Dev version bump to 0.6.0-dev3

I'm moving on from asset stuff, so I'm considering this a "new version."

Next up: Fixing the Makefile to understand the sound files.

.gitignore

@@ -1 +1,2 @@
 /target
+/out

Cargo.toml

@@ -1,20 +1,22 @@
 [package]
 name = "asteroids"
-version = "0.3.0"
+version = "0.6.0-dev3"
 edition = "2024"
+license = "AGPL-3.0-only"
 
 [dependencies]
-bevy = "0.16"
-bevy-inspector-egui = "0.32.0"
-bevy_rapier2d = "0.31.0"
-rand = "0.9.2"
+bevy = "0.17"
+bevy-inspector-egui = "0.34"
+bevy_rapier2d = "0.32"
+rand = "0.9"
 
 [features]
+default = ["dynamic_linking"]
 dynamic_linking = ["bevy/dynamic_linking"]
 debug_ui = ["bevy_rapier2d/debug-render-2d"]
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
-getrandom = { version = "0.3.3", features = ["wasm_js"] }
+getrandom = { version = "0.3", features = ["wasm_js"] }
 
 [profile.speedy]
 inherits = "release"

Dockerfile

@@ -0,0 +1,17 @@
+FROM rust:1.89 AS builder
+
+RUN rustup target add wasm32-unknown-unknown
+RUN cargo install --locked wasm-bindgen-cli
+
+COPY . .
+
+RUN make -j
+
+FROM busybox:musl
+RUN mkdir -p /var/www
+COPY --from=builder ./out/ /var/www
+WORKDIR /var/www
+
+# TODO: Make httpd accept interrupt signals so the container exits properly.
+# (<ctrl>+c and `docker stop ...` don't work because Busybox doesn't answer)
+CMD ["httpd", "-f", "-p", "8080"]

LICENSE

@@ -0,0 +1,661 @@
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+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

Makefile

@@ -0,0 +1,72 @@
+##
+## This Makefile exists to produce WASM builds.
+## Do not use it if that isn't your goal!
+##
+
+# Patch these to select a different build profile or target
+# The target shouldn't change any time soon. WASM64, I guess. Other targets
+# aren't aimed at the web, so you shouldn't be using this makefile.
+CARGO_TARGET := wasm32-unknown-unknown
+CARGO_PROFILE := tiny
+
+SRC_DIR = ./src
+SRCS := $(wildcard $(SRC_DIR)/**)
+
+.PHONY: clean full-clean tarball tarball-standalone web web-standalone
+
+# "Standalone" version. It includes an index.html to serve as-is
+web-standalone: out/asteroids.js out/asteroids_bg.wasm.gz out/index.html
+
+# "Bundle-able" version. It has a page, but no index.html. Consumers are
+# expected to provide their own index.html and link to this page.
+web: out/asteroids.js out/asteroids_bg.wasm.gz out/asteroids.html
+
+tarball: asteroids_web_root.tar
+
+tarball_standalone: asteroids_web_root_standalone.tar
+
+asteroids_web_root.tar: out/asteroids.js out/asteroids_bg.wasm.gz out/asteroids.html
+	tar -caf $@ $^
+
+asteroids_web_root_standalone.tar: out/asteroids.js out/asteroids_bg.wasm.gz out/index.html
+	tar -caf $@ $^
+
+target/$(CARGO_TARGET)/$(CARGO_PROFILE)/asteroids.wasm: $(SRCS) Cargo.lock Cargo.toml
+	cargo build --profile $(CARGO_PROFILE) --target $(CARGO_TARGET)
+
+out:
+	mkdir $@
+
+# Both the JS and WASM files are generated by the wasm-bindgen call, so both
+# get to be on the target half of this recipe.
+out/asteroids.js out/asteroids_bg.wasm.gz &: target/$(CARGO_TARGET)/$(CARGO_PROFILE)/asteroids.wasm | out
+	wasm-bindgen --no-typescript --target web --out-dir ./out/ --out-name asteroids target/$(CARGO_TARGET)/$(CARGO_PROFILE)/asteroids.wasm
+	gzip -9 -f out/asteroids_bg.wasm
+
+# Copies the index page to the output dir.
+out/index.html: www/index.html
+	cp -a $< $@
+	rm -f out/asteroids.html
+
+# Like `out/index.html`, but renames the page for use in a larger site.
+out/asteroids.html: www/index.html
+	cp -a $< $@
+	rm -f out/index.html
+
+# Clean the web build, but not the Cargo cache. Cargo handles it's own caching
+# and I don't want to obliterate it all the time.
+clean:
+	rm -rf out/ asteroids_web_root.tar asteroids_web_root_standalone.tar
+
+# Delete everything, including the Cargo build cache. In case someone needs
+# this, I guess.
+full-clean: clean
+	cargo clean
+
+# Installation goal. It's meant to be a helper utility for moving the built
+# output into the web root. Only supports the "bundle-able" mode.
+install: web
+	install -dm0755 $(DESTDIR)
+	install -m0644 out/asteroids.js $(DESTDIR)/
+	install -m0644 out/asteroids_bg.wasm.gz $(DESTDIR)/
+	install -m0644 out/asteroids.html $(DESTDIR)/

README.md

@@ -0,0 +1,14 @@
+# Asteroids
+
+*Another* Asteroids game I'm making. This time in Rust with the Bevy game engine.
+
+## License
+
+| File(s) | License |
+|-|-|
+| * | AGPLv3 |
+| assets/* | CC0 |
+
+(the most-specific match is the applicable license)
+
+The sound files are from KenneyNL's "Sci-Fi Sounds (1.0)" pack. Find their work at [www.kenney.nl].

src/config.rs

@@ -3,26 +3,30 @@
 
 use bevy::color::Color;
 
-pub const WINDOW_SIZE: bevy::prelude::Vec2 = bevy::prelude::Vec2::new(800.0, 600.0);
+pub const WINDOW_SIZE: (u32, u32) = (800, 600);
 
 pub const UI_BUTTON_NORMAL: Color = Color::srgb(0.15, 0.15, 0.15); // Button color when it's just hanging out
 pub const UI_BUTTON_HOVERED: Color = Color::srgb(0.25, 0.25, 0.25); // ... when it's hovered
 pub const UI_BUTTON_PRESSED: Color = Color::srgb(0.55, 0.55, 0.55); // ... when it's pressed
 
