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feat: qp.quantity_from(PO) added

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This commit is contained in:
Mateusz Pusz
2023-09-13 11:57:22 +02:00
parent 75fc3a0384
commit e085beef40
5 changed files with 36 additions and 18 deletions
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4
example/currency.cpp
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@ -91,6 +91,6 @@ int main()
quantity_point price_usd = zero + 100 * us_dollar;
quantity_point price_euro = exchange_to<euro>(price_usd);
std::cout << price_usd.quantity_ref_from(zero) << " -> " << price_euro.quantity_ref_from(zero) << "\n";
// std::cout << price_usd.quantity_ref_from(zero) + price_euro.quantity_ref_from(zero) << "\n"; // does not compile
std::cout << price_usd.quantity_from(zero) << " -> " << price_euro.quantity_from(zero) << "\n";
// std::cout << price_usd.quantity_from(zero) + price_euro.quantity_from(zero) << "\n"; // does not compile
}

24
example/include/geographic.h
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@ -138,7 +138,7 @@ struct MP_UNITS_STD_FMT::formatter<geographic::latitude<T>> :
auto format(geographic::latitude<T> lat, FormatContext& ctx)
{
formatter<typename geographic::latitude<T>::quantity_type>::format(
is_gt_zero(lat) ? lat.quantity_ref_from(geographic::equator) : -lat.quantity_ref_from(geographic::equator), ctx);
is_gt_zero(lat) ? lat.quantity_from(geographic::equator) : -lat.quantity_from(geographic::equator), ctx);
MP_UNITS_STD_FMT::format_to(ctx.out(), "{}", is_gt_zero(lat) ? " N" : "S");
return ctx.out();
}
@ -151,8 +151,7 @@ struct MP_UNITS_STD_FMT::formatter<geographic::longitude<T>> :
auto format(geographic::longitude<T> lon, FormatContext& ctx)
{
formatter<typename geographic::longitude<T>::quantity_type>::format(
is_gt_zero(lon) ? lon.quantity_ref_from(geographic::prime_meridian)
: -lon.quantity_ref_from(geographic::prime_meridian),
is_gt_zero(lon) ? lon.quantity_from(geographic::prime_meridian) : -lon.quantity_from(geographic::prime_meridian),
ctx);
MP_UNITS_STD_FMT::format_to(ctx.out(), "{}", is_gt_zero(lon) ? " E" : " W");
return ctx.out();
@ -173,28 +172,29 @@ template<typename T>
distance spherical_distance(position<T> from, position<T> to)
{
using namespace mp_units;
constexpr auto earth_radius = 6'371 * isq::radius[si::kilo<si::metre>];
constexpr quantity earth_radius = 6'371 * isq::radius[si::kilo<si::metre>];
using isq::sin, isq::cos, isq::asin, isq::acos;
const auto& from_lat = from.lat.quantity_ref_from(equator);
const auto& from_lon = from.lon.quantity_ref_from(prime_meridian);
const auto& to_lat = to.lat.quantity_ref_from(equator);
const auto& to_lon = to.lon.quantity_ref_from(prime_meridian);
const quantity from_lat = from.lat.quantity_from(equator);
const quantity from_lon = from.lon.quantity_from(prime_meridian);
const quantity to_lat = to.lat.quantity_from(equator);
const quantity to_lon = to.lon.quantity_from(prime_meridian);
// https://en.wikipedia.org/wiki/Great-circle_distance#Formulae
if constexpr (sizeof(T) >= 8) {
// spherical law of cosines
const auto central_angle = acos(sin(from_lat) * sin(to_lat) + cos(from_lat) * cos(to_lat) * cos(to_lon - from_lon));
const quantity central_angle =
acos(sin(from_lat) * sin(to_lat) + cos(from_lat) * cos(to_lat) * cos(to_lon - from_lon));
// const auto central_angle = 2 * asin(sqrt(0.5 - cos(to_lat - from_lat) / 2 + cos(from_lat) * cos(to_lat) * (1
// - cos(lon2_rad - from_lon)) / 2));
return quantity_cast<isq::distance>(earth_radius * central_angle);
} else {
// the haversine formula
const auto sin_lat = sin((to_lat - from_lat) / 2);
const auto sin_lon = sin((to_lon - from_lon) / 2);
const auto central_angle = 2 * asin(sqrt(sin_lat * sin_lat + cos(from_lat) * cos(to_lat) * sin_lon * sin_lon));
const quantity sin_lat = sin((to_lat - from_lat) / 2);
const quantity sin_lon = sin((to_lon - from_lon) / 2);
const quantity central_angle = 2 * asin(sqrt(sin_lat * sin_lat + cos(from_lat) * cos(to_lat) * sin_lon * sin_lon));
return quantity_cast<isq::distance>(earth_radius * central_angle);
}

