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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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|
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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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|
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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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|
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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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|
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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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} |