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use engine_ecs::pair::ChildOf;
use engine_ecs::phase::START as START_PHASE;
use engine_ecs::query::term::{Traverse, TraverseSelfOrUp};
use engine_ecs::{pair, Component, Query, World};
#[derive(Component)]
struct SomeData
{
num: u64,
}
#[derive(Component)]
struct Greeting
{
greeting: String,
}
fn say_hello(query: Query<(Traverse<(&Greeting,), TraverseSelfOrUp, ChildOf>, &SomeData)>)
{
for (greeting, data) in &query {
println!("{}: {}", greeting.greeting, data.num);
}
}
fn main()
{
let mut world = World::new();
world.register_system(*START_PHASE, say_hello);
let parent_ent = world.spawn((Greeting {
greeting: "Good afternoon".to_string(),
},));
world.spawn((SomeData { num: 345 }, pair!(ChildOf, { parent_ent })));
world.spawn((
SomeData { num: 123 },
Greeting { greeting: "Good evening".to_string() },
pair!(ChildOf, { parent_ent }),
));
world.step();
}
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