std::unique_ptr<MassiveBody> SolarSystem<Frame>::MakeMassiveBody(
serialization::GravityModel::Body const& body) {
CHECK(body.has_gravitational_parameter());
CHECK_EQ(body.has_j2(), body.has_reference_radius());
CHECK_EQ(body.has_axis_declination(), body.has_axis_right_ascension());
MassiveBody::Parameters massive_body_parameters(
ParseQuantity<GravitationalParameter>(
body.gravitational_parameter()));
if (body.has_axis_declination()) {
// TODO(phl): Parse the additional parameters.
typename RotatingBody<Frame>::Parameters
rotating_body_parameters(
0 * Radian,
Instant(),
Bivector<double, Frame>(
RadiusLatitudeLongitude(
1.0,
ParseQuantity<Angle>(body.axis_declination()),
ParseQuantity<Angle>(body.axis_right_ascension())).
ToCartesian()) * Radian / Second);
if (body.has_j2()) {
typename OblateBody<Frame>::Parameters oblate_body_parameters(
ParseQuantity<double>(body.j2()),
ParseQuantity<Length>(body.reference_radius()));
return std::make_unique<OblateBody<Frame>>(massive_body_parameters,
rotating_body_parameters,
oblate_body_parameters);
} else {
return std::make_unique<RotatingBody<Frame>>(massive_body_parameters,
rotating_body_parameters);
}
} else {
return std::make_unique<MassiveBody>(massive_body_parameters);
}
}
RotatingBody<Frame>::RotatingBody(
MassiveBody::Parameters const& massive_body_parameters,
Parameters const& parameters)
: MassiveBody(massive_body_parameters),
parameters_(parameters),
polar_axis_(RadiusLatitudeLongitude(
1.0,
parameters.declination_of_pole_,
parameters.right_ascension_of_pole_).ToCartesian()),
angular_velocity_(polar_axis_.coordinates() *
parameters.angular_frequency_) {}