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easings.js
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easings.js
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/**
* @param {*} t current time
* @param {*} b begInnIng value
* @param {*} c change In value
* @param {*} d duration
*/
module.exports = {
easeInQuad: function(t, b, c, d = 1) {
return c * (t /= d) * t + b;
},
easeOutQuad: function(t, b, c, d = 1) {
return -c * (t /= d) * (t - 2) + b;
},
easeInOutQuad: function(t, b, c, d = 1) {
if ((t /= d / 2) < 1) return (c / 2) * t * t + b;
return (-c / 2) * (--t * (t - 2) - 1) + b;
},
easeInCubic: function(t, b, c, d = 1) {
return c * (t /= d) * t * t + b;
},
easeOutCubic: function(t, b, c, d = 1) {
return c * ((t = t / d - 1) * t * t + 1) + b;
},
easeInOutCubic: function(t, b, c, d = 1) {
if ((t /= d / 2) < 1) return (c / 2) * t * t * t + b;
return (c / 2) * ((t -= 2) * t * t + 2) + b;
},
easeInQuart: function(t, b, c, d = 1) {
return c * (t /= d) * t * t * t + b;
},
easeOutQuart: function(t, b, c, d = 1) {
return -c * ((t = t / d - 1) * t * t * t - 1) + b;
},
easeInOutQuart: function(t, b, c, d = 1) {
if ((t /= d / 2) < 1) return (c / 2) * t * t * t * t + b;
return (-c / 2) * ((t -= 2) * t * t * t - 2) + b;
},
easeInQuint: function(t, b, c, d = 1) {
return c * (t /= d) * t * t * t * t + b;
},
easeOutQuint: function(t, b, c, d = 1) {
return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
},
easeInOutQuint: function(t, b, c, d = 1) {
if ((t /= d / 2) < 1) return (c / 2) * t * t * t * t * t + b;
return (c / 2) * ((t -= 2) * t * t * t * t + 2) + b;
},
easeInSine: function(t, b, c, d = 1) {
return -c * Math.cos((t / d) * (Math.PI / 2)) + c + b;
},
easeOutSine: function(t, b, c, d = 1) {
return c * Math.sin((t / d) * (Math.PI / 2)) + b;
},
easeInOutSine: function(t, b, c, d = 1) {
return (-c / 2) * (Math.cos((Math.PI * t) / d) - 1) + b;
},
easeInExpo: function(t, b, c, d = 1) {
return t == 0 ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
},
easeOutExpo: function(t, b, c, d = 1) {
return t == d ? b + c : c * (-Math.pow(2, (-10 * t) / d) + 1) + b;
},
easeInOutExpo: function(t, b, c, d = 1) {
if (t == 0) return b;
if (t == d) return b + c;
if ((t /= d / 2) < 1) return (c / 2) * Math.pow(2, 10 * (t - 1)) + b;
return (c / 2) * (-Math.pow(2, -10 * --t) + 2) + b;
},
easeInCirc: function(t, b, c, d = 1) {
return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
},
easeOutCirc: function(t, b, c, d = 1) {
return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
},
easeInOutCirc: function(t, b, c, d = 1) {
if ((t /= d / 2) < 1) return (-c / 2) * (Math.sqrt(1 - t * t) - 1) + b;
return (c / 2) * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
},
easeInElastic: function(t, b, c, d = 1) {
var s = 1.70158;
var p = 0;
var a = c;
if (t == 0) return b;
if ((t /= d) == 1) return b + c;
if (!p) p = d * 0.3;
if (a < Math.abs(c)) {
a = c;
var s = p / 4;
} else var s = (p / (2 * Math.PI)) * Math.asin(c / a);
return (
-(
a *
Math.pow(2, 10 * (t -= 1)) *
Math.sin(((t * d - s) * (2 * Math.PI)) / p)
) + b
);
},
easeOutElastic: function(t, b, c, d = 1) {
var s = 1.70158;
var p = 0;
var a = c;
if (t == 0) return b;
if ((t /= d) == 1) return b + c;
if (!p) p = d * 0.3;
if (a < Math.abs(c)) {
a = c;
var s = p / 4;
} else var s = (p / (2 * Math.PI)) * Math.asin(c / a);
return (
a * Math.pow(2, -10 * t) * Math.sin(((t * d - s) * (2 * Math.PI)) / p) +
c +
b
);
},
easeInOutElastic: function(t, b, c, d = 1) {
var s = 1.70158;
var p = 0;
var a = c;
if (t == 0) return b;
if ((t /= d / 2) == 2) return b + c;
if (!p) p = d * (0.3 * 1.5);
if (a < Math.abs(c)) {
a = c;
var s = p / 4;
} else var s = (p / (2 * Math.PI)) * Math.asin(c / a);
if (t < 1)
return (
-0.5 *
(a *
Math.pow(2, 10 * (t -= 1)) *
Math.sin(((t * d - s) * (2 * Math.PI)) / p)) +
b
);
return (
a *
Math.pow(2, -10 * (t -= 1)) *
Math.sin(((t * d - s) * (2 * Math.PI)) / p) *
0.5 +
c +
b
);
},
easeInBack: function(t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c * (t /= d) * t * ((s + 1) * t - s) + b;
},
easeOutBack: function(t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
},
easeInOutBack: function(t, b, c, d, s) {
if (s == undefined) s = 1.70158;
if ((t /= d / 2) < 1)
return (c / 2) * (t * t * (((s *= 1.525) + 1) * t - s)) + b;
return (c / 2) * ((t -= 2) * t * (((s *= 1.525) + 1) * t + s) + 2) + b;
},
easeInBounce: function(t, b, c, d = 1) {
return c - this.easeOutBounce(d - t, 0, c, d) + b;
},
easeOutBounce: function(t, b, c, d = 1) {
if ((t /= d) < 1 / 2.75) {
return c * (7.5625 * t * t) + b;
} else if (t < 2 / 2.75) {
return c * (7.5625 * (t -= 1.5 / 2.75) * t + 0.75) + b;
} else if (t < 2.5 / 2.75) {
return c * (7.5625 * (t -= 2.25 / 2.75) * t + 0.9375) + b;
} else {
return c * (7.5625 * (t -= 2.625 / 2.75) * t + 0.984375) + b;
}
},
easeInOutBounce: function(t, b, c, d = 1) {
if (t < d / 2) return this.easeInBounce(t * 2, 0, c, d) * 0.5 + b;
return this.easeOutBounce(t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b;
},
beat: function(t, intensity = 2, frequency = 2) {
const v = Math.atan(Math.sin(t * Math.PI * frequency) * intensity);
return (v + Math.PI / 2) / Math.PI;
},
};