Enum Easing 

pub enum Easing {
    Linear,
    InQuad,
    OutQuad,
    InOutQuad,
    InCubic,
    OutCubic,
    InOutCubic,
    InQuart,
    OutQuart,
    InOutQuart,
    InQuint,
    OutQuint,
    InOutQuint,
    InSine,
    OutSine,
    InOutSine,
    InExpo,
    OutExpo,
    InOutExpo,
    InCirc,
    OutCirc,
    InOutCirc,
    InBack,
    OutBack,
    InOutBack,
    InElastic,
    OutElastic,
    InOutElastic,
    InBounce,
    OutBounce,
    InOutBounce,
}

The complete set of Robert Penner easing functions used to warp a linear interpolation parameter into an accelerated / decelerated curve.

Each variant maps a normalized input t in the range 0.0 to 1.0 to an eased output, following the same naming as mainstream engines (Godot Tween::EaseType, Phaser Ease, CSS timing-function).

Variants

Linear

Constant velocity: f(t) = t.

InQuad

Quadratic acceleration from zero velocity.

OutQuad

Quadratic deceleration to zero velocity.

InOutQuad

Quadratic acceleration until halfway, then deceleration.

InCubic

Cubic acceleration from zero velocity.

OutCubic

Cubic deceleration to zero velocity.

InOutCubic

Cubic acceleration until halfway, then deceleration.

InQuart

Quartic acceleration from zero velocity.

OutQuart

Quartic deceleration to zero velocity.

InOutQuart

Quartic acceleration until halfway, then deceleration.

InQuint

Quintic acceleration from zero velocity.

OutQuint

Quintic deceleration to zero velocity.

InOutQuint

Quintic acceleration until halfway, then deceleration.

InSine

Sinusoidal acceleration from zero velocity.

OutSine

Sinusoidal deceleration to zero velocity.

InOutSine

Sinusoidal acceleration until halfway, then deceleration.

InExpo

Exponential acceleration from zero velocity.

OutExpo

Exponential deceleration to zero velocity.

InOutExpo

Exponential acceleration until halfway, then deceleration.

InCirc

Circular acceleration from zero velocity.

OutCirc

Circular deceleration to zero velocity.

InOutCirc

Circular acceleration until halfway, then deceleration.

InBack

Overshoots backwards before moving forwards.

OutBack

Overshoots the target then settles back onto it.

InOutBack

Overshoots backwards then forwards past the target before settling.

InElastic

Elastic oscillation building up from rest.

OutElastic

Elastic oscillation settling down onto the target.

InOutElastic

Elastic oscillation at both ends.

InBounce

Bounces off the start before moving forwards.

OutBounce

Bounces off the target like a dropped ball.

InOutBounce

Bounces at both ends.

Implementations

impl Easing

Implements easing curve evaluation for Easing.

pub fn evaluate(&self, t: f64) -> f64

Evaluates the easing curve at the given normalized time.

The input is clamped into the range 0.0 to 1.0 before evaluation, so callers may pass slightly out-of-range accumulators without producing out-of-range output.

Arguments

• f64 - The normalized time, typically in the range 0.0 to 1.0.

Returns

• f64 - The eased value, where 0.0 maps to the start and 1.0 to the end.

pub fn interpolate(&self, start: f64, end: f64, t: f64) -> f64

Applies this easing curve to interpolate between two scalar values.

Arguments

• f64 - The start value.
• f64 - The end value.
• f64 - The normalized time, typically in the range 0.0 to 1.0.

Returns

• f64 - The eased interpolation between start and end.

Trait Implementations

impl Clone for Easing

fn clone(&self) -> Easing

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Easing

impl Debug for Easing

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

Formats the value using the given formatter.

impl Default for Easing

fn default() -> Easing

Returns the “default value” for a type.

impl Eq for Easing

impl PartialEq for Easing

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Easing