17e504812b
# Objective clean up example get_single method, make code clean; ## Solution - replace `Query` with `Single` Query - remove `get_single` or `get_single_mut` condition block
40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
//! This example illustrates how to load and play an audio file, and control how it's played.
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use bevy::{math::ops, prelude::*};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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.add_systems(Update, (update_speed, pause, volume))
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.run();
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}
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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commands.spawn((
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AudioPlayer::<AudioSource>(asset_server.load("sounds/Windless Slopes.ogg")),
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MyMusic,
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));
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}
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#[derive(Component)]
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struct MyMusic;
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fn update_speed(sink: Single<&AudioSink, With<MyMusic>>, time: Res<Time>) {
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sink.set_speed((ops::sin(time.elapsed_secs() / 5.0) + 1.0).max(0.1));
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}
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fn pause(keyboard_input: Res<ButtonInput<KeyCode>>, sink: Single<&AudioSink, With<MyMusic>>) {
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if keyboard_input.just_pressed(KeyCode::Space) {
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sink.toggle();
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}
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}
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fn volume(keyboard_input: Res<ButtonInput<KeyCode>>, sink: Single<&AudioSink, With<MyMusic>>) {
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if keyboard_input.just_pressed(KeyCode::Equal) {
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sink.set_volume(sink.volume() + 0.1);
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} else if keyboard_input.just_pressed(KeyCode::Minus) {
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sink.set_volume(sink.volume() - 0.1);
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}
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}
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