-pub(crate) const BACKGROUND_COLOR: Color = Color::srgb(0.3, 0.3, 0.3);
+pub(crate) const BACKGROUND_COLOR: Color = Color::srgb(0.1, 0.1, 0.1);
 pub(crate) const PLAYER_SHIP_COLOR: Color = Color::srgb(1.0, 1.0, 1.0);
 pub(crate) const SHIP_THRUSTER_COLOR_ACTIVE: Color = Color::srgb(1.0, 0.2, 0.2);
 pub(crate) const SHIP_THRUSTER_COLOR_INACTIVE: Color = Color::srgb(0.5, 0.5, 0.5);
-pub(crate) const ASTEROID_SMALL_COLOR: Color = Color::srgb(1.0, 0., 0.);
-pub(crate) const BULLET_COLOR: Color = Color::srgb(0.0, 0.1, 0.9);
+pub(crate) const SHIP_FIRE_RATE: f32 = 3.0; // in bullets-per-second
+pub(crate) const ASTEROID_SMALL_COLOR: Color = Color::srgb(0.9, 0.9, 0.9);
+pub(crate) const ASTEROID_MEDIUM_COLOR: Color = Color::srgb(0.8, 0.8, 0.8);
+pub(crate) const ASTEROID_LARGE_COLOR: Color = Color::srgb(0.6, 0.6, 0.6);
+pub(crate) const BULLET_COLOR: Color = Color::srgb(0.9, 0.9, 0.9);
 // TODO: asteroid medium & large
 
-pub(crate) const SHIP_THRUST: f32 = 1.0;
+pub(crate) const SHIP_THRUST: f32 = 4.0;
 pub(crate) const SHIP_ROTATION: f32 = 4.0; // +/- rotation speed in... radians per frame
 
-pub(crate) const BULLET_SPEED: f32 = 150.0;
+pub(crate) const BULLET_SPEED: f32 = 500.0;
 pub(crate) const BULLET_LIFETIME: f32 = 2.0;
 
 pub(crate) const ASTEROID_LIFETIME: f32 = 40.0;
+pub(crate) const DEBRIS_LIFETIME: f32 = 3.0; // lifetime, in seconds
 
 pub const RNG_SEED: [u8; 32] = *b"12345678909876543210123456789098";

src/lib.rs

@@ -3,27 +3,26 @@
 //! Compile-time configurables can be found in the [`config`] module.
 
 pub mod config;
-mod events;
 mod machinery;
+mod messages;
 mod objects;
 mod physics;
 mod resources;
 mod widgets;
 
 use crate::config::{
-    ASTEROID_SMALL_COLOR, BACKGROUND_COLOR, BULLET_COLOR, BULLET_LIFETIME, BULLET_SPEED,
-    PLAYER_SHIP_COLOR, SHIP_ROTATION, SHIP_THRUST, SHIP_THRUSTER_COLOR_ACTIVE,
-    SHIP_THRUSTER_COLOR_INACTIVE,
+    ASTEROID_LARGE_COLOR, ASTEROID_MEDIUM_COLOR, ASTEROID_SMALL_COLOR, BACKGROUND_COLOR,
+    BULLET_COLOR, BULLET_LIFETIME, BULLET_SPEED, PLAYER_SHIP_COLOR, SHIP_ROTATION, SHIP_THRUST,
+    SHIP_THRUSTER_COLOR_ACTIVE, SHIP_THRUSTER_COLOR_INACTIVE,
 };
 use crate::machinery::AsteroidSpawner;
-use crate::objects::{Bullet, Ship};
+use crate::objects::{Bullet, Ship, Weapon};
 use crate::physics::AngularVelocity;
 
 use bevy::prelude::*;
 use bevy_rapier2d::{
     plugin::{NoUserData, RapierPhysicsPlugin},
     prelude::*,
-    render::RapierDebugRenderPlugin,
 };
 use machinery::Lifetime;
 use resources::{GameAssets, Lives, Score, WorldSize};
@@ -37,21 +36,20 @@ impl Plugin for AsteroidPlugin {
             widgets::PluginGameMenu,
             widgets::PluginGameOver,
             widgets::PluginGetReady,
+            widgets::PluginGameHud,
             RapierPhysicsPlugin::<NoUserData>::pixels_per_meter(10.0),
-            RapierDebugRenderPlugin::default(),
         ))
         .insert_resource(ClearColor(BACKGROUND_COLOR))
         .insert_resource(WorldSize::default())
         .insert_resource(Lives(3))
         .register_type::<Lives>()
         .insert_resource(Score(0))
+        .register_type::<Score>()
         .insert_resource(AsteroidSpawner::new())
         .init_resource::<GameAssets>()
         .add_systems(Startup, spawn_camera)
-        .add_systems(
-            OnEnter(GameState::Playing),
-            (objects::spawn_player, widgets::spawn_ui),
-        )
+        .add_systems(OnEnter(GameState::Playing), objects::spawn_player)
+        .add_systems(OnExit(GameState::Playing), despawn::<Ship>)
         .add_systems(
             FixedUpdate,
             (
@@ -60,12 +58,14 @@ impl Plugin for AsteroidPlugin {
                 input_ship_shoot,
                 physics::wrap_entities,
                 machinery::tick_asteroid_manager,
+                machinery::operate_sparklers,
                 objects::spawn_asteroid.after(machinery::tick_asteroid_manager),
                 objects::split_asteroids,
                 objects::bullet_impact_listener,
                 objects::ship_impact_listener,
                 physics::collision_listener,
                 machinery::tick_lifetimes,
+                machinery::update_scoreboard,
             )
                 .run_if(in_state(GameState::Playing)),
         )
@@ -77,14 +77,22 @@ impl Plugin for AsteroidPlugin {
             )
                 .run_if(in_state(GameState::Playing)),
         )
-        .add_event::<events::SpawnAsteroid>()
-        .add_event::<events::AsteroidDestroy>()
-        .add_event::<events::ShipDestroy>()
-        .add_event::<events::BulletDestroy>();
+        .add_message::<messages::SpawnAsteroid>()
+        .add_message::<messages::AsteroidDestroy>()
+        .add_message::<messages::ShipDestroy>()
+        .add_message::<messages::BulletDestroy>();
         app.insert_state(GameState::TitleScreen);
     }
 }
 
