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fixed_timestep.rs
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fixed_timestep.rs
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use bevy::{
core::{FixedTimestep, FixedTimesteps},
prelude::*,
};
const LABEL: &str = "my_fixed_timestep";
#[derive(Debug, Hash, PartialEq, Eq, Clone, StageLabel)]
struct FixedUpdateStage;
fn main() {
App::build()
.add_plugins(DefaultPlugins)
// this system will run once every update (it should match your screen's refresh rate)
.add_system(update.system())
// add a new stage that runs every two seconds
.add_stage_after(
CoreStage::Update,
FixedUpdateStage,
SystemStage::parallel()
.with_run_criteria(
FixedTimestep::step(2.0)
// labels are optional. they provide a way to access the current FixedTimestep state from within a system
.with_label(LABEL),
)
.with_system(fixed_update.system()),
)
.run();
}
fn update(mut last_time: Local<f64>, time: Res<Time>) {
println!("update: {}", time.seconds_since_startup() - *last_time);
*last_time = time.seconds_since_startup();
}
fn fixed_update(mut last_time: Local<f64>, time: Res<Time>, fixed_timesteps: Res<FixedTimesteps>) {
println!(
"fixed_update: {}",
time.seconds_since_startup() - *last_time,
);
let fixed_timestep = fixed_timesteps.get(LABEL).unwrap();
println!(
" overstep_percentage: {}",
fixed_timestep.overstep_percentage()
);
*last_time = time.seconds_since_startup();
}