mirror of
https://github.com/bevyengine/bevy
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42 lines
1.1 KiB
Rust
42 lines
1.1 KiB
Rust
//! In this example we add a counter resource and increase its value in one system,
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//! while a different system prints the current count to the console.
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use bevy_ecs::prelude::*;
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use rand::Rng;
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use std::ops::Deref;
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fn main() {
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// Create a world
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let mut world = World::new();
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// Add the counter resource
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world.insert_resource(Counter { value: 0 });
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// Create a schedule
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let mut schedule = Schedule::default();
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// Add systems to increase the counter and to print out the current value
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schedule.add_systems((increase_counter, print_counter).chain());
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for iteration in 1..=10 {
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println!("Simulating frame {iteration}/10");
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schedule.run(&mut world);
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}
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}
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// Counter resource to be increased and read by systems
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#[derive(Debug, Resource)]
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struct Counter {
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pub value: i32,
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}
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fn increase_counter(mut counter: ResMut<Counter>) {
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if rand::thread_rng().gen_bool(0.5) {
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counter.value += 1;
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println!(" Increased counter value");
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}
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}
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fn print_counter(counter: Res<Counter>) {
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println!(" {:?}", counter.deref());
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}
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