Simple physics: we fall, we hit object, we stop

src/dev_tools.rs

@@ -24,6 +24,11 @@ pub(super) fn plugin(app: &mut App) {
 
     // Avian
     app.add_plugins((FrameTimeDiagnosticsPlugin, PhysicsDebugPlugin::default()));
+    app.insert_gizmo_config(PhysicsGizmos::default(), GizmoConfig {
+        // Off by default, enables with toggle key
+        enabled: false,
+        ..default()
+    });
 }
 
 const TOGGLE_KEY: KeyCode = KeyCode::Backquote;

src/lib.rs

@@ -54,7 +54,7 @@ impl Plugin for GamePlugin {
                 }),
         );
 
-        app.add_plugins(PhysicsPlugins::default());
+        app.add_plugins(PhysicsPlugins::default().with_length_unit(20.0));
 
         app.add_plugins((assets::plugin, screens::plugin, game::plugin));
 

src/screens/ingame/playing.rs

@@ -1,10 +1,54 @@
-use avian2d::prelude::*;
+use avian2d::{
+    math::{Scalar, Vector},
+    prelude::*,
+};
 use bevy::prelude::*;
 
-use crate::game::Game;
+use crate::screens::Screen;
 
 pub fn plugin(app: &mut App) {
-    app.add_systems(OnEnter(Game::Playing), init);
+    app.add_systems(OnEnter(Screen::InGame), init);
+    app.insert_resource(Gravity(Vector::NEG_Y * 1000.0));
 }
 
-fn init() {}
+#[derive(Component, Debug)]
+struct Player;
+
+#[derive(Component)]
+struct MovementSpeed(Scalar);
+
+fn init(
+    mut commands: Commands,
+    mut materials: ResMut<Assets<ColorMaterial>>,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut time: ResMut<Time<Physics>>,
+) {
+    let platform = Sprite {
+        color: Color::srgba(0.7, 0.7, 0.8, 0.25),
+        custom_size: Some(Vec2::splat(50.0)),
+        ..default()
+    };
+    commands.spawn((
+        Name::new("Platform"),
+        platform.clone(),
+        Collider::rectangle(50., 50.),
+        RigidBody::Static,
+        StateScoped(Screen::InGame),
+        Transform::from_xyz(0., 16. * 6., 0.).with_scale(Vec3::new(10., 0.5, 10.)),
+    ));
+
+    commands.spawn((
+        Name::new("Player"),
+        Player,
+        Collider::circle(20.),
+        LockedAxes::ROTATION_LOCKED,
+        Mesh2d(meshes.add(Circle::new(20.))),
+        MeshMaterial2d(materials.add(Color::srgb(0.2, 0.7, 0.9))),
+        MovementSpeed(250.),
+        Restitution::ZERO.with_combine_rule(CoefficientCombine::Min),
+        RigidBody::Dynamic,
+        StateScoped(Screen::InGame),
+        Transform::from_xyz(0., 200., 0.),
+    ));
+    time.unpause();
+}