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alien_cake_addict.rs
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alien_cake_addict.rs
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//! Eat the cakes. Eat them all. An example 3D game.
use std::f32::consts::PI;
use bevy::prelude::*;
use rand::Rng;
#[derive(Clone, Eq, PartialEq, Debug, Hash, Default, States)]
enum GameState {
#[default]
Playing,
GameOver,
}
#[derive(Resource)]
struct BonusSpawnTimer(Timer);
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.init_resource::<Game>()
.insert_resource(BonusSpawnTimer(Timer::from_seconds(
5.0,
TimerMode::Repeating,
)))
.init_state::<GameState>()
.add_systems(Startup, setup_cameras)
.add_systems(OnEnter(GameState::Playing), setup)
.add_systems(
Update,
(
move_player,
focus_camera,
rotate_bonus,
scoreboard_system,
spawn_bonus,
)
.run_if(in_state(GameState::Playing)),
)
.add_systems(OnExit(GameState::Playing), teardown)
.add_systems(OnEnter(GameState::GameOver), display_score)
.add_systems(
Update,
(
gameover_keyboard.run_if(in_state(GameState::GameOver)),
bevy::window::close_on_esc,
),
)
.add_systems(OnExit(GameState::GameOver), teardown)
.run();
}
struct Cell {
height: f32,
}
#[derive(Default)]
struct Player {
entity: Option<Entity>,
i: usize,
j: usize,
move_cooldown: Timer,
}
#[derive(Default)]
struct Bonus {
entity: Option<Entity>,
i: usize,
j: usize,
handle: Handle<Scene>,
}
#[derive(Resource, Default)]
struct Game {
board: Vec<Vec<Cell>>,
player: Player,
bonus: Bonus,
score: i32,
cake_eaten: u32,
camera_should_focus: Vec3,
camera_is_focus: Vec3,
}
const BOARD_SIZE_I: usize = 14;
const BOARD_SIZE_J: usize = 21;
const RESET_FOCUS: [f32; 3] = [
BOARD_SIZE_I as f32 / 2.0,
0.0,
BOARD_SIZE_J as f32 / 2.0 - 0.5,
];
fn setup_cameras(mut commands: Commands, mut game: ResMut<Game>) {
game.camera_should_focus = Vec3::from(RESET_FOCUS);
game.camera_is_focus = game.camera_should_focus;
commands.spawn(Camera3dBundle {
transform: Transform::from_xyz(
-(BOARD_SIZE_I as f32 / 2.0),
2.0 * BOARD_SIZE_J as f32 / 3.0,
BOARD_SIZE_J as f32 / 2.0 - 0.5,
)
.looking_at(game.camera_is_focus, Vec3::Y),
..default()
});
}
fn setup(mut commands: Commands, asset_server: Res<AssetServer>, mut game: ResMut<Game>) {
// reset the game state
game.cake_eaten = 0;
game.score = 0;
game.player.i = BOARD_SIZE_I / 2;
game.player.j = BOARD_SIZE_J / 2;
game.player.move_cooldown = Timer::from_seconds(0.3, TimerMode::Once);
commands.spawn(PointLightBundle {
transform: Transform::from_xyz(4.0, 10.0, 4.0),
point_light: PointLight {
intensity: 2_000_000.0,
shadows_enabled: true,
range: 30.0,
..default()
},
..default()
});
// spawn the game board
let cell_scene = asset_server.load("models/AlienCake/tile.glb#Scene0");
game.board = (0..BOARD_SIZE_J)
.map(|j| {
(0..BOARD_SIZE_I)
.map(|i| {
let height = rand::thread_rng().gen_range(-0.1..0.1);
commands.spawn(SceneBundle {
transform: Transform::from_xyz(i as f32, height - 0.2, j as f32),
scene: cell_scene.clone(),
..default()
});
Cell { height }
})
.collect()
})
.collect();
// spawn the game character
game.player.entity = Some(
commands
.spawn(SceneBundle {
transform: Transform {
translation: Vec3::new(
game.player.i as f32,
game.board[game.player.j][game.player.i].height,
game.player.j as f32,
),
rotation: Quat::from_rotation_y(-PI / 2.),
..default()
},
scene: asset_server.load("models/AlienCake/alien.glb#Scene0"),
..default()
})
.id(),
);
// load the scene for the cake
game.bonus.handle = asset_server.load("models/AlienCake/cakeBirthday.glb#Scene0");
// scoreboard
commands.spawn(
TextBundle::from_section(
"Score:",
TextStyle {
font_size: 40.0,
color: Color::rgb(0.5, 0.5, 1.0),
..default()
},
)
.with_style(Style {
position_type: PositionType::Absolute,
top: Val::Px(5.0),
left: Val::Px(5.0),
..default()
}),
);
}
// remove all entities that are not a camera or window
fn teardown(mut commands: Commands, entities: Query<Entity, (Without<Camera>, Without<Window>)>) {
for entity in &entities {
commands.entity(entity).despawn();
}
}
// control the game character
fn move_player(
mut commands: Commands,
keyboard_input: Res<ButtonInput<KeyCode>>,
mut game: ResMut<Game>,
mut transforms: Query<&mut Transform>,
time: Res<Time>,
) {
if game.player.move_cooldown.tick(time.delta()).finished() {
let mut moved = false;
let mut rotation = 0.0;
if keyboard_input.pressed(KeyCode::ArrowUp) {
if game.player.i < BOARD_SIZE_I - 1 {
game.player.i += 1;
}
rotation = -PI / 2.;
moved = true;
}
if keyboard_input.pressed(KeyCode::ArrowDown) {
if game.player.i > 0 {
game.player.i -= 1;
}
rotation = PI / 2.;
moved = true;
}
if keyboard_input.pressed(KeyCode::ArrowRight) {
if game.player.j < BOARD_SIZE_J - 1 {
game.player.j += 1;
}
rotation = PI;
moved = true;
}
if keyboard_input.pressed(KeyCode::ArrowLeft) {
if game.player.j > 0 {
game.player.j -= 1;
}
rotation = 0.0;
moved = true;
}
// move on the board
if moved {
game.player.move_cooldown.reset();
*transforms.get_mut(game.player.entity.unwrap()).unwrap() = Transform {
translation: Vec3::new(
game.player.i as f32,
game.board[game.player.j][game.player.i].height,
game.player.j as f32,
),
rotation: Quat::from_rotation_y(rotation),
..default()
};
}
}
// eat the cake!
