root/OpenSceneGraph/trunk/include/osg/Vec2f @ 13041

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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_VEC2F
15#define OSG_VEC2F 1
16
17#include <osg/Math>
18
19namespace osg {
20
21/** General purpose float pair. Uses include representation of
22  * texture coordinates.
23  * No support yet added for float * Vec2f - is it necessary?
24  * Need to define a non-member non-friend operator* etc.
25  * BTW: Vec2f * float is okay
26*/
27
28class Vec2f
29{
30    public:
31
32        /** Data type of vector components.*/
33        typedef float value_type;
34
35        /** Number of vector components. */
36        enum { num_components = 2 };
37
38        /** Vec member variable. */
39        value_type _v[2];
40
41
42        /** Constructor that sets all components of the vector to zero */
43        Vec2f() {_v[0]=0.0; _v[1]=0.0;}
44        Vec2f(value_type x,value_type y) { _v[0]=x; _v[1]=y; }
45
46
47        inline bool operator == (const Vec2f& v) const { return _v[0]==v._v[0] && _v[1]==v._v[1]; }
48
49        inline bool operator != (const Vec2f& v) const { return _v[0]!=v._v[0] || _v[1]!=v._v[1]; }
50
51        inline bool operator <  (const Vec2f& v) const
52        {
53            if (_v[0]<v._v[0]) return true;
54            else if (_v[0]>v._v[0]) return false;
55            else return (_v[1]<v._v[1]);
56        }
57
58        inline value_type * ptr() { return _v; }
59        inline const value_type * ptr() const { return _v; }
60
61        inline void set( value_type x, value_type y ) { _v[0]=x; _v[1]=y; }
62
63        inline value_type & operator [] (int i) { return _v[i]; }
64        inline value_type operator [] (int i) const { return _v[i]; }
65
66        inline value_type & x() { return _v[0]; }
67        inline value_type & y() { return _v[1]; }
68
69        inline value_type x() const { return _v[0]; }
70        inline value_type y() const { return _v[1]; }
71
72        /** Returns true if all components have values that are not NaN. */
73        inline bool valid() const { return !isNaN(); }
74        /** Returns true if at least one component has value NaN. */
75        inline bool isNaN() const { return osg::isNaN(_v[0]) || osg::isNaN(_v[1]); }
76
77        /** Dot product. */
78        inline value_type operator * (const Vec2f& rhs) const
79        {
80            return _v[0]*rhs._v[0]+_v[1]*rhs._v[1];
81        }
82
83        /** Multiply by scalar. */
84        inline const Vec2f operator * (value_type rhs) const
85        {
86            return Vec2f(_v[0]*rhs, _v[1]*rhs);
87        }
88
89        /** Unary multiply by scalar. */
90        inline Vec2f& operator *= (value_type rhs)
91        {
92            _v[0]*=rhs;
93            _v[1]*=rhs;
94            return *this;
95        }
96
97        /** Divide by scalar. */
98        inline const Vec2f operator / (value_type rhs) const
99        {
100            return Vec2f(_v[0]/rhs, _v[1]/rhs);
101        }
102
103        /** Unary divide by scalar. */
104        inline Vec2f& operator /= (value_type rhs)
105        {
106            _v[0]/=rhs;
107            _v[1]/=rhs;
108            return *this;
109        }
110
111        /** Binary vector add. */
112        inline const Vec2f operator + (const Vec2f& rhs) const
113        {
114            return Vec2f(_v[0]+rhs._v[0], _v[1]+rhs._v[1]);
115        }
116
117        /** Unary vector add. Slightly more efficient because no temporary
118          * intermediate object.
119        */
120        inline Vec2f& operator += (const Vec2f& rhs)
121        {
122            _v[0] += rhs._v[0];
123            _v[1] += rhs._v[1];
124            return *this;
125        }
126
127        /** Binary vector subtract. */
128        inline const Vec2f operator - (const Vec2f& rhs) const
129        {
130            return Vec2f(_v[0]-rhs._v[0], _v[1]-rhs._v[1]);
131        }
132
133        /** Unary vector subtract. */
134        inline Vec2f& operator -= (const Vec2f& rhs)
135        {
136            _v[0]-=rhs._v[0];
137            _v[1]-=rhs._v[1];
138            return *this;
139        }
140
141        /** Negation operator. Returns the negative of the Vec2f. */
142        inline const Vec2f operator - () const
143        {
144            return Vec2f (-_v[0], -_v[1]);
145        }
146
147        /** Length of the vector = sqrt( vec . vec ) */
148        inline value_type length() const
149        {
150            return sqrtf( _v[0]*_v[0] + _v[1]*_v[1] );
151        }
152
153        /** Length squared of the vector = vec . vec */
154        inline value_type length2( void ) const
155        {
156            return _v[0]*_v[0] + _v[1]*_v[1];
157        }
158
159        /** Normalize the vector so that it has length unity.
160          * Returns the previous length of the vector.
161        */
162        inline value_type normalize()
163        {
164            value_type norm = Vec2f::length();
165            if (norm>0.0)
166            {
167                value_type inv = 1.0f/norm;
168                _v[0] *= inv;
169                _v[1] *= inv;
170            }
171            return( norm );
172        }
173
174};    // end of class Vec2f
175
176/** multiply by vector components. */
177inline Vec2f componentMultiply(const Vec2f& lhs, const Vec2f& rhs)
178{
179    return Vec2f(lhs[0]*rhs[0], lhs[1]*rhs[1]);
180}
181
182/** divide rhs components by rhs vector components. */
183inline Vec2f componentDivide(const Vec2f& lhs, const Vec2f& rhs)
184{
185    return Vec2f(lhs[0]/rhs[0], lhs[1]/rhs[1]);
186}
187
188}    // end of namespace osg
189#endif
190
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