
char bits = 0;
for ( int i = 0 ; i < nb_func ; ++i )
{
// Insert value into bits : we compute fi(p) and insert result at
// bit i of bits
bits |= ( ((*function_vector_[i])(p) < 0) << i );
}
return ( static_cast<return_type>(bits) );
}
private:
/// Functions to wrap
const Function_vector function_vector_;
}; // end class Implicit_to_labeled_function_wrapper
} // end namespace Mesh_3
} // end namespace CGAL
#endif // CGAL_MESH_3_IMPLICIT_TO_LABELED_FUNCTION_WRAPPER_H
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