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- /*
- * Copyright (C) 2021 Christopher J. Howard
- *
- * This file is part of Antkeeper source code.
- *
- * Antkeeper source code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Antkeeper source code is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #ifndef ANTKEEPER_ENTITY_SYSTEM_ASTRONOMY_HPP
- #define ANTKEEPER_ENTITY_SYSTEM_ASTRONOMY_HPP
-
- #include "entity/systems/updatable.hpp"
- #include "entity/id.hpp"
- #include "scene/directional-light.hpp"
- #include "utility/fundamental-types.hpp"
- #include "physics/frame.hpp"
- #include "render/passes/sky-pass.hpp"
- #include "entity/components/atmosphere.hpp"
- #include "entity/components/celestial-body.hpp"
- #include "entity/components/orbit.hpp"
-
- namespace entity {
- namespace system {
-
- /**
- * Calculates apparent properties of celestial bodies relative to an observer.
- */
- class astronomy:
- public updatable
- {
- public:
- astronomy(entity::registry& registry);
-
- /**
- * Scales then adds the timestep `dt` to the current time, then recalculates the positions of celestial bodies.
- *
- * @param t Time, in seconds.
- * @param dt Delta time, in seconds.
- */
- virtual void update(double t, double dt);
-
- /**
- * Sets the current universal time.
- *
- * @param time Universal time, in days.
- */
- void set_universal_time(double time);
-
- /**
- * Sets the factor by which the timestep `dt` will be scaled before being added to the current universal time.
- *
- * @param scale Factor by which to scale the timestep.
- */
- void set_time_scale(double scale);
-
- /**
- * Sets the reference body entity, from which observations are taking place.
- *
- * @param entity Entity of the reference body.
- */
- void set_reference_body(entity::id entity_id);
-
- /**
- * Sets the location of the observer using spherical coordinates in BCBF space.
- *
- * @param location Spherical coordinates of the observer, in reference body BCBF space, in the ISO order of altitude (meters), latitude (radians), and longitude (radians).
- */
- void set_observer_location(const double3& location);
-
- void set_sun_light(scene::directional_light* light);
-
- void set_sky_pass(::render::sky_pass* pass);
-
- private:
- void on_celestial_body_construct(entity::registry& registry, entity::id entity_id, entity::component::celestial_body& celestial_body);
- void on_celestial_body_replace(entity::registry& registry, entity::id entity_id, entity::component::celestial_body& celestial_body);
-
- void update_bcbf_to_topocentric();
-
- double universal_time;
- double time_scale;
-
- entity::id reference_entity;
-
- double3 observer_location;
-
- physics::frame<double> inertial_to_bcbf;
- physics::frame<double> bcbf_to_topocentric;
- physics::frame<double> inertial_to_topocentric;
- physics::frame<double> sez_to_ezs;
- physics::frame<double> ezs_to_sez;
-
- scene::directional_light* sun_light;
- ::render::sky_pass* sky_pass;
- };
-
- } // namespace system
- } // namespace entity
-
- #endif // ANTKEEPER_ENTITY_SYSTEM_ASTRONOMY_HPP
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