penner

Penner's easing equations

npm install penner
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penner

A library for Penner's easing equations

what?

See http://upshots.org/actionscript/jsas-understanding-easing

usage

var t = 0,        // current time (ms, s, frames, ...)
    b = 10,        // initial value
    c = 100,    // change in value (final value - initial value)
    d = 2        // duration (same units as t)
    value = penner.easeOutQuad(t, b, c, d);

included easing functions

linear easeInQuad easeOutQuad easeInOutQuad easeInCubic easeOutCubic easeInOutCubic easeInQuart easeOutQuart easeInOutQuart easeInQuint easeOutQuint easeInOutQuint easeInSine easeOutSine easeInOutSine easeInExpo easeOutExpo easeInOutExpo easeInCirc easeOutCirc easeInOutCirc easeInElastic easeOutElastic easeInOutElastic easeInBack easeOutBack easeInOutBack easeInBounce easeOutBounce easeInOutBounce

size

Raw 6400 bytes
Uglified 3224 bytes
Uglified + gzipped 881 bytes

environment support

Any browser (as window.penner), AMD, CommonJS, NodeJS

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