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use na::Real;
use math::{Point, Isometry};
/// Traits of objects having a bounding volume.
pub trait HasBoundingVolume<N: Real, BV> {
/// The bounding volume of `self` transformed by `m`.
fn bounding_volume(&self, m: &Isometry<N>) -> BV;
}
/// Trait of bounding volumes.
///
/// Bounding volumes are coarse approximations of shapes. It usually have constant time
/// intersection, inclusion test. Two bounding volume must also be mergeable into a bigger bounding
/// volume.
pub trait BoundingVolume<N: Real> {
// FIXME: keep that ? What about non-spacial bounding volumes (e.g. bounding cones, curvature
// bounds, etc.) ?
/// Returns a point inside of this bounding volume. This is ideally its center.
fn center(&self) -> Point<N>;
/// Checks if this bounding volume intersect with another one.
fn intersects(&self, &Self) -> bool;
/// Checks if this bounding volume contains another one.
fn contains(&self, &Self) -> bool;
/// Merges this bounding volume with another one. The merge is done in-place.
fn merge(&mut self, &Self);
/// Merges this bounding volume with another one.
fn merged(&self, &Self) -> Self;
/// Enlarges this bounding volume.
fn loosen(&mut self, N);
/// Creates a new, enlarged version, of this bounding volume.
fn loosened(&self, N) -> Self;
/// Tighten this bounding volume.
fn tighten(&mut self, N);
/// Creates a new, tightened version, of this bounding volume.
fn tightened(&self, N) -> Self;
}