single to query

src/player.rs

@@ -8,6 +8,7 @@ const FALL_SPEED: f32 = 600.0; // Falling speed
 const DIVE_SPEED: f32 = 1000.0; // Falling speed sped up
 const HORIZONTAL_SPEED: f32 = 350.0; // Lateral movement speed
 pub const START_POSITION: Vec3 = Vec3::new(0.0, 0.0, 2.0); // Start position
+const RATE: f32 = 13.0; // Inertia rate
 
 // The player
 #[derive(Component)]
@@ -66,7 +67,8 @@ pub(crate) fn move_player(
         0.0
     };
 
-    velocity.0 = Vec2::new(
+    let facteur = 1.0 - (-RATE * time.delta_secs()).exp();
+    let target = Vec2::new(
         direction * HORIZONTAL_SPEED,
         -if input.pressed(KeyCode::KeyS) {
             DIVE_SPEED
@@ -75,24 +77,28 @@ pub(crate) fn move_player(
         },
     );
 
+    velocity.0 = velocity.0.lerp(target, facteur);
+
     // Position update (no smoothness in velocity)
     transform.translation += velocity.0.extend(0.0) * time.delta_secs();
 }
 
 // Reset player position
 pub fn reset_player(
-    mut player: Single<(&mut Transform, &mut Sprite), With<Player>>,
+    mut player: Single<(&mut Transform, &mut Velocity, &mut Sprite), With<Player>>,
     input: Res<ButtonInput<KeyCode>>,
     mut has_collided: ResMut<HasCollided>,
     mut fall_started: ResMut<FallStarted>,
     mut regenerate_obstacles: ResMut<RegenerateObstacles>,
 ) {
-    let (mut transform, mut sprite) = player.into_inner();
+    let (mut transform, mut velocity, mut sprite) = player.into_inner();
 
     // R key for reset or player has collider
     if input.just_pressed(KeyCode::KeyR) || has_collided.0 {
         transform.translation = Vec3::new(START_POSITION.x, START_POSITION.y, START_POSITION.z);
+        velocity.0 = Vec2::ZERO;
         sprite.color = Color::WHITE;
+
         has_collided.0 = false;
         fall_started.0 = false;
         regenerate_obstacles.0 = true;