1918608b02
# Objective - Changes the default clear color to match the code block color on Bevy's website. ## Solution - Changed the clear color, updated text in examples to ensure adequate contrast. Inconsistent usage of white text color set to use the default color instead, which is already white. - Additionally, updated the `3d_scene` example to make it look a bit better, and use bevy's branding colors. 
348 lines
10 KiB
Rust
348 lines
10 KiB
Rust
//! This example displays each contributor to the bevy source code as a bouncing bevy-ball.
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use bevy::{
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prelude::*,
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utils::{thiserror, HashSet},
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};
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use rand::{prelude::SliceRandom, Rng};
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use std::{
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env::VarError,
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io::{self, BufRead, BufReader},
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process::Stdio,
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};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.init_resource::<SelectionState>()
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.add_systems(Startup, (setup_contributor_selection, setup))
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.add_systems(
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Update,
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(
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velocity_system,
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move_system,
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collision_system,
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select_system,
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),
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)
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.run();
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}
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// Store contributors in a collection that preserves the uniqueness
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type Contributors = HashSet<String>;
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#[derive(Resource)]
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struct ContributorSelection {
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order: Vec<Entity>,
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idx: usize,
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}
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#[derive(Resource)]
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struct SelectionState {
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timer: Timer,
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has_triggered: bool,
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}
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impl Default for SelectionState {
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fn default() -> Self {
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Self {
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timer: Timer::from_seconds(SHOWCASE_TIMER_SECS, TimerMode::Repeating),
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has_triggered: false,
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}
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}
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}
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#[derive(Component)]
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struct ContributorDisplay;
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#[derive(Component)]
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struct Contributor {
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name: String,
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hue: f32,
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}
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#[derive(Component)]
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struct Velocity {
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translation: Vec3,
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rotation: f32,
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}
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const GRAVITY: f32 = 9.821 * 100.0;
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const SPRITE_SIZE: f32 = 75.0;
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const SATURATION_DESELECTED: f32 = 0.3;
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const LIGHTNESS_DESELECTED: f32 = 0.2;
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const SATURATION_SELECTED: f32 = 0.9;
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const LIGHTNESS_SELECTED: f32 = 0.7;
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const ALPHA: f32 = 0.92;
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const SHOWCASE_TIMER_SECS: f32 = 3.0;
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const CONTRIBUTORS_LIST: &[&str] = &["Carter Anderson", "And Many More"];
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fn setup_contributor_selection(mut commands: Commands, asset_server: Res<AssetServer>) {
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// Load contributors from the git history log or use default values from
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// the constant array. Contributors must be unique, so they are stored in a HashSet
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let contribs = contributors().unwrap_or_else(|_| {
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CONTRIBUTORS_LIST
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.iter()
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.map(|name| name.to_string())
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.collect()
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});
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let texture_handle = asset_server.load("branding/icon.png");
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let mut contributor_selection = ContributorSelection {
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order: Vec::with_capacity(contribs.len()),
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idx: 0,
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};
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let mut rng = rand::thread_rng();
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for name in contribs {
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let pos = (rng.gen_range(-400.0..400.0), rng.gen_range(0.0..400.0));
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let dir = rng.gen_range(-1.0..1.0);
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let velocity = Vec3::new(dir * 500.0, 0.0, 0.0);
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let hue = rng.gen_range(0.0..=360.0);
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// some sprites should be flipped
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let flipped = rng.gen_bool(0.5);
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let transform = Transform::from_xyz(pos.0, pos.1, 0.0);
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let entity = commands
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.spawn((
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Contributor { name, hue },
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Velocity {
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translation: velocity,
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rotation: -dir * 5.0,
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},
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SpriteBundle {
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sprite: Sprite {
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custom_size: Some(Vec2::new(1.0, 1.0) * SPRITE_SIZE),
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color: Color::hsla(hue, SATURATION_DESELECTED, LIGHTNESS_DESELECTED, ALPHA),
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flip_x: flipped,
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..default()
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},
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texture: texture_handle.clone(),
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transform,
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..default()
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},
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))
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.id();
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contributor_selection.order.push(entity);
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}
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contributor_selection.order.shuffle(&mut rng);
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commands.insert_resource(contributor_selection);
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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commands.spawn(Camera2dBundle::default());
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commands.spawn((
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TextBundle::from_sections([
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TextSection::new(
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"Contributor showcase",
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TextStyle {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 60.0,
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..default()
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},
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),
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TextSection::from_style(TextStyle {
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font: asset_server.load("fonts/FiraSans-Bold.ttf"),
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font_size: 60.0,
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..default()
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}),
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])
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.with_style(Style {
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align_self: AlignSelf::FlexEnd,
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..default()
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}),
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ContributorDisplay,
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));
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}
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/// Finds the next contributor to display and selects the entity
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fn select_system(
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mut timer: ResMut<SelectionState>,
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mut contributor_selection: ResMut<ContributorSelection>,
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mut text_query: Query<&mut Text, With<ContributorDisplay>>,
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mut query: Query<(&Contributor, &mut Sprite, &mut Transform)>,
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time: Res<Time>,
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) {
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if !timer.timer.tick(time.delta()).just_finished() {
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return;
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}
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if !timer.has_triggered {
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let mut text = text_query.single_mut();
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text.sections[0].value = "Contributor: ".to_string();
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timer.has_triggered = true;
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}
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let entity = contributor_selection.order[contributor_selection.idx];
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if let Ok((contributor, mut sprite, mut transform)) = query.get_mut(entity) {
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deselect(&mut sprite, contributor, &mut transform);
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}
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if (contributor_selection.idx + 1) < contributor_selection.order.len() {
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contributor_selection.idx += 1;
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} else {
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contributor_selection.idx = 0;
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}
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let entity = contributor_selection.order[contributor_selection.idx];
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if let Ok((contributor, mut sprite, mut transform)) = query.get_mut(entity) {
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let mut text = text_query.single_mut();
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select(&mut sprite, contributor, &mut transform, &mut text);
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}
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}
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/// Change the tint color to the "selected" color, bring the object to the front
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/// and display the name.