+/// Despawns entities matching the generic argument. Intended to remove UI
+/// elements.
+pub(crate) fn despawn<T: Component>(mut commands: Commands, to_despawn: Query<Entity, With<T>>) {
+    for entity in to_despawn {
+        commands.entity(entity).despawn();
+    }
+}
+
 /// The game's main state tracking mechanism, registered with Bevy as a [`State`](`bevy::prelude::State`).
 #[derive(Clone, Debug, Eq, Hash, PartialEq, States)]
 pub enum GameState {
@@ -103,14 +111,28 @@ fn spawn_camera(mut commands: Commands) {
 /// Checks if "W" is pressed and increases velocity accordingly.
 fn input_ship_thruster(
     keyboard_input: Res<ButtonInput<KeyCode>>,
-    mut query: Query<(&mut physics::Velocity, &Transform, &mut Children), With<Ship>>,
+    mut query: Query<
+        (
+            &mut physics::Velocity,
+            &Transform,
+            Option<&mut AudioSink>,
+            &mut Children,
+        ),
+        With<Ship>,
+    >,
     mut commands: Commands,
     game_assets: Res<GameAssets>,
 ) {
     // TODO: Maybe change for a Single<Ship>> so this only runs for the one ship
     // buuut... that would silently do nothing if there are 0 or >1 ships, and
     // I might want to crash on purpose in that case.
-    let Ok((mut velocity, transform, children)) = query.single_mut() else {
+    //
+    // The AudioSink component doesn't exist for just one frame, forcing it to
+    // be an optional system parameter. I'm not sure if I want to guard it with
+    // a check like it does now, or finally switch to using a Single<...> query
+    // parameter. I would lose ship control if the sound sink didn't spawn, but
+    // that should be fine -- any time that fails, more has likely also failed.
+    let Ok((mut velocity, transform, audio, children)) = query.single_mut() else {
         let count = query.iter().count();
         panic!("There should be exactly one player ship! Instead, there seems to be {count}.");
     };
@@ -124,10 +146,16 @@ fn input_ship_thruster(
         commands
             .entity(*thrusters)
             .insert(MeshMaterial2d(game_assets.thruster_mat_active()));
+        if let Some(audio) = audio {
+            audio.play();
+        }
     } else {
         commands
             .entity(*thrusters)
             .insert(MeshMaterial2d(game_assets.thruster_mat_inactive()));
+        if let Some(audio) = audio {
+            audio.pause();
+        }
     }
 }
 
@@ -161,19 +189,25 @@ fn input_ship_rotation(
 /// tick those timers. Maybe this system?
 fn input_ship_shoot(
     keyboard_input: Res<ButtonInput<KeyCode>>,
-    ship: Single<(&Transform, &physics::Velocity), With<Ship>>,
+    ship: Single<(&Transform, &physics::Velocity, &mut Weapon), With<Ship>>,
     game_assets: Res<GameAssets>,
     mut commands: Commands,
+    time: Res<Time>,
 ) {
-    let (ship_pos, ship_vel) = *ship;
+    let (ship_pos, ship_vel, mut weapon) = ship.into_inner();
 
+    // Tick the timer so the cooldown eventually finishes. Once it does, the
+    // value will clamp at 0. The weapon is now ready.
+    weapon.tick(time.delta());
+
+    // If the weapon is ready and the player presses the trigger,
+    // spawn a bullet & reset the timer.
+    if weapon.is_finished() && keyboard_input.pressed(KeyCode::Space) {
+        weapon.reset();
         // Derive bullet velocity, add to the ship's velocity
         let bullet_vel = (ship_pos.rotation * Vec3::X).xy() * BULLET_SPEED;
         let bullet_vel = bullet_vel + ship_vel.0;
 
-    // TODO: create a timer for the gun fire rate.
-    // For now, spawn one for each press of the spacebar.
-    if keyboard_input.just_pressed(KeyCode::Space) {
         commands.spawn((
             Bullet,
             Collider::ball(0.2),
@@ -185,6 +219,8 @@ fn input_ship_shoot(
             MeshMaterial2d(game_assets.bullet().1),
             ship_pos.clone(), // clone ship transform
             Lifetime(Timer::from_seconds(BULLET_LIFETIME, TimerMode::Once)),
+            AudioPlayer::new(game_assets.laser_sound()),
+            PlaybackSettings::ONCE, // `Lifetime` already despawns the entity, so this doesn't need to
         ));
     }
 }

src/machinery.rs

@@ -8,7 +8,12 @@ use std::time::Duration;
 
 use bevy::prelude::*;
 
-use crate::{WorldSize, events::SpawnAsteroid, objects::AsteroidSize};
+use crate::{
+    WorldSize,
+    messages::{AsteroidDestroy, SpawnAsteroid},
+    objects::AsteroidSize,
+    resources::Score,
+};
 
 /// Asteroid spawning parameters and state.
 ///
@@ -38,7 +43,7 @@ impl AsteroidSpawner {
 /// Update the asteroid spawn timer in the [`AsteroidSpawner`] resource, and
 /// spawns any asteroids that are due this frame.
 pub fn tick_asteroid_manager(
-    mut events: EventWriter<SpawnAsteroid>,
+    mut events: MessageWriter<SpawnAsteroid>,
     mut spawner: ResMut<AsteroidSpawner>,
     time: Res<Time>,
     play_area: Res<WorldSize>,
@@ -103,3 +108,47 @@ pub fn tick_lifetimes(
         }
     }
 }
+
+/// Entities marked with this will flash. Used to make the debris field sparkle.
+#[derive(Component, Deref, DerefMut)]
+pub struct Sparkler(Timer);
+
+impl Sparkler {
+    pub fn at_interval(period: f32) -> Self {
+        Self(Timer::from_seconds(period, TimerMode::Repeating))
+    }
+}
+
+/// Advances the timer in a sparkler, swapping between visible and invisible
+/// each time the timer expires.
+pub fn operate_sparklers(sparklers: Query<(&mut Visibility, &mut Sparkler)>, time: Res<Time>) {
+    for (mut vis, mut timer) in sparklers {
+        if timer.tick(time.delta()).just_finished() {
+            // Cycle between visible and in-visible modes (and print warning for "Inherited")
+            *vis = match *vis {
+                Visibility::Inherited => {
+                    // I don't know when entities have this mode, so I'm going
+                    // print a warning for a while.
+                    eprintln!(
+                        "->> WARN: `machinery::operate_sparklers` found an entity with Visibility::Inherited"
+                    );
+                    Visibility::Inherited
+                }
+                Visibility::Hidden => Visibility::Visible,
+                Visibility::Visible => Visibility::Hidden,
+            };
+        }
+    }
+}
+
+/// Event listener for adding score after an asteroid was destroyed
+///
+/// Refreshing the HUD element is done by [crate::widgets::operate_ui] (a private function)
+pub fn update_scoreboard(
+    mut destroy_events: MessageReader<AsteroidDestroy>,
+    mut scoreboard: ResMut<Score>,
+) {
+    for _event in destroy_events.read() {
+        scoreboard.0 += 100;
+    }
+}

