Struct physics2d::Transform

pub struct Transform {
    pub position: Vec2,
    // some fields omitted
}

Fields

position: Vec2

Methods

impl Transform

fn new(position: Vec2, rotation: f32) -> Transform

fn rotation(&self) -> f32

fn set_rotation(&mut self, rotation: f32)

fn world_pos(&self, local_pos: &Vec2) -> Vec2

Returns the world space position for the given local space position with respect to this Transform.

The local space position is first rotated by the world space rotation matrix and then translated by the world space position.

Examples

let t = Transform::new(Vec2::new(1.0, 2.0), math::PI / 2.0);

assert_eq!(t.world_pos(&Vec2::ZERO), Vec2::new(1.0, 2.0));
assert_eq!(t.world_pos(&Vec2::new(1.0, 1.0)), Vec2::new(0.0, 3.0));

fn world_dir(&self, local_dir: &Vec2) -> Vec2

Returns the world space direction for the given local space direction with respect to this Transform.

The local space direction is rotated by the world space rotation matrix.

Examples

let t = Transform::new(Vec2::new(1000.01, 333.333), math::PI / 2.0);

assert!((t.world_dir(&Vec2::RIGHT) - Vec2::UP).len() < 1e-07);

fn local_pos(&self, world_pos: &Vec2) -> Vec2

Returns the local space position with respect to this Transform for the given world space position.

The world space position is first brought relative to the local origin and then rotated to be relative to the local space rotation.

Examples

let t = Transform::new(Vec2::new(1.0, 2.0), math::PI / 2.0);

assert_eq!(t.local_pos(&Vec2::new(1.0, 2.0)), Vec2::ZERO);
assert!((t.local_pos(&Vec2::new(1.0, 3.0)) - Vec2::new(1.0, 0.0)).len() < 1e-07);

fn local_dir(&self, world_dir: &Vec2) -> Vec2

Returns the local space direction with respect to this Transform for the given world space direction.

The world space direction is rotated to be relative to the local space rotation.

Examples

let t = Transform::new(Vec2::new(1000.01, 333.333), math::PI / 2.0);

assert!((t.local_dir(&Vec2::UP) - Vec2::RIGHT).len() < 1e-07);