stef_buwalda/RustPhysics
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Added a gravity system.

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Stef
2025-12-24 10:56:35 +01:00
parent 384ea0f7a1
commit a339776e2f
1 changed files with 18 additions and 4 deletions
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22
app/src/main.rs
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@@ -2,12 +2,13 @@ use bevy::color::palettes::basic::RED;
use bevy::log; use bevy::log;
use bevy::prelude::*; // Core Bevy types use bevy::prelude::*; // Core Bevy types
const GRAVITY: f32 = -20.0;
fn main() { fn main() {
App::new() App::new()
.add_plugins(DefaultPlugins) .add_plugins(DefaultPlugins)
.add_systems(Startup, setup) .add_systems(Startup, setup)
.add_systems(Update, velocity_timestep) .add_systems(Update, (apply_gravity, velocity_timestep).chain())
.run(); .run();
} }
@@ -17,10 +18,17 @@ fn setup(mut commands: Commands, mut meshes: ResMut<Assets<Mesh>>, mut materials
let shape =meshes.add(Circle::new(50.0)); let shape =meshes.add(Circle::new(50.0));
commands.spawn((Mesh2d(shape.clone()), MeshMaterial2d(materials.add(Color::from(RED))), Transform::from_xyz(100.0, 0.0, 0.0), Velocity(vec3(0.0, 100.0, 0.0)))); commands.spawn((Mesh2d(shape.clone()), MeshMaterial2d(materials.add(Color::from(RED))), Transform::from_xyz(100.0, 0.0, 0.0), Velocity(vec3(
0.0,
100.0,
0.0
))));
commands.spawn((Mesh2d(shape.clone()), MeshMaterial2d(materials.add(Color::from(RED))), Transform::from_xyz(0.0, 0.0, 0.0), Velocity(vec3(0.0, 100.0, 0.0)))); commands.spawn((Mesh2d(shape.clone()), MeshMaterial2d(materials.add(Color::from(RED))), Transform::from_xyz(300.0, 0.0, 0.0), Velocity(vec3(
} 0.0,
50.0,
0.0
))));}
#[derive(Component)] #[derive(Component)]
struct Velocity(Vec3); struct Velocity(Vec3);
@@ -29,4 +37,10 @@ fn velocity_timestep(time: Res<Time>, mut query: Query<(&Velocity, &mut Transfor
for (velocity, mut transform) in query.iter_mut() { for (velocity, mut transform) in query.iter_mut() {
transform.translation += velocity.0 * time.delta_secs(); transform.translation += velocity.0 * time.delta_secs();
} }
}
fn apply_gravity(time: Res<Time>, mut query: Query<&mut Velocity>) {
for mut velocity in query.iter_mut() {
velocity.0.y += GRAVITY * time.delta_secs();
}
} }