src/main.rs

@@ -7,7 +7,8 @@ fn main() {
     App::new()
         .add_plugins(DefaultPlugins.set(WindowPlugin {
             primary_window: Some(Window {
-                resolution: WindowResolution::new(WINDOW_SIZE.x, WINDOW_SIZE.y),
+                canvas: Some("#game-canvas".to_owned()),
+                resolution: WindowResolution::new(WINDOW_SIZE.0, WINDOW_SIZE.1),
                 ..default()
             }),
             ..default()

src/messages.rs

@@ -6,15 +6,15 @@ use crate::objects::AsteroidSize;
 ///
 /// Produced by the [`fn collision_listener(...)`](`crate::physics::collision_listener`)
 /// system when the player collides with an asteroid. They are consumed by [`fn ship_impact_listener(...)`](`crate::objects::ship_impact_listener`).
-#[derive(Event)]
+#[derive(Message)]
 pub(crate) struct ShipDestroy;
 
 /// Signals that a particular asteroid has been destroyed.
 ///
 /// Produced by the [`fn collision_listener(...)`](`crate::physics::collision_listener`)
 /// system when bullets contact asteroids. It is consumed by [`fn split_asteroid(...)`](`crate::objects::spawn_asteroid`)
-/// system, which re-emits [spawn events](`SpawnAsteroid`).
-#[derive(Event)]
+/// system, which re-emits [spawn messages](`SpawnAsteroid`).
+#[derive(Message)]
 pub(crate) struct AsteroidDestroy(pub Entity);
 
 /// Signals that an asteroid needs to be spawned and provides the parameters
@@ -22,7 +22,7 @@ pub(crate) struct AsteroidDestroy(pub Entity);
 ///
 /// Produced by the [`tick_asteroid_manager(...)`](`crate::machinery::tick_asteroid_manager`)
 /// system and consumed by the [`spawn_asteroid(...)`](`crate::objects::spawn_asteroid`) system.
-#[derive(Event)]
+#[derive(Message)]
 pub struct SpawnAsteroid {
     pub pos: Vec2,
     pub vel: Vec2,
@@ -32,5 +32,5 @@ pub struct SpawnAsteroid {
 /// Signals that a particular bullet has been destroyed (after it strikes an Asteroid).
 ///
 /// TODO: Maybe use it for lifetime expiration (which is also a TODO item).
-#[derive(Event)]
+#[derive(Message)]
 pub(crate) struct BulletDestroy(pub Entity);

src/objects.rs

@@ -3,17 +3,19 @@
 //! Asteroids, the player's ship, and such.
 
 use bevy::{
+    audio::{AudioPlayer, PlaybackSettings},
+    camera::visibility::Visibility,
     ecs::{
         component::Component,
         entity::Entity,
-        event::{EventReader, EventWriter},
+        message::{MessageReader, MessageWriter},
         query::With,
         system::{Commands, Query, Res, ResMut, Single},
     },
     math::{Vec2, Vec3, Vec3Swizzles},
+    mesh::Mesh2d,
     prelude::{Deref, DerefMut},
-    render::mesh::Mesh2d,
-    sprite::MeshMaterial2d,
+    sprite_render::MeshMaterial2d,
     state::state::NextState,
     time::{Timer, TimerMode},
     transform::components::Transform,
@@ -22,9 +24,9 @@ use bevy_rapier2d::prelude::{ActiveCollisionTypes, ActiveEvents, Collider, Senso
 
 use crate::{
     AngularVelocity, GameAssets, GameState, Lives,
-    config::ASTEROID_LIFETIME,
-    events::{AsteroidDestroy, BulletDestroy, ShipDestroy, SpawnAsteroid},
-    machinery::Lifetime,
+    config::{ASTEROID_LIFETIME, DEBRIS_LIFETIME, SHIP_FIRE_RATE},
+    machinery::{Lifetime, Sparkler},
+    messages::{AsteroidDestroy, BulletDestroy, ShipDestroy, SpawnAsteroid},
     physics::{Velocity, Wrapping},
 };
 
@@ -55,13 +57,21 @@ impl AsteroidSize {
 #[derive(Component)]
 pub struct Ship;
 
+/// The ship's gun (is just a timer)
+#[derive(Component, Deref, DerefMut)]
+pub struct Weapon(Timer);
+
 /// Marker component for bullets.
 #[derive(Component)]
 pub struct Bullet;
 
+/// Debris left behind after the ship is destroyed.
+#[derive(Component)]
+pub struct Debris;
+
 /// Responds to [`SpawnAsteroid`] events, spawning as specified
 pub fn spawn_asteroid(
-    mut events: EventReader<SpawnAsteroid>,
+    mut events: MessageReader<SpawnAsteroid>,
     mut commands: Commands,
     game_assets: Res<GameAssets>,
 ) {
@@ -73,9 +83,9 @@ pub fn spawn_asteroid(
         };
 
         let collider_radius = match spawn.size {
-            AsteroidSize::Small => 10.0,
-            AsteroidSize::Medium => 20.0,
-            AsteroidSize::Large => 40.0,
+            AsteroidSize::Small => 5.0,
+            AsteroidSize::Medium => 10.0,
+            AsteroidSize::Large => 20.0,
         };
 
         commands.spawn((
@@ -101,10 +111,11 @@ pub fn spawn_asteroid(
 /// The velocity of the child asteroids is scattered somewhat, as if they were
 /// explosively pushed apart.
 pub fn split_asteroids(
-    mut destroy_events: EventReader<AsteroidDestroy>,
-    mut respawn_events: EventWriter<SpawnAsteroid>,
+    mut destroy_events: MessageReader<AsteroidDestroy>,
+    mut respawn_events: MessageWriter<SpawnAsteroid>,
     mut commands: Commands,
     query: Query<(&Transform, &Asteroid, &Velocity)>,
+    game_assets: Res<GameAssets>,
 ) {
     for event in destroy_events.read() {
         if let Ok((transform, rock, velocity)) = query.get(event.0) {
@@ -127,6 +138,12 @@ pub fn split_asteroids(
             // Always despawn the asteroid. New ones (may) be spawned in it's
             // place, but this one is gone.
             commands.entity(event.0).despawn();
+
+            // Play a sound for the asteroid exploding
+            commands.spawn((
+                AudioPlayer::new(game_assets.asteroid_crack_sound()),
+                PlaybackSettings::DESPAWN,
+            ));
         }
     }
 }
@@ -144,12 +161,19 @@ pub fn spawn_player(mut commands: Commands, game_assets: Res<GameAssets>) {
             ActiveEvents::COLLISION_EVENTS,
             ActiveCollisionTypes::STATIC_STATIC,
             Ship,
+            Weapon(Timer::from_seconds(1.0 / SHIP_FIRE_RATE, TimerMode::Once)),
             Wrapping,
             Velocity(Vec2::ZERO),
             AngularVelocity(0.0),
             Mesh2d(game_assets.ship().0),
             MeshMaterial2d(game_assets.ship().1),
             Transform::default().with_scale(Vec3::new(20.0, 20.0, 20.0)),
+            AudioPlayer::new(game_assets.ship_thruster_sound()),
+            PlaybackSettings {
+                mode: bevy::audio::PlaybackMode::Loop,
+                paused: true,
+                ..Default::default()
+            },
         ))
         .with_child((
             Mesh2d(game_assets.thruster_mesh()),
@@ -162,7 +186,7 @@ pub fn spawn_player(mut commands: Commands, game_assets: Res<GameAssets>) {
 
