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.
75 lines
2.3 KiB
Rust
75 lines
2.3 KiB
Rust
//! Update a scene from a glTF file, either by spawning the scene as a child of another entity,
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//! or by accessing the entities of the scene.
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use bevy::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(move_scene_entities)
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.run();
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}
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#[derive(Component)]
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struct MovedScene;
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fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
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commands.spawn(PointLightBundle {
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transform: Transform::from_xyz(4.0, 5.0, 4.0),
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..default()
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});
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commands.spawn(Camera3dBundle {
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transform: Transform::from_xyz(1.05, 0.9, 1.5)
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.looking_at(Vec3::new(0.0, 0.3, 0.0), Vec3::Y),
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..default()
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});
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// Spawn the scene as a child of this entity at the given transform
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commands.spawn(SceneBundle {
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transform: Transform::from_xyz(0.0, 0.0, -1.0),
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scene: asset_server.load("models/FlightHelmet/FlightHelmet.gltf#Scene0"),
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..default()
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});
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// Spawn a second scene, and add a tag component to be able to target it later
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commands.spawn((
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SceneBundle {
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scene: asset_server.load("models/FlightHelmet/FlightHelmet.gltf#Scene0"),
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..default()
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},
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MovedScene,
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));
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}
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// This system will move all entities that are descendants of MovedScene (which will be all entities spawned in the scene)
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fn move_scene_entities(
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time: Res<Time>,
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moved_scene: Query<Entity, With<MovedScene>>,
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children: Query<&Children>,
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mut transforms: Query<&mut Transform>,
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) {
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for moved_scene_entity in &moved_scene {
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let mut offset = 0.;
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iter_hierarchy(moved_scene_entity, &children, &mut |entity| {
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if let Ok(mut transform) = transforms.get_mut(entity) {
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transform.translation = Vec3::new(
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offset * time.elapsed_seconds().sin() / 20.,
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0.,
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time.elapsed_seconds().cos() / 20.,
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);
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offset += 1.0;
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}
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});
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}
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}
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fn iter_hierarchy(entity: Entity, children_query: &Query<&Children>, f: &mut impl FnMut(Entity)) {
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(f)(entity);
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if let Ok(children) = children_query.get(entity) {
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for child in children.iter().copied() {
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iter_hierarchy(child, children_query, f);
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}
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}
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}
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