Struct MotionValue 

pub struct MotionValue { /* private fields */ }

A retained scalar motion value, with no timers, observers, or heap allocations. Feed its samples into any native style, paint parameter, text, or derived value. Arithmetic at numeric extremes saturates to finite limits; indeterminate overflow resolves to zero. Use ordinary UI-sized units for meaningful physical trajectories.

Implementations

impl MotionValue

pub fn new(value: f64) -> Self

Creates a resting value. Panics for non-finite input.

pub fn get(&self) -> f64

Last sampled value; this does not advance time.

pub fn rescale(&mut self, factor: f64)

Converts positive linear units while retaining trajectory, momentum and inertia bounds. Panics for a nonpositive or non-finite factor. Numeric overflow saturates using the same policy as ordinary motion arithmetic. Spring rest thresholds remain expressed in the new units.

pub fn velocity(&self) -> f64

Last sampled velocity.

pub fn set(&mut self, value: f64, now: Duration)

Directly sets a value and estimates velocity from elapsed time. Cancels animation.

pub fn jump(&mut self, value: f64, now: Duration)

Assigns a value, clears momentum, and cancels animation without a completion event.

pub fn animate(&mut self, target: f64, transition: Transition, now: Duration)

Retargets from the presentation at now. Identical declarations do not restart.

pub fn animate_delayed( &mut self, target: f64, transition: Transition, delay: Duration, now: Duration, )

Retargets with a delay, preserving incoming spring velocity across the hold.

pub fn coast(&mut self, inertia: Inertia, now: Duration)

Starts exponential inertia from the last presentation and velocity. Bounds switch to a spring at the exact crossing time, independent of frame rate.

pub fn sample(&mut self, now: Duration, reduced_motion: bool) -> ValueFrame

Samples a monotonic clock. Reduced motion finishes immediately, including inertia.

Trait Implementations

impl Clone for MotionValue

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MotionValue

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

Formats the value using the given formatter.