# Struct euclid::Rotation2D

``````#[repr(C)]pub struct Rotation2D<T, Src, Dst> {
pub angle: T,
/* private fields */
}``````
Expand description

A transform that can represent rotations in 2d, represented as an angle in radians.

## Fields§

§`angle: T`

## Implementations§

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### impl<T, Src, Dst> Rotation2D<T, Src, Dst>

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#### pub fn new(angle: Angle<T>) -> Self

Creates a rotation from an angle in radians.

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#### pub fn radians(angle: T) -> Self

Creates a rotation from an angle in radians.

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#### pub fn identity() -> Selfwhere T: Zero,

Creates the identity rotation.

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### impl<T: Copy, Src, Dst> Rotation2D<T, Src, Dst>

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#### pub fn cast_unit<Src2, Dst2>(&self) -> Rotation2D<T, Src2, Dst2>

Cast the unit, preserving the numeric value.

##### §Example
``````enum Local {}
enum World {}

enum Local2 {}
enum World2 {}

let to_world: Rotation2D<_, Local, World> = Rotation2D::radians(42);

assert_eq!(to_world.angle, to_world.cast_unit::<Local2, World2>().angle);``````
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#### pub fn to_untyped(&self) -> Rotation2D<T, UnknownUnit, UnknownUnit>

Drop the units, preserving only the numeric value.

##### §Example
``````enum Local {}
enum World {}

let to_world: Rotation2D<_, Local, World> = Rotation2D::radians(42);

assert_eq!(to_world.angle, to_world.to_untyped().angle);``````
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#### pub fn from_untyped(r: &Rotation2D<T, UnknownUnit, UnknownUnit>) -> Self

Tag a unitless value with units.

##### §Example
``````use euclid::UnknownUnit;
enum Local {}
enum World {}

let rot: Rotation2D<_, UnknownUnit, UnknownUnit> = Rotation2D::radians(42);

assert_eq!(rot.angle, Rotation2D::<_, Local, World>::from_untyped(&rot).angle);``````
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### impl<T, Src, Dst> Rotation2D<T, Src, Dst>where T: Copy,

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#### pub fn get_angle(&self) -> Angle<T>

Returns self.angle as a strongly typed `Angle<T>`.

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### impl<T: Float, Src, Dst> Rotation2D<T, Src, Dst>

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#### pub fn to_3d(&self) -> Rotation3D<T, Src, Dst>

Creates a 3d rotation (around the z axis) from this 2d rotation.

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#### pub fn inverse(&self) -> Rotation2D<T, Dst, Src>

Returns the inverse of this rotation.

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#### pub fn then<NewSrc>( &self, other: &Rotation2D<T, NewSrc, Src> ) -> Rotation2D<T, NewSrc, Dst>

Returns a rotation representing the other rotation followed by this rotation.

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#### pub fn transform_point(&self, point: Point2D<T, Src>) -> Point2D<T, Dst>

Returns the given 2d point transformed by this rotation.

The input point must be use the unit Src, and the returned point has the unit Dst.

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#### pub fn transform_vector(&self, vector: Vector2D<T, Src>) -> Vector2D<T, Dst>

Returns the given 2d vector transformed by this rotation.

The input point must be use the unit Src, and the returned point has the unit Dst.

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### impl<T, Src, Dst> Rotation2D<T, Src, Dst>where T: Copy + Add<Output = T> + Sub<Output = T> + Mul<Output = T> + Zero + Trig,

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#### pub fn to_transform(&self) -> Transform2D<T, Src, Dst>

Returns the matrix representation of this rotation.

## Trait Implementations§

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### impl<T: Clone, Src, Dst> Clone for Rotation2D<T, Src, Dst>

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#### fn clone(&self) -> Self

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<'de, T, Src, Dst> Deserialize<'de> for Rotation2D<T, Src, Dst>where T: Deserialize<'de>,

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

Deserialize this value from the given Serde deserializer. Read more
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### impl<T, Src, Dst> Hash for Rotation2D<T, Src, Dst>where T: Hash,

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#### fn hash<H: Hasher>(&self, h: &mut H)

Feeds this value into the given `Hasher`. Read more
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#### fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given `Hasher`. Read more
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### impl<T, Src, Dst> PartialEq for Rotation2D<T, Src, Dst>where T: PartialEq,

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#### fn eq(&self, other: &Self) -> 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<T, Src, Dst> Serialize for Rotation2D<T, Src, Dst>where T: Serialize,

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

Serialize this value into the given Serde serializer. Read more
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## Blanket Implementations§

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### impl<T> Any for Twhere 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> Borrow<T> for Twhere T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for Twhere 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> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for Twhere U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for Twhere T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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