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pitch.rs
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pitch.rs
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//! This example illustrates how to play a single-frequency sound (aka a pitch)
use bevy::prelude::*;
use std::time::Duration;
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_event::<PlayPitch>()
.add_systems(Startup, setup)
.add_systems(Update, (play_pitch, keyboard_input_system))
.run();
}
#[derive(Event, Default)]
struct PlayPitch;
#[derive(Resource)]
struct PitchFrequency(f32);
fn setup(mut commands: Commands) {
commands.insert_resource(PitchFrequency(220.0));
}
fn play_pitch(
mut pitch_assets: ResMut<Assets<Pitch>>,
frequency: Res<PitchFrequency>,
mut events: EventReader<PlayPitch>,
mut commands: Commands,
) {
for _ in events.read() {
info!("playing pitch with frequency: {}", frequency.0);
commands.spawn(PitchBundle {
source: pitch_assets.add(Pitch::new(frequency.0, Duration::new(1, 0))),
settings: PlaybackSettings::DESPAWN,
});
info!("number of pitch assets: {}", pitch_assets.len());
}
}
fn keyboard_input_system(
keyboard_input: Res<ButtonInput<KeyCode>>,
mut frequency: ResMut<PitchFrequency>,
mut events: EventWriter<PlayPitch>,
) {
if keyboard_input.just_pressed(KeyCode::ArrowUp) {
frequency.0 *= 2.0f32.powf(1.0 / 12.0);
}
if keyboard_input.just_pressed(KeyCode::ArrowDown) {
frequency.0 /= 2.0f32.powf(1.0 / 12.0);
}
if keyboard_input.just_pressed(KeyCode::Space) {
events.send(PlayPitch);
}
}