Code de départ
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572dfb6788
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4 changed files with 34 additions and 360 deletions
36
README.md
36
README.md
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@ -1,17 +1,19 @@
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## Feuille de route
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* Créer deuxième planète
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* Gravité naïve
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* Vitesse
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* Poids
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* Faire un système solaire (trouver valeurs)
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* Quadtree
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* Réutiliser les mêmes Mesh et Material (augmente FPS en dézoom)
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* Générer un mesh avec noise
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* Générer plusieurs meshes
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* (?) Collision
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* Détection
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* Double boucle naïve
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* Intégré au quadtree
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* Fusion simple
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* Fragmentation
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* Cratère
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# Stage JSB : Simulation spatiale
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## Aide
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[Documentation de Bevy](https://docs.rs/bevy/latest/bevy/)
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## Commandes
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Vérifier la validité du code :
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cargo check
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Compiler et lancer le programme :
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cargo run
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Compiler et lancer le programme optimisé (plus lent à compiler, mais plus léger et rapide à exécuter) :
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cargo run --release
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22
src/gen.rs
22
src/gen.rs
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@ -2,28 +2,14 @@ use bevy::{prelude::*, render::render_resource::PrimitiveTopology};
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use opensimplex_noise_rs::OpenSimplexNoise;
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use rand::Rng;
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pub fn planet() -> Mesh {
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pub fn _planet() -> Mesh {
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let mut rng = rand::thread_rng();
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let simplex = OpenSimplexNoise::new(Some(rng.gen()));
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let _simplex = OpenSimplexNoise::new(Some(rng.gen()));
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let mut mesh = Mesh::new(PrimitiveTopology::TriangleList);
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let perimeter: u32 = 1000;
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mesh.insert_attribute(
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Mesh::ATTRIBUTE_POSITION,
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(0..perimeter)
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.map(|i| {
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let mut r = simplex.eval_2d(i as f64 * 0.02, 0.) as f32 * 20.0 + 100.0;
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r += simplex.eval_2d(i as f64 * 0.05, 10.) as f32 * 10.0;
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r += simplex.eval_2d(i as f64 * 0.2, 10.) as f32 * 4.0;
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let a = std::f32::consts::TAU * i as f32 / perimeter as f32;
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[r * a.cos(), r * a.sin(), 0.]
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})
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.chain([[0., 0., 0.]])
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.collect::<Vec<_>>(),
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vec![[0.0, 0.0, 0.0], [1.0, 0.0, 0.0], [0.0, 1.0, 0.0]],
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);
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let mut triangles = Vec::new();
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for i in 0..perimeter {
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triangles.extend_from_slice(&[i, perimeter, (i + 1) % perimeter]);
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}
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mesh.set_indices(Some(bevy::render::mesh::Indices::U32(triangles)));
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mesh.set_indices(Some(bevy::render::mesh::Indices::U32(vec![0, 1, 2])));
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mesh
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}
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176
src/main.rs
176
src/main.rs
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@ -1,18 +1,11 @@
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mod gen;
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mod quadtree;
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use bevy::{
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ecs::query::BatchingStrategy,
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prelude::*,
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sprite::{MaterialMesh2dBundle, Mesh2dHandle},
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};
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use bevy::{prelude::*, sprite::MaterialMesh2dBundle};
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#[global_allocator]
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static ALLOCATOR: cap::Cap<std::alloc::System> =
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cap::Cap::new(std::alloc::System, 1024 * 1024 * 1024);
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static UNIVERSE_POS: (Vec2, Vec2) = (Vec2::new(-1e6, -1e6), Vec2::new(1e6, 1e6));
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fn main() {
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App::new()
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.add_plugins((
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@ -20,16 +13,9 @@ fn main() {
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bevy_fps_counter::FpsCounterPlugin,
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bevy_pancam::PanCamPlugin,
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))
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.insert_resource(Constants { g: 6.674e-11 })
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.add_systems(Startup, setup)
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.configure_sets(Update, (Set::Force, Set::Apply).chain())
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.add_systems(
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Update,
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(
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weight_system.in_set(Set::Force),
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apply_system.in_set(Set::Apply),
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),
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)
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.configure_sets(Update, (Set::Demo).chain())
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.add_systems(Update, (demo_system.in_set(Set::Demo),))
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.run();
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}
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@ -42,174 +28,34 @@ fn setup(
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.spawn(Camera2dBundle::default())
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.insert(bevy_pancam::PanCam::default());
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let red = materials.add(ColorMaterial::from(Color::RED));
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let circle_5: Mesh2dHandle = meshes.add(shape::Circle::new(5.).into()).into();
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commands
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.spawn(Planet {
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.spawn(Ball {
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pos: TransformBundle::from(Transform::from_translation(Vec3::new(0., 0., 0.))),
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mass: Mass(1.988e18),
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speed: Speed(Vec2::new(0.0, 0.0)),
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visibility: InheritedVisibility::VISIBLE,
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})
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.with_children(|parent| {
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parent.spawn(MaterialMesh2dBundle {
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mesh: meshes.add(gen::planet()).into(),
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material: materials.add(ColorMaterial::from(Color::YELLOW)),
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..default()
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});
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});
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commands
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.spawn(Planet {
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pos: TransformBundle::from(Transform::from_translation(Vec3::new(400., 0., 0.))),
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mass: Mass(5.9736e14),
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speed: Speed(Vec2::new(0.0, 500.0)),
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visibility: InheritedVisibility::VISIBLE,
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})
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.with_children(|parent| {
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parent.spawn(MaterialMesh2dBundle {
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mesh: meshes.add(shape::Circle::new(10.).into()).into(),
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material: materials.add(ColorMaterial::from(Color::BLUE)),
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material: materials.add(ColorMaterial::from(Color::ORANGE)),
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..default()
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});
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});
