💿🐜 Antkeeper source code
https://antkeeper.com
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86 lines
2.4 KiB
86 lines
2.4 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_GAME_SYSTEM_SOLAR_HPP
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#define ANTKEEPER_GAME_SYSTEM_SOLAR_HPP
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#include "game/system/updatable.hpp"
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#include "utility/fundamental-types.hpp"
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#include "entity/id.hpp"
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#include "game/component/orbit.hpp"
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#include "physics/orbit/ephemeris.hpp"
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#include <unordered_set>
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namespace game {
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namespace system {
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/**
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* Updates the Cartesian position and velocity of orbiting bodies given their Keplerian orbital elements and the current time.
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*/
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class orbit:
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public updatable
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{
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public:
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orbit(entity::registry& registry);
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~orbit();
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/**
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* Scales then adds the timestep `dt` to the current time, then recalculates the positions of orbiting 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 time.
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*
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* @param time Time, in days.
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*/
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void set_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 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 ephemeris used to calculate orbital positions.
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*
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* @param ephemeris Ephemeris.
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*/
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void set_ephemeris(const physics::orbit::ephemeris<double>* ephemeris);
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private:
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void on_orbit_construct(entity::registry& registry, entity::id entity_id);
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void on_orbit_update(entity::registry& registry, entity::id entity_id);
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const physics::orbit::ephemeris<double>* ephemeris;
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double time;
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double time_scale;
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std::vector<double3> positions;
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std::unordered_set<int> ephemeris_indices;
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};
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} // namespace system
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} // namespace game
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#endif // ANTKEEPER_GAME_SYSTEM_SOLAR_HPP
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