vector_2d.tpp

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00001 /*
00002   CLAW - a C++ Library Absolutely Wonderful
00003 
00004   CLAW is a free library without any particular aim but being useful to 
00005   anyone.
00006 
00007   Copyright (C) 2005-2008 Julien Jorge
00008 
00009   This library is free software; you can redistribute it and/or
00010   modify it under the terms of the GNU Lesser General Public
00011   License as published by the Free Software Foundation; either
00012   version 2.1 of the License, or (at your option) any later version.
00013 
00014   This library is distributed in the hope that it will be useful,
00015   but WITHOUT ANY WARRANTY; without even the implied warranty of
00016   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017   Lesser General Public License for more details.
00018 
00019   You should have received a copy of the GNU Lesser General Public
00020   License along with this library; if not, write to the Free Software
00021   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00022 
00023   contact: julien_jorge@yahoo.fr
00024 */
00030 #include <cmath>
00031 
00032 /*----------------------------------------------------------------------------*/
00036 template<class T>
00037 claw::math::vector_2d<T>::vector_2d()
00038 {
00039 
00040 } // vector_2d::vector_2d() [constructor]
00041 
00042 /*----------------------------------------------------------------------------*/
00046 template<class T>
00047 template<class U>
00048 claw::math::vector_2d<T>::vector_2d(const coordinate_2d<U>& that)
00049   : super(that)
00050 {
00051 
00052 } // vector_2d::vector_2d() [copy constructor]
00053 
00054 /*----------------------------------------------------------------------------*/
00058 template<class T>
00059 template<class U>
00060 claw::math::vector_2d<T>::vector_2d
00061 ( const coordinate_2d<U>& p1, const coordinate_2d<U>& p2 )
00062   : super( p2.x - p1.x, p2.y - p1.y )
00063 {
00064 
00065 } // vector_2d::vector_2d() [constructor from two points]
00066 
00067 /*----------------------------------------------------------------------------*/
00073 template<class T>
00074 claw::math::vector_2d<T>::vector_2d(const value_type& _x, const value_type& _y)
00075   : super(_x, _y)
00076 {
00077 
00078 } // vector_2d::vector_2d() [constructor whit values]
00079 
00080 /*----------------------------------------------------------------------------*/
00084 template<class T>
00085 typename claw::math::vector_2d<T>::value_type
00086 claw::math::vector_2d<T>::length() const
00087 {
00088   return std::sqrt( (this->x * this->x) + (this->y * this->y) ); 
00089 } // vector_2d::length()
00090 
00091 /*----------------------------------------------------------------------------*/
00095 template<class T>
00096 void claw::math::vector_2d<T>::normalize()
00097 {
00098   value_type l = length();
00099   
00100   if (l != 0)
00101     {
00102       this->x /= l;
00103       this->y /= l;
00104     }
00105 } // vector_2d::normalize()
00106 
00107 /*----------------------------------------------------------------------------*/
00111 template<class T>
00112 claw::math::vector_2d<T>
00113 claw::math::vector_2d<T>::get_orthonormal_clockwise() const
00114 {
00115   return self_type(this->y, -this->x);
00116 } // vector_2d::get_orthonormal_clockwise()
00117 
00118 /*----------------------------------------------------------------------------*/
00122 template<class T>
00123 claw::math::vector_2d<T>
00124 claw::math::vector_2d<T>::get_orthonormal_anticlockwise() const
00125 {
00126   return self_type(-this->y, this->x);
00127 } // vector_2d::get_orthonormal_anticlockwise()
00128 
00129 /*----------------------------------------------------------------------------*/
00134 template<class T>
00135 typename claw::math::vector_2d<T>::value_type
00136 claw::math::vector_2d<T>::dot_product(const self_type& that) const
00137 {       
00138   return this->x * that.x + this->y * that.y;
00139 } // vector_2d::dot_product()

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