cartesian_moving_point_1.h

很多二维 三维几何计算算法 C++ 类库

// Copyright (c) 2005  Stanford University (USA).
// 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 Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// 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/CGAL-3.3-branch/Kinetic_data_structures/include/CGAL/Kinetic/internal/Kernel/Cartesian_moving_point_1.h $
// $Id: Cartesian_moving_point_1.h 36907 2007-03-08 01:47:03Z drussel $
// 
//
// Author(s)     : Daniel Russel <[e-mail]>

#ifndef CGAL_KINETIC_CARTESIAN_MOVING_POINT_1_H_
#define CGAL_KINETIC_CARTESIAN_MOVING_POINT_1_H_
#include <CGAL/Kinetic/basic.h>
#include <iostream>

CGAL_KINETIC_BEGIN_INTERNAL_NAMESPACE;

template <class Coordinate_t>
class Cartesian_moving_point_1
{
protected:
  typedef Cartesian_moving_point_1<Coordinate_t> This;
public:
  //! The type for coordinate values
  typedef Coordinate_t Coordinate;

  //! What should I do for this
  typedef typename Coordinate::NT NT;

  //! initialize it from polys
  Cartesian_moving_point_1(const Coordinate &x) {
    _coord=x;
  }

  //! initialize it from a still point
  template <class Static_point>
  Cartesian_moving_point_1(const Static_point &pt) {
    _coord=pt.x();
  }

  //! null
  Cartesian_moving_point_1(){}

  bool operator==(const Cartesian_moving_point_1 &o) const {
    return x() == o.x();
  }

  //! homogeneous x
  const Coordinate &hx() const
  {
    return _coord;
  }

  //! homogeneous w
  const Coordinate hw() const
  {
    return Coordinate(1);
  }

  //! x
  const Coordinate &x() const
  {
    return _coord;
  }

  bool is_constant() const {
    return _coord.degree()<1;
  }
  
  template <class SK>
  struct Static_traits
  {
    typedef typename SK::RT Static_type;

    static Static_type to_static(const This &o, const typename SK::FT &t, const SK &) {
      return Static_type(o.x()(t));
    }
  };

  template <class Converter>
  struct Coordinate_converter
  {
    Coordinate_converter(const Converter &c): c_(c){}
    typedef Cartesian_moving_point_1<typename Converter::argument_type> argument_type;
    typedef Cartesian_moving_point_1<typename Converter::result_type> result_type;

    result_type operator()(const argument_type &i) const
    {
      return result_type(c_(i.x()));
    }

    Converter c_;
  };

  //! Reverse the motion, time must be negated also
  template <class Negate>
  This transformed_coordinates(const Negate &n) const
  {
    return This(n(_coord));
  }

  void write(std::ostream &out) const
  {
    out << x();
  }

protected:
  Coordinate _coord;
};

template <class Coordinate>
inline std::ostream &operator<<(std::ostream &out,
				const Cartesian_moving_point_1<Coordinate> &point)
{
  point.write(out);
  return out;
}

template <class Coordinate>
inline std::istream &operator>>(std::istream &out,
				Cartesian_moving_point_1<Coordinate> &point)
{
  Coordinate c;
  out >> c;
  if (!out.fail()) {
    point = Cartesian_moving_point_1<Coordinate>(c);
  }
  return out;
}


CGAL_KINETIC_END_INTERNAL_NAMESPACE

CGAL_KINETIC_BEGIN_NAMESPACE

/*template <>
  template <class Coord, class SK>
  class To_static< internal::Cartesian_moving_point_2<Coord>, SK>:
  public To_static_base<typename Coord::NT,
  typename internal::Cartesian_moving_point_2<Coord>,
  typename SK::Point_2> {
  typedef To_static_base<typename Coord::NT,
  typename internal::Cartesian_moving_point_2<Coord>,
  typename SK::Point_2>  P;
  public:
  To_static(){}
  typename P::result_type operator()(const typename P::argument_type &arg) const {
  return typename P::result_type(arg.x()(P::time()),
  arg.y()(P::time()));
  }
  };*/
CGAL_KINETIC_END_NAMESPACE
#endif