340 lines
9.3 KiB
Rust
340 lines
9.3 KiB
Rust
use bevy::prelude::*;
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use rand::{prelude::SliceRandom, Rng};
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use std::{
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collections::BTreeSet,
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io::{BufRead, BufReader},
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process::Stdio,
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};
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fn main() {
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App::build()
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup.system())
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.add_system(velocity_system.system())
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.add_system(move_system.system())
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.add_system(collision_system.system())
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.add_system(select_system.system())
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.run();
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}
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type Contributors = BTreeSet<String>;
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struct ContributorSelection {
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order: Vec<(String, Entity)>,
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idx: usize,
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}
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struct SelectTimer;
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struct ContributorDisplay;
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struct Contributor {
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color: [f32; 3],
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}
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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 COL_DESELECTED: Color = Color::rgba_linear(0.03, 0.03, 0.03, 0.92);
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const COL_SELECTED: Color = Color::WHITE;
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const SHOWCASE_TIMER_SECS: f32 = 3.0;
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fn setup(
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commands: &mut Commands,
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asset_server: Res<AssetServer>,
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mut materials: ResMut<Assets<ColorMaterial>>,
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) {
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let contribs = contributors();
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let texture_handle = asset_server.load("branding/icon.png");
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commands
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.spawn(Camera2dBundle::default())
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.spawn(CameraUiBundle::default());
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let mut sel = ContributorSelection {
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order: vec![],
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idx: 0,
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};
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let mut rnd = rand::thread_rng();
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for name in contribs {
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let pos = (rnd.gen_range(-400.0..400.0), rnd.gen_range(0.0..400.0));
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let dir = rnd.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 col = gen_color(&mut rnd);
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// some sprites should be flipped
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let flipped = rnd.gen_bool(0.5);
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let mut transform = Transform::from_xyz(pos.0, pos.1, 0.0);
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transform.scale.x *= if flipped { -1.0 } else { 1.0 };
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commands
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.spawn((Contributor { color: col },))
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.with(Velocity {
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translation: velocity,
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rotation: -dir * 5.0,
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})
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.with_bundle(SpriteBundle {
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sprite: Sprite {
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size: Vec2::new(1.0, 1.0) * SPRITE_SIZE,
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resize_mode: SpriteResizeMode::Manual,
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},
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material: materials.add(ColorMaterial {
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color: COL_DESELECTED * col,
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texture: Some(texture_handle.clone()),
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}),
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..Default::default()
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})
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.with(transform);
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let e = commands.current_entity().unwrap();
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sel.order.push((name, e));
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}
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sel.order.shuffle(&mut rnd);
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commands.spawn((SelectTimer, Timer::from_seconds(SHOWCASE_TIMER_SECS, true)));
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commands
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.spawn((ContributorDisplay,))
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.with_bundle(TextBundle {
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style: Style {
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align_self: AlignSelf::FlexEnd,
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..Default::default()
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},
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text: Text {
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sections: vec![
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TextSection {
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value: "Contributor showcase".to_string(),
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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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color: Color::WHITE,
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},
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},
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TextSection {
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value: "".to_string(),
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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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color: Color::WHITE,
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},
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},
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],
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..Default::default()
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},
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..Default::default()
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});
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commands.insert_resource(sel);
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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 materials: ResMut<Assets<ColorMaterial>>,
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mut sel: ResMut<ContributorSelection>,
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mut dq: Query<Mut<Text>, With<ContributorDisplay>>,
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mut tq: Query<Mut<Timer>, With<SelectTimer>>,
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mut q: Query<(&Contributor, &Handle<ColorMaterial>, &mut Transform)>,
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time: Res<Time>,
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) {
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let mut timer_fired = false;
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for mut t in tq.iter_mut() {
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if !t.tick(time.delta_seconds()).just_finished() {
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continue;
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}
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t.reset();
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timer_fired = true;
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}
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if !timer_fired {
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return;
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}
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let prev = sel.idx;
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if (sel.idx + 1) < sel.order.len() {
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sel.idx += 1;
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} else {
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sel.idx = 0;
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}
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{
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let (_, e) = &sel.order[prev];
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if let Ok((c, handle, mut tr)) = q.get_mut(*e) {
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deselect(&mut *materials, handle.clone(), c, &mut *tr);
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}
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}
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let (name, e) = &sel.order[sel.idx];
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if let Ok((c, handle, mut tr)) = q.get_mut(*e) {
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for mut text in dq.iter_mut() {
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select(
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&mut *materials,
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handle.clone(),
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c,
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&mut *tr,
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&mut *text,
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name,
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);
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}
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}
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}
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/// Change the modulate color to the "selected" colour,
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/// bring the object to the front and display the name.
