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Matthew Deville 2026-09-28 10:07:38 +02:00
parent e6f69c8cd8
commit bcf542f963
4 changed files with 137 additions and 731 deletions
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@ -162,23 +162,10 @@ dependencies = [
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name = "proc-macro-error-attr3"
version = "3.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9e564d14133360e1ae169ffde5da25881b5fa47261665b8e5713c212c27799da"
dependencies = [
"proc-macro2",
"quote",
]
[[package]]
name = "proc-macro-error3"
version = "3.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8f0d4471b3436c22106b21913b1dda531558918ae9b7ec55d58aa84b43552233"
dependencies = [
"proc-macro-error-attr3",
"proc-macro2",
"quote",
"syn 3.0.6",
]
[[package]] [[package]]
name = "proc-macro2" name = "proc-macro2"
version = "1.0.107" version = "1.0.107"
@ -4658,40 +4217,6 @@ dependencies = [
"objc2-quartz-core 0.3.2", "objc2-quartz-core 0.3.2",
] ]
[[package]]
name = "rayon"
version = "1.12.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fb39b166781f92d482534ef4b4b1b2568f42613b53e5b6c160e24cfbfa30926d"
dependencies = [
"either",
"rayon-core",
]
[[package]]
name = "rayon-core"
version = "1.13.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "22e18b0f0062d30d4230b2e85ff77fdfe4326feb054b9783a3460d8435c8ab91"
dependencies = [
"crossbeam-deque",
"crossbeam-utils",
]
[[package]]
name = "rdst"
version = "0.20.14"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6e7970b4e577b76a96d5e56b5f6662b66d1a4e1f5bb026ee118fc31b373c2752"
dependencies = [
"arbitrary-chunks",
"block-pseudorand",
"criterion",
"partition",
"tikv-jemallocator",
"voracious_radix_sort",
]
[[package]] [[package]]
name = "read-fonts" name = "read-fonts"
version = "0.39.2" version = "0.39.2"
@ -4781,12 +4306,6 @@ version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "19b30a45b0cd0bcca8037f3d0dc3421eaf95327a17cad11964fb8179b4fc4832" checksum = "19b30a45b0cd0bcca8037f3d0dc3421eaf95327a17cad11964fb8179b4fc4832"
[[package]]
name = "robust"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4e27ee8bb91ca0adcf0ecb116293afa12d393f9c2b9b9cd54d33e8078fe19839"
[[package]] [[package]]
name = "ron" name = "ron"
version = "0.12.2" version = "0.12.2"
@ -4854,15 +4373,6 @@ version = "1.0.23"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f" checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f"
[[package]]
name = "safe_arch"
version = "0.7.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "96b02de82ddbe1b636e6170c21be622223aea188ef2e139be0a5b219ec215323"
dependencies = [
"bytemuck",
]
[[package]] [[package]]
name = "same-file" name = "same-file"
version = "1.0.6" version = "1.0.6"
@ -5009,19 +4519,6 @@ dependencies = [
"libc", "libc",
] ]
[[package]]
name = "simba"
version = "0.9.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c99284beb21666094ba2b75bbceda012e610f5479dfcc2d6e2426f53197ffd95"
dependencies = [
"approx",
"num-complex",
"num-traits",
"paste",
"wide",
]
[[package]] [[package]]
name = "simd-adler32" name = "simd-adler32"
version = "0.3.10" version = "0.3.10"
@ -5129,18 +4626,6 @@ dependencies = [
"windows-sys 0.61.2", "windows-sys 0.61.2",
] ]
[[package]]
name = "spade"
version = "2.15.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9699399fd9349b00b184f5635b074f9ec93afffef30c853f8c875b32c0f8c7fa"
dependencies = [
"hashbrown 0.16.1",
"num-traits",
"robust",
"smallvec",
]
[[package]] [[package]]
name = "spin" name = "spin"
version = "0.10.1" version = "0.10.1"
@ -5335,26 +4820,6 @@ dependencies = [
"cfg-if", "cfg-if",
] ]
[[package]]
name = "tikv-jemalloc-sys"
version = "0.5.4+5.3.0-patched"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9402443cb8fd499b6f327e40565234ff34dbda27460c5b47db0db77443dd85d1"
dependencies = [
"cc",
"libc",
]
[[package]]
name = "tikv-jemallocator"
version = "0.5.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "965fe0c26be5c56c94e38ba547249074803efd52adfb66de62107d95aab3eaca"