 /// Watch for [`BulletDestroy`] events and despawn
 /// the associated bullet.
-pub fn bullet_impact_listener(mut commands: Commands, mut events: EventReader<BulletDestroy>) {
+pub fn bullet_impact_listener(mut commands: Commands, mut events: MessageReader<BulletDestroy>) {
     for event in events.read() {
         commands.entity(event.0).despawn();
     }
@@ -178,30 +202,55 @@ pub fn bullet_impact_listener(mut commands: Commands, mut events: EventReader<Bu
 /// - Clear all asteroids
 /// - Respawn player
 pub fn ship_impact_listener(
-    mut events: EventReader<ShipDestroy>,
+    mut events: MessageReader<ShipDestroy>,
     mut commands: Commands,
     mut lives: ResMut<Lives>,
     rocks: Query<Entity, With<Asteroid>>,
     mut player: Single<(&mut Transform, &mut Velocity), With<Ship>>,
     mut next_state: ResMut<NextState<GameState>>,
+    game_assets: Res<GameAssets>,
 ) {
     for _ in events.read() {
-        // STEP 1: Decrement lives (and maybe go to game over)
+        // STEP 1: Clear asteroids
+        for rock in rocks {
+            commands.entity(rock).despawn();
+        }
+
+        // STEP 2: Decrement lives
         if lives.0 == 0 {
-            // If already at 0, game is over.
+            // If the player has run out, return early with a state change.
             next_state.set(GameState::GameOver);
+            return;
         } else {
             // Decrease life count.
             lives.0 -= 1;
         }
 
-        // STEP 2: Clear asteroids
-        for rock in rocks {
-            commands.entity(rock).despawn();
+        // STEP 3: spawn the debris field where the player used to be.
+        for i in 0..10 {
+            let angle_rads = (i as f32) / 10.0 * std::f32::consts::TAU;
+            let dir = Vec2::from_angle(angle_rads);
+            let vel = player.1.0 + dir * 100.0;
+            commands.spawn((
+                Debris,
+                Visibility::Visible, // make sure it's "visible" not "Inherited" so the cycle works right
+                Lifetime(Timer::from_seconds(DEBRIS_LIFETIME, TimerMode::Once)),
+                Sparkler::at_interval(0.15),
+                Mesh2d(game_assets.thruster_mesh()), // borrow the thruster mesh for now
+                MeshMaterial2d(game_assets.thruster_mat_active()), // ... and the active thruster material
+                player.0.clone(),                                  // clone the player transform
+                Velocity(vel),
+            ));
         }
 
-        // STEP 3: Respawn player (teleport them to the origin)
+        // STEP 4: Respawn player (teleport them to the origin)
         player.0.translation = Vec3::ZERO;
         player.1.0 = Vec2::ZERO;
+
+        // STEP 5: Play crash sound
+        commands.spawn((
+            AudioPlayer::new(game_assets.wreck_sound()),
+            PlaybackSettings::DESPAWN, // despawn this entity when playback ends.
+        ));
     }
 }

src/physics.rs

@@ -16,7 +16,7 @@
 //! to detect them for me (so that I don't have to write clipping code).
 
 use crate::{
-    WorldSize, events,
+    WorldSize, messages,
     objects::{Asteroid, Bullet, Ship},
 };
 
@@ -89,10 +89,10 @@ pub(crate) fn wrap_entities(
 /// | Bullet & Bullet | Nothing. Bullets won't collide with each other (and probably can't under normal gameplay conditions) |
 /// | Bullet & Ship | Nothing. The player shouldn't be able to shoot themselves (and the Flying Saucer hasn't been impl.'d, so it's bullets don't count) |
 pub fn collision_listener(
-    mut collisions: EventReader<CollisionEvent>,
-    mut ship_writer: EventWriter<events::ShipDestroy>,
-    mut asteroid_writer: EventWriter<events::AsteroidDestroy>,
-    mut bullet_writer: EventWriter<events::BulletDestroy>,
+    mut collisions: MessageReader<CollisionEvent>,
+    mut ship_writer: MessageWriter<messages::ShipDestroy>,
+    mut asteroid_writer: MessageWriter<messages::AsteroidDestroy>,
+    mut bullet_writer: MessageWriter<messages::BulletDestroy>,
     player: Single<Entity, With<Ship>>,
     bullets: Query<&Bullet>,
     rocks: Query<&Asteroid>,
@@ -112,12 +112,12 @@ pub fn collision_listener(
                 if rocks.contains(*two) {
                     // player-asteroid collision
                     dbg!("Writing ShipDestroy event");
-                    ship_writer.write(events::ShipDestroy);
+                    ship_writer.write(messages::ShipDestroy);
                 } // else, we don't care
             } else if *two == *player {
                 if rocks.contains(*one) {
                     dbg!("Writing ShipDestroy event");
-                    ship_writer.write(events::ShipDestroy);
+                    ship_writer.write(messages::ShipDestroy);
                 }
             }
 
