7989cb2650
# Objective - Make `Time` API more consistent. - Support time accel/decel/pause. ## Solution This is just the `Time` half of #3002. I was told that part isn't controversial. - Give the "delta time" and "total elapsed time" methods `f32`, `f64`, and `Duration` variants with consistent naming. - Implement accelerating / decelerating the passage of time. - Implement stopping time. --- ## Changelog - Changed `time_since_startup` to `elapsed` because `time.time_*` is just silly. - Added `relative_speed` and `set_relative_speed` methods. - Added `is_paused`, `pause`, `unpause` , and methods. (I'd prefer `resume`, but `unpause` matches `Timer` API.) - Added `raw_*` variants of the "delta time" and "total elapsed time" methods. - Added `first_update` method because there's a non-zero duration between startup and the first update. ## Migration Guide - `time.time_since_startup()` -> `time.elapsed()` - `time.seconds_since_startup()` -> `time.elapsed_seconds_f64()` - `time.seconds_since_startup_wrapped_f32()` -> `time.elapsed_seconds_wrapped()` If you aren't sure which to use, most systems should continue to use "scaled" time (e.g. `time.delta_seconds()`). The realtime "unscaled" time measurements (e.g. `time.raw_delta_seconds()`) are mostly for debugging and profiling.
68 lines
1.8 KiB
Rust
68 lines
1.8 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::{audio::AudioSink, 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_startup_system(setup)
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.add_system(update_speed)
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.add_system(pause)
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.add_system(volume)
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.run();
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}
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fn setup(
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mut commands: Commands,
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asset_server: Res<AssetServer>,
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audio: Res<Audio>,
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audio_sinks: Res<Assets<AudioSink>>,
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) {
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let music = asset_server.load("sounds/Windless Slopes.ogg");
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let handle = audio_sinks.get_handle(audio.play(music));
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commands.insert_resource(MusicController(handle));
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}
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#[derive(Resource)]
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struct MusicController(Handle<AudioSink>);
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fn update_speed(
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audio_sinks: Res<Assets<AudioSink>>,
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music_controller: Res<MusicController>,
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time: Res<Time>,
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) {
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if let Some(sink) = audio_sinks.get(&music_controller.0) {
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sink.set_speed(((time.elapsed_seconds() / 5.0).sin() + 1.0).max(0.1));
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}
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}
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fn pause(
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keyboard_input: Res<Input<KeyCode>>,
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audio_sinks: Res<Assets<AudioSink>>,
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music_controller: Res<MusicController>,
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) {
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if keyboard_input.just_pressed(KeyCode::Space) {
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if let Some(sink) = audio_sinks.get(&music_controller.0) {
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if sink.is_paused() {
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sink.play();
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} else {
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sink.pause();
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}
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}
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}
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}
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fn volume(
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keyboard_input: Res<Input<KeyCode>>,
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audio_sinks: Res<Assets<AudioSink>>,
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music_controller: Res<MusicController>,
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) {
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if let Some(sink) = audio_sinks.get(&music_controller.0) {
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if keyboard_input.just_pressed(KeyCode::Plus) {
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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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}
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