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fn select(
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sprite: &mut Sprite,
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contributor: &Contributor,
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transform: &mut Transform,
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text: &mut Text,
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) {
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sprite.color = Color::hsla(
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contributor.hue,
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SATURATION_SELECTED,
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LIGHTNESS_SELECTED,
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ALPHA,
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);
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transform.translation.z = 100.0;
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text.sections[1].value.clone_from(&contributor.name);
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text.sections[1].style.color = sprite.color;
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}
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/// Change the modulate color to the "deselected" color and push
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/// the object to the back.
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fn deselect(sprite: &mut Sprite, contributor: &Contributor, transform: &mut Transform) {
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sprite.color = Color::hsla(
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contributor.hue,
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SATURATION_DESELECTED,
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LIGHTNESS_DESELECTED,
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ALPHA,
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);
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transform.translation.z = 0.0;
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}
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/// Applies gravity to all entities with velocity
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fn velocity_system(time: Res<Time>, mut velocity_query: Query<&mut Velocity>) {
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let delta = time.delta_seconds();
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for mut velocity in &mut velocity_query {
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velocity.translation.y -= GRAVITY * delta;
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}
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}
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/// Checks for collisions of contributor-birds.
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///
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/// On collision with left-or-right wall it resets the horizontal
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/// velocity. On collision with the ground it applies an upwards
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/// force.
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fn collision_system(
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windows: Query<&Window>,
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mut query: Query<(&mut Velocity, &mut Transform), With<Contributor>>,
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) {
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let window = windows.single();
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let ceiling = window.height() / 2.;
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let ground = -window.height() / 2.;
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let wall_left = -window.width() / 2.;
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let wall_right = window.width() / 2.;
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// The maximum height the birbs should try to reach is one birb below the top of the window.
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let max_bounce_height = (window.height() - SPRITE_SIZE * 2.0).max(0.0);
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let mut rng = rand::thread_rng();
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for (mut velocity, mut transform) in &mut query {
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let left = transform.translation.x - SPRITE_SIZE / 2.0;
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let right = transform.translation.x + SPRITE_SIZE / 2.0;
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let top = transform.translation.y + SPRITE_SIZE / 2.0;
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let bottom = transform.translation.y - SPRITE_SIZE / 2.0;
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// clamp the translation to not go out of the bounds
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if bottom < ground {
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transform.translation.y = ground + SPRITE_SIZE / 2.0;
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// How high this birb will bounce.
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let bounce_height = rng.gen_range((max_bounce_height * 0.4)..=max_bounce_height);
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// Apply the velocity that would bounce the birb up to bounce_height.
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velocity.translation.y = (bounce_height * GRAVITY * 2.).sqrt();
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}
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if top > ceiling {
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transform.translation.y = ceiling - SPRITE_SIZE / 2.0;
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velocity.translation.y *= -1.0;
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}
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// on side walls flip the horizontal velocity
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if left < wall_left {
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transform.translation.x = wall_left + SPRITE_SIZE / 2.0;
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velocity.translation.x *= -1.0;
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velocity.rotation *= -1.0;
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}
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if right > wall_right {
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transform.translation.x = wall_right - SPRITE_SIZE / 2.0;
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velocity.translation.x *= -1.0;
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velocity.rotation *= -1.0;
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}
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}
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}
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/// Apply velocity to positions and rotations.
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fn move_system(time: Res<Time>, mut query: Query<(&Velocity, &mut Transform)>) {
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let delta = time.delta_seconds();
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for (velocity, mut transform) in &mut query {
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transform.translation += delta * velocity.translation;
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transform.rotate_z(velocity.rotation * delta);
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}
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}
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#[derive(Debug, thiserror::Error)]
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enum LoadContributorsError {
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#[error("An IO error occurred while reading the git log.")]
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Io(#[from] io::Error),
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#[error("The CARGO_MANIFEST_DIR environment variable was not set.")]
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Var(#[from] VarError),
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#[error("The git process did not return a stdout handle.")]
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Stdout,
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}
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/// Get the names of all contributors from the git log.
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///
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/// The names are deduplicated.
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/// This function only works if `git` is installed and
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/// the program is run through `cargo`.
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fn contributors() -> Result<Contributors, LoadContributorsError> {
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let manifest_dir = std::env::var("CARGO_MANIFEST_DIR")?;
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let mut cmd = std::process::Command::new("git")
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.args(["--no-pager", "log", "--pretty=format:%an"])
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.current_dir(manifest_dir)
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.stdout(Stdio::piped())
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.spawn()?;
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let stdout = cmd.stdout.take().ok_or(LoadContributorsError::Stdout)?;
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let contributors = BufReader::new(stdout)
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.lines()
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.map_while(|x| x.ok())
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.collect();
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Ok(contributors)
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}
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