Add basic loading state

src/game/setup.rs

@@ -11,6 +11,8 @@ use bevy::{
 use rand::{Rng as _, SeedableRng};
 use wyrand::WyRand;
 
+use crate::AppState;
+
 use super::{
     objects::{Ball, Player, Radius, Wall},
     rng::thread_rng,
@@ -21,6 +23,12 @@ const BALL_COUNT: u8 = 32;
 const BALL_SIZES: Range<f32> = 10.0..25.0;
 const DIMENSION_SIZES: Range<f32> = 500.0..2000.0;
 
+pub fn check_for_seed(seed: Option<Res<Seed>>, mut next_state: ResMut<NextState<AppState>>) {
+    if seed.is_some() {
+        next_state.set(AppState::InGame);
+    }
+}
+
 /// The size of the playable area (x, y)
 #[derive(Resource)]
 pub struct PlayableArea(f32, f32);

src/lib.rs

@@ -11,7 +11,7 @@ mod game;
 use game::{
     runtime::{move_camera, move_player, quit, zoom_camera},
     seed::Seed,
-    setup::{setup_balls, setup_from_seed, setup_player, setup_ui, setup_walls},
+    setup::{check_for_seed, setup_balls, setup_from_seed, setup_player, setup_ui, setup_walls},
 };
 
 /// The initial configuration passed to the game's setup functions.
@@ -39,6 +39,13 @@ struct Source {
     connect: Option<SocketAddr>,
 }
 
+#[derive(States, Default, Debug, Clone, PartialEq, Eq, Hash)]
+enum AppState {
+    #[default]
+    Loading,
+    InGame,
+}
+
 impl Plugin for AppSettings {
     fn build(&self, app: &mut App) {
         app.insert_resource(Gravity(Vector::ZERO))
@@ -56,23 +63,25 @@ impl Plugin for AppSettings {
                 #[cfg(feature = "dev")]
                 dev::dev_tools,
             ))
+            .init_state::<AppState>()
+            .add_systems(Startup, setup_ui)
             .add_systems(
-                Startup,
+                OnEnter(AppState::InGame),
                 (
                     setup_from_seed,
-                    setup_ui,
                     (setup_player, setup_balls, setup_walls).after(setup_from_seed),
                 ),
             )
             .add_systems(
                 Update,
                 (
-                    move_player,
+                    check_for_seed.run_if(in_state(AppState::Loading)),
+                    (move_player, move_camera.after(move_player), zoom_camera)
+                        .run_if(in_state(AppState::InGame)),
                     quit.run_if(input_pressed(KeyCode::KeyQ)),
-                    zoom_camera,
                 ),
-            )
-            .add_systems(PostUpdate, move_camera);
+            );
+
         if let Some(ref seed) = self.source.seed {
             app.insert_resource(seed.clone());
         } else if let Some(ref peer) = self.source.connect {