LocalCartesian.cpp
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00010 #include "GeographicLib/LocalCartesian.hpp"
00011
00012 #define GEOGRAPHICLIB_LOCALCARTESIAN_CPP "$Id: LocalCartesian.cpp 6785 2010-01-05 22:15:42Z karney $"
00013
00014 RCSID_DECL(GEOGRAPHICLIB_LOCALCARTESIAN_CPP)
00015 RCSID_DECL(GEOGRAPHICLIB_LOCALCARTESIAN_HPP)
00016
00017 namespace GeographicLib {
00018
00019 using namespace std;
00020
00021 void LocalCartesian::Reset(real lat0, real lon0, real h0) throw() {
00022 _lat0 = lat0;
00023 _lon0 = lon0 >= 180 ? lon0 - 360 : lon0 < -180 ? lon0 + 360 : lon0;
00024 _h0 = h0;
00025 _earth.Forward(_lat0, _lon0, _h0, _x0, _y0, _z0);
00026 real
00027 phi = lat0 * Constants::degree(),
00028 sphi = sin(phi),
00029 cphi = abs(_lat0) == 90 ? 0 : cos(phi),
00030 lam = lon0 * Constants::degree(),
00031 slam = _lon0 == -180 ? 0 : sin(lam),
00032 clam = abs(_lon0) == 90 ? 0 : cos(lam);
00033
00034 _rxx = -slam; _rxy = clam; _rxz = 0;
00035
00036 _ryx = -clam * sphi; _ryy = -slam * sphi; _ryz = cphi;
00037
00038 _rzx = clam * cphi; _rzy = slam * cphi; _rzz = sphi;
00039 }
00040
00041 void LocalCartesian::Forward(real lat, real lon, real h,
00042 real& x, real& y, real& z) const throw() {
00043 real xc, yc, zc;
00044 _earth.Forward(lat, lon, h, xc, yc, zc);
00045 xc -= _x0; yc -= _y0; zc -= _z0;
00046 x = _rxx * xc + _rxy * yc + _rxz * zc;
00047 y = _ryx * xc + _ryy * yc + _ryz * zc;
00048 z = _rzx * xc + _rzy * yc + _rzz * zc;
00049 }
00050
00051 void LocalCartesian::Reverse(real x, real y, real z,
00052 real& lat, real& lon, real& h) const throw() {
00053 real
00054 xc = _x0 + _rxx * x + _ryx * y + _rzx * z,
00055 yc = _y0 + _rxy * x + _ryy * y + _rzy * z,
00056 zc = _z0 + _rxz * x + _ryz * y + _rzz * z;
00057 _earth.Reverse(xc, yc, zc, lat, lon, h);
00058 }
00059
00060 }