Struct bevy::math::primitives::CircularSegment

pub struct CircularSegment {
    pub arc: Arc2d,
}
Expand description

A primitive representing a circular segment: the area enclosed by the arc of a circle and its chord (the line between its endpoints).

The segment is drawn starting from Vec2::Y, extending equally on either side. To orient the segment differently, apply a rotation. The segment is drawn with the center of its circle at the origin Vec2::ZERO. When positioning a segment, the apothem function may be particularly useful.

Warning: Circular segments with negative angle or radius, or with angle greater than an entire circle, are not officially supported. We recommend normalizing circular segments to have an angle in [0, 2π].

Fields§

§arc: Arc2d

The arc defining the segment

Implementations§

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impl CircularSegment

pub fn new(radius: f32, angle: f32) -> CircularSegment

Create a new CircularSegment from a radius, and an angle

Examples found in repository?
examples/2d/2d_shapes.rs (line 28)
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fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    commands.spawn(Camera2dBundle::default());

    let shapes = [
        Mesh2dHandle(meshes.add(Circle { radius: 50.0 })),
        Mesh2dHandle(meshes.add(CircularSector::new(50.0, 1.0))),
        Mesh2dHandle(meshes.add(CircularSegment::new(50.0, 1.25))),
        Mesh2dHandle(meshes.add(Ellipse::new(25.0, 50.0))),
        Mesh2dHandle(meshes.add(Annulus::new(25.0, 50.0))),
        Mesh2dHandle(meshes.add(Capsule2d::new(25.0, 50.0))),
        Mesh2dHandle(meshes.add(Rhombus::new(75.0, 100.0))),
        Mesh2dHandle(meshes.add(Rectangle::new(50.0, 100.0))),
        Mesh2dHandle(meshes.add(RegularPolygon::new(50.0, 6))),
        Mesh2dHandle(meshes.add(Triangle2d::new(
            Vec2::Y * 50.0,
            Vec2::new(-50.0, -50.0),
            Vec2::new(50.0, -50.0),
        ))),
    ];
    let num_shapes = shapes.len();

    for (i, shape) in shapes.into_iter().enumerate() {
        // Distribute colors evenly across the rainbow.
        let color = Color::hsl(360. * i as f32 / num_shapes as f32, 0.95, 0.7);

        commands.spawn(MaterialMesh2dBundle {
            mesh: shape,
            material: materials.add(color),
            transform: Transform::from_xyz(
                // Distribute shapes from -X_EXTENT/2 to +X_EXTENT/2.
                -X_EXTENT / 2. + i as f32 / (num_shapes - 1) as f32 * X_EXTENT,
                0.0,
                0.0,
            ),
            ..default()
        });
    }

    commands.spawn(
        TextBundle::from_section("Press space to toggle wireframes", TextStyle::default())
            .with_style(Style {
                position_type: PositionType::Absolute,
                top: Val::Px(12.0),
                left: Val::Px(12.0),
                ..default()
            }),
    );
}

pub fn from_radians(radius: f32, angle: f32) -> CircularSegment

Create a new CircularSegment from a radius and an angle in radians.

pub fn from_degrees(radius: f32, angle: f32) -> CircularSegment

Create a new CircularSegment from a radius and an angle in degrees.

pub fn from_turns(radius: f32, fraction: f32) -> CircularSegment

Create a new CircularSegment from a radius and a number of turns of a circle.

For instance, 0.5 turns is a semicircle.

Examples found in repository?
examples/2d/mesh2d_arcs.rs (line 80)
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fn setup(
    mut commands: Commands,
    asset_server: Res<AssetServer>,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    let material = materials.add(asset_server.load("branding/icon.png"));

    commands.spawn(Camera2dBundle {
        camera: Camera {
            clear_color: ClearColorConfig::Custom(DARK_SLATE_GREY.into()),
            ..default()
        },
        ..default()
    });

    const UPPER_Y: f32 = 50.0;
    const LOWER_Y: f32 = -50.0;
    const FIRST_X: f32 = -450.0;
    const OFFSET: f32 = 100.0;
    const NUM_SLICES: i32 = 8;

