Enum Curve 

pub enum Curve {
    Linear,
    EaseIn,
    EaseOut,
    EaseInOut,
    Spring {
        response: f64,
        damping: f64,
    },
}

The timing curve of an animation (§8.4). Native backends map each variant onto their own easing (CAMediaTimingFunction, QEasingCurve, ArkUI ARKUI_CURVE_*, spring animators); the canvas/self-driven path samples it via Curve::fraction. Spring matches SwiftUI’s .spring(response:dampingFraction:).

Variants

Linear

EaseIn

EaseOut

EaseInOut

Spring

response = approximate settling period (seconds); damping = damping ratio (1.0 = critically damped, <1 = bouncy overshoot).

Fields

response: f64

damping: f64

Implementations

impl Curve

pub fn fraction(self, elapsed: f64, duration: f64) -> f64

Fraction of the transition complete at elapsed seconds (0 at start, reaching — or, for an under-damped spring, overshooting — 1). Easing curves clamp to duration; springs evaluate their analytic unit-step response and use duration only as a settle cap. Drives the self-driven/canvas path; native backends interpolate on their own compositor instead.

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

Eased progress for normalized t in 0.0..=1.0 (springs pass through — use [fraction]).

pub fn is_settled(self, elapsed: f64, duration: f64) -> bool

Whether the transition has settled, so the canvas frame clock can stop ticking it.

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 Debug for Curve

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

Formats the value using the given formatter.

impl PartialEq for Curve

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Curve

impl StructuralPartialEq for Curve