EasingFunctions

A bunch of reuseable Easing Functions, including those from the Material Design specification (Standard, Acceleration, and Deceleration)

These are the available EasingFunctions:

| Directionless | In | Out | InOut | OutIn | |:----------------:|:---------:|:----------:|:------------:|:------------:| | Linear | InQuad | OutQuad | InOutQuad | OutInQuad | | Spring | InCubic | OutCubic | InOutCubic | OutInCubic | | SoftSpring | InQuart | OutQuart | InOutQuart | OutInQuart | | RevBack | InQuint | OutQuint | InOutQuint | OutInQuint | | RidiculousWiggle | InSine | OutSine | InOutSine | OutInSine | | Smooth | InExpo | OutExpo | InOutExpo | OutInExpo | | Smoother | InCirc | OutCirc | InOutCirc | OutInCirc | | Acceleration | InElastic | OutElastic | InOutElastic | OutInElastic | | Deceleration | InBack | OutBack | InOutBack | OutInBack | | Sharp | InBounce | OutBounce | InOutBounce | OutInBounce | | Standard |

Signature:

/**
 * Returns a value between [initialValue, initialValue + changeInValue] or [0, 1] that represents an in-between value
 * along a Bezier curve.
 * @param elapsedTime the time elapsed [0, d]
 * @param initialValue beginning value being interpolated (default = 0)
 * @param changeInValue change in value being interpolated (equivalent to: ending - beginning) (default = 1)
 * @param totalDuration duration interpolation is occurring over (default = 1)
 */
type BasicEasingFunction = (
	elapsedTime: number,
	initialValue: number,
	changeInValue: number,
	totalDuration: number,
) => number;

Some functions have an extra parameter or two. These will either be the amplitude and period or the overshoot.