dependencies = [
"libc",
"tikv-jemalloc-sys",
]
[[package]] [[package]]
name = "tiny-skia" name = "tiny-skia"
version = "0.11.4" version = "0.11.4"
@ -5391,16 +4856,6 @@ dependencies = [
"zerovec", "zerovec",
] ]
[[package]]
name = "tinytemplate"
version = "1.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "be4d6b5f19ff7664e8c98d03e2139cb510db9b0a60b55f8e8709b689d939b6bc"
dependencies = [
"serde",
"serde_json",
]
[[package]] [[package]]
name = "tinyvec" name = "tinyvec"
version = "1.13.3" version = "1.13.3"
@ -5722,15 +5177,6 @@ version = "0.9.5"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a" checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
[[package]]
name = "voracious_radix_sort"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "446e7ffcb6c27a71d05af7e51ef2ee5b71c48424b122a832f2439651e1914899"
dependencies = [
"rayon",
]
[[package]] [[package]]
name = "walkdir" name = "walkdir"
version = "2.5.0" version = "2.5.0"
@ -6126,16 +5572,6 @@ dependencies = [
"web-sys", "web-sys",
] ]
[[package]]
name = "wide"
version = "0.7.33"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0ce5da8ecb62bcd8ec8b7ea19f69a51275e91299be594ea5cc6ef7819e16cd03"
dependencies = [
"bytemuck",
"safe_arch",
]
[[package]] [[package]]
name = "winapi" name = "winapi"
version = "0.3.9" version = "0.3.9"

1
app/Cargo.toml
View file

@ -4,5 +4,4 @@
version = "0.1.0" version = "0.1.0"
[dependencies] [dependencies]
avian2d = "0.7"
bevy = { version = "0.19", default-features = false, features = ["2d"] } bevy = { version = "0.19", default-features = false, features = ["2d"] }

259
app/src/main.rs
View file

@ -1,15 +1,11 @@
use avian2d::prelude::*; use bevy::{platform::collections::HashMap, prelude::*};
use bevy::{ use std::f32::consts::PI;
input::common_conditions::input_just_pressed,
prelude::*,
window::{PrimaryWindow, WindowResized},
};
fn main() { fn main() {
App::new() App::new()
.insert_resource(ClearColor(Color::srgb_u8(26, 26, 46))) .insert_resource(ClearColor(Color::srgb_u8(26, 26, 46)))
.add_plugins(( .insert_resource(Time::<Fixed>::from_hz(60.0))
DefaultPlugins.set(WindowPlugin { .add_plugins(DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window { primary_window: Some(Window {
fit_canvas_to_parent: true, fit_canvas_to_parent: true,
prevent_default_event_handling: false, prevent_default_event_handling: false,
@ -17,160 +13,133 @@ fn main() {
..default() ..default()
}), }),
..default() ..default()
}), }))
PhysicsPlugins::default(),
))
.insert_resource(Time::<Physics>::default().with_relative_speed(5.0))
.insert_resource(DefaultRestitution(
Restitution::PERFECTLY_ELASTIC.with_combine_rule(CoefficientCombine::Max),
))
.add_systems(Startup, setup) .add_systems(Startup, setup)
.add_systems( .add_systems(FixedUpdate, update_boids)
Update,
(
update_screen_edges,
spawn_ball.run_if(input_just_pressed(MouseButton::Left)),
),
)
.run(); .run();
} }
#[derive(Component, Clone, Copy)] const BOID_MAX_VELOCITY: f32 = 200.0;
enum ScreenEdge {
Top, #[derive(Component)]
Bottom, struct Boid {
Left, velocity: Vec2,
Right,
} }
fn setup( fn setup(
mut commands: Commands, mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>, mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<ColorMaterial>>, mut materials: ResMut<Assets<ColorMaterial>>,
window: Query<&Window, With<PrimaryWindow>>,
) { ) {
const NUM_BOIDS: usize = 50;
commands.spawn(Camera2d); commands.spawn(Camera2d);
if let Ok(window) = window.single() { // Triangle pointing right
spawn_screen_edges(&mut commands, &mut meshes, &mut materials, window.size()); let triangle_mesh = Mesh2d(meshes.add(Triangle2d::new(
} Vec2::new(10.0, 0.0),
Vec2::new(-3.0, 3.0),
Vec2::new(-3.0, -3.0),
)));
let triangle_material = MeshMaterial2d(materials.add(Color::WHITE));
commands.spawn_batch((0..=NUM_BOIDS).map(move |n| {
let angle = 2.0 * PI / (NUM_BOIDS as f32) * n as f32;
(
Boid {
velocity: Vec2::from_angle(angle) * BOID_MAX_VELOCITY,
},
triangle_mesh.clone(),
triangle_material.clone(),
