checs

An Entity-Component-System library.

Example

This is a very basic example of how to use checs.

You can find this example at examples/basic.rs. Run it with:

sh cargo run --example basic

Define some components and a World to store them in.

Note: Components are just plain old Rust types.

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

checs::impl_storage!( struct Storage { positions: Position, healths: Health, visibles: Visible, } );

let mut world = world::World::::new(); ```

Create entities with initial components.

```rust let player = world.spawn(); world.put(player, Health(80)); world.put(player, Position { x: 0, y: 0 }); world.put(player, Visible);

let obstacle = world.spawn(); world.put(obstacle, Position { x: 1, y: 1 }); world.put(obstacle, Visible);

let trap = world.spawn(); world.put(trap, Position { x: 2, y: 1 });

let enemy = world.spawn(); world.put(enemy, Health(100)); world.put(enemy, Position { x: 1, y: 4 }); world.put(enemy, Visible); ```

Find the entities that have some components.

```rust use checs::iter::LendingIterator; use checs::query::Join;

let ps = &world.storage.positions; let vs = &world.storage.visibles;

let mut query = (ps, vs).join();

while let Some((e, p, h, v)) = query.next() { h.0 = h.0 - 17; println!("{e:?} is {v:?} at ({}, {})", p.x, p.y); }

// Entity(0) is Visible at (0, 0) // Entity(1) is Visible at (1, 1) // Entity(3) is Visible at (1, 4) ```