Struct euclid::Scale

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#[repr(C)]
pub struct Scale<T, Src, Dst>(pub T, _);
Expand description

A scaling factor between two different units of measurement.

This is effectively a type-safe float, intended to be used in combination with other types like length::Length to enforce conversion between systems of measurement at compile time.

Src and Dst represent the units before and after multiplying a value by a Scale. They may be types without values, such as empty enums. For example:

use euclid::Scale;
use euclid::Length;
enum Mm {};
enum Inch {};

let mm_per_inch: Scale<f32, Inch, Mm> = Scale::new(25.4);

let one_foot: Length<f32, Inch> = Length::new(12.0);
let one_foot_in_mm: Length<f32, Mm> = one_foot * mm_per_inch;

Tuple Fields§

§0: T

Implementations§

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impl<T, Src, Dst> Scale<T, Src, Dst>

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pub const fn new(x: T) -> Self

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pub fn identity() -> Self
where T: One,

Creates an identity scale (1.0).

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pub fn transform_point(self, point: Point2D<T, Src>) -> Point2D<T::Output, Dst>
where T: Copy + Mul,

Returns the given point transformed by this scale.

§Example
use euclid::{Scale, point2};
enum Mm {};
enum Cm {};

let to_mm: Scale<i32, Cm, Mm> = Scale::new(10);

assert_eq!(to_mm.transform_point(point2(42, -42)), point2(420, -420));
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pub fn transform_point3d( self, point: Point3D<T, Src>, ) -> Point3D<T::Output, Dst>
where T: Copy + Mul,

Returns the given point transformed by this scale.

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pub fn transform_vector(self, vec: Vector2D<T, Src>) -> Vector2D<T::Output, Dst>
where T: Copy + Mul,

Returns the given vector transformed by this scale.

§Example
use euclid::{Scale, vec2};
enum Mm {};
enum Cm {};

let to_mm: Scale<i32, Cm, Mm> = Scale::new(10);

assert_eq!(to_mm.transform_vector(vec2(42, -42)), vec2(420, -420));
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pub fn transform_size(self, size: Size2D<T, Src>) -> Size2D<T::Output, Dst>
where T: Copy + Mul,

Returns the given size transformed by this scale.

§Example
use euclid::{Scale, size2};
enum Mm {};
enum Cm {};

let to_mm: Scale<i32, Cm, Mm> = Scale::new(10);

assert_eq!(to_mm.transform_size(size2(42, -42)), size2(420, -420));
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pub fn transform_rect(self, rect: &Rect<T, Src>) -> Rect<T::Output, Dst>
where T: Copy + Mul,

Returns the given rect transformed by this scale.

§Example
use euclid::{Scale, rect};
enum Mm {};
enum Cm {};

let to_mm: Scale<i32, Cm, Mm> = Scale::new(10);

assert_eq!(to_mm.transform_rect(&rect(1, 2, 42, -42)), rect(10, 20, 420, -420));
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pub fn transform_box2d(self, b: &Box2D<T, Src>) -> Box2D<T::Output, Dst>
where T: Copy + Mul,

Returns the given box transformed by this scale.

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pub fn transform_box3d(self, b: &Box3D<T, Src>) -> Box3D<T::Output, Dst>
where T: Copy + Mul,

Returns the given box transformed by this scale.

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pub fn is_identity(self) -> bool
where T: PartialEq + One,

Returns true if this scale has no effect.

§Example
use euclid::Scale;
use euclid::num::One;
enum Mm {};
enum Cm {};

let cm_per_mm: Scale<f32, Mm, Cm> = Scale::new(0.1);
let mm_per_mm: Scale<f32, Mm, Mm> = Scale::new(1.0);

assert_eq!(cm_per_mm.is_identity(), false);
assert_eq!(mm_per_mm.is_identity(), true);
assert_eq!(mm_per_mm, Scale::one());
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pub fn get(self) -> T

Returns the underlying scalar scale factor.

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pub fn inverse(self) -> Scale<T::Output, Dst, Src>
where T: One + Div,

The inverse Scale (1.0 / self).

