Parallax system + example, need to integrate into flappy bird

.gitattributes

@@ -1 +0,0 @@
-*.ogg filter=lfs diff=lfs merge=lfs -text

assets/.gitattributes

@@ -1,2 +1,3 @@
-*.png filter=lfs diff=lfs merge=lfs -text
+*.ogg filter=lfs diff=lfs merge=lfs -text
 *.xcf filter=lfs diff=lfs merge=lfs -text
+*.png filter=lfs diff=lfs merge=lfs -text

assets/flappy/CREDITS

@@ -2,8 +2,10 @@ Programming: Elijah Voigt
 
 Art Assets: Kenney.nl
 1-Bit Platformer Pack
+Impact Sounds
 
 Engine: Bevy
 Physics: Avian2D
 
-Inspired by Flappy Bird (2013) by Dong Nguyen
+Inspired by:
+Flappy Bird (2013) by Dong Nguyen

examples/parallax.rs

@@ -0,0 +1,55 @@
+use games::*;
+
+fn main() {
+    App::new()
+        .add_plugins((BaseGamePlugin {
+            name: "parallax example".into(),
+            title: "Parallax".into(),
+            game_type: GameType::Two,
+        },))
+        .add_systems(Startup, spawn_background)
+        .add_systems(Update, move_camera)
+        .add_systems(Update, parallax_gizmos)
+        .run();
+}
+
+fn spawn_background(
+    mut commands: Commands,
+) {
+    commands.spawn((Parallax(1.0), children![(Text2d("1.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))]));
+    commands.spawn((Parallax(2.0), children![(Text2d("2.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))]));
+    commands.spawn((Parallax(4.0), children![(Text2d("4.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))]));
+    commands.spawn((Parallax(8.0), children![(Text2d("8.0".into()), Transform::from_xyz(0.0, 35.0, 0.0))]));
+}
+
+fn move_camera(
+    mut t: Single<&mut Transform, With<Camera2d>>,
+    keys: Res<ButtonInput<KeyCode>>,
+) {
+    if keys.pressed(KeyCode::ArrowLeft) {
+        t.translation.x -= 5.0;
+    } else if keys.pressed(KeyCode::ArrowRight) {
+        t.translation.x += 5.0;
+    }
+
+    if keys.pressed(KeyCode::ArrowDown) {
+        t.translation.y -= 5.0;
+    } else if keys.pressed(KeyCode::ArrowUp) {
+        t.translation.y += 5.0;
+    }
+}
+fn parallax_gizmos(
+    mut gizmos: Gizmos,
+    q: Query<&Transform, With<Parallax>>,
+) {
+    // Closest to camera
+    // Parallax(1)
+    q.iter().for_each(|t| {
+        gizmos.grid_2d(
+            t.translation.truncate(),
+            UVec2::new(5, 5),
+            Vec2::splat(10.),
+            RED,
+        ).outer_edges();
+    });
+}

src/base_game.rs

@@ -42,6 +42,7 @@ impl Plugin for BaseGamePlugin {
         .add_plugins(MeshPickingPlugin)
         .add_plugins(LoadingPlugin)
         .add_plugins(BaseUiPlugin)
+        .add_plugins(ParallaxPlugin)
         .init_resource::<Rand>();
 
         match self.game_type {

src/bin/flappy/main.rs

@@ -39,9 +39,11 @@ fn main() {
             ),
         )
         .add_systems(OnEnter(PlayerState::Alive), alive_bird)
+        .add_systems(OnEnter(PlayerState::Alive), reset_button::<FlapButton>)
         .add_systems(OnEnter(PlayerState::Rewind), (start_rewinding, alive_bird))
         .add_systems(OnEnter(PlayerState::Pause), pause_bird)
         .add_systems(OnEnter(PlayerState::Stasis), pause_bird)
+        .add_systems(OnExit(PlayerState::Stasis), reset_button::<RewindButton>)
         .add_systems(
             Update,
             (
@@ -85,14 +87,13 @@ fn main() {
                     sync_resource_to_ui::<Deaths>.run_if(resource_changed::<Deaths>),
                     sync_resource_to_ui::<RewindFrames>.run_if(resource_changed::<RewindFrames>),
                 ),
-                (
-                    update_tooltip,
-                    debug_trail,
-                ).run_if(in_state(DebuggingState::On)),
+                (update_tooltip, debug_trail).run_if(in_state(DebuggingState::On)),
                 // TODO: Add run_if to this system
                 update_batch_position.run_if(any_component_changed::<Batch>),
                 move_batches.run_if(on_event::<CollisionStarted>),
                 manage_score.run_if(on_event::<CollisionStarted>.or(on_event::<CollisionEnded>)),
+                shimmer_button::<RewindButton>.run_if(in_state(PlayerState::Stasis)),
+                shimmer_button::<FlapButton>.run_if(in_state(PlayerState::Pause)),
             ),
         )
         .add_observer(flap)
@@ -139,10 +140,7 @@ struct Tape {
     rotations: Vec<Rotation>,
 }
 