@@ -125,14 +125,14 @@ pub fn collision_listener(
             if bullets.contains(*one) {
                 if rocks.contains(*two) {
                     dbg!("Writing AsteroidDestroy & BulletDestroy events");
-                    asteroid_writer.write(events::AsteroidDestroy(*two));
-                    bullet_writer.write(events::BulletDestroy(*one));
+                    asteroid_writer.write(messages::AsteroidDestroy(*two));
+                    bullet_writer.write(messages::BulletDestroy(*one));
                 }
             } else if rocks.contains(*one) {
                 if bullets.contains(*two) {
                     dbg!("Writing AsteroidDestroy & BulletDestroy events");
-                    asteroid_writer.write(events::AsteroidDestroy(*one));
-                    bullet_writer.write(events::BulletDestroy(*two));
+                    asteroid_writer.write(messages::AsteroidDestroy(*one));
+                    bullet_writer.write(messages::BulletDestroy(*two));
                 }
             }
         }

src/resources.rs

@@ -1,28 +1,31 @@
 //! All the resources for the game
 
 use bevy::{
-    asset::{Assets, Handle},
+    asset::{AssetServer, Assets, Handle},
+    audio::AudioSource,
     ecs::{
         resource::Resource,
         world::{FromWorld, World},
     },
     math::{
         Vec2,
-        primitives::{Circle, Triangle2d},
+        primitives::{Polyline2d, Segment2d, Triangle2d},
     },
+    mesh::Mesh,
     prelude::{Deref, DerefMut, Reflect, ReflectResource},
-    render::mesh::Mesh,
-    sprite::ColorMaterial,
+    sprite_render::ColorMaterial,
 };
 use bevy_inspector_egui::InspectorOptions;
 use bevy_inspector_egui::inspector_options::ReflectInspectorOptions;
 
 use crate::{
-    ASTEROID_SMALL_COLOR, BULLET_COLOR, PLAYER_SHIP_COLOR, SHIP_THRUSTER_COLOR_ACTIVE,
-    SHIP_THRUSTER_COLOR_INACTIVE, config::WINDOW_SIZE,
+    ASTEROID_LARGE_COLOR, ASTEROID_MEDIUM_COLOR, ASTEROID_SMALL_COLOR, BULLET_COLOR,
+    PLAYER_SHIP_COLOR, SHIP_THRUSTER_COLOR_ACTIVE, SHIP_THRUSTER_COLOR_INACTIVE,
+    config::WINDOW_SIZE,
 };
 
-#[derive(Resource, Debug, Deref, Clone, Copy)]
+#[derive(InspectorOptions, Reflect, Resource, Debug, Deref, Clone, Copy)]
+#[reflect(Resource, InspectorOptions)]
 pub struct Score(pub i32);
 
 impl From<Score> for String {
@@ -41,12 +44,14 @@ impl From<Lives> for String {
     }
 }
 
+// TODO: consider switching this to use a u32 pair like the Window settings
+// thing now does.
 #[derive(Deref, DerefMut, Resource)]
 pub struct WorldSize(Vec2);
 
 impl Default for WorldSize {
     fn default() -> Self {
-        WorldSize(Vec2::new(WINDOW_SIZE.x, WINDOW_SIZE.y))
+        WorldSize(Vec2::new(WINDOW_SIZE.0 as f32, WINDOW_SIZE.1 as f32))
     }
 }
 
@@ -54,6 +59,7 @@ impl Default for WorldSize {
 pub struct GameAssets {
     meshes: [Handle<Mesh>; 5],
     materials: [Handle<ColorMaterial>; 7],
+    sounds: [Handle<AudioSource>; 4],
 }
 
 impl GameAssets {
@@ -78,20 +84,36 @@ impl GameAssets {
     }
 
     pub fn asteroid_small(&self) -> (Handle<Mesh>, Handle<ColorMaterial>) {
-        (self.meshes[1].clone(), self.materials[1].clone())
+        (self.meshes[1].clone(), self.materials[3].clone())
     }
 
     pub fn asteroid_medium(&self) -> (Handle<Mesh>, Handle<ColorMaterial>) {
-        (self.meshes[2].clone(), self.materials[2].clone())
+        (self.meshes[2].clone(), self.materials[4].clone())
     }
 
     pub fn asteroid_large(&self) -> (Handle<Mesh>, Handle<ColorMaterial>) {
-        (self.meshes[3].clone(), self.materials[3].clone())
+        (self.meshes[3].clone(), self.materials[5].clone())
     }
 
     pub fn bullet(&self) -> (Handle<Mesh>, Handle<ColorMaterial>) {
         (self.meshes[4].clone(), self.materials[6].clone())
     }
+
+    pub fn wreck_sound(&self) -> Handle<AudioSource> {
+        self.sounds[0].clone()
+    }
+
+    pub fn laser_sound(&self) -> Handle<AudioSource> {
+        self.sounds[1].clone()
+    }
+
+    pub fn asteroid_crack_sound(&self) -> Handle<AudioSource> {
+        self.sounds[2].clone()
+    }
+
+    pub fn ship_thruster_sound(&self) -> Handle<AudioSource> {
+        self.sounds[3].clone()
+    }
 }
 
