3 * Routines to deal with polar math and transformations.
6 // Written by Curtis Olson, started June 1997.
8 // Copyright (C) 1997 Curtis L. Olson - http://www.flightgear.org/~curt
10 // This library is free software; you can redistribute it and/or
11 // modify it under the terms of the GNU Library General Public
12 // License as published by the Free Software Foundation; either
13 // version 2 of the License, or (at your option) any later version.
15 // This library is distributed in the hope that it will be useful,
16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 // Library General Public License for more details.
20 // You should have received a copy of the GNU Library General Public
21 // License along with this library; if not, write to the
22 // Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 // Boston, MA 02111-1307, USA.
33 # error This library requires C++
39 #include <simgear/constants.h>
40 #include <simgear/math/point3d.hxx>
44 * Find the Altitude above the Ellipsoid (WGS84) given the Earth
45 * Centered Cartesian coordinate vector Distances are specified in
47 * @param cp point specified in cartesian coordinates
48 * @return altitude above the (wgs84) earth in meters
50 double sgGeodAltFromCart(const Point3D& cp);
54 * Convert a polar coordinate to a cartesian coordinate. Lon and Lat
55 * must be specified in radians. The SG convention is for distances
56 * to be specified in meters
57 * @param p point specified in polar coordinates
58 * @return the same point in cartesian coordinates
60 Point3D sgPolarToCart3d(const Point3D& p);
64 * Convert a cartesian coordinate to polar coordinates (lon/lat
65 * specified in radians. Distances are specified in meters.
66 * @param cp point specified in cartesian coordinates
67 * @return the same point in polar coordinates
69 Point3D sgCartToPolar3d(const Point3D& cp);
73 * Calculate new lon/lat given starting lon/lat, and offset radial, and
74 * distance. NOTE: starting point is specifed in radians, distance is
75 * specified in meters (and converted internally to radians)
76 * ... assumes a spherical world.
77 * @param orig specified in polar coordinates
78 * @param course offset radial
79 * @param dist offset distance
80 * @return destination point in polar coordinates
82 Point3D calc_gc_lon_lat( const Point3D& orig, double course, double dist );
86 * Calculate course/dist given two spherical points.
87 * @param start starting point
88 * @param dest ending point
89 * @param course resulting course
90 * @param dist resulting distance
92 void calc_gc_course_dist( const Point3D& start, const Point3D& dest,
93 double *course, double *dist );
97 * Calculate course/dist given two spherical points.
98 * @param start starting point
99 * @param dest ending point
100 * @param course resulting course
101 * @param dist resulting distance
103 void calc_gc_course_dist( const Point3D& start, const Point3D& dest,
104 double *course, double *dist );
107 #endif // _POLAR3D_HXX