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
|
use ecs::event::start::Start as StartEvent;
use ecs::{Component, Query, World};
#[derive(Component)]
struct SomeData
{
num: u64,
}
#[derive(Component)]
struct Greeting
{
greeting: String,
}
fn say_hello(query: Query<(SomeData, Greeting)>)
{
for (data, greeting) in &query {
println!("{}: {}", greeting.greeting, data.num);
}
}
fn main()
{
let mut world = World::new();
world.register_system(StartEvent, say_hello);
world.create_entity((
SomeData { num: 987_654 },
Greeting {
greeting: "Good afternoon".to_string(),
},
));
world.create_entity((
SomeData { num: 345 },
Greeting { greeting: "Good evening".to_string() },
));
world.prepare();
world.emit(StartEvent);
}
|
