checs

实体-组件-系统库。

示例

这是一个如何使用checs的非常基础的示例。

您可以在examples/basic.rs中找到此示例。使用以下命令运行它：

cargo run --example basic

定义一些组件和一个World来存储它们。

注意：组件只是普通的Rust类型。

struct Position { x: u32, y: u32, }
struct Health(i32);
struct Visible;

use checs::component::ComponentVec;
use checs::Storage;

#[derive(Default, Storage)]
struct Storage {
    positions: ComponentVec<Position>,
    healths: ComponentVec<Health>,
    visibles: ComponentVec<Visible>,
}

let mut world = checs::world::World::<Storage>::new();

使用初始组件创建实体。

// Either manually...
let player = world.spawn();
world.insert(player, Position { x: 0, y: 0 });
world.insert(player, Visible);
world.insert(player, Health(80));

// ...or by using the `spawn` macro.
let obstacle = checs::spawn!(world, Position { x: 1, y: 1 }, Visible);
let trap = checs::spawn!(world, Position { x: 2, y: 1 });
let enemy = checs::spawn!(world, Position { x: 1, y: 4 }, Visible, Health(100));

找到具有某些组件的实体。

use checs::iter::LendingIterator;
use checs::query::IntoQuery;

let ps = &world.storage.positions;
let hs = &mut world.storage.healths;
let vs = &world.storage.visibles;

let query = (ps, hs, vs).into_query();

query.for_each(|(e, (p, h, _v))| {
    h.0 = h.0 - 17;
    println!("{e:?} at ({}, {}) has {} HP.", p.x, p.y, h.0);
});

// Entity(0) is Visible at (0, 0) with 63 HP.
// Entity(3) is Visible at (1, 4) with 83 HP.