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/*
CLAW - a C++ Library Absolutely Wonderful
CLAW is a free library without any particular aim but being useful to
anyone.
Copyright (C) 2005-2011 Julien Jorge
This library is free software; 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; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
contact: julien.jorge@gamned.org
*/
/**
* \file vector_2d.tpp
* \brief Implementation of claw::math::vector_2d class.
* \author Julien Jorge
*/
#include <cmath>
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor.
*/
template<class T>
claw::math::vector_2d<T>::vector_2d()
{
} // vector_2d::vector_2d() [constructor]
/*----------------------------------------------------------------------------*/
/**
* \brief Copy constructor.
*/
template<class T>
template<class U>
claw::math::vector_2d<T>::vector_2d(const coordinate_2d<U>& that)
: super(that)
{
} // vector_2d::vector_2d() [copy constructor]
/*----------------------------------------------------------------------------*/
/**
* \brief Construct a vector from two points.
*/
template<class T>
template<class U>
claw::math::vector_2d<T>::vector_2d
( const coordinate_2d<U>& p1, const coordinate_2d<U>& p2 )
: super( p2.x - p1.x, p2.y - p1.y )
{
} // vector_2d::vector_2d() [constructor from two points]
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor with initialization.
* \param _x x value.
* \param _y y Value.
*/
template<class T>
claw::math::vector_2d<T>::vector_2d(const value_type& _x, const value_type& _y)
: super(_x, _y)
{
} // vector_2d::vector_2d() [constructor whit values]
/*----------------------------------------------------------------------------*/
/**
* \brief Gets vector length.
*/
template<class T>
typename claw::math::vector_2d<T>::value_type
claw::math::vector_2d<T>::length() const
{
return std::sqrt( (this->x * this->x) + (this->y * this->y) );
} // vector_2d::length()
/*----------------------------------------------------------------------------*/
/**
* \brief Normalize the vector.
*/
template<class T>
void claw::math::vector_2d<T>::normalize()
{
value_type l = length();
if (l != 0)
{
this->x /= l;
this->y /= l;
}
} // vector_2d::normalize()
/*----------------------------------------------------------------------------*/
/**
* \brief Get a vector orthonormal to this vector.
*/
template<class T>
claw::math::vector_2d<T>
claw::math::vector_2d<T>::get_orthonormal_clockwise() const
{
return self_type(this->y, -this->x);
} // vector_2d::get_orthonormal_clockwise()
/*----------------------------------------------------------------------------*/
/**
* \brief Get a vector orthonormal to this vector.
*/
template<class T>
claw::math::vector_2d<T>
claw::math::vector_2d<T>::get_orthonormal_anticlockwise() const
{
return self_type(-this->y, this->x);
} // vector_2d::get_orthonormal_anticlockwise()
/*----------------------------------------------------------------------------*/
/**
* \brief Dot product.
* \param that The other operand.
*/
template<class T>
typename claw::math::vector_2d<T>::value_type
claw::math::vector_2d<T>::dot_product(const self_type& that) const
{
return this->x * that.x + this->y * that.y;
} // vector_2d::dot_product()
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