1 // Copyright (C) 2006 Mathias Froehlich - Mathias.Froehlich@web.de
3 // This library is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU Library General Public
5 // License as published by the Free Software Foundation; either
6 // version 2 of the License, or (at your option) any later version.
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 GNU
11 // Library General Public License for more details.
13 // You should have received a copy of the GNU Library General Public
14 // License along with this library; if not, write to the
15 // Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 // Boston, MA 02111-1307, USA.
22 #include <simgear/constants.h>
24 // #define SG_GEOC_NATIVE_DEGREE
26 /// Class representing a geocentric location
29 /// Default constructor, initializes the instance to lat = lon = lat = 0
31 /// Initialize from a cartesian vector assumed to be in meters
32 /// Note that this conversion is relatively expensive to compute
33 SGGeoc(const SGVec3<double>& cart);
34 /// Initialize from a geodetic position
35 /// Note that this conversion is relatively expensive to compute
36 SGGeoc(const SGGeod& geod);
38 /// Factory from angular values in radians and radius in ft
39 static SGGeoc fromRadFt(double lon, double lat, double radius);
40 /// Factory from angular values in degrees and radius in ft
41 static SGGeoc fromDegFt(double lon, double lat, double radius);
42 /// Factory from angular values in radians and radius in m
43 static SGGeoc fromRadM(double lon, double lat, double radius);
44 /// Factory from angular values in degrees and radius in m
45 static SGGeoc fromDegM(double lon, double lat, double radius);
47 /// Return the geocentric longitude in radians
48 double getLongitudeRad(void) const;
49 /// Set the geocentric longitude from the argument given in radians
50 void setLongitudeRad(double lon);
52 /// Return the geocentric longitude in degrees
53 double getLongitudeDeg(void) const;
54 /// Set the geocentric longitude from the argument given in degrees
55 void setLongitudeDeg(double lon);
57 /// Return the geocentric latitude in radians
58 double getLatitudeRad(void) const;
59 /// Set the geocentric latitude from the argument given in radians
60 void setLatitudeRad(double lat);
62 /// Return the geocentric latitude in degrees
63 double getLatitudeDeg(void) const;
64 /// Set the geocentric latitude from the argument given in degrees
65 void setLatitudeDeg(double lat);
67 /// Return the geocentric radius in meters
68 double getRadiusM(void) const;
69 /// Set the geocentric radius from the argument given in meters
70 void setRadiusM(double radius);
72 /// Return the geocentric radius in feet
73 double getRadiusFt(void) const;
74 /// Set the geocentric radius from the argument given in feet
75 void setRadiusFt(double radius);
78 /// This one is private since construction is not unique if you do
79 /// not know the units of the arguments, use the factory methods for
81 SGGeoc(double lon, double lat, double radius);
83 /// The actual data, angles in degree, radius in meters
84 /// The rationale for storing the values in degrees is that most code places
85 /// in flightgear/terragear use degrees as a nativ input and output value.
86 /// The places where it makes sense to use radians is when we convert
87 /// to other representations or compute rotation matrices. But both tasks
88 /// are computionally intensive anyway and that additional 'toRadian'
89 /// conversion does not hurt too much
96 SGGeoc::SGGeoc(void) :
97 _lon(0), _lat(0), _radius(0)
102 SGGeoc::SGGeoc(double lon, double lat, double radius) :
103 _lon(lon), _lat(lat), _radius(radius)
108 SGGeoc::SGGeoc(const SGVec3<double>& cart)
110 SGGeodesy::SGCartToGeoc(cart, *this);
114 SGGeoc::SGGeoc(const SGGeod& geod)
117 SGGeodesy::SGGeodToCart(geod, cart);
118 SGGeodesy::SGCartToGeoc(cart, *this);
123 SGGeoc::fromRadFt(double lon, double lat, double radius)
125 #ifdef SG_GEOC_NATIVE_DEGREE
126 return SGGeoc(lon*SGD_RADIANS_TO_DEGREES, lat*SGD_RADIANS_TO_DEGREES,
127 radius*SG_FEET_TO_METER);
129 return SGGeoc(lon, lat, radius*SG_FEET_TO_METER);
135 SGGeoc::fromDegFt(double lon, double lat, double radius)
137 #ifdef SG_GEOC_NATIVE_DEGREE
138 return SGGeoc(lon, lat, radius*SG_FEET_TO_METER);
140 return SGGeoc(lon*SGD_DEGREES_TO_RADIANS, lat*SGD_DEGREES_TO_RADIANS,
141 radius*SG_FEET_TO_METER);
147 SGGeoc::fromRadM(double lon, double lat, double radius)
149 #ifdef SG_GEOC_NATIVE_DEGREE
150 return SGGeoc(lon*SGD_RADIANS_TO_DEGREES, lat*SGD_RADIANS_TO_DEGREES,
153 return SGGeoc(lon, lat, radius);
159 SGGeoc::fromDegM(double lon, double lat, double radius)
161 #ifdef SG_GEOC_NATIVE_DEGREE
162 return SGGeoc(lon, lat, radius);
164 return SGGeoc(lon*SGD_DEGREES_TO_RADIANS, lat*SGD_DEGREES_TO_RADIANS,
171 SGGeoc::getLongitudeRad(void) const
173 #ifdef SG_GEOC_NATIVE_DEGREE
174 return _lon*SGD_DEGREES_TO_RADIANS;
182 SGGeoc::setLongitudeRad(double lon)
184 #ifdef SG_GEOC_NATIVE_DEGREE
185 _lon = lon*SGD_RADIANS_TO_DEGREES;
193 SGGeoc::getLongitudeDeg(void) const
195 #ifdef SG_GEOC_NATIVE_DEGREE
198 return _lon*SGD_DEGREES_TO_RADIANS;
204 SGGeoc::setLongitudeDeg(double lon)
206 #ifdef SG_GEOC_NATIVE_DEGREE
209 _lon = lon*SGD_RADIANS_TO_DEGREES;
215 SGGeoc::getLatitudeRad(void) const
217 #ifdef SG_GEOC_NATIVE_DEGREE
218 return _lat*SGD_DEGREES_TO_RADIANS;
226 SGGeoc::setLatitudeRad(double lat)
228 #ifdef SG_GEOC_NATIVE_DEGREE
229 _lat = lat*SGD_RADIANS_TO_DEGREES;
237 SGGeoc::getLatitudeDeg(void) const
239 #ifdef SG_GEOC_NATIVE_DEGREE
242 return _lat*SGD_DEGREES_TO_RADIANS;
248 SGGeoc::setLatitudeDeg(double lat)
250 #ifdef SG_GEOC_NATIVE_DEGREE
253 _lat = lat*SGD_RADIANS_TO_DEGREES;
259 SGGeoc::getRadiusM(void) const
266 SGGeoc::setRadiusM(double radius)
273 SGGeoc::getRadiusFt(void) const
275 return _radius*SG_METER_TO_FEET;
280 SGGeoc::setRadiusFt(double radius)
282 _radius = radius*SG_FEET_TO_METER;
285 /// Output to an ostream
286 template<typename char_type, typename traits_type>
288 std::basic_ostream<char_type, traits_type>&
289 operator<<(std::basic_ostream<char_type, traits_type>& s, const SGGeoc& g)
291 return s << "lon = " << g.getLongitudeDeg()
292 << ", lat = " << g.getLatitudeDeg()
293 << ", radius = " << g.getRadiusM();