if let Some(entity) = game.bonus.entity {
if game.player.i == game.bonus.i && game.player.j == game.bonus.j {
game.score += 2;
game.cake_eaten += 1;
commands.entity(entity).despawn_recursive();
game.bonus.entity = None;
}
}
}
// change the focus of the camera
fn focus_camera(
time: Res<Time>,
mut game: ResMut<Game>,
mut transforms: ParamSet<(Query<&mut Transform, With<Camera3d>>, Query<&Transform>)>,
) {
const SPEED: f32 = 2.0;
// if there is both a player and a bonus, target the mid-point of them
if let (Some(player_entity), Some(bonus_entity)) = (game.player.entity, game.bonus.entity) {
let transform_query = transforms.p1();
if let (Ok(player_transform), Ok(bonus_transform)) = (
transform_query.get(player_entity),
transform_query.get(bonus_entity),
) {
game.camera_should_focus = player_transform
.translation
.lerp(bonus_transform.translation, 0.5);
}
// otherwise, if there is only a player, target the player
} else if let Some(player_entity) = game.player.entity {
if let Ok(player_transform) = transforms.p1().get(player_entity) {
game.camera_should_focus = player_transform.translation;
}
// otherwise, target the middle
} else {
game.camera_should_focus = Vec3::from(RESET_FOCUS);
}
// calculate the camera motion based on the difference between where the camera is looking
// and where it should be looking; the greater the distance, the faster the motion;
// smooth out the camera movement using the frame time
let mut camera_motion = game.camera_should_focus - game.camera_is_focus;
if camera_motion.length() > 0.2 {
camera_motion *= SPEED * time.delta_seconds();
// set the new camera's actual focus
game.camera_is_focus += camera_motion;
}
// look at that new camera's actual focus
for mut transform in transforms.p0().iter_mut() {
*transform = transform.looking_at(game.camera_is_focus, Vec3::Y);
}
}
// despawn the bonus if there is one, then spawn a new one at a random location
fn spawn_bonus(
time: Res<Time>,
mut timer: ResMut<BonusSpawnTimer>,
mut next_state: ResMut<NextState<GameState>>,
mut commands: Commands,
mut game: ResMut<Game>,
) {
// make sure we wait enough time before spawning the next cake
if !timer.0.tick(time.delta()).finished() {
return;
}
if let Some(entity) = game.bonus.entity {
game.score -= 3;
commands.entity(entity).despawn_recursive();
game.bonus.entity = None;
if game.score <= -5 {
next_state.set(GameState::GameOver);
return;
}
}
// ensure bonus doesn't spawn on the player
loop {
game.bonus.i = rand::thread_rng().gen_range(0..BOARD_SIZE_I);
game.bonus.j = rand::thread_rng().gen_range(0..BOARD_SIZE_J);
if game.bonus.i != game.player.i || game.bonus.j != game.player.j {
break;
}
}
game.bonus.entity = Some(
commands
.spawn(SceneBundle {
transform: Transform::from_xyz(
game.bonus.i as f32,
game.board[game.bonus.j][game.bonus.i].height + 0.2,
game.bonus.j as f32,
),
scene: game.bonus.handle.clone(),
..default()
})
.with_children(|children| {
children.spawn(PointLightBundle {
point_light: PointLight {
color: Color::rgb(1.0, 1.0, 0.0),
intensity: 500_000.0,
range: 10.0,
..default()
},
transform: Transform::from_xyz(0.0, 2.0, 0.0),
..default()
});
})
.id(),
);
}
// let the cake turn on itself
fn rotate_bonus(game: Res<Game>, time: Res<Time>, mut transforms: Query<&mut Transform>) {
if let Some(entity) = game.bonus.entity {
if let Ok(mut cake_transform) = transforms.get_mut(entity) {
cake_transform.rotate_y(time.delta_seconds());
cake_transform.scale =
Vec3::splat(1.0 + (game.score as f32 / 10.0 * time.elapsed_seconds().sin()).abs());
}
}
}
// update the score displayed during the game
fn scoreboard_system(game: Res<Game>, mut query: Query<&mut Text>) {
let mut text = query.single_mut();
text.sections[0].value = format!("Sugar Rush: {}", game.score);
}
// restart the game when pressing spacebar
fn gameover_keyboard(
mut next_state: ResMut<NextState<GameState>>,
keyboard_input: Res<ButtonInput<KeyCode>>,
) {
if keyboard_input.just_pressed(KeyCode::Space) {
next_state.set(GameState::Playing);
}
}
// display the number of cake eaten before losing
fn display_score(mut commands: Commands, game: Res<Game>) {
commands
.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.),
align_items: AlignItems::Center,
justify_content: JustifyContent::Center,
..default()
},
..default()
})
.with_children(|parent| {
parent.spawn(TextBundle::from_section(
format!("Cake eaten: {}", game.cake_eaten),
TextStyle {
font_size: 80.0,
color: Color::rgb(0.5, 0.5, 1.0),
..default()
},
));
});
}