root/OpenSceneGraph/trunk/include/osgSim/GeographicLocation @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2004 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 OSGSIM_GEOGRAPHICLOCATION
15#define OSGSIM_GEOGRAPHICLOCATION 1
16
17#include <osg/Math>
18#include <osg/Referenced>
19
20#include <ostream>
21
22namespace osgSim {
23
24/** Stores a double precision geographic location, latitude and longitude.
25    Derived from Referenced so it can be used as an osg::Object userData.
26*/
27
28class GeographicLocation : public osg::Referenced
29{
30    public:
31
32        GeographicLocation() { _v[0]=0.; _v[1]=0.; }
33        GeographicLocation( double lat, double lon ) { _v[0]=lat; _v[1]=lon; }
34
35        inline bool operator == ( const GeographicLocation& v) const { return _v[0]==v._v[0] && _v[1]==v._v[1]; }
36        inline bool operator != ( const GeographicLocation& v) const { return _v[0]!=v._v[0] || _v[1]!=v._v[1]; }
37        inline bool operator < ( const GeographicLocation& v) const
38        {
39            if (_v[0]<v._v[0]) return true;
40            else if (_v[0]>v._v[0]) return false;
41            else if (_v[1]<v._v[1]) return true;
42            else return false;
43        }
44
45        inline double* ptr() { return _v; }
46        inline const double* ptr() const { return _v; }
47
48        inline void set( double lat, double lon ) { _v[0]=lat; _v[1]=lon; }
49
50        inline double& latitude() { return _v[0]; }
51        inline double& longitude() { return _v[1]; }
52
53        inline double latitude() const { return _v[0]; }
54        inline double longitude() const { return _v[1]; }
55
56        inline bool valid() const { return !isNaN(); }
57        inline bool isNaN() const { return osg::isNaN(_v[0]) || osg::isNaN(_v[1]); }
58
59        /// binary vector add
60        inline const GeographicLocation operator+( const GeographicLocation& rhs) const
61        {
62            return GeographicLocation(_v[0]+rhs._v[0], _v[1]+rhs._v[1]);
63        }
64
65        /// binary vector subtract
66        inline const GeographicLocation operator-( const GeographicLocation& rhs) const
67        {
68            return GeographicLocation(_v[0]-rhs._v[0], _v[1]-rhs._v[1]);
69        }
70
71        friend inline std::ostream& operator << (std::ostream& output, const GeographicLocation& loc)
72        {
73            output << loc._v[0] << " " << loc._v[1];
74            return output;  // to enable cascading
75        }
76
77    private:
78        // Note the convention is to store lat in _v[0] and lon in _v[1].
79        // This is contrary to typical X-Y convention. Who decided lat should come
80        //   before lon anyway? I'd like a word with him...
81        double _v[2];
82
83};  // end of class GeographicLocation
84
85}   // end of namespace osgSim
86
87#endif
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