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commands
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.spawn(Planet {
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pos: TransformBundle::from(Transform::from_translation(Vec3::new(-400., 0., 0.))),
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mass: Mass(5.9736e14),
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speed: Speed(Vec2::new(0.0, -500.0)),
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visibility: InheritedVisibility::VISIBLE,
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})
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.with_children(|parent| {
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parent.spawn(MaterialMesh2dBundle {
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mesh: meshes.add(shape::Circle::new(10.).into()).into(),
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material: materials.add(ColorMaterial::from(Color::BLUE)),
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..default()
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});
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});
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for i in 0..4000u32 {
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commands
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.spawn(Planet {
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pos: TransformBundle::from(Transform::from_translation(Vec3::new(
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-450. - i as f32 / 4.,
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0.,
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0.,
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))),
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mass: Mass(1.),
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speed: Speed(Vec2::new(0.0, -500.0)),
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visibility: InheritedVisibility::VISIBLE,
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})
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.with_children(|parent| {
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parent.spawn(MaterialMesh2dBundle {
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mesh: circle_5.clone(),
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material: red.clone(),
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..default()
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});
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});
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}
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}
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#[derive(Clone, Debug, Eq, Hash, PartialEq, SystemSet)]
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enum Set {
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Force,
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Apply,
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Demo,
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}
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#[derive(Component)]
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struct Speed(Vec2);
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#[derive(Component)]
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struct Mass(f32);
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#[derive(Bundle)]
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struct Planet {
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struct Ball {
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pos: TransformBundle,
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mass: Mass,
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speed: Speed,
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visibility: InheritedVisibility,
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}
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#[derive(Resource)]
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struct Constants {
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g: f32,
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}
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struct Body {
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mass: f32,
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pos: Vec2,
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}
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impl quadtree::Body for Body {
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fn mass(&self) -> f32 {
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self.mass
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}
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fn pos(&self) -> Vec2 {
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self.pos
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}
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fn add_mass(&mut self, mass: f32) {
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self.mass += mass;
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fn demo_system(query: Query<&Transform>, time: Res<Time>) {
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println!("Temps écoulé : {}s", time.delta_seconds());
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for pos in query.iter() {
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println!("Il y a un objet aux coordonnées {:?}", pos.translation);
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}
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}
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/*fn weight_system(
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constants: Res<Constants>,
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query1: Query<(&Transform, &Mass)>,
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mut query2: Query<(&Transform, &mut Speed)>,
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time: Res<Time>,
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) {
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let gdt = constants.g * time.delta_seconds();
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for (n1_pos, n1_mass) in query1.iter() {
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for (n2_pos, mut n2_speed) in query2.iter_mut() {
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let d2 = (n1_pos.translation.x - n2_pos.translation.x).powi(2)
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+ (n1_pos.translation.y - n2_pos.translation.y).powi(2);
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if d2 == 0.0 {
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continue;
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}
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let f = n1_mass.0 * gdt / (d2 * d2.sqrt());
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n2_speed.x += (n1_pos.translation.x - n2_pos.translation.x) * f;
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n2_speed.y += (n1_pos.translation.y - n2_pos.translation.y) * f;
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}
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}
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}*/
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fn weight_system(
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constants: Res<Constants>,
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mut query: Query<(&Transform, &Mass, &mut Speed)>,
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time: Res<Time>,
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) {
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let mut tree = quadtree::Node::new(UNIVERSE_POS);
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let gdt = constants.g * time.delta_seconds();
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for (pos, mass, _speed) in query.iter() {
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tree.add_body(Body {
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mass: mass.0,
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pos: pos.translation.xy(),
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});
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}
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query.par_iter_mut().for_each(|(pos, _mass, mut speed)| {
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speed.0 += gdt * tree.apply(pos.translation.xy(), 0.5);
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});
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// let gdt = constants.g * time.delta_seconds();
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// let mut iter = query.iter_combinations_mut();
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// while let Some([(n1_pos, n1_mass, mut n1_speed), (n2_pos, n2_mass, mut n2_speed)]) =
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// iter.fetch_next()
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// {
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// let d2 = (n1_pos.translation.x - n2_pos.translation.x).powi(2)
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// + (n1_pos.translation.y - n2_pos.translation.y).powi(2);
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// let f = gdt / (d2 * d2.sqrt());
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// n1_speed.x -= (n1_pos.translation.x - n2_pos.translation.x) * f * n2_mass.0;
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// n1_speed.y -= (n1_pos.translation.y - n2_pos.translation.y) * f * n2_mass.0;
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// n2_speed.x += (n1_pos.translation.x - n2_pos.translation.x) * f * n1_mass.0;
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// n2_speed.y += (n1_pos.translation.y - n2_pos.translation.y) * f * n1_mass.0;
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// }
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}
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fn apply_system(mut query: Query<(&mut Transform, &Speed)>, time: Res<Time>) {
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let dt = time.delta_seconds();
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query
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.par_iter_mut()
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.batching_strategy(BatchingStrategy::fixed(128))
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.for_each(|(mut pos, speed)| {
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pos.translation.x += speed.0.x * dt;
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pos.translation.y += speed.0.y * dt;
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});
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}
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160
src/quadtree.rs
160
src/quadtree.rs
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@ -1,160 +0,0 @@
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use bevy::prelude::*;