Transform::default().rotate(Quat::from_rotation_z(angle)),
)
}));
} }
#[derive(Component, Clone, Copy)] struct Model {
struct Ball; separation: Vec2,
alignment: Vec2,
cohesion: Vec2,
}
fn spawn_ball( fn update_boids(
mouse_button: Res<ButtonInput<MouseButton>>, window: Single<&Window, With<bevy::window::PrimaryWindow>>,
window: Single<&Window, With<PrimaryWindow>>, mut query: Query<(Entity, &mut Boid, &mut Transform)>,
camera_query: Single<(&Camera, &GlobalTransform)>, time: Res<Time<Fixed>>,
time: Res<Time>,
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<ColorMaterial>>,
) { ) {
const CIRCLE_RADIUS: f32 = 5.0; let dt = time.delta_secs();
let x_bound = window.width() * 0.7;
let y_bound = window.height() * 0.7;
let (camera, camera_transform) = *camera_query; const PROTECTED_RANGE: f32 = 30.0;
if mouse_button.just_pressed(MouseButton::Left) const VISIBLE_RANGE: f32 = 100.0;
&& let Some(cursor_position) = window.cursor_position()
&& let Ok(world_position) = camera.viewport_to_world_2d(camera_transform, cursor_position) let mut model_updates = HashMap::new();
{ for (entity, boid, transform) in query.iter() {
commands.spawn(( let mut nb_neighbors: usize = 0;
RigidBody::Dynamic, let mut separation = Vec2::new(0.0, 0.0);
Collider::circle(CIRCLE_RADIUS), let mut avg_speed = Vec2::new(0.0, 0.0);
LinearVelocity(Vec2::new(time.elapsed_secs().sin(), time.elapsed_secs().cos()) * 100.0), let mut avg_pos = Vec2::new(0.0, 0.0);
Mesh2d(meshes.add(Circle::new(CIRCLE_RADIUS))), for (other_entity, other_boid, other_transform) in query.iter() {
MeshMaterial2d(materials.add(Color::hsl(time.elapsed_secs().sin() * 360.0, 1.0, 0.5))), if entity == other_entity {
Transform::from_xyz(world_position.x, world_position.y, 0.0), continue;
Ball, }
)); let distance = transform
} .translation
} .xy()
.distance(other_transform.translation.xy());
fn spawn_screen_edges(
commands: &mut Commands, if distance > 1.0 && distance < PROTECTED_RANGE {
meshes: &mut Assets<Mesh>, separation +=
materials: &mut Assets<ColorMaterial>, (transform.translation.xy() - other_transform.translation.xy()) / distance;
size: Vec2, } else if distance < VISIBLE_RANGE {
) { avg_speed += other_boid.velocity;
const EDGE_COLOR: Color = Color::srgb_u8(255, 255, 255); avg_pos += other_transform.translation.xy();
nb_neighbors += 1;
let material = materials.add(EDGE_COLOR); }
}
for edge in [ if nb_neighbors > 0 {
ScreenEdge::Top, avg_speed /= nb_neighbors as f32;
ScreenEdge::Bottom, avg_pos /= nb_neighbors as f32;
ScreenEdge::Left, }
ScreenEdge::Right, model_updates.insert(
] { entity,
let (collider, transform, rect_size) = edge_shape(edge, size); Model {
commands.spawn(( separation,
RigidBody::Static, alignment: avg_speed - boid.velocity,
collider, cohesion: avg_pos - transform.translation.xy(),
transform, },
edge, );
Mesh2d(meshes.add(Rectangle::from_size(rect_size))), }
MeshMaterial2d(material.clone()),
)); for (entity, mut boid, mut transform) in query.iter_mut() {
} let mut acceleration = Vec2::new(0.0, 0.0);
} if transform.translation.x < -x_bound / 2.0 {
acceleration.x = 1.0;
fn edge_shape(edge: ScreenEdge, size: Vec2) -> (Collider, Transform, Vec2) { } else if transform.translation.x > x_bound / 2.0 {
const EDGE_THICKNESS: f32 = 5.0; acceleration.x = -1.0;
}
let half = size / 2.0;
let thickness = EDGE_THICKNESS; if transform.translation.y < -y_bound / 2.0 {
acceleration.y = 1.0;
match edge { } else if transform.translation.y > y_bound / 2.0 {
ScreenEdge::Top => { acceleration.y = -1.0;
let rect = Vec2::new(size.x, thickness); }
(
Collider::rectangle(rect.x, rect.y), let out_of_bounds_acceleration = acceleration.normalize_or_zero();
Transform::from_xyz(0.0, half.y - thickness / 2.0, 0.0),
rect, let model_update = model_updates.get(&entity).unwrap();
)
} // Update velocity and apply forces to position
ScreenEdge::Bottom => { boid.velocity += (out_of_bounds_acceleration
let rect = Vec2::new(size.x, thickness); + model_update.separation.normalize_or_zero() * 5.