-fn init_bird(
-    mut commands: Commands,
-    bird_assets: Res<BirdAssets>,
-) {
+fn init_bird(mut commands: Commands, bird_assets: Res<BirdAssets>) {
     let name = Name::new("bird");
 
     let t = Transform::from_xyz(0.0, 0.0, 0.0).with_scale(Vec3::splat(50.0));
@@ -407,12 +405,18 @@ fn init_assets(
 #[derive(Component)]
 struct FlapSfx;
 
+#[derive(Component)]
+struct FlapButton;
+
 #[derive(Component)]
 struct BonkSfx;
 
 #[derive(Component)]
 struct RewindSfx;
 
+#[derive(Component)]
+struct RewindButton;
+
 fn init_ui(mut commands: Commands) {
     commands
         .spawn((
@@ -524,39 +528,63 @@ fn init_ui(mut commands: Commands) {
         next.set(PlayerState::Alive);
     }
 
-    commands
-        .spawn((
+    commands.spawn((
         Node {
             align_self: AlignSelf::Center,
             justify_self: JustifySelf::Center,
             flex_direction: FlexDirection::Column,
             ..default()
         },
-            Button,
         PlayerState::Pause,
-            children![Text::new("Go!"),],
-        ))
-        .observe(start_game);
+        Text::new("PAUSED"),
+    ));
 
     commands
         .spawn(Node {
             align_self: AlignSelf::End,
             justify_self: JustifySelf::Center,
             flex_direction: FlexDirection::Row,
+            justify_content: JustifyContent::SpaceEvenly,
+            width: Val::Percent(100.0),
+            min_height: Val::Percent(10.0),
             ..default()
         })
         .with_children(|parent| {
             parent
                 .spawn((
-                    Node { ..default() },
+                    Node {
+                        width: Val::Percent(50.0),
+                        align_items: AlignItems::Center,
+                        justify_content: JustifyContent::Center,
+                        ..default()
+                    },
                     Button,
-                    children![Text::new("Rewind!"),],
+                    BackgroundColor::default(),
+                    RewindButton,
+                    children![
+                        Text::new("Rewind! (R)"),
+                        TextLayout::new_with_justify(JustifyText::Center)
+                    ],
                 ))
                 .observe(start_rewind)
                 .observe(end_rewind);
 
             parent
-                .spawn((Node { ..default() }, Button, children![Text::new("Flap!"),]))
+                .spawn((
+                    Node {
+                        width: Val::Percent(50.0),
+                        align_items: AlignItems::Center,
+                        justify_content: JustifyContent::Center,
+                        ..default()
+                    },
+                    Button,
+                    FlapButton,
+                    children![
+                        Text::new("Flap! (Spacebar)"),
+                        TextFont::from_font_size(30.0),
+                        TextLayout::new_with_justify(JustifyText::Center)
+                    ],
+                ))
                 .observe(flap_button);
         });
 
@@ -567,9 +595,11 @@ fn init_ui(mut commands: Commands) {
             ..default()
         },
         BackgroundColor(WHITE.into()),
+        children![(
             SyncResource::<Score>::default(),
             Text::default(),
             TextLayout::new_with_justify(JustifyText::Center),
+        )]
     ));
 }
 