§Example
use euclid::Scale;
enum Mm {};
enum Cm {};

let cm_per_mm: Scale<f32, Cm, Mm> = Scale::new(0.1);

assert_eq!(cm_per_mm.inverse(), Scale::new(10.0));
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impl<T: PartialOrd, Src, Dst> Scale<T, Src, Dst>

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pub fn min(self, other: Self) -> Self

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pub fn max(self, other: Self) -> Self

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pub fn clamp(self, start: Self, end: Self) -> Self
where T: Copy,

Returns the point each component of which clamped by corresponding components of start and end.

Shortcut for self.max(start).min(end).

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impl<T: NumCast, Src, Dst> Scale<T, Src, Dst>

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pub fn cast<NewT: NumCast>(self) -> Scale<NewT, Src, Dst>

Cast from one numeric representation to another, preserving the units.

§Panics

If the source value cannot be represented by the target type NewT, then method panics. Use try_cast if that must be case.

§Example
use euclid::Scale;
enum Mm {};
enum Cm {};

let to_mm: Scale<i32, Cm, Mm> = Scale::new(10);

assert_eq!(to_mm.cast::<f32>(), Scale::new(10.0));

That conversion will panic, because i32 not enough to store such big numbers:

use euclid::Scale;
enum Mm {};// millimeter = 10^-2 meters
enum Em {};// exameter   = 10^18 meters

// Panics
let to_em: Scale<i32, Mm, Em> = Scale::new(10e20).cast();
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pub fn try_cast<NewT: NumCast>(self) -> Option<Scale<NewT, Src, Dst>>

Fallible cast from one numeric representation to another, preserving the units. If the source value cannot be represented by the target type NewT, then None is returned.

§Example
use euclid::Scale;
enum Mm {};
enum Cm {};
enum Em {};// Exameter = 10^18 meters

let to_mm: Scale<i32, Cm, Mm> = Scale::new(10);
let to_em: Scale<f32, Mm, Em> = Scale::new(10e20);

assert_eq!(to_mm.try_cast::<f32>(), Some(Scale::new(10.0)));
// Integer to small to store that number
assert_eq!(to_em.try_cast::<i32>(), None);

Trait Implementations§

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impl<T: Add, Src, Dst> Add for Scale<T, Src, Dst>

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type Output = Scale<<T as Add>::Output, Src, Dst>

The resulting type after applying the + operator.
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fn add(self, other: Scale<T, Src, Dst>) -> Self::Output

Performs the + operation. Read more
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impl<T: Clone, Src, Dst> Clone for Scale<T, Src, Dst>

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fn clone(&self) -> Scale<T, Src, Dst>

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<T: Debug, Src, Dst> Debug for Scale<T, Src, Dst>

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

Formats the value using the given formatter. Read more
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impl<T: Default, Src, Dst> Default for Scale<T, Src, Dst>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<Src, Dst, T: Div> Div<Scale<T, Src, Dst>> for Length<T, Dst>

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type Output = Length<<T as Div>::Output, Src>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, Src, Dst>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Box2D<T, U2>

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type Output = Box2D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Box3D<T, U2>

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type Output = Box3D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Point2D<T, U2>

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type Output = Point2D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Point3D<T, U2>

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type Output = Point3D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Rect<T, U2>

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type Output = Rect<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for SideOffsets2D<T, U2>

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type Output = SideOffsets2D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Size2D<T, U2>

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type Output = Size2D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Size3D<T, U2>

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type Output = Size3D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Vector2D<T, U2>

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type Output = Vector2D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Vector3D<T, U2>

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type Output = Vector3D<<T as Div>::Output, U1>

The resulting type after applying the / operator.
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the / operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Box2D<T, U>

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fn div_assign(&mut self, scale: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Box3D<T, U>

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fn div_assign(&mut self, scale: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Point2D<T, U>

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fn div_assign(&mut self, scale: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Point3D<T, U>

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fn div_assign(&mut self, scale: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Rect<T, U>

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fn div_assign(&mut self, scale: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for SideOffsets2D<T, U>

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fn div_assign(&mut self, other: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Size2D<T, U>

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fn div_assign(&mut self, other: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Size3D<T, U>

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fn div_assign(&mut self, other: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Vector2D<T, U>