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fn select(
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materials: &mut Assets<ColorMaterial>,
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mat_handle: Handle<ColorMaterial>,
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cont: &Contributor,
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trans: &mut Transform,
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text: &mut Text,
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name: &str,
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) -> Option<()> {
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let mat = materials.get_mut(mat_handle)?;
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mat.color = COL_SELECTED * cont.color;
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trans.translation.z = 100.0;
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text.sections[0].value = "Contributor: ".to_string();
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text.sections[1].value = name.to_string();
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text.sections[1].style.color = mat.color;
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Some(())
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}
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/// Change the modulate color to the "deselected" colour and push
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/// the object to the back.
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fn deselect(
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materials: &mut Assets<ColorMaterial>,
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mat_handle: Handle<ColorMaterial>,
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cont: &Contributor,
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trans: &mut Transform,
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) -> Option<()> {
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let mat = materials.get_mut(mat_handle)?;
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mat.color = COL_DESELECTED * cont.color;
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trans.translation.z = 0.0;
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Some(())
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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 q: Query<Mut<Velocity>>) {
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let delta = time.delta_seconds();
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for mut v in q.iter_mut() {
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v.translation += Vec3::new(0.0, GRAVITY * delta, 0.0);
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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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wins: Res<Windows>,
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mut q: Query<(Mut<Velocity>, Mut<Transform>), With<Contributor>>,
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) {
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let mut rnd = rand::thread_rng();
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let win = wins.get_primary().unwrap();
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let ceiling = win.height() / 2.;
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let ground = -(win.height() / 2.);
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let wall_left = -(win.width() / 2.);
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let wall_right = win.width() / 2.;
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for (mut v, mut t) in q.iter_mut() {
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let left = t.translation.x - SPRITE_SIZE / 2.0;
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let right = t.translation.x + SPRITE_SIZE / 2.0;
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let top = t.translation.y + SPRITE_SIZE / 2.0;
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let bottom = t.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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t.translation.y = ground + SPRITE_SIZE / 2.0;
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// apply an impulse upwards
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v.translation.y = rnd.gen_range(700.0..1000.0);
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}
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if top > ceiling {
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t.translation.y = ceiling - SPRITE_SIZE / 2.0;
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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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t.translation.x = wall_left + SPRITE_SIZE / 2.0;
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v.translation.x *= -1.0;
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v.rotation *= -1.0;
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}
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if right > wall_right {
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t.translation.x = wall_right - SPRITE_SIZE / 2.0;
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v.translation.x *= -1.0;
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v.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 q: Query<(&Velocity, Mut<Transform>)>) {
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let delta = time.delta_seconds();
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for (v, mut t) in q.iter_mut() {
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t.translation += delta * v.translation;
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t.rotate(Quat::from_rotation_z(v.rotation * delta));
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}
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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() -> Contributors {
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let manifest_dir = std::env::var("CARGO_MANIFEST_DIR")
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.expect("This example needs to run through `cargo run --example`.");
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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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.expect("`git` needs to be installed.");
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let stdout = cmd.stdout.take().expect("`Child` should have a stdout.");
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BufReader::new(stdout)
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.lines()
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.filter_map(|x| x.ok())
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.collect()
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}
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/// Generate a color modulation
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///
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/// Because there is no `Mul<Color> for Color` instead `[f32; 3]` is
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/// used.
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fn gen_color(rng: &mut impl Rng) -> [f32; 3] {
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loop {
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let rgb = rng.gen();
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if luminance(rgb) >= 0.6 {
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break rgb;
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}
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}
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}
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fn luminance([r, g, b]: [f32; 3]) -> f32 {
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0.299 * r + 0.587 * g + 0.114 * b
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}
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