gsap
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GSAP is a framework-agnostic JavaScript animation library that turns developers into animation superheroes. Build high-performance animations that work in **every** major browser. Animate CSS, SVG, canvas, React, Vue, WebGL, colors, strings, motion paths,
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JavaScript
/*!
* CustomWiggle 3.13.0
* https://gsap.com
*
* @license Copyright 2008-2025, GreenSock. All rights reserved.
* Subject to the terms at https://gsap.com/standard-license
* @author: Jack Doyle, jack@greensock.com
*/
/* eslint-disable */
let gsap, _coreInitted, createCustomEase,
_getGSAP = () => gsap || (typeof(window) !== "undefined" && (gsap = window.gsap) && gsap.registerPlugin && gsap),
_eases = {
easeOut: "M0,1,C0.7,1,0.6,0,1,0",
easeInOut: "M0,0,C0.1,0,0.24,1,0.444,1,0.644,1,0.6,0,1,0",
anticipate: "M0,0,C0,0.222,0.024,0.386,0,0.4,0.18,0.455,0.65,0.646,0.7,0.67,0.9,0.76,1,0.846,1,1",
uniform: "M0,0,C0,0.95,0,1,0,1,0,1,1,1,1,1,1,1,1,0,1,0"
},
_linearEase = p => p,
_initCore = required => {
if (!_coreInitted) {
gsap = _getGSAP();
createCustomEase = gsap && gsap.parseEase("_CE");
if (createCustomEase) {
for (let p in _eases) {
_eases[p] = createCustomEase("", _eases[p]);
}
_coreInitted = 1;
_create("wiggle").config = vars => typeof(vars) === "object" ? _create("", vars) : _create("wiggle(" + vars + ")", {wiggles:+vars});
} else {
required && console.warn("Please gsap.registerPlugin(CustomEase, CustomWiggle)");
}
}
},
_parseEase = (ease, invertNonCustomEases) => {
if (typeof(ease) !== "function") {
ease = gsap.parseEase(ease) || createCustomEase("", ease);
}
return (ease.custom || !invertNonCustomEases) ? ease : p => 1 - ease(p);
},
_bonusValidated = 1, //<name>CustomWiggle</name>
_create = (id, vars) => {
if (!_coreInitted) {
_initCore(1);
}
vars = vars || {};
let wiggles = (vars.wiggles || 10) | 0,
inc = 1 / wiggles,
x = inc / 2,
anticipate = (vars.type === "anticipate"),
yEase = _eases[vars.type] || _eases.easeOut,
xEase = _linearEase,
rnd = 1000,
nextX, nextY, angle, handleX, handleY, easedX, y, path, i;
if (_bonusValidated) {
if (anticipate) { //the anticipate ease is actually applied on the x-axis (timing) and uses easeOut for amplitude.
xEase = yEase;
yEase = _eases.easeOut;
}
if (vars.timingEase) {
xEase = _parseEase(vars.timingEase);
}
if (vars.amplitudeEase) {
yEase = _parseEase(vars.amplitudeEase, true);
}
easedX = xEase(x);
y = anticipate ? -yEase(x) : yEase(x);
path = [0, 0, easedX / 4, 0, easedX / 2, y, easedX, y];
if (vars.type === "random") { //if we just select random values on the y-axis and plug them into the "normal" algorithm, since the control points are always straight horizontal, it creates a bit of a slowdown at each anchor which just didn't seem as desirable, so we switched to an algorithm that bends the control points to be more in line with their context.
path.length = 4;
nextX = xEase(inc);
nextY = Math.random() * 2 - 1;
for (i = 2; i < wiggles; i++) {
x = nextX;
y = nextY;
nextX = xEase(inc * i);
nextY = Math.random() * 2 - 1;
angle = Math.atan2(nextY - path[path.length - 3], nextX - path[path.length - 4]);
handleX = Math.cos(angle) * inc;
handleY = Math.sin(angle) * inc;
path.push(x - handleX, y - handleY, x, y, x + handleX, y + handleY);
}
path.push(nextX, 0, 1, 0);
} else {
for (i = 1; i < wiggles; i++) {
path.push(xEase(x + inc / 2), y);
x += inc;
y = ((y > 0) ? -1 : 1) * (yEase(i * inc));
easedX = xEase(x);
path.push(xEase(x - inc / 2), y, easedX, y);
}
path.push(xEase(x + inc / 4), y, xEase(x + inc / 4), 0, 1, 0);
}
i = path.length;
while (--i > -1) {
path[i] = ~~(path[i] * rnd) / rnd; //round values to avoid odd strings for super tiny values
}
path[2] = "C" + path[2];
return createCustomEase(id, "M" + path.join(","));
}
};
export class CustomWiggle {
constructor(id, vars) {
this.ease = _create(id, vars);
}
static create(id, vars) {
return _create(id, vars);
}
static register(core) {
gsap = core;
_initCore();
}
}
_getGSAP() && gsap.registerPlugin(CustomWiggle);
CustomWiggle.version = "3.13.0";
export { CustomWiggle as default };