# Trait bevy::math::bounding::BoundingVolume

``````pub trait BoundingVolume: Sized {
type Translation: Clone + Copy + PartialEq;
type Rotation: Clone + Copy + PartialEq;
type HalfSize;

Show 14 methods    // Required methods
fn center(&self) -> Self::Translation;
fn half_size(&self) -> Self::HalfSize;
fn visible_area(&self) -> f32;
fn contains(&self, other: &Self) -> bool;
fn merge(&self, other: &Self) -> Self;
fn grow(&self, amount: impl Into<Self::HalfSize>) -> Self;
fn shrink(&self, amount: impl Into<Self::HalfSize>) -> Self;
fn scale_around_center(&self, scale: impl Into<Self::HalfSize>) -> Self;
fn translate_by(&mut self, translation: impl Into<Self::Translation>);
fn rotate_by(&mut self, rotation: impl Into<Self::Rotation>);

// Provided methods
fn transformed_by(
self,
translation: impl Into<Self::Translation>,
rotation: impl Into<Self::Rotation>,
) -> Self { ... }
fn transform_by(
&mut self,
translation: impl Into<Self::Translation>,
rotation: impl Into<Self::Rotation>,
) { ... }
fn translated_by(self, translation: impl Into<Self::Translation>) -> Self { ... }
fn rotated_by(self, rotation: impl Into<Self::Rotation>) -> Self { ... }
}``````
Expand description

A trait that generalizes different bounding volumes. Bounding volumes are simplified shapes that are used to get simpler ways to check for overlapping elements or finding intersections.

This trait supports both 2D and 3D bounding shapes.

## Required Associated Types§

#### type Translation: Clone + Copy + PartialEq

The position type used for the volume. This should be `Vec2` for 2D and `Vec3` for 3D.

#### type Rotation: Clone + Copy + PartialEq

The rotation type used for the volume. This should be `f32` for 2D and `Quat` for 3D.

#### type HalfSize

The type used for the size of the bounding volume. Usually a half size. For example an `f32` radius for a circle, or a `Vec3` with half sizes for x, y and z for a 3D axis-aligned bounding box

## Required Methods§

#### fn center(&self) -> Self::Translation

Returns the center of the bounding volume.

#### fn half_size(&self) -> Self::HalfSize

Returns the half size of the bounding volume.

#### fn visible_area(&self) -> f32

Computes the visible surface area of the bounding volume. This method can be useful to make decisions about merging bounding volumes, using a Surface Area Heuristic.

For 2D shapes this would simply be the area of the shape. For 3D shapes this would usually be half the area of the shape.

#### fn contains(&self, other: &Self) -> bool

Checks if this bounding volume contains another one.

#### fn merge(&self, other: &Self) -> Self

Computes the smallest bounding volume that contains both `self` and `other`.

#### fn grow(&self, amount: impl Into<Self::HalfSize>) -> Self

Increases the size of the bounding volume in each direction by the given amount.

#### fn shrink(&self, amount: impl Into<Self::HalfSize>) -> Self

Decreases the size of the bounding volume in each direction by the given amount.

#### fn scale_around_center(&self, scale: impl Into<Self::HalfSize>) -> Self

Scale the size of the bounding volume around its center by the given amount

#### fn translate_by(&mut self, translation: impl Into<Self::Translation>)

Translates the bounding volume by the given translation.

#### fn rotate_by(&mut self, rotation: impl Into<Self::Rotation>)

Rotates the bounding volume around the origin by the given rotation.

The result is a combination of the original volume and the rotated volume, so it is guaranteed to be either the same size or larger than the original.

## Provided Methods§

#### fn transformed_by( self, translation: impl Into<Self::Translation>, rotation: impl Into<Self::Rotation>, ) -> Self

Transforms the bounding volume by first rotating it around the origin and then applying a translation.

#### fn transform_by( &mut self, translation: impl Into<Self::Translation>, rotation: impl Into<Self::Rotation>, )

Transforms the bounding volume by first rotating it around the origin and then applying a translation.

#### fn translated_by(self, translation: impl Into<Self::Translation>) -> Self

Translates the bounding volume by the given translation.

#### fn rotated_by(self, rotation: impl Into<Self::Rotation>) -> Self

Rotates the bounding volume around the origin by the given rotation.

The result is a combination of the original volume and the rotated volume, so it is guaranteed to be either the same size or larger than the original.

## Object Safety§

This trait is not object safe.

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