orbit-system.hpp

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/*
 * Copyright (C) 2023  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_GAME_ORBIT_SYSTEM_HPP
#define ANTKEEPER_GAME_ORBIT_SYSTEM_HPP
 
#include "game/systems/updatable-system.hpp"
#include <engine/math/vector.hpp>
#include <engine/entity/id.hpp>
#include "game/components/orbit-component.hpp"
#include <engine/physics/orbit/ephemeris.hpp>
#include <unordered_set>
 
class orbit_system:
    public updatable_system
{
public:
    explicit orbit_system(entity::registry& registry);
    ~orbit_system();
    
    virtual void update(float t, float dt);
    
    void set_time(double time);
    
    void set_time_scale(double scale);
    
    void set_ephemeris(std::shared_ptr<physics::orbit::ephemeris<double>> ephemeris);
    
private:
    void on_orbit_construct(entity::registry& registry, entity::id entity_id);
    void on_orbit_update(entity::registry& registry, entity::id entity_id);
    
    std::shared_ptr<physics::orbit::ephemeris<double>> ephemeris;
    double time;
    double time_scale;
    std::vector<math::dvec3> positions;
    std::unordered_set<int> ephemeris_indices;
};
 
#endif // ANTKEEPER_GAME_ORBIT_SYSTEM_HPP