Enum Curve 

pub enum Curve {
    Linear,
    EaseIn,
    EaseOut,
    EaseInOut,
    Emphasized,
    Cubic(f64, f64, f64, f64),
}

The animation vocabulary: the shell-fed frame clock (FrameTime) plus the pure easing/interpolation/spring math a widget or app advances it through, flat-re-exported from frust-core::anim. Time enters from the shell during paint (PaintCtx::frame_time); nothing here reads a clock. An easing curve mapping normalized time t ∈ [0, 1] to eased progress ∈ [0, 1].

The named variants are the CSS timing functions plus Material 3’s Emphasized; Curve::Cubic is a general cubic-Bézier. t is clamped first.

Variants

Linear

t unchanged.

EaseIn

CSS ease-in — cubic-bezier(0.42, 0, 1, 1).

EaseOut

CSS ease-out — cubic-bezier(0, 0, 0.58, 1).

EaseInOut

CSS ease-in-out — cubic-bezier(0.42, 0, 0.58, 1).

Emphasized

Material 3 emphasized easing — cubic-bezier(0.2, 0.0, 0.0, 1.0).

Cubic(f64, f64, f64, f64)

A cubic-Bézier with control points (x1, y1), (x2, y2) (endpoints fixed at (0, 0)/(1, 1)), as CSS cubic-bezier().

Implementations

impl Curve

pub fn transform(self, t: f64) -> f64

Evaluate the eased progress at normalized time t (clamped to [0, 1]).

pub fn interval(self, start: f64, end: f64) -> SegmentedCurve

Confine this curve to the [start, end] fraction of the timeline (Flutter’s Interval): 0.0 before start, 1.0 from end, and self re-evaluated at the rescaled local time between. An interval with end <= start is an instantaneous step at start.

Returns a SegmentedCurve rather than Curve because an Interval variant holding a Curve by value would be infinitely sized, and AnimationController relies on Curve: Copy.

Trait Implementations

impl Clone for Curve

fn clone(&self) -> Curve

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Curve

impl Debug for Curve

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

Formats the value using the given formatter.

impl PartialEq for Curve

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

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Curve