mirror of
https://github.com/bevyengine/bevy.git
synced 2026-07-01 00:05:45 -04:00
Carter Anderson
4d74baf1ae
This renames the concept of `BufferedEvent` to `Message`, and updates our APIs, comments, and documentation to refer to these types as "messages" instead of "events". It also removes/updates anything that considers messages to be "observable", "listenable", or "triggerable". This is a followup to https://github.com/bevyengine/bevy/pull/20731, which omitted the `BufferedEvent -> Message` rename for brevity. See that post for rationale.
56 lines
1.5 KiB
Rust
56 lines
1.5 KiB
Rust
//! This example illustrates how to play a single-frequency sound (aka a pitch)
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use bevy::prelude::*;
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use std::time::Duration;
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_message::<PlayPitch>()
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.add_systems(Startup, setup)
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.add_systems(Update, (play_pitch, keyboard_input_system))
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.run();
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}
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#[derive(Message, Default)]
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struct PlayPitch;
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#[derive(Resource)]
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struct PitchFrequency(f32);
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fn setup(mut commands: Commands) {
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commands.insert_resource(PitchFrequency(220.0));
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}
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fn play_pitch(
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mut pitch_assets: ResMut<Assets<Pitch>>,
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frequency: Res<PitchFrequency>,
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mut play_pitch_reader: MessageReader<PlayPitch>,
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mut commands: Commands,
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) {
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for _ in play_pitch_reader.read() {
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info!("playing pitch with frequency: {}", frequency.0);
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commands.spawn((
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AudioPlayer(pitch_assets.add(Pitch::new(frequency.0, Duration::new(1, 0)))),
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PlaybackSettings::DESPAWN,
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));
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info!("number of pitch assets: {}", pitch_assets.len());
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}
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}
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fn keyboard_input_system(
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keyboard_input: Res<ButtonInput<KeyCode>>,
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mut frequency: ResMut<PitchFrequency>,
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mut play_pitch_writer: MessageWriter<PlayPitch>,
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) {
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if keyboard_input.just_pressed(KeyCode::ArrowUp) {
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frequency.0 *= ops::powf(2.0f32, 1.0 / 12.0);
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}
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if keyboard_input.just_pressed(KeyCode::ArrowDown) {
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frequency.0 /= ops::powf(2.0f32, 1.0 / 12.0);
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}
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if keyboard_input.just_pressed(KeyCode::Space) {
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play_pitch_writer.write(PlayPitch);
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}
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}
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