 impl FromWorld for GameAssets {
@@ -103,10 +125,63 @@ impl FromWorld for GameAssets {
                 Vec2::new(-0.5, 0.45),
                 Vec2::new(-0.5, -0.45),
             )),
-            world_meshes.add(Circle::new(10.0)),
-            world_meshes.add(Circle::new(20.0)),
-            world_meshes.add(Circle::new(40.0)),
-            world_meshes.add(Circle::new(0.2)),
+            world_meshes.add(Polyline2d::new(
+                [
+                    Vec2::new(0.1, 0.0),
+                    Vec2::new(0.8, 0.2),
+                    Vec2::new(0.8, 0.3),
+                    Vec2::new(0.1, 1.0),
+                    Vec2::new(-0.5, 1.0),
+                    Vec2::new(-0.3, 0.3),
+                    Vec2::new(-1.0, 0.3),
+                    Vec2::new(-1.0, -0.2),
+                    Vec2::new(-0.5, -1.0),
+                    Vec2::new(0.1, -0.8),
+                    Vec2::new(0.5, -0.9),
+                    Vec2::new(1.0, -0.4),
+                    Vec2::new(0.1, 0.0),
+                ]
+                .into_iter()
+                .map(|vert| vert * 5.0),
+            )),
+            world_meshes.add(Polyline2d::new(
+                [
+                    Vec2::new(0.6, 0.3),
+                    Vec2::new(1.0, 0.6),
+                    Vec2::new(0.6, 1.0),
+                    Vec2::new(0.1, 0.8),
+                    Vec2::new(-0.4, 1.0),
+                    Vec2::new(-1.0, 0.6),
+                    Vec2::new(-0.8, -0.1),
+                    Vec2::new(-1.0, -0.5),
+                    Vec2::new(-0.4, -1.0),
+                    Vec2::new(-0.3, -0.7),
+                    Vec2::new(0.6, -1.0),
+                    Vec2::new(1.0, -0.3),
+                    Vec2::new(0.6, 0.3),
+                ]
+                .into_iter()
+                .map(|vert| vert * 10.0),
+            )),
+            world_meshes.add(Polyline2d::new(
+                [
+                    Vec2::new(1.0, -0.1),
+                    Vec2::new(1.0, 0.3),
+                    Vec2::new(0.4, 1.0),
+                    Vec2::new(-0.2, 1.0),
+                    Vec2::new(-0.9, 0.3),
+                    Vec2::new(-0.5, 0.1),
+                    Vec2::new(-0.9, -0.1),
+                    Vec2::new(-0.5, -1.0),
+                    Vec2::new(0.0, 0.0),
+                    Vec2::new(0.0, -1.0),
+                    Vec2::new(0.5, -1.0),
+                    Vec2::new(1.0, -0.1),
+                ]
+                .into_iter()
+                .map(|vert| vert * 20.0),
+            )),
+            world_meshes.add(Segment2d::new(Vec2::new(-0.1, 0.0), Vec2::new(0.1, 0.0))),
         ];
         let mut world_materials = world.resource_mut::<Assets<ColorMaterial>>();
         let materials = [
@@ -115,10 +190,21 @@ impl FromWorld for GameAssets {
             world_materials.add(SHIP_THRUSTER_COLOR_ACTIVE),
             world_materials.add(ASTEROID_SMALL_COLOR),
             // TODO: asteroid medium and large colors
-            world_materials.add(ASTEROID_SMALL_COLOR),
-            world_materials.add(ASTEROID_SMALL_COLOR),
+            world_materials.add(ASTEROID_MEDIUM_COLOR),
+            world_materials.add(ASTEROID_LARGE_COLOR),
             world_materials.add(BULLET_COLOR),
         ];
-        GameAssets { meshes, materials }
+        let loader = world.resource_mut::<AssetServer>();
+        let sounds = [
+            loader.load("explosionCrunch_004.ogg"),
+            loader.load("laserSmall_001.ogg"),
+            loader.load("explosionCrunch_000.ogg"),
+            loader.load("thrusterFire_004.ogg"),
+        ];
+        GameAssets {
+            meshes,
+            materials,
+            sounds,
+        }
     }
 }

src/widgets.rs

@@ -1,6 +1,9 @@
+use std::ops::DerefMut;
+
 use crate::{
     GameState,
     config::{UI_BUTTON_HOVERED, UI_BUTTON_NORMAL, UI_BUTTON_PRESSED},
+    despawn,
     resources::{Lives, Score},
 };
 
@@ -38,6 +41,17 @@ impl Plugin for PluginGetReady {
     }
 }
 
+/// Plugin for the in-game HUD
+pub struct PluginGameHud;
+
+impl Plugin for PluginGameHud {
+    fn build(&self, app: &mut App) {
+        app.add_systems(OnEnter(GameState::Playing), spawn_ui)
+            .add_systems(OnExit(GameState::Playing), despawn::<MarkerHUD>)
+            .add_systems(Update, (operate_ui).run_if(in_state(GameState::Playing)));
+    }
+}
+
 /// Plugin for the game-over screen
 pub struct PluginGameOver;
 
@@ -65,10 +79,18 @@ struct OnReadySetGo;
 #[derive(Component)]
 struct MarkerGameOver;
 
-/// Action specifier for the game-over menu's buttons.
+/// Marker for things on the HUD (the in-game UI elements)
+#[derive(Component)]
+struct MarkerHUD;
+
+/// Action specifier for the buttons on the menus.
 ///
-/// Attach this component to a button and [`PluginGameOver`] will use it to
-/// decide what to do when that button is pressed.
+/// Instead of holding function pointers for use as callbacks, I'm doing enum-
+/// dispatch. Add a variant according to what action the button press should
+/// trigger.
+///
+/// Only [`PluginGameMenu`] and [`PluginGameOver`] will use it to this
+/// component. There is no always-on, global system.
 #[derive(Component)]
 enum ButtonMenuAction {
     ToMainMenu,
@@ -88,14 +110,6 @@ struct CountdownText;
 #[derive(Component)]
 struct CountdownBar;
 
-/// Despawns entities matching the generic argument. Intended to remove UI
-/// elements.
-fn despawn<T: Component>(mut commands: Commands, to_despawn: Query<Entity, With<T>>) {
-    for entity in to_despawn {
-        commands.entity(entity).despawn();
-    }
-}
-
 /// Utility function for creating a standard button.
 fn button_bundle(text: &str) -> impl Bundle {
     (
@@ -110,7 +124,7 @@ fn button_bundle(text: &str) -> impl Bundle {
             margin: UiRect::all(Val::Px(5.0)),
             ..default()
         },
-        BorderColor(Color::BLACK),
+        BorderColor::all(Color::BLACK),
         BorderRadius::MAX,
         BackgroundColor(UI_BUTTON_NORMAL),
         children![(
@@ -138,7 +152,7 @@ fn spawn_menu(mut commands: Commands) {
             cmds.spawn((
                 Text::new("Robert's Bad Asteroids Game"),
                 TextFont::from_font_size(50.0),
-                TextLayout::new_with_justify(JustifyText::Center),
+                TextLayout::new_with_justify(Justify::Center),
                 TextShadow::default(),
             ));
             cmds.spawn((
@@ -152,7 +166,8 @@ fn spawn_menu(mut commands: Commands) {
         });
 }
 
-fn spawn_get_ready(mut commands: Commands) {
+fn spawn_get_ready(mut commands: Commands, mut timer: ResMut<ReadySetGoTimer>) {
+    timer.reset();
     commands.spawn((
         OnReadySetGo, // marker, so this can be de-spawned properly
         Node {
@@ -201,6 +216,11 @@ fn spawn_gameover_ui(mut commands: Commands) {
             ..default()
         },
         children![
+            (
+                Text::new("Game Over"),
+                TextFont::from_font_size(35.0),
+                TextShadow::default(),
+            ),
             (button_bundle("Main Menu"), ButtonMenuAction::ToMainMenu,),
             (button_bundle("Quit"), ButtonMenuAction::Quit),
         ],
@@ -227,7 +247,7 @@ fn animate_get_ready_widget(
     bar_segment.width = Val::Percent(100.0 * (1.0 - timer.fraction()));
 