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fn div_assign(&mut self, scale: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Vector3D<T, U>

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fn div_assign(&mut self, scale: Scale<T, U, U>)

Performs the /= operation. Read more
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impl<T: Hash, Src, Dst> Hash for Scale<T, Src, Dst>

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fn hash<H: Hasher>(&self, state: &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: Mul, A, B, C> Mul<Scale<T, B, C>> for Scale<T, A, B>

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type Output = Scale<<T as Mul>::Output, A, C>

The resulting type after applying the * operator.
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fn mul(self, other: Scale<T, B, C>) -> Self::Output

Performs the * operation. Read more
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impl<Src, Dst, T: Mul> Mul<Scale<T, Src, Dst>> for Length<T, Src>

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type Output = Length<<T as Mul>::Output, Dst>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, Src, Dst>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Box2D<T, U1>

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type Output = Box2D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Box3D<T, U1>

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type Output = Box3D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Point2D<T, U1>

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type Output = Point2D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Point3D<T, U1>

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type Output = Point3D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Rect<T, U1>

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type Output = Rect<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for SideOffsets2D<T, U1>

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type Output = SideOffsets2D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Size2D<T, U1>

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type Output = Size2D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Size3D<T, U1>

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type Output = Size3D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Vector2D<T, U1>

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type Output = Vector2D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Vector3D<T, U1>

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type Output = Vector3D<<T as Mul>::Output, U2>

The resulting type after applying the * operator.
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output

Performs the * operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Box2D<T, U>

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fn mul_assign(&mut self, scale: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Box3D<T, U>

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fn mul_assign(&mut self, scale: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Point2D<T, U>

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fn mul_assign(&mut self, scale: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Point3D<T, U>

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fn mul_assign(&mut self, scale: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Rect<T, U>

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fn mul_assign(&mut self, scale: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for SideOffsets2D<T, U>

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fn mul_assign(&mut self, other: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Size2D<T, U>

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fn mul_assign(&mut self, other: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Size3D<T, U>

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fn mul_assign(&mut self, other: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Vector2D<T, U>

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fn mul_assign(&mut self, scale: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Vector3D<T, U>

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fn mul_assign(&mut self, scale: Scale<T, U, U>)

Performs the *= operation. Read more
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impl<T: One, Src, Dst> One for Scale<T, Src, Dst>

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fn one() -> Self

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impl<T: Ord, Src, Dst> Ord for Scale<T, Src, Dst>

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fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl<T: PartialEq, Src, Dst> PartialEq for Scale<T, Src, Dst>

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fn eq(&self, other: &Scale<T, Src, Dst>) -> bool

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T: PartialOrd, Src, Dst> PartialOrd for Scale<T, Src, Dst>

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fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<T: Sub, Src, Dst> Sub for Scale<T, Src, Dst>

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type Output = Scale<<T as Sub>::Output, Src, Dst>

The resulting type after applying the - operator.
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fn sub(self, other: Scale<T, Src, Dst>) -> Self::Output

Performs the - operation. Read more
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impl<T: Copy, Src, Dst> Copy for Scale<T, Src, Dst>

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impl<T: Eq, Src, Dst> Eq for Scale<T, Src, Dst>

Auto Trait Implementations§

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impl<T, Src, Dst> Freeze for Scale<T, Src, Dst>
where T: Freeze,

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impl<T, Src, Dst> RefUnwindSafe for Scale<T, Src, Dst>

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impl<T, Src, Dst> Send for Scale<T, Src, Dst>
where T: Send, Src: Send, Dst: Send,

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impl<T, Src, Dst> Sync for Scale<T, Src, Dst>
where T: Sync, Src: Sync, Dst: Sync,

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impl<T, Src, Dst> Unpin for Scale<T, Src, Dst>
where T: Unpin, Src: Unpin, Dst: Unpin,

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impl<T, Src, Dst> UnwindSafe for Scale<T, Src, Dst>
where T: UnwindSafe, Src: UnwindSafe, Dst: UnwindSafe,

Blanket Implementations§

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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> 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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impl<T> BorrowMut<T> for T
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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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 T
where 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 T
where 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 T
where 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 T
where 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.