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use ecs::event::Event;
use ecs::{Component, Query, World};
#[derive(Debug, Component)]
struct PettingCapacity
{
capacity_left: u32,
}
#[derive(Debug, Clone, Copy, Component)]
enum Aggressivity
{
High,
Medium,
Low,
}
#[derive(Debug, Component)]
pub struct CatName
{
name: String,
}
fn pet_cats(query: Query<(CatName, PettingCapacity, Option<Aggressivity>)>)
{
for (cat_name, mut petting_capacity, aggressivity) in &query {
let Some(aggressivity) = aggressivity else {
println!("Aggressivity of cat {} is unknown. Skipping", cat_name.name);
continue;
};
if let Aggressivity::High = *aggressivity {
println!("Cat {} is aggressive. Skipping", cat_name.name);
continue;
}
if petting_capacity.capacity_left == 0 {
println!(
"Cat {} have had enough of being petted. Skipping",
cat_name.name
);
continue;
}
println!("Petting cat {}", cat_name.name);
petting_capacity.capacity_left -= 1;
}
}
#[derive(Debug)]
struct PettingTime;
impl Event for PettingTime {}
fn main()
{
let mut world = World::new();
world.register_system(PettingTime, pet_cats);
world.create_entity((
CatName { name: "Jasper".to_string() },
Aggressivity::Medium,
PettingCapacity { capacity_left: 5 },
));
world.create_entity((
CatName { name: "Otto".to_string() },
PettingCapacity { capacity_left: 9 },
));
world.create_entity((
CatName { name: "Carrie".to_string() },
PettingCapacity { capacity_left: 2 },
Aggressivity::High,
));
world.create_entity((
CatName { name: "Tommy".to_string() },
PettingCapacity { capacity_left: 1 },
Aggressivity::Low,
));
world.prepare();
world.emit(PettingTime);
}
|
