💿🐜 Antkeeper source code
https://antkeeper.com
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99 lines
2.9 KiB
99 lines
2.9 KiB
/*
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* Copyright (C) 2023 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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#include "game/system/orbit.hpp"
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#include "physics/orbit/orbit.hpp"
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namespace game {
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namespace system {
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orbit::orbit(entity::registry& registry):
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updatable(registry),
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ephemeris(nullptr),
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time(0.0),
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time_scale(1.0)
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{
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registry.on_construct<game::component::orbit>().connect<&orbit::on_orbit_construct>(this);
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registry.on_update<game::component::orbit>().connect<&orbit::on_orbit_update>(this);
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}
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orbit::~orbit()
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{
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registry.on_construct<game::component::orbit>().disconnect<&orbit::on_orbit_construct>(this);
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registry.on_update<game::component::orbit>().disconnect<&orbit::on_orbit_update>(this);
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}
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void orbit::update(double t, double dt)
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{
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// Add scaled timestep to current time
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set_time(time + dt * time_scale);
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if (!ephemeris)
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return;
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// Calculate positions of ephemeris items, in meters
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for (int i: ephemeris_indices)
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positions[i] = (*ephemeris)[i].position(time) * 1000.0;
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// Propagate orbits
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registry.view<component::orbit>().each(
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[&](entity::id entity_eid, auto& orbit)
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{
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orbit.position = positions[orbit.ephemeris_index] * orbit.scale;
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entity::id parent_id = orbit.parent;
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while (parent_id != entt::null)
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{
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const component::orbit& parent_orbit = registry.get<component::orbit>(parent_id);
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orbit.position += positions[parent_orbit.ephemeris_index] * parent_orbit.scale;
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parent_id = parent_orbit.parent;
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}
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});
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}
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void orbit::set_ephemeris(const physics::orbit::ephemeris<double>* ephemeris)
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{
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this->ephemeris = ephemeris;
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positions.resize((ephemeris) ? ephemeris->size() : 0);
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}
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void orbit::set_time(double time)
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{
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this->time = time;
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}
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void orbit::set_time_scale(double scale)
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{
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time_scale = scale;
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}
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void orbit::on_orbit_construct(entity::registry& registry, entity::id entity_id)
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{
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const game::component::orbit& component = registry.get<game::component::orbit>(entity_id);
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ephemeris_indices.insert(component.ephemeris_index);
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}
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void orbit::on_orbit_update(entity::registry& registry, entity::id entity_id)
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{
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const game::component::orbit& component = registry.get<game::component::orbit>(entity_id);
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ephemeris_indices.insert(component.ephemeris_index);
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}
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} // namespace system
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} // namespace game
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