1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
use ecs::actions::Actions;
use ecs::component::Component;
use ecs::event::component::Removed;
use ecs::pair::Pair;
use ecs::phase::UPDATE;
use ecs::system::observer::Observe;
use ecs::{Component, Query, World};
#[derive(Debug, Component)]
struct Cheese
{
name: &'static str,
}
fn eat_cheese(query: Query<(&Cheese,)>, mut actions: Actions)
{
for (cheese_ent_id, (_,)) in query.iter_with_euids() {
println!("Eating cheese!");
actions.remove_components(cheese_ent_id, [Cheese::id()]);
}
}
fn on_cheese_removed(observe: Observe<Pair<Removed, Cheese>>)
{
for evt_match in &observe {
let ent = evt_match.get_entity().unwrap();
let cheese = ent.get::<Cheese>().unwrap();
println!("{} cheese was eaten", cheese.name);
}
}
fn main()
{
let mut world = World::new();
world.register_system(*UPDATE, eat_cheese);
world.register_observer(on_cheese_removed);
world.create_entity((Cheese { name: "Brie" },));
world.create_entity((Cheese { name: "Parmesan" },));
world.create_entity((Cheese { name: "Gouda" },));
world.step();
world.step();
}
|
