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