Expand description
Bod2D for Rust
You won’t find a lot of information about Box2D itself here, look at the official website instead.
World
use wrapped2d::b2;
use wrapped2d::user_data::NoUserData;
let gravity = b2::Vec2 { x: 0., y: -10. };
let world = b2::World::<NoUserData>::new(&gravity);Handles
Bodies, fixtures and joints are accessed through handles and
their borrowing is dynamically checked by RefCells.
let mut def = b2::BodyDef {
body_type: b2::BodyType::Dynamic,
position: b2::Vec2 { x: 10., y: 10. },
.. b2::BodyDef::new()
};
let handle = world.create_body(&def);
let mut body = world.body_mut(handle);
let shape = b2::PolygonShape::new_box(0.5, 0.5);
let handle = body.create_fast_fixture(&shape, 2.);
let fixture = body.fixture(handle);User Data
You can provide a unit struct to specify the user data types that will be used for bodies, joints and fixtures. For example:
use wrapped2d::b2;
use wrapped2d::user_data::*;
pub type ObjectId = u64;
pub struct CustomUserData;
impl UserDataTypes for CustomUserData {
type BodyData = Option<ObjectId>;
type JointData = ();
type FixtureData = FixtureKind;
}
pub type World = b2::World<CustomUserData>;
pub enum FixtureKind {
Wood,
Metal,
}
fn main() {
let mut world = World::new(&b2::Vec2 { x: 0., y: -10. });
let def = b2::BodyDef {
body_type: b2::BodyType::Dynamic,
position: b2::Vec2 { x: 0., y: -15. },
..b2::BodyDef::new()
};
let h1 = world.create_body(&def); // will use `Default` user data (`None` here)
let h2 = world.create_body_with(&def, Some(2)); // specifying user data for the body
let user_data = world.body(h2).user_data(); // access the body user data
}