( + model_update.alignment.normalize_or_zero()
Collider::rectangle(rect.x, rect.y), + model_update.cohesion.normalize_or_zero())
Transform::from_xyz(0.0, -half.y + thickness / 2.0, 0.0), * BOID_MAX_VELOCITY
rect, * dt;
) boid.velocity = boid.velocity.clamp_length_max(BOID_MAX_VELOCITY);
}
ScreenEdge::Left => { transform.translation.x += boid.velocity.x * dt;
let rect = Vec2::new(thickness, size.y); transform.translation.y += boid.velocity.y * dt;
( transform.rotation = Quat::from_rotation_z(boid.velocity.y.atan2(boid.velocity.x));
Collider::rectangle(rect.x, rect.y),
Transform::from_xyz(-half.x + thickness / 2.0, 0.0, 0.0),
rect,
)
}
ScreenEdge::Right => {
let rect = Vec2::new(thickness, size.y);
(
Collider::rectangle(rect.x, rect.y),
Transform::from_xyz(half.x - thickness / 2.0, 0.0, 0.0),
rect,
)
}
}
}
fn update_screen_edges(
mut resized: PopulatedMessageReader<WindowResized>,
mut edges: Query<(&ScreenEdge, &mut Collider, &mut Transform, &Mesh2d)>,
mut meshes: ResMut<Assets<Mesh>>,
) {
for event in resized.read() {
let size = Vec2::new(event.width, event.height);
for (edge, mut collider, mut transform, mesh2d) in &mut edges {
let (new_collider, new_transform, rect_size) = edge_shape(*edge, size);
*collider = new_collider;
*transform = new_transform;
if let Some(mut mesh) = meshes.get_mut(&mesh2d.0) {
*mesh = Rectangle::from_size(rect_size).into();
}
}
} }
} }

18
flake.nix
View file

@ -10,7 +10,8 @@
}; };
}; };
outputs = inputs@{ outputs =
inputs@{
flake-parts, flake-parts,
nixpkgs, nixpkgs,
rust-overlay, rust-overlay,
@ -24,7 +25,8 @@
"aarch64-darwin" "aarch64-darwin"
]; ];
perSystem = { pkgs, system, ... }: perSystem =
{ pkgs, system, ... }:
let let
overlays = [ (import rust-overlay) ]; overlays = [ (import rust-overlay) ];
rustPkgs = import nixpkgs { rustPkgs = import nixpkgs {
@ -33,22 +35,21 @@
rustToolchain = rustPkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml; rustToolchain = rustPkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
cargoLock = fromTOML (builtins.readFile ./Cargo.lock); cargoLock = fromTOML (builtins.readFile ./Cargo.lock);
wasmBindgen = pkgs.lib.findFirst wasmBindgen = pkgs.lib.findFirst (
(pkg: pkg.name == "wasm-bindgen") pkg: pkg.name == "wasm-bindgen"
(throw "Could not find wasm-bindgen package") ) (throw "Could not find wasm-bindgen package") cargoLock.package;
cargoLock.package;
wasm-bindgen-cli = pkgs.buildWasmBindgenCli rec { wasm-bindgen-cli = pkgs.buildWasmBindgenCli rec {
src = pkgs.fetchCrate { src = pkgs.fetchCrate {
pname = "wasm-bindgen-cli"; pname = "wasm-bindgen-cli";
version = wasmBindgen.version; version = wasmBindgen.version;
hash = "sha256-a7lcXJnnZkYReja+iUO7NqqrWyv3toxnUgQb8s4IS5s="; hash = "sha256-pcecKQd7E8Opw6bkFoE569epUi7gh5qpQF1e5PJY6V8=";
}; };
cargoDeps = pkgs.rustPlatform.fetchCargoVendor { cargoDeps = pkgs.rustPlatform.fetchCargoVendor {
inherit src; inherit src;
inherit (src) pname version; inherit (src) pname version;
hash = "sha256-R1Tas33Ursy8kqsxguAkG0ZhNed2n5uFTAhw1l2qlLY="; hash = "sha256-vmUrWVU7kPJJxO5qIVeAkwQyWDELO1Z4Z5gitz2kco8=";
}; };
}; };
in in
@ -60,6 +61,7 @@
pkgs.binaryen pkgs.binaryen
pkgs.brotli pkgs.brotli
pkgs.just pkgs.just
pkgs.watchexec
]; ];
}; };
}; };