mirror of
https://github.com/bevyengine/bevy
synced 2024-12-25 20:43:07 +00:00
7482a0d26d
Fixes #15834 ## Migration Guide The APIs of `Time`, `Timer` and `Stopwatch` have been cleaned up for consistency with each other and the standard library's `Duration` type. The following methods have been renamed: - `Stowatch::paused` -> `Stopwatch::is_paused` - `Time::elapsed_seconds` -> `Time::elasped_secs` (including `_f64` and `_wrapped` variants)
40 lines
1.3 KiB
Rust
40 lines
1.3 KiB
Rust
//! Shows how to create systems that run every fixed timestep, rather than every tick.
|
|
|
|
use bevy::prelude::*;
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
// this system will run once every update (it should match your screen's refresh rate)
|
|
.add_systems(Update, frame_update)
|
|
// add our system to the fixed timestep schedule
|
|
.add_systems(FixedUpdate, fixed_update)
|
|
// configure our fixed timestep schedule to run twice a second
|
|
.insert_resource(Time::<Fixed>::from_seconds(0.5))
|
|
.run();
|
|
}
|
|
|
|
fn frame_update(mut last_time: Local<f32>, time: Res<Time>) {
|
|
// Default `Time` is `Time<Virtual>` here
|
|
info!(
|
|
"time since last frame_update: {}",
|
|
time.elapsed_secs() - *last_time
|
|
);
|
|
*last_time = time.elapsed_secs();
|
|
}
|
|
|
|
fn fixed_update(mut last_time: Local<f32>, time: Res<Time>, fixed_time: Res<Time<Fixed>>) {
|
|
// Default `Time`is `Time<Fixed>` here
|
|
info!(
|
|
"time since last fixed_update: {}\n",
|
|
time.elapsed_secs() - *last_time
|
|
);
|
|
|
|
info!("fixed timestep: {}\n", time.delta_secs());
|
|
// If we want to see the overstep, we need to access `Time<Fixed>` specifically
|
|
info!(
|
|
"time accrued toward next fixed_update: {}\n",
|
|
fixed_time.overstep().as_secs_f32()
|
|
);
|
|
*last_time = time.elapsed_secs();
|
|
}
|