@@ -585,7 +615,12 @@ fn flap_button(
     _trigger: Trigger<Pointer<Pressed>>,
     mut commands: Commands,
     bird: Single<Entity, With<Bird>>,
+    curr: Res<State<PlayerState>>,
+    mut next: ResMut<NextState<PlayerState>>,
 ) {
+    if !matches!(curr.get(), PlayerState::Alive) {
+        next.set(PlayerState::Alive);
+    }
     let e = *bird;
     debug!("Flapping {:?}", e);
     commands.trigger_targets(Flap, e);
@@ -622,7 +657,10 @@ fn flap(
         // Play flap sfx
         commands.spawn((
             AudioPlayer::new(server.load("flappy/bonk.ogg")),
-            PlaybackSettings { mode: PlaybackMode::Despawn, ..default() },
+            PlaybackSettings {
+                mode: PlaybackMode::Despawn,
+                ..default()
+            },
             BonkSfx,
         ));
     }
@@ -780,7 +818,10 @@ fn detect_dead(
         // Play bonk sfx
         commands.spawn((
             AudioPlayer::new(server.load("flappy/flap.ogg")),
-            PlaybackSettings { mode: PlaybackMode::Despawn, ..default() },
+            PlaybackSettings {
+                mode: PlaybackMode::Despawn,
+                ..default()
+            },
             FlapSfx,
         ));
     }
@@ -912,7 +953,7 @@ fn move_batches(
             } else if hitboxes.contains(*a) {
                 *a
             } else {
-                return
+                return;
             }
         };
 
@@ -962,7 +1003,7 @@ fn update_tooltip(
 }
 
 fn debug_trail(
-    mut physics_objects: Query<(Entity ,&Transform), With<Mass>>,
+    mut physics_objects: Query<(Entity, &Transform), With<Mass>>,
     mut gizmos: Gizmos,
     mut positions: Local<HashMap<Entity, VecDeque<Vec3>>>,
 ) {
@@ -984,13 +1025,26 @@ fn debug_trail(
     })
 }
 
-fn start_rewinding(
-    server: ResMut<AssetServer>,
-    mut commands: Commands,
-) {
+fn start_rewinding(server: ResMut<AssetServer>, mut commands: Commands) {
     commands.spawn((
         AudioPlayer::new(server.load("flappy/rewind-start.ogg")),
-        PlaybackSettings { mode: PlaybackMode::Despawn, ..default() },
+        PlaybackSettings {
+            mode: PlaybackMode::Despawn,
+            ..default()
+        },
         RewindSfx,
     ));
 }
+
+fn shimmer_button<T: Component>(mut bg: Single<&mut BackgroundColor, With<T>>, time: Res<Time>) {
+    let t = time.elapsed_secs();
+    let period = 3.0;
+    let r = (((t / period) % 1.0) * std::f32::consts::PI).cos();
+    let g = ((((t / period) + 0.3) % 1.0) * std::f32::consts::PI).cos();
+    let b = ((((t / period) + 0.6) % 1.0) * std::f32::consts::PI).cos();
+    bg.0 = Srgba::rgb(r, g, b).into();
+}
+
+fn reset_button<T: Component>(mut bg: Single<&mut BackgroundColor, With<T>>) {
+    bg.0 = WHITE.into();
+}

src/lib.rs

@@ -9,11 +9,12 @@ pub mod physics3d;
 mod scheduling;
 mod ui;
 mod version;
+mod parallax;
 
 // Rust stdlib
+pub use std::collections::VecDeque;
 pub use std::f32::consts::PI;
 pub use std::fmt::Display;
-pub use std::collections::VecDeque;
 
 // Community libraries
 pub use bevy::{
@@ -44,3 +45,4 @@ pub use loading::*;
 pub use scheduling::*;
 pub use ui::*;
 pub use version::*;
+pub use parallax::*;

src/parallax.rs

@@ -0,0 +1,27 @@
+use super::*;
+
+pub struct ParallaxPlugin;
+
+impl Plugin for ParallaxPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_systems(Update, move_parallax_items.run_if(any_component_changed::<Transform>));
+    }
+}
+
+#[derive(Component)]
+#[require(Transform)]
+pub struct Parallax(pub f32);
+
+fn move_parallax_items(
+    mut q: Query<(&mut Transform, &Parallax), Without<Camera2d>>,
+    cam_t: Single<&Transform, With<Camera2d>>,
+) {
+    let base = cam_t.translation.truncate();
+
+    q.iter_mut().for_each(|(mut t, p)| {
+        let val = base * (1.0 - (1.0 / p.0));
+        t.translation.x = val.x;
+        t.translation.y = val.y;
+    });
+}
+