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// Copyright (c) 2007-2008 INRIA (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/Poisson_surface_reconstruction_3/include/CGAL/Lightweight_vector_3.h $
// $Id: include/CGAL/Lightweight_vector_3.h 08b27d3db14 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Laurent Saboret, Pierre Alliez
#ifndef CGAL_LIGHTWEIGHT_VECTOR_3_H
#define CGAL_LIGHTWEIGHT_VECTOR_3_H
#include <CGAL/license/Poisson_surface_reconstruction_3.h>
#include <CGAL/Vector_3.h>
#include <CGAL/Origin.h>
namespace CGAL {
/// \internal
/// The Lightweight_vector_3 class represents a 3D vector (oriented).
/// The purpose of this class is to save memory as the actual vector
/// is allocated only when needed.
///
/// \cgalModels{Kernel::Vector_3}
///
/// @tparam Gt Geometric traits class.
template<class Gt>
class Lightweight_vector_3
{
// Public types
public:
typedef Gt Geom_traits; ///< Geometric traits class
typedef typename Geom_traits::FT FT;
typedef typename Geom_traits::RT RT;
typedef typename Geom_traits::Vector_3 Vector; ///< Kernel's Vector_3 class.
// Public methods
public:
/// Vector is (0,0,0) by default.
Lightweight_vector_3(Null_vector = NULL_VECTOR)
{
m_pVector = nullptr;
}
Lightweight_vector_3(const Vector& vector)
{
m_pVector = new Vector(vector);
}
Lightweight_vector_3(FT x, FT y, FT z)
{
m_pVector = new Vector(x,y,z);
}
Lightweight_vector_3(RT hx, RT hy, RT hz, RT hw)
{
m_pVector = new Vector(hx,hy,hz,hw);
}
/// Copy constructor
Lightweight_vector_3(const Lightweight_vector_3& that)
{
m_pVector = (that.m_pVector == nullptr) ? nullptr : new Vector(*that.m_pVector);
}
template <class K>
Lightweight_vector_3(const Lightweight_vector_3<K>& that)
{
Vector vector = that.get_vector();
m_pVector = (vector == NULL_VECTOR) ? nullptr : new Vector(vector);
}
/// Operator =()
Lightweight_vector_3& operator=(const Lightweight_vector_3& that)
{
if (m_pVector != nullptr && that.m_pVector != nullptr)
{
*m_pVector = *that.m_pVector;
}
else
{
delete m_pVector;
m_pVector = (that.m_pVector == nullptr) ? nullptr : new Vector(*that.m_pVector);
}
return *this;
}
/// Destructor
~Lightweight_vector_3()
{
delete m_pVector; m_pVector = nullptr;
}
/// Compare vectors
bool operator==(const Lightweight_vector_3& that)
{
return Vector(*this) == Vector(that);
}
bool operator!=(const Lightweight_vector_3& that)
{
return ! (*this == that);
}
/// Gets (a copy of) the actual vector.
operator Vector() const
{
if (m_pVector != nullptr)
return *m_pVector;
else
return NULL_VECTOR;
}
Vector get_vector() const
{
return *this;
}
FT x() const { return (m_pVector != nullptr) ? m_pVector->x() : 0; }
FT y() const { return (m_pVector != nullptr) ? m_pVector->y() : 0; }
FT z() const { return (m_pVector != nullptr) ? m_pVector->z() : 0; }
RT hx() const { return (m_pVector != nullptr) ? m_pVector->hx() : 0; }
RT hy() const { return (m_pVector != nullptr) ? m_pVector->hy() : 0; }
RT hz() const { return (m_pVector != nullptr) ? m_pVector->hz() : 0; }
RT hw() const { return (m_pVector != nullptr) ? m_pVector->hw() : 1; }
FT cartesian(int i) const
{
if (m_pVector != nullptr)
return m_pVector->cartesian(i);
else
return 0;
}
FT operator[](int i) const
{
if (m_pVector != nullptr)
return (*m_pVector)[i];
else if (i != 3)
return 0;
else
return 1;
}
RT homogeneous(int i) const
{
if (m_pVector != nullptr)
return m_pVector->homogeneous();
else if (i != 3)
return 0;
else
return 1;
}
int dimension() const { return 3; }
Vector operator+(const Vector& that) const
{
return Vector(*this) + Vector(that);
}
Vector operator-(const Vector& that) const
{
return Vector(*this) - Vector(that);
}
FT operator*(const Vector& that) const
{
return Vector(*this) * Vector(that);
}
Vector operator-() const
{
if (m_pVector != nullptr)
return -(*m_pVector);
else
return NULL_VECTOR;
}
Vector operator/(RT c) const
{
if (m_pVector != nullptr)
return (*m_pVector) / c;
else
return NULL_VECTOR;
}
Vector operator*(FT c) const
{
if (m_pVector != nullptr)
return (*m_pVector) * c;
else
return NULL_VECTOR;
}
friend Vector operator*(FT c, const Lightweight_vector_3& vector)
{
return vector * c;
}
FT squared_length() const
{
if (m_pVector != nullptr)
return m_pVector->squared_length();
else
return 0;
}
// Data
private:
Vector* m_pVector; // Vector (optional to save memory)
};
} //namespace CGAL
#endif //CGAL_LIGHTWEIGHT_VECTOR_3_H
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