ExponentialDecay class

Exponential velocity decay via FrictionSimulation.

decayPerSecond ∈ 0, 1 is the fraction of velocity lost per second. 0 → never decays, 1 → instant stop.

Inheritance

• Object
• Decay
• ExponentialDecay

Constructors

ExponentialDecay(double decayPerSecond, {double endVelocity = 60})

const

ExponentialDecay.halfLife(Duration t, {double endVelocity = 60})

Velocity half-life — the time for velocity to halve.

factory

ExponentialDecay.imageViewer({double endVelocity = 60})

Image-viewer feel — brief, image-sized fling with a visible tail.

const

ExponentialDecay.iosFast({double endVelocity = 60})

iOS .fast / paging feel — snappier (per-frame 0.99 @ 60fps).

const

ExponentialDecay.iosScroll({double endVelocity = 60})

iOS scrollview feel — long fling (per-frame 0.998 @ 60fps).

const

ExponentialDecay.none({double endVelocity = 60})

Velocity is killed at release — no fling at all.

const

ExponentialDecay.perFrame(double multiplier, {double fps = 60, double endVelocity = 60})

Per-frame velocity multiplier (iOS / JS conventions). 60fps default.

factory

Properties

decayPerSecond → double

Fraction of velocity lost per second.

final

endVelocity → double

Velocity (logical px/s) at which the decay phase ends. Higher = snappier handoff to settle; lower = more "complete" tail. Default 60 ≈ 1 px/frame at 60 Hz, the inter-frame visibility threshold.

final, inherited

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

simulationAt({required double position, required double velocity}) → Simulation

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited