51 lines
1.3 KiB
Rust
51 lines
1.3 KiB
Rust
use bevy::{log::LogPlugin, prelude::*};
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fn main() {
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App::new()
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.add_plugin(LogPlugin)
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.add_startup_system(setup.system())
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.add_system(log_names.system().label(LogNamesSystem))
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.add_system(log_person_bundles.system().after(LogNamesSystem))
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.run();
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}
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#[derive(Debug, Hash, PartialEq, Eq, Clone, SystemLabel)]
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struct LogNamesSystem;
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#[derive(Debug)]
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struct Name(String);
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#[derive(Debug)]
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struct Age(usize);
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#[derive(Debug, Bundle)]
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struct PersonBundle {
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name: Name,
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age: Age,
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}
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/// Sets up two entities, one with a [Name] component as part of a bundle,
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/// and one entity with [Name] only.
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fn setup(mut commands: Commands) {
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commands.spawn().insert(Name("Steve".to_string()));
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commands.spawn().insert_bundle(PersonBundle {
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name: Name("Bob".to_string()),
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age: Age(40),
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});
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}
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fn log_names(query: Query<&Name>) {
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info!("Log all entities with `Name` component");
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// this will necessarily have to print both components.
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for name in query.iter() {
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info!("{:?}", name);
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}
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}
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fn log_person_bundles(query: Query<&Name, WithBundle<PersonBundle>>) {
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info!("Log `Name` components from entities that have all components in `PersonBundle`.");
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// this should only print `Name("Bob")`.
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for name in query.iter() {
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info!("{:?}", name);
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}
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}
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