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use ecs::component::single::Single;
use ecs::event::Event;
use ecs::{Component, Query, World};
#[derive(Component)]
struct Ammo
{
ammo_left: u32,
}
#[derive(Component, Default)]
struct AmmoCounter
{
counter: u32,
}
fn count_ammo(query: Query<(Ammo,)>, mut ammo_counter: Single<AmmoCounter>)
{
for (ammo,) in &query {
println!("Found {} ammo", ammo.ammo_left);
ammo_counter.counter += ammo.ammo_left;
}
}
fn print_total_ammo_count(ammo_counter: Single<AmmoCounter>)
{
println!("Total ammo count: {}", ammo_counter.counter);
assert_eq!(ammo_counter.counter, 19);
}
#[derive(Debug)]
struct EventA;
impl Event for EventA {}
#[derive(Debug)]
struct EventB;
impl Event for EventB {}
fn main()
{
let mut world = World::new();
world.register_system(EventA, count_ammo);
world.register_system(EventB, print_total_ammo_count);
world.create_entity((Ammo { ammo_left: 4 },));
world.create_entity((Ammo { ammo_left: 7 },));
world.create_entity((Ammo { ammo_left: 8 },));
world.add_single_component(AmmoCounter::default()).unwrap();
world.emit(EventA);
world.emit(EventB);
}
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