# Struct bevy::math::cubic_splines::CubicBezier

``````pub struct CubicBezier<P>where
P: Point,{ /* private fields */ }``````
Expand description

A spline composed of a single cubic Bezier curve.

Useful for user-drawn curves with local control, or animation easing. See `CubicSegment::new_bezier` for use in easing.

#### Interpolation

The curve only passes through the first and last control point in each set of four points. The curve is divided into “segments” by every fourth control point.

#### Tangency

Tangents are manually defined by the two intermediate control points within each set of four points. You can think of the control points the curve passes through as “anchors”, and as the intermediate control points as the anchors displaced along their tangent vectors

#### Continuity

A Bezier curve is at minimum C0 continuous, meaning it has no holes or jumps. Each curve segment is C2, meaning the tangent vector changes smoothly between each set of four control points, but this doesn’t hold at the control points between segments. Making the whole curve C1 or C2 requires moving the intermediate control points to align the tangent vectors between segments, and can result in a loss of local control.

#### Usage

``````let points = [[
vec2(-1.0, -20.0),
vec2(3.0, 2.0),
vec2(5.0, 3.0),
vec2(9.0, 8.0),
]];
let bezier = CubicBezier::new(points).to_curve();
let positions: Vec<_> = bezier.iter_positions(100).collect();``````

## Implementations§

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### impl<P> CubicBezier<P>where P: Point,

#### pub fn new(control_points: impl Into<Vec<[P; 4]>>) -> CubicBezier<P>

Create a new cubic Bezier curve from sets of control points.

## Trait Implementations§

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### impl<P> CubicGenerator<P> for CubicBezier<P>where P: Point,

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#### fn to_curve(&self) -> CubicCurve<P>

Build a `CubicCurve` by computing the interpolation coefficients for each curve segment.

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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

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

Returns the argument unchanged.

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#### fn instrument(self, span: Span) -> Instrumented<Self> ⓘ

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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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> Pointable for T

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#### const ALIGN: usize = _

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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Should always be `Self`
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The type returned in the event of a conversion error.
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Performs the conversion.
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#### type Error = <U as TryFrom<T>>::Error

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Performs the conversion.
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