     // If the timer has expired, change state to playing.
-    if timer.finished() {
+    if timer.is_finished() {
         game_state.set(GameState::Playing);
     }
 }
@@ -254,20 +274,20 @@ fn operate_buttons(
         (Changed<Interaction>, With<Button>),
     >,
     mut game_state: ResMut<NextState<GameState>>,
-    mut app_exit_events: EventWriter<AppExit>,
+    mut app_exit_events: MessageWriter<AppExit>,
 ) {
     // TODO: Better colors. These are taken from the example and they're ugly.
     for (interaction, mut color, mut border_color, menu_action) in &mut interactions {
         match *interaction {
             Interaction::Pressed => {
                 *color = UI_BUTTON_PRESSED.into();
-                border_color.0 = DARK_GRAY.into();
+                border_color.set_all(DARK_GRAY);
                 match menu_action {
                     ButtonMenuAction::ToMainMenu => {
                         game_state.set(GameState::TitleScreen);
                     }
                     ButtonMenuAction::StartGame => {
-                        game_state.set(GameState::Playing);
+                        game_state.set(GameState::GetReady);
                     }
                     ButtonMenuAction::Quit => {
                         app_exit_events.write(AppExit::Success);
@@ -276,11 +296,11 @@ fn operate_buttons(
             }
             Interaction::Hovered => {
                 *color = UI_BUTTON_HOVERED.into();
-                border_color.0 = WHITE.into();
+                border_color.set_all(WHITE);
             }
             Interaction::None => {
                 *color = UI_BUTTON_NORMAL.into();
-                border_color.0 = BLACK.into();
+                border_color.set_all(BLACK);
             }
         }
     }
@@ -294,8 +314,50 @@ fn handle_spacebar(input: Res<ButtonInput<KeyCode>>, mut game_state: ResMut<Next
 }
 
 pub fn spawn_ui(mut commands: Commands, score: Res<Score>, lives: Res<Lives>) {
+    let score = score.0;
+    let lives = lives.0;
     commands.spawn((
-        Text::new(format!("Score: {score:?} | Lives: {lives:?}")),
+        MarkerHUD,
+        Node {
+            width: Val::Percent(100.0),
+            height: Val::Percent(100.0),
+            align_items: AlignItems::Start,
+            justify_content: JustifyContent::SpaceBetween,
+            padding: UiRect::all(Val::Px(5.0)),
+            ..default()
+        },
+        children![
+            (
+                Text::new(format!("Score: {score}")),
                 TextFont::from_font_size(25.0),
+                TextShadow::default(),
+            ),
+            (
+                Text::new(format!("Lives: {lives}")),
+                TextFont::from_font_size(25.0),
+                TextShadow::default(),
+            )
+        ],
     ));
 }
+
+/// Updates the HUD with the current score & life count
+///
+/// TODO: some kind of event-based thing. Touching the text nodes every frame
+/// seems expensive.
+fn operate_ui(
+    mut query: Single<(&Node, &Children), With<MarkerHUD>>,
+    mut text_query: Query<&mut Text>,
+    lives: Res<Lives>,
+    score: Res<Score>,
+) {
+    let (_node, children) = query.deref_mut();
+    let score = score.0;
+    let lives = lives.0;
+    // TODO: Something smarter than `unwrap()`
+    let mut score_text = text_query.get_mut(children[0]).unwrap();
+    **score_text = format!("Score: {score}");
+
+    let mut lives_text = text_query.get_mut(children[1]).unwrap();
+    **lives_text = format!("Lives: {lives}");
+}

www/index.html

@@ -0,0 +1,113 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <style>
+       body {
+        background-color: hsl(200, 3%, 65%);
+      }
+      h1 {
+        color: hsl(200, 3%, 90%);
+        background-color: hsl(195, 5%, 17%);
+        text-align: center;
+        margin: auto;
+        padding: 0.5em;
+      }
+      canvas {
+        margin-top: 1em;
+        margin-left: auto;
+        margin-right: auto;
+        display: block;
+        outline-color: hsl(200, 7%, 50%);
+        outline-style: outset;
+        border-radius: 8px;
+        background-color: rgb(40%, 40%, 40%);
+      }
+      main {
+        margin-left: auto;
+        margin-right: auto;
+        width: 70%;
+      }
+      table {
+        margin-bottom: 10px;
+        border-collapse: collapse;
+      }
+      th, td {
+        border: 1px solid;
+        padding: 0.1em 0.3em;
+      }
+    </style>
+  </head>
+<body style="margin: 0px;">
+  <h1>
+    Robert's Bad Asteroids Game
+  </h1>
+  <canvas id="game-canvas" width="1280" height="720"></canvas>
+  <main>
+    <article>
+      <h2>Description</h2>
+      <p>
+        A (work in progress) version of the Asteroids arcade game.
+      </p>
+    </article>
+    <article>
+      <h3>Controls</h3>
+      <table>
+        <thead>
+          <tr>
+            <th scope="col">Input</th>
+            <th scope="col">Effect</th>
+          </tr>
+        </thead>
+        <tr>
+          <td>W</td>
+          <td>Fire thruster</td>
+        </tr>
+        <tr>
+          <td>A</td>
+          <td>Rotate Left</td>
+        </tr>
+        <tr>
+          <td>D</td>
+          <td>Rotate Right</td>
+        </tr>
+        <tr>
+          <td>Spacebar</td>
+          <td>Shoot gun</td>
+        </tr>
+      </table>
+    </article>
+    <article>
+      <h3>Misc</h3>
+      <table>
+        <tr>
+          <td>Source code</td>
+          <td><a href=https://github.com/DerVerrater/another-asteroids>https://github.com/DerVerrater/another-asteroids</a></td>
+        </tr>
+        <tr>
+          <td>License</td>
+          <td><a href="https://www.gnu.org/licenses/agpl-3.0.txt">AGPL-3.0-only</a></td>
+        </tr>
+        <tr>
+          <td>Program Version</td>
+          <!-- This version text is completely unchecked. I'll need to do something about that. -->
+          <td><code>v0.5.0</code></td>
+        </tr>
+      </table>
+    </article>
+  </main>
+  <script type="module">
+    import init from './asteroids.js'
+
+    let compressed = await fetch("./asteroids_bg.wasm.gz")
+    let wasm_stream = compressed.body.pipeThrough(new DecompressionStream("gzip"))
+    let blob = await new Response(wasm_stream).blob();
+
+    init(await blob.arrayBuffer()).catch((error) => {
+      if (!error.message.startsWith("Using exceptions for control flow, don't mind me. This isn't actually an error!")) {
+        throw error;
+      }
+    });
+  </script>
+</body>
+
+</html>