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pub trait Body {
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fn mass(&self) -> f32;
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fn pos(&self) -> Vec2;
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fn add_mass(&mut self, mass: f32);
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}
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pub enum Node<L> {
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Branch {
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nodes: Box<[Node<L>; 4]>,
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center: Vec2,
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mass: f32,
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center_of_mass: Vec2,
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width: f32,
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},
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Leaf {
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body: Option<L>,
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pos: (Vec2, Vec2),
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},
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}
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impl<L: Body> Node<L> {
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pub fn new(pos: (Vec2, Vec2)) -> Self {
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Node::Leaf { body: None, pos }
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// let center = (pos.1 - pos.0) / 2.0;
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// Node::Branch {
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// nodes: [
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// Box::new(Node::Leaf {
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// body: None,
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// pos: (pos.0, center),
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// }),
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// Box::new(Node::Leaf {
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// body: None,
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// pos: (Vec2::new(center.x, pos.0.y), Vec2::new(pos.1.x, center.y)),
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// }),
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// Box::new(Node::Leaf {
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// body: None,
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// pos: (Vec2::new(pos.0.x, center.y), Vec2::new(center.x, pos.1.y)),
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// }),
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// Box::new(Node::Leaf {
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// body: None,
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// pos: (center, pos.1),
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// }),
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// ],
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// center,
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// mass: 0.0,
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// center_of_mass: center,
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// width: pos.1.x - pos.0.x,
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// }
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}
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pub fn add_body(&mut self, new_body: L) {
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match self {
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Node::Branch {
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nodes,
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center,
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mass,
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center_of_mass,
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..
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} => {
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let new_body_pos = new_body.pos();
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let new_body_mass = new_body.mass();
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*center_of_mass = (*center_of_mass * *mass + new_body_mass * new_body_pos)
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/ (*mass + new_body_mass);
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*mass += new_body_mass;
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nodes[if new_body_pos.x < center.x {
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if new_body_pos.y < center.y {
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0
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} else {
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2
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}
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} else {
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if new_body_pos.y < center.y {
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1
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} else {
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3
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}
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}]
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.add_body(new_body)
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}
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Node::Leaf { body, pos } => {
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if let Some(mut body) = body.take() {
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if body.pos().distance_squared(new_body.pos()) < 1.0 {
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body.add_mass(new_body.mass());
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*self = Node::Leaf {
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body: Some(body),
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pos: *pos,
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};
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return;
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}
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let center = (pos.0 + pos.1) / 2.0;
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*self = Node::Branch {
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nodes: Box::new([
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Node::Leaf {
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body: None,
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pos: (pos.0, center),
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},
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Node::Leaf {
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body: None,
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pos: (Vec2::new(center.x, pos.0.y), Vec2::new(pos.1.x, center.y)),
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},
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Node::Leaf {
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body: None,
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pos: (Vec2::new(pos.0.x, center.y), Vec2::new(center.x, pos.1.y)),
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},
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Node::Leaf {
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body: None,
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pos: (center, pos.1),
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},
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]),
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center,
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mass: 0.0,
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center_of_mass: center,
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width: pos.1.x - pos.0.x,
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};
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self.add_body(body);
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self.add_body(new_body)
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} else {
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*body = Some(new_body);
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}
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}
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}
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}
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pub fn apply(&self, on: Vec2, theta: f32) -> Vec2 {
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match self {
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Node::Branch {
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nodes,
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mass,
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center_of_mass,
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width,
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..
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} => {
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if on == *center_of_mass {
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return Vec2::ZERO;
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}
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let dist = on.distance(*center_of_mass);
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if width / dist < theta {
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*mass * (*center_of_mass - on) / (dist * dist * dist)
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} else {
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nodes[0].apply(on, theta)
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+ nodes[1].apply(on, theta)
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+ nodes[2].apply(on, theta)
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+ nodes[3].apply(on, theta)
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}
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}
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Node::Leaf { body, .. } => {
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if let Some(body) = body {
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if on == body.pos() {
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return Vec2::ZERO;
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}
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let dist = on.distance(body.pos());
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body.mass() * (body.pos() - on) / (dist * dist * dist)
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} else {
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Vec2::ZERO
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}
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}
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}
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}
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}
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