    // This draws NUM_SLICES copies of the Bevy logo as circular sectors and segments,
    // with successively larger angles up to a complete circle.
    for i in 0..NUM_SLICES {
        let fraction = (i + 1) as f32 / NUM_SLICES as f32;

        let sector = CircularSector::from_turns(40.0, fraction);
        // We want to rotate the circular sector so that the sectors appear clockwise from north.
        // We must rotate it both in the Transform and in the mesh's UV mappings.
        let sector_angle = -sector.half_angle();
        let sector_mesh =
            CircularSectorMeshBuilder::new(sector).uv_mode(CircularMeshUvMode::Mask {
                angle: sector_angle,
            });
        commands.spawn((
            MaterialMesh2dBundle {
                mesh: meshes.add(sector_mesh).into(),
                material: material.clone(),
                transform: Transform {
                    translation: Vec3::new(FIRST_X + OFFSET * i as f32, 2.0 * UPPER_Y, 0.0),
                    rotation: Quat::from_rotation_z(sector_angle),
                    ..default()
                },
                ..default()
            },
            DrawBounds(sector),
        ));

        let segment = CircularSegment::from_turns(40.0, fraction);
        // For the circular segment, we will draw Bevy charging forward, which requires rotating the
        // shape and texture by 90 degrees.
        //
        // Note that this may be unintuitive; it may feel like we should rotate the texture by the
        // opposite angle to preserve the orientation of Bevy. But the angle is not the angle of the
        // texture itself, rather it is the angle at which the vertices are mapped onto the texture.
        // so it is the negative of what you might otherwise expect.
        let segment_angle = -FRAC_PI_2;
        let segment_mesh =
            CircularSegmentMeshBuilder::new(segment).uv_mode(CircularMeshUvMode::Mask {
                angle: -segment_angle,
            });
        commands.spawn((
            MaterialMesh2dBundle {
                mesh: meshes.add(segment_mesh).into(),
                material: material.clone(),
                transform: Transform {
                    translation: Vec3::new(FIRST_X + OFFSET * i as f32, LOWER_Y, 0.0),
                    rotation: Quat::from_rotation_z(segment_angle),
                    ..default()
                },
                ..default()
            },
            DrawBounds(segment),
        ));
    }
}

pub fn half_angle(&self) -> f32

Get the half-angle of the segment

pub fn angle(&self) -> f32

Get the angle of the segment

pub fn radius(&self) -> f32

Get the radius of the segment

pub fn arc_length(&self) -> f32

Get the length of the arc defining the segment

pub fn half_chord_length(&self) -> f32

Get half the length of the segment’s base, also known as its chord

pub fn chord_length(&self) -> f32

Get the length of the segment’s base, also known as its chord

pub fn chord_midpoint(&self) -> Vec2

Get the midpoint of the segment’s base, also known as its chord

pub fn apothem(&self) -> f32

Get the length of the apothem of this segment, which is the signed distance between the segment and the center of its circle

See Arc2d::apothem

pub fn sagitta(&self) -> f32

Get the length of the sagitta of this segment, also known as its height

See Arc2d::sagitta

pub fn area(&self) -> f32

Returns the area of this segment

Trait Implementations§

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impl Bounded2d for CircularSegment

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fn aabb_2d(&self, translation: Vec2, rotation: impl Into<Rot2>) -> Aabb2d

Get an axis-aligned bounding box for the shape with the given translation and rotation. The rotation is in radians, counterclockwise, with 0 meaning no rotation.
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fn bounding_circle( &self, translation: Vec2, rotation: impl Into<Rot2>, ) -> BoundingCircle

Get a bounding circle for the shape The rotation is in radians, counterclockwise, with 0 meaning no rotation.
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impl Clone for CircularSegment

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fn clone(&self) -> CircularSegment

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CircularSegment

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Default for CircularSegment

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fn default() -> CircularSegment

Returns the default CircularSegment with radius 0.5 and covering a third of a circle

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impl<'de> Deserialize<'de> for CircularSegment

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fn deserialize<__D>( __deserializer: __D, ) -> Result<CircularSegment, <__D as Deserializer<'de>>::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl From<Arc2d> for CircularSegment

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fn from(arc: Arc2d) -> CircularSegment

Converts to this type from the input type.
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impl From<CircularSegment> for Mesh

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fn from(segment: CircularSegment) -> Mesh

Converts this sector into a Mesh using a default CircularSegmentMeshBuilder.

See the documentation of CircularSegmentMeshBuilder for more details.

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impl FromReflect for CircularSegment
where CircularSegment: Any + Send + Sync, Arc2d: FromReflect + TypePath + RegisterForReflection,

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fn from_reflect(reflect: &(dyn Reflect + 'static)) -> Option<CircularSegment>

Constructs a concrete instance of Self from a reflected value.
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fn take_from_reflect( reflect: Box<dyn Reflect>, ) -> Result<Self, Box<dyn Reflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails. Read more
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impl GetTypeRegistration for CircularSegment
where CircularSegment: Any + Send + Sync, Arc2d: FromReflect + TypePath + RegisterForReflection,

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fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.
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fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type. Read more
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impl<'w, 's, Config, Clear> GizmoPrimitive2d<CircularSegment> for Gizmos<'w, 's, Config, Clear>
where Config: GizmoConfigGroup, Clear: 'static + Send + Sync,

