random boid angle

src/main.rs

@@ -63,6 +63,8 @@ fn alignment(mut boids: Query<(Entity, &Transform, &mut SeperationAcceleration),
 fn move_boids(mut boids: Query<(&mut Transform, &Velocity), With<Boid>>, time: Res<Time>) {
     for (mut transform, velocity) in &mut boids {
         transform.translation += velocity.0.extend(0.) * time.delta_seconds();
+        transform.rotation =
+            Quat::from_rotation_z(velocity.0.to_angle() - std::f32::consts::FRAC_PI_2);
     }
 }
 
@@ -78,9 +80,13 @@ fn setup(
     let upper_bound = 100.;
 
     for i in 0..100 {
+        use std::f32::consts::TAU;
+
         let x = small_rng.gen_range(lower_bound..=upper_bound);
         let y = small_rng.gen_range(lower_bound..=upper_bound);
 
+        let angle = small_rng.gen_range(-TAU..=TAU);
+
         commands.spawn(BoidBundle {
             mesh: MaterialMesh2dBundle {
                 mesh: boid_mesh.0.clone(),
@@ -89,7 +95,7 @@ fn setup(
                     .with_translation(Vec3::new(x, y, 0.)),
                 ..default()
             },
-            velocity: Velocity(Vec2::Y * 100.),
+            velocity: Velocity(Vec2::from_angle(angle) * 100.),
             ..default()
         });
     }