153 lines
4 KiB
Rust
153 lines
4 KiB
Rust
mod gen;
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use bevy::{ecs::query::BatchingStrategy, prelude::*, sprite::MaterialMesh2dBundle};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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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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.run();
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}
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fn setup(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<ColorMaterial>>,
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) {
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commands.spawn(Camera2dBundle {
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camera: Camera { ..default() },
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..default()
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});
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commands.spawn(Planet {
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mass: Mass(1.9885e18),
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speed: Speed { x: 0., y: 0. },
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mesh: 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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transform: Transform::from_translation(Vec3::new(0., 0., 0.)),
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..default()
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},
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});
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commands.spawn(Planet {
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mass: Mass(5.9736e14),
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speed: Speed { x: 0., y: 500. },
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mesh: 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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transform: Transform::from_translation(Vec3::new(400., 0., 0.)),
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..default()
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},
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});
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commands.spawn(Planet {
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mass: Mass(5.9736e14),
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speed: Speed { x: 0., y: -500. },
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mesh: 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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transform: Transform::from_translation(Vec3::new(-400., 0., 0.)),
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..default()
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},
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});
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for i in 0..100u32 {
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commands.spawn(Planet {
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mass: Mass(1.),
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speed: Speed { x: 0., y: -500. },
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mesh: MaterialMesh2dBundle {
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mesh: meshes.add(shape::Circle::new(5.).into()).into(),
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material: materials.add(ColorMaterial::from(Color::RED)),
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transform: Transform::from_translation(Vec3::new(-450. - i as f32 / 4., 0., 0.)),
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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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}
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#[derive(Component)]
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struct Speed {
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x: f32,
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y: f32,
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}
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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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mass: Mass,
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speed: Speed,
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mesh: MaterialMesh2dBundle<ColorMaterial>,
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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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/*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 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.x * dt;
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pos.translation.y += speed.y * dt;
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});
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}
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