time_of_impact_query2d.rs

extern crate nalgebra as na;

use na::{Isometry2, Vector2};
use ncollide2d::query;
use ncollide2d::shape::{Ball, Cuboid};

fn main() {
    let cuboid = Cuboid::new(Vector2::new(1.0, 1.0));
    let ball = Ball::new(1.0);

    let cuboid_pos = Isometry2::identity();
    let ball_pos_intersecting = Isometry2::new(Vector2::new(1.0, 1.0), na::zero());
    let ball_pos_will_touch = Isometry2::new(Vector2::new(2.0, 2.0), na::zero());
    let ball_pos_wont_touch = Isometry2::new(Vector2::new(3.0, 3.0), na::zero());

    let box_vel1 = Vector2::new(-1.0, 1.0);
    let box_vel2 = Vector2::new(1.0, 1.0);

    let ball_vel1 = Vector2::new(2.0, 2.0);
    let ball_vel2 = Vector2::new(-0.5, -0.5);

    let toi_intersecting = query::time_of_impact(
        &query::DefaultTOIDispatcher,
        &ball_pos_intersecting,
        &ball_vel1,
        &ball,
        &cuboid_pos,
        &box_vel1,
        &cuboid,
        std::f64::MAX,
        0.0,
    )
    .unwrap();
    let toi_will_touch = query::time_of_impact(
        &query::DefaultTOIDispatcher,
        &ball_pos_will_touch,
        &ball_vel2,
        &ball,
        &cuboid_pos,
        &box_vel2,
        &cuboid,
        std::f64::MAX,
        0.0,
    )
    .unwrap();
    let toi_wont_touch = query::time_of_impact(
        &query::DefaultTOIDispatcher,
        &ball_pos_wont_touch,
        &ball_vel1,
        &ball,
        &cuboid_pos,
        &box_vel1,
        &cuboid,
        std::f64::MAX,
        0.0,
    )
    .unwrap();

    assert_eq!(toi_intersecting.map(|toi| toi.toi), Some(0.0));
    println!("Toi: {:?}", toi_will_touch);
    assert!(toi_will_touch.is_some() && toi_will_touch.unwrap().toi > 0.0);
    assert_eq!(toi_wont_touch.map(|toi| toi.toi), None);
}