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 General Public License
14 // along with this program; if not, write to the Free Software
15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 #include <simgear/constants.h>
23 // #define SG_GEOC_NATIVE_DEGREE
25 /// Class representing a geocentric location
28 /// Default constructor, initializes the instance to lat = lon = lat = 0
31 /// Factory from angular values in radians and radius in ft
32 static SGGeoc fromRadFt(double lon, double lat, double radius);
33 /// Factory from angular values in degrees and radius in ft
34 static SGGeoc fromDegFt(double lon, double lat, double radius);
35 /// Factory from angular values in radians and radius in m
36 static SGGeoc fromRadM(double lon, double lat, double radius);
37 /// Factory from angular values in degrees and radius in m
38 static SGGeoc fromDegM(double lon, double lat, double radius);
39 /// Factory to convert position from a cartesian position assumed to be
40 /// in wgs84 measured in meters
41 /// Note that this conversion is relatively expensive to compute
42 static SGGeoc fromCart(const SGVec3<double>& cart);
43 /// Factory to convert position from a geodetic position
44 /// Note that this conversion is relatively expensive to compute
45 static SGGeoc fromGeod(const SGGeod& geod);
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);
77 SGGeoc advanceRadM(double course, double distance) const;
78 static double courseRad(const SGGeoc& from, const SGGeoc& to);
79 static double courseDeg(const SGGeoc& from, const SGGeoc& to);
80 static double distanceM(const SGGeoc& from, const SGGeoc& to);
82 // Compare two geocentric positions for equality
83 bool operator == ( const SGGeoc & other ) const;
85 /// This one is private since construction is not unique if you do
86 /// not know the units of the arguments, use the factory methods for
88 SGGeoc(double lon, double lat, double radius);
90 /// The actual data, angles in degree, radius in meters
91 /// The rationale for storing the values in degrees is that most code places
92 /// in flightgear/terragear use degrees as a nativ input and output value.
93 /// The places where it makes sense to use radians is when we convert
94 /// to other representations or compute rotation matrices. But both tasks
95 /// are computionally intensive anyway and that additional 'toRadian'
96 /// conversion does not hurt too much
103 SGGeoc::SGGeoc(void) :
104 _lon(0), _lat(0), _radius(0)
109 SGGeoc::SGGeoc(double lon, double lat, double radius) :
110 _lon(lon), _lat(lat), _radius(radius)
116 SGGeoc::fromRadFt(double lon, double lat, double radius)
118 #ifdef SG_GEOC_NATIVE_DEGREE
119 return SGGeoc(lon*SGD_RADIANS_TO_DEGREES, lat*SGD_RADIANS_TO_DEGREES,
120 radius*SG_FEET_TO_METER);
122 return SGGeoc(lon, lat, radius*SG_FEET_TO_METER);
128 SGGeoc::fromDegFt(double lon, double lat, double radius)
130 #ifdef SG_GEOC_NATIVE_DEGREE
131 return SGGeoc(lon, lat, radius*SG_FEET_TO_METER);
133 return SGGeoc(lon*SGD_DEGREES_TO_RADIANS, lat*SGD_DEGREES_TO_RADIANS,
134 radius*SG_FEET_TO_METER);
140 SGGeoc::fromRadM(double lon, double lat, double radius)
142 #ifdef SG_GEOC_NATIVE_DEGREE
143 return SGGeoc(lon*SGD_RADIANS_TO_DEGREES, lat*SGD_RADIANS_TO_DEGREES,
146 return SGGeoc(lon, lat, radius);
152 SGGeoc::fromDegM(double lon, double lat, double radius)
154 #ifdef SG_GEOC_NATIVE_DEGREE
155 return SGGeoc(lon, lat, radius);
157 return SGGeoc(lon*SGD_DEGREES_TO_RADIANS, lat*SGD_DEGREES_TO_RADIANS,
164 SGGeoc::fromCart(const SGVec3<double>& cart)
167 SGGeodesy::SGCartToGeoc(cart, geoc);
173 SGGeoc::fromGeod(const SGGeod& geod)
176 SGGeodesy::SGGeodToCart(geod, cart);
178 SGGeodesy::SGCartToGeoc(cart, geoc);
184 SGGeoc::getLongitudeRad(void) const
186 #ifdef SG_GEOC_NATIVE_DEGREE
187 return _lon*SGD_DEGREES_TO_RADIANS;
195 SGGeoc::setLongitudeRad(double lon)
197 #ifdef SG_GEOC_NATIVE_DEGREE
198 _lon = lon*SGD_RADIANS_TO_DEGREES;
206 SGGeoc::getLongitudeDeg(void) const
208 #ifdef SG_GEOC_NATIVE_DEGREE
211 return _lon*SGD_RADIANS_TO_DEGREES;
217 SGGeoc::setLongitudeDeg(double lon)
219 #ifdef SG_GEOC_NATIVE_DEGREE
222 _lon = lon*SGD_DEGREES_TO_RADIANS;
228 SGGeoc::getLatitudeRad(void) const
230 #ifdef SG_GEOC_NATIVE_DEGREE
231 return _lat*SGD_DEGREES_TO_RADIANS;
239 SGGeoc::setLatitudeRad(double lat)
241 #ifdef SG_GEOC_NATIVE_DEGREE
242 _lat = lat*SGD_RADIANS_TO_DEGREES;
250 SGGeoc::getLatitudeDeg(void) const
252 #ifdef SG_GEOC_NATIVE_DEGREE
255 return _lat*SGD_RADIANS_TO_DEGREES;
261 SGGeoc::setLatitudeDeg(double lat)
263 #ifdef SG_GEOC_NATIVE_DEGREE
266 _lat = lat*SGD_DEGREES_TO_RADIANS;
272 SGGeoc::getRadiusM(void) const
279 SGGeoc::setRadiusM(double radius)
286 SGGeoc::getRadiusFt(void) const
288 return _radius*SG_METER_TO_FEET;
293 SGGeoc::setRadiusFt(double radius)
295 _radius = radius*SG_FEET_TO_METER;
300 SGGeoc::advanceRadM(double course, double distance) const
303 SGGeodesy::advanceRadM(*this, course, distance, result);
309 SGGeoc::courseRad(const SGGeoc& from, const SGGeoc& to)
311 return SGGeodesy::courseRad(from, to);
316 SGGeoc::courseDeg(const SGGeoc& from, const SGGeoc& to)
318 return SGMiscd::rad2deg(courseRad(from, to));
323 SGGeoc::distanceM(const SGGeoc& from, const SGGeoc& to)
325 return SGGeodesy::distanceM(from, to);
330 SGGeoc::operator == ( const SGGeoc & other ) const
332 return _lon == other._lon &&
333 _lat == other._lat &&
334 _radius == other._radius;
337 /// Output to an ostream
338 template<typename char_type, typename traits_type>
340 std::basic_ostream<char_type, traits_type>&
341 operator<<(std::basic_ostream<char_type, traits_type>& s, const SGGeoc& g)
343 return s << "lon = " << g.getLongitudeDeg()
344 << ", lat = " << g.getLatitudeDeg()
345 << ", radius = " << g.getRadiusM();