Struct ClampingScrollSimulation 

pub struct ClampingScrollSimulation { /* private fields */ }

Android’s fling curve — the SplineOverScroller deceleration a clamping scroll surface runs after a release, which decays to a hard stop at a known duration and distance rather than an asymptote.

Implementations

impl ClampingScrollSimulation

pub const DEFAULT_FRICTION: f64 = 0.015

Android ViewConfiguration’s default scroll friction.

pub const INFLEXION: f64 = 0.35

Android SplineOverScroller.INFLEXION, where the fling spline’s two tension segments cross, and the velocity scale in the deceleration term below.

pub const PHYSICAL_COEFF: f64

Android’s mPhysicalCoeff: gravity (m/s²) × inches per meter × dpi × an empirical tuning factor. The dpi term is fixed at 160 — one Android density-independent pixel, which is what this crate’s logical pixel is.

pub fn deceleration_rate() -> f64

Android’s SplineOverScroller.DECELERATION_RATE (≈ 2.358202).

Computed from Android’s own expression rather than transcribed as a decimal; a function rather than a const because f64::ln is not const.

pub fn new( position: f64, velocity: f64, friction: f64, tolerance: Tolerance, ) -> Self

A fling from position at velocity px/s under friction (Self::DEFAULT_FRICTION for the platform default).

pub fn duration(&self) -> f64

Seconds until the fling stops.

pub fn final_x(&self) -> f64

Where the fling stops.

Trait Implementations

impl Clone for ClampingScrollSimulation

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 ClampingScrollSimulation

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

Formats the value using the given formatter.

impl Simulation for ClampingScrollSimulation

fn x(&self, time: f64) -> f64

The position at time seconds.

fn dx(&self, time: f64) -> f64

The velocity at time seconds.

fn is_done(&self, time: f64) -> bool

Whether the simulation has settled (within its own tolerance) by time seconds.