dbvt_broad_phase2d.rs

extern crate nalgebra as na;

use na::{Isometry2, Vector2};
use ncollide2d::bounding_volume;
use ncollide2d::broad_phase::{BroadPhase, BroadPhaseInterferenceHandler, DBVTBroadPhase};
use ncollide2d::shape::Ball;

struct InterferenceHandler;

impl BroadPhaseInterferenceHandler<i32> for InterferenceHandler {
    fn is_interference_allowed(&mut self, a: &i32, b: &i32) -> bool {
        // Prevent self-collision.
        *a != *b
    }

    fn interference_started(&mut self, _: &i32, _: &i32) {}

    fn interference_stopped(&mut self, _: &i32, _: &i32) {}
}

fn main() {
    /*
     * Create the objects.
     */
    let poss = [
        Isometry2::new(Vector2::new(0.0, 0.0), na::zero()),
        Isometry2::new(Vector2::new(0.0, 0.5), na::zero()),
        Isometry2::new(Vector2::new(0.5, 0.0), na::zero()),
        Isometry2::new(Vector2::new(0.5, 0.5), na::zero()),
    ];

    // We will use the same shape for the four objects.
    let ball = Ball::new(0.5);

    /*
     * Create the broad phase.
     */
    let mut bf = DBVTBroadPhase::new(0.2);

    // First parameter: the object bounding box.
    // Second parameter:  some data (here, the id that identify each object).
    let proxy1 = bf.create_proxy(bounding_volume::aabb(&ball, &poss[0]), 0);
    let proxy2 = bf.create_proxy(bounding_volume::aabb(&ball, &poss[1]), 1);
    let _ = bf.create_proxy(bounding_volume::aabb(&ball, &poss[2]), 2);
    let _ = bf.create_proxy(bounding_volume::aabb(&ball, &poss[3]), 3);

    // Update the broad phase.
    bf.update(&mut InterferenceHandler);

    assert!(bf.num_interferences() == 6);

    // Remove two objects.
    bf.remove(&[proxy1, proxy2], &mut |_, _| {});

    // Update the broad phase.
    bf.update(&mut InterferenceHandler);

    assert!(bf.num_interferences() == 1)
}