FloatExponentialDecaySpec

This is a decay animation where the friction/deceleration is always proportional to the velocity. As a result, the velocity goes under an exponential decay. The constructor parameter, frictionMultiplier, can be tuned to adjust the amount of friction applied in the decay. The higher the multiplier, the higher the friction, the sooner the animation will stop, and the shorter distance the animation will travel with the same starting condition.

Summary

Public constructors
FloatExponentialDecaySpec(
    frictionMultiplier: @FloatRange(from = 0.0, fromInclusive = false) Float,
    absVelocityThreshold: @FloatRange(from = 0.0, fromInclusive = false) Float
)
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Public functions
open Long
getDurationNanos(initialValue: Float, initialVelocity: Float)

Returns the duration of the decay animation, in nanoseconds.
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open Float
getTargetValue(initialValue: Float, initialVelocity: Float)

Returns the target value of the animation based on the starting condition of the animation ( i.e. start value and start velocity).
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open Float
getValueFromNanos(
    playTimeNanos: Long,
    initialValue: Float,
    initialVelocity: Float
)

Returns the value of the animation at the given time.
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open Float
getVelocityFromNanos(
    playTimeNanos: Long,
    initialValue: Float,
    initialVelocity: Float
)

Returns the velocity of the animation at the given time.
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Public properties
open Float

This is the absolute value of a velocity threshold, below which the animation is considered finished.
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Public constructors

FloatExponentialDecaySpec

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Added in 1.0.0
FloatExponentialDecaySpec(
    frictionMultiplier: @FloatRange(from = 0.0, fromInclusive = false) Float = 1.0f,
    absVelocityThreshold: @FloatRange(from = 0.0, fromInclusive = false) Float = 0.1f
)
Parameters
frictionMultiplier: @FloatRange(from = 0.0, fromInclusive = false) Float = 1.0f

The friction multiplier, indicating how quickly the animation should stop. This should be greater than 0, with a default value of 1.0.
absVelocityThreshold: @FloatRange(from = 0.0, fromInclusive = false) Float = 0.1f

The speed at which the animation is considered close enough to rest for the animation to finish.

Public functions

getDurationNanos

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open fun getDurationNanos(initialValue: Float, initialVelocity: Float): Long

Returns the duration of the decay animation, in nanoseconds.

Parameters
initialValue: Float

start value of the animation
initialVelocity: Float

start velocity of the animation

getTargetValue

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open fun getTargetValue(initialValue: Float, initialVelocity: Float): Float

Returns the target value of the animation based on the starting condition of the animation ( i.e. start value and start velocity).

Parameters
initialValue: Float

The start value of the animation
initialVelocity: Float

The start velocity of the animation

getValueFromNanos

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open fun getValueFromNanos(
    playTimeNanos: Long,
    initialValue: Float,
    initialVelocity: Float
): Float

Returns the value of the animation at the given time.

Parameters
playTimeNanos: Long

The time elapsed in milliseconds since the start of the animation
initialValue: Float

The start value of the animation
initialVelocity: Float

The start velocity of the animation

getVelocityFromNanos

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open fun getVelocityFromNanos(
    playTimeNanos: Long,
    initialValue: Float,
    initialVelocity: Float
): Float

Returns the velocity of the animation at the given time.

Parameters
playTimeNanos: Long

The time elapsed in milliseconds since the start of the animation
initialValue: Float

The start value of the animation
initialVelocity: Float

The start velocity of the animation

Public properties

absVelocityThreshold

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open val absVelocityThreshold: Float

This is the absolute value of a velocity threshold, below which the animation is considered finished.