41 lines
952 B
Rust
41 lines
952 B
Rust
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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_systems(Startup, add_people)
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.add_systems(Update, (hello_world, (update_people, greet_people).chain()))
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.run();
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}
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fn hello_world() {
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println!("hi!");
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}
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#[derive(Component)]
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struct Person;
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#[derive(Component)]
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struct Name(String);
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fn add_people(mut commands: Commands) {
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commands.spawn((Person, Name("Albert Einstein".to_string())));
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commands.spawn((Person, Name("Robert Oppenheimer".to_string())));
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commands.spawn((Person, Name("Marie Skłodowska".to_string())));
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}
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fn greet_people(query: Query<&Name, With<Person>>) {
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for name in &query {
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println!("hello {}!", name.0);
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}
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}
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fn update_people(mut query: Query<&mut Name, With<Person>>) {
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for mut name in &mut query {
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if name.0 == "Marie Skłodowska" {
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name.0 = "Marie Curie".to_string();
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break;
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}
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}
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}
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