WRAPPER_API bool RhumbDirect(const GeodeticPoint &fromPoint, double azimuth, double geodesic, GeodeticPoint &toPoint) const
The RhumbDirect method takes a GeodeticPoint, a geodesic distance, and an azimuth angle as input and produces a GeodeticPoint as output. The input values occupy the first three arguments of the method and the output point fills the fourth argument. The method computes a Rhumb Line that passes through the input point at the specified azimuth. It then finds the point that lies on the Rhumb Line the specified distance from the input point in the direction of the specified azimuth. This point is stored in the GeodeticPoint that occupies the fourth argument to the method. The method returns a boolean value indicating the success of the operation.
The azimuth value is assumed to be given in radians, and the geodesic distance is assumed to be given in meters.
If a three-dimensional GeodeticPoint is used, this method will ignore the Height coordinate on the input point. The Height of the point will be assumed to be 0, so that the calculations occur on the surface of the Ellipsoid. The Height of the output point will be equal to the Height of the input point.
void Ellipsoid_RhumbDirect(GEOCALCPBW_NAMESPACE::DataSource & data)
{
GEOCALCPBW_NAMESPACE::Ellipsoid ell;
GEOCALCPBW_NAMESPACE::LinearValue semiMaj;
semiMaj.set_InMeters(6378137);
ell.set_SemiMajor(semiMaj);
ell.set_InvFlatDefinitive(true);
ell.set_InverseFlattening(298.257223563);
GEOCALCPBW_NAMESPACE::GeodeticPoint * fromPt = data.GetGeodeticPoint(L"BMG", L"GEODETIC_POINT_DEGREES");
GEOCALCPBW_NAMESPACE::GeodeticPoint * toPt = data.GetGeodeticPoint(L"BMG", L"GEODETIC_POINT_DEGREES");
fromPt->set_InUnits(-77.36, 45.45);
double azimuth = 1.004;
double geodesic = 1336;
if(! ell.RhumbDirect(*fromPt, geodesic, azimuth, *toPt))
{
AfxMessageBox("RhumbDirect failed");
}
delete fromPt;
delete toPt;
}