8
example/unmanned_aerial_vehicle.cpp
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@ -97,8 +97,8 @@ template<earth_gravity_model M>
hae_altitude<M> to_hae(msl_altitude msl, position<long double> pos)
{
const auto geoid_undulation =
isq::height(GeographicLibWhatsMyOffset(pos.lat.quantity_ref_from(equator).numerical_value_in(si::degree),
pos.lon.quantity_ref_from(prime_meridian).numerical_value_in(si::degree)) *
isq::height(GeographicLibWhatsMyOffset(pos.lat.quantity_from(equator).numerical_value_in(si::degree),
pos.lon.quantity_from(prime_meridian).numerical_value_in(si::degree)) *
si::metre);
return height_above_ellipsoid<M> + (msl - mean_sea_level - geoid_undulation);
}
@ -115,7 +115,7 @@ using hal_altitude = quantity_point<isq::altitude[si::metre], height_above_launc
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os, const hal_altitude& a)
{
return os << a.quantity_ref_from(height_above_launch) << " HAL";
return os << a.quantity_from(height_above_launch) << " HAL";
}
template<>
@ -123,7 +123,7 @@ struct MP_UNITS_STD_FMT::formatter<hal_altitude> : formatter<hal_altitude::quant
template<typename FormatContext>
auto format(const hal_altitude& a, FormatContext& ctx)
{
formatter<hal_altitude::quantity_type>::format(a.quantity_ref_from(height_above_launch), ctx);
formatter<hal_altitude::quantity_type>::format(a.quantity_from(height_above_launch), ctx);
return MP_UNITS_STD_FMT::format_to(ctx.out(), " HAL");
}
};

7
src/core/include/mp-units/quantity_point.h
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@ -174,6 +174,13 @@ public:
}
#endif
template<PointOrigin PO2>
requires requires { quantity_point{} - PO2{}; }
[[nodiscard]] constexpr Quantity auto quantity_from(PO2) const
{
return *this - PO2{};
}
template<Unit U>
requires detail::QuantityConvertibleTo<quantity_type, quantity<::mp_units::reference<quantity_spec, U{}>{}, Rep>>
[[nodiscard]] constexpr quantity_point<::mp_units::reference<quantity_spec, U{}>{}, PO, Rep> in(U) const

11
test/unit_test/static/quantity_point_test.cpp
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@ -1105,6 +1105,17 @@ static_assert((ground_level + 42 * m) - other_ground_level == -39 * m);
static_assert((other_ground_level + 42 * m) - tower_peak == 81 * m);
static_assert((tower_peak + 42 * m) - other_ground_level == 3 * m);
static_assert((mean_sea_level + 42 * m).quantity_from(ground_level) == 0 * m);
static_assert((ground_level + 42 * m).quantity_from(mean_sea_level) == 84 * m);
static_assert((tower_peak + 42 * m).quantity_from(ground_level) == 84 * m);
static_assert((ground_level + 42 * m).quantity_from(tower_peak) == 0 * m);
static_assert((tower_peak + 42 * m).quantity_from(mean_sea_level) == 126 * m);
static_assert((mean_sea_level + 42 * m).quantity_from(tower_peak) == -42 * m);
static_assert((other_ground_level + 42 * m).quantity_from(ground_level) == 123 * m);
static_assert((ground_level + 42 * m).quantity_from(other_ground_level) == -39 * m);
static_assert((other_ground_level + 42 * m).quantity_from(tower_peak) == 81 * m);
static_assert((tower_peak + 42 * m).quantity_from(other_ground_level) == 3 * m);
static_assert(mean_sea_level - (ground_level + 42 * m) == -84 * m);
static_assert(ground_level - (mean_sea_level + 42 * m) == 0 * m);
static_assert(tower_peak - (ground_level + 42 * m) == 0 * m);