root/OpenSceneGraph/trunk/include/osg/Vec2d @ 10817

Revision 10817, 5.5 kB (checked in by robert, 4 years ago)

From Chris Hanson, " Adds support for Vec /= Vec and Vec *= Vec operators to Vec2/Vec3/Vec4 double and float
classes."

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  • Property svn:keywords set to Author Date Id Revision
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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under 
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSG_VEC2D
15#define OSG_VEC2D 1
16
17#include <osg/Vec2f>
18
19namespace osg {
20
21/** General purpose double pair, uses include representation of
22  * texture coordinates.
23  * No support yet added for double * Vec2d - is it necessary?
24  * Need to define a non-member non-friend operator* etc.
25  * BTW: Vec2d * double is okay
26*/
27
28class Vec2d
29{
30    public:
31
32        /** Type of Vec class.*/
33        typedef double value_type;
34
35        /** Number of vector components. */
36        enum { num_components = 2 };
37       
38        value_type _v[2];
39
40        Vec2d() {_v[0]=0.0; _v[1]=0.0;}
41
42        Vec2d(value_type x,value_type y) { _v[0]=x; _v[1]=y; }
43
44        inline Vec2d(const Vec2f& vec) { _v[0]=vec._v[0]; _v[1]=vec._v[1]; }
45       
46        inline operator Vec2f() const { return Vec2f(static_cast<float>(_v[0]),static_cast<float>(_v[1]));}
47
48
49        inline bool operator == (const Vec2d& v) const { return _v[0]==v._v[0] && _v[1]==v._v[1]; }
50
51        inline bool operator != (const Vec2d& v) const { return _v[0]!=v._v[0] || _v[1]!=v._v[1]; }
52
53        inline bool operator <  (const Vec2d& v) const
54        {
55            if (_v[0]<v._v[0]) return true;
56            else if (_v[0]>v._v[0]) return false;
57            else return (_v[1]<v._v[1]);
58        }
59
60        inline value_type* ptr() { return _v; }
61        inline const value_type* ptr() const { return _v; }
62
63        inline void set( value_type x, value_type y ) { _v[0]=x; _v[1]=y; }
64
65        inline value_type& operator [] (int i) { return _v[i]; }
66        inline value_type operator [] (int i) const { return _v[i]; }
67
68        inline value_type& x() { return _v[0]; }
69        inline value_type& y() { return _v[1]; }
70
71        inline value_type x() const { return _v[0]; }
72        inline value_type y() const { return _v[1]; }
73
74        inline bool valid() const { return !isNaN(); }
75        inline bool isNaN() const { return osg::isNaN(_v[0]) || osg::isNaN(_v[1]); }
76
77        /** Dot product. */
78        inline value_type operator * (const Vec2d& rhs) const
79        {
80            return _v[0]*rhs._v[0]+_v[1]*rhs._v[1];
81        }
82
83        /** Multiply by scalar. */
84        inline const Vec2d operator * (value_type rhs) const
85        {
86            return Vec2d(_v[0]*rhs, _v[1]*rhs);
87        }
88
89        /** Unary multiply by scalar. */
90        inline Vec2d& operator *= (value_type rhs)
91        {
92            _v[0]*=rhs;
93            _v[1]*=rhs;
94            return *this;
95        }
96
97        /** Unary multiply by vector. */
98        inline Vec2d& operator *= (const Vec2d& rhs)
99        {
100            _v[0]*=rhs[0];
101            _v[1]*=rhs[1];
102            return *this;
103        }
104
105        /** Divide by scalar. */
106        inline const Vec2d operator / (value_type rhs) const
107        {
108            return Vec2d(_v[0]/rhs, _v[1]/rhs);
109        }
110
111        /** Unary divide by scalar. */
112        inline Vec2d& operator /= (value_type rhs)
113        {
114            _v[0]/=rhs;
115            _v[1]/=rhs;
116            return *this;
117        }
118
119        /** Unary divide by vector. */
120        inline Vec2d& operator /= (const Vec2d& rhs)
121        {
122            _v[0]/=rhs[0];
123            _v[1]/=rhs[1];
124            return *this;
125        }
126
127        /** Binary vector add. */
128        inline const Vec2d operator + (const Vec2d& rhs) const
129        {
130            return Vec2d(_v[0]+rhs._v[0], _v[1]+rhs._v[1]);
131        }
132
133        /** Unary vector add. Slightly more efficient because no temporary
134          * intermediate object.
135        */
136        inline Vec2d& operator += (const Vec2d& rhs)
137        {
138            _v[0] += rhs._v[0];
139            _v[1] += rhs._v[1];
140            return *this;
141        }
142
143        /** Binary vector subtract. */
144        inline const Vec2d operator - (const Vec2d& rhs) const
145        {
146            return Vec2d(_v[0]-rhs._v[0], _v[1]-rhs._v[1]);
147        }
148
149        /** Unary vector subtract. */
150        inline Vec2d& operator -= (const Vec2d& rhs)
151        {
152            _v[0]-=rhs._v[0];
153            _v[1]-=rhs._v[1];
154            return *this;
155        }
156
157        /** Negation operator. Returns the negative of the Vec2d. */
158        inline const Vec2d operator - () const
159        {
160            return Vec2d (-_v[0], -_v[1]);
161        }
162
163        /** Length of the vector = sqrt( vec . vec ) */
164        inline value_type length() const
165        {
166            return sqrt( _v[0]*_v[0] + _v[1]*_v[1] );
167        }
168
169        /** Length squared of the vector = vec . vec */
170        inline value_type length2( void ) const
171        {
172            return _v[0]*_v[0] + _v[1]*_v[1];
173        }
174
175        /** Normalize the vector so that it has length unity.
176          * Returns the previous length of the vector.
177        */
178        inline value_type normalize()
179        {
180            value_type norm = Vec2d::length();
181            if (norm>0.0)
182            {
183                value_type inv = 1.0/norm;
184                _v[0] *= inv;
185                _v[1] *= inv;
186            }
187            return( norm );
188        }
189
190};    // end of class Vec2d
191
192}    // end of namespace osg
193#endif
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