Claw 1.7.3
vector_2d.tpp
1/*
2 CLAW - a C++ Library Absolutely Wonderful
3
4 CLAW is a free library without any particular aim but being useful to
5 anyone.
6
7 Copyright (C) 2005-2011 Julien Jorge
8
9 This library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
13
14 This library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public
20 License along with this library; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22
23 contact: julien.jorge@gamned.org
24*/
25/**
26 * \file vector_2d.tpp
27 * \brief Implementation of claw::math::vector_2d class.
28 * \author Julien Jorge
29 */
30#include <cmath>
31
32/*----------------------------------------------------------------------------*/
33/**
34 * \brief Constructor.
35 */
36template<class T>
37claw::math::vector_2d<T>::vector_2d()
38{
39
40} // vector_2d::vector_2d() [constructor]
41
42/*----------------------------------------------------------------------------*/
43/**
44 * \brief Copy constructor.
45 */
46template<class T>
47template<class U>
48claw::math::vector_2d<T>::vector_2d(const coordinate_2d<U>& that)
49 : super(that)
50{
51
52} // vector_2d::vector_2d() [copy constructor]
53
54/*----------------------------------------------------------------------------*/
55/**
56 * \brief Construct a vector from two points.
57 */
58template<class T>
59template<class U>
60claw::math::vector_2d<T>::vector_2d
61( const coordinate_2d<U>& p1, const coordinate_2d<U>& p2 )
62 : super( p2.x - p1.x, p2.y - p1.y )
63{
64
65} // vector_2d::vector_2d() [constructor from two points]
66
67/*----------------------------------------------------------------------------*/
68/**
69 * \brief Constructor with initialization.
70 * \param _x x value.
71 * \param _y y Value.
72 */
73template<class T>
74claw::math::vector_2d<T>::vector_2d(const value_type& _x, const value_type& _y)
75 : super(_x, _y)
76{
77
78} // vector_2d::vector_2d() [constructor whit values]
79
80/*----------------------------------------------------------------------------*/
81/**
82 * \brief Gets vector length.
83 */
84template<class T>
85typename claw::math::vector_2d<T>::value_type
86claw::math::vector_2d<T>::length() const
87{
88 return std::sqrt( (this->x * this->x) + (this->y * this->y) );
89} // vector_2d::length()
90
91/*----------------------------------------------------------------------------*/
92/**
93 * \brief Normalize the vector.
94 */
95template<class T>
96void claw::math::vector_2d<T>::normalize()
97{
98 value_type l = length();
99
100 if (l != 0)
101 {
102 this->x /= l;
103 this->y /= l;
104 }
105} // vector_2d::normalize()
106
107/*----------------------------------------------------------------------------*/
108/**
109 * \brief Get a vector orthonormal to this vector.
110 */
111template<class T>
112claw::math::vector_2d<T>
113claw::math::vector_2d<T>::get_orthonormal_clockwise() const
114{
115 return self_type(this->y, -this->x);
116} // vector_2d::get_orthonormal_clockwise()
117
118/*----------------------------------------------------------------------------*/
119/**
120 * \brief Get a vector orthonormal to this vector.
121 */
122template<class T>
123claw::math::vector_2d<T>
124claw::math::vector_2d<T>::get_orthonormal_anticlockwise() const
125{
126 return self_type(-this->y, this->x);
127} // vector_2d::get_orthonormal_anticlockwise()
128
129/*----------------------------------------------------------------------------*/
130/**
131 * \brief Dot product.
132 * \param that The other operand.
133 */
134template<class T>
135typename claw::math::vector_2d<T>::value_type
136claw::math::vector_2d<T>::dot_product(const self_type& that) const
137{
138 return this->x * that.x + this->y * that.y;
139} // vector_2d::dot_product()