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type Output<'a> = () where Gizmos<'w, 's, Config, Clear>: 'a

The output of primitive_2d. This is a builder to set non-default values.
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fn primitive_2d( &mut self, primitive: &CircularSegment, position: Vec2, angle: f32, color: impl Into<Color>, ) -> <Gizmos<'w, 's, Config, Clear> as GizmoPrimitive2d<CircularSegment>>::Output<'_>

Renders a 2D primitive with its associated details.
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impl Meshable for CircularSegment

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type Output = CircularSegmentMeshBuilder

The output of Self::mesh. This will be a MeshBuilder used for creating a Mesh.
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fn mesh(&self) -> <CircularSegment as Meshable>::Output

Creates a Mesh for a shape.
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impl PartialEq for CircularSegment

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fn eq(&self, other: &CircularSegment) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Reflect for CircularSegment
where CircularSegment: Any + Send + Sync, Arc2d: FromReflect + TypePath + RegisterForReflection,

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fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value. Read more
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fn into_any(self: Box<CircularSegment>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.
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fn as_any(&self) -> &(dyn Any + 'static)

Returns the value as a &dyn Any.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the value as a &mut dyn Any.
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fn into_reflect(self: Box<CircularSegment>) -> Box<dyn Reflect>

Casts this type to a boxed reflected value.
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fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a reflected value.
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fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable reflected value.
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fn clone_value(&self) -> Box<dyn Reflect>

Clones the value as a Reflect trait object. Read more
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fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value. Read more
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fn try_apply( &mut self, value: &(dyn Reflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value. Read more
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fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type. Read more
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fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type. Read more
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fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type. Read more
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fn reflect_owned(self: Box<CircularSegment>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type. Read more
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fn reflect_partial_eq(&self, value: &(dyn Reflect + 'static)) -> Option<bool>

Returns a “partial equality” comparison result. Read more
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fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Debug formatter for the value. Read more
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fn apply(&mut self, value: &(dyn Reflect + 'static))

Applies a reflected value to this value. Read more
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fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type). Read more
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fn serializable(&self) -> Option<Serializable<'_>>

Returns a serializable version of the value. Read more
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fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type. Read more
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impl Serialize for CircularSegment

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fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Struct for CircularSegment
where CircularSegment: Any + Send + Sync, Arc2d: FromReflect + TypePath + RegisterForReflection,

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fn field(&self, name: &str) -> Option<&(dyn Reflect + 'static)>

Returns a reference to the value of the field named name as a &dyn Reflect.
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fn field_mut(&mut self, name: &str) -> Option<&mut (dyn Reflect + 'static)>

Returns a mutable reference to the value of the field named name as a &mut dyn Reflect.
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fn field_at(&self, index: usize) -> Option<&(dyn Reflect + 'static)>

Returns a reference to the value of the field with index index as a &dyn Reflect.
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fn field_at_mut(&mut self, index: usize) -> Option<&mut (dyn Reflect + 'static)>

Returns a mutable reference to the value of the field with index index as a &mut dyn Reflect.
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fn name_at(&self, index: usize) -> Option<&str>

Returns the name of the field with index index.
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fn field_len(&self) -> usize

Returns the number of fields in the struct.
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fn iter_fields(&self) -> FieldIter<'_>

Returns an iterator over the values of the reflectable fields for this struct.
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fn clone_dynamic(&self) -> DynamicStruct

Clones the struct into a DynamicStruct.
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impl TypePath for CircularSegment

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fn type_path() -> &'static str

Returns the fully qualified path of the underlying type. Read more
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fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type. Read more
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fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous. Read more
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fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous. Read more
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fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous. Read more
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impl Typed for CircularSegment
where CircularSegment: Any + Send + Sync, Arc2d: FromReflect + TypePath + RegisterForReflection,

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fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.
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impl Copy for CircularSegment

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impl Primitive2d for CircularSegment

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impl StructuralPartialEq for CircularSegment

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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where T: TypePath,

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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fn from_sample_(s: S) -> S

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impl<T> FromWorld for T
where T: Default,

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fn from_world(_world: &mut World) -> T

Creates Self using data from the given World.
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where T: Reflect,

Returns a reference to the value of the field named name, downcast to T.
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Returns a mutable reference to the value of the field named name, downcast to T.
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Calls U::from(self).

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impl<T> ConditionalSend for T
where T: Send,

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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,

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impl<S, T> Duplex<S> for T
where T: FromSample<S> + ToSample<S>,

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impl<T> Settings for T
where T: 'static + Send + Sync,

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impl<T> WasmNotSend for T
where T: Send,

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impl<T> WasmNotSendSync for T
where T: WasmNotSend + WasmNotSync,

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impl<T> WasmNotSync for T
where T: Sync,