https://tudorondonia.com/javascript/jquery.easing.js

1/*
2 * jQuery Easing v1.3 - http://gsgd.co.uk/sandbox/jquery/easing/
3 */
4
5// t: current time, b: begInnIng value, c: change In value, d: duration
6jQuery.easing['jswing'] = jQuery.easing['swing'];
7
8jQuery.extend( jQuery.easing,
9{
10	def: 'easeOutQuad',
11	swing: function (x, t, b, c, d) {
12		//alert(jQuery.easing.default);
13		return jQuery.easing[jQuery.easing.def](x, t, b, c, d);
14	},
15	easeInQuad: function (x, t, b, c, d) {
16		return c*(t/=d)*t + b;
17	},
18	easeOutQuad: function (x, t, b, c, d) {
19		return -c *(t/=d)*(t-2) + b;
20	},
21	easeInOutQuad: function (x, t, b, c, d) {
22		if ((t/=d/2) < 1) return c/2*t*t + b;
23		return -c/2 * ((--t)*(t-2) - 1) + b;
24	},
25	easeInCubic: function (x, t, b, c, d) {
26		return c*(t/=d)*t*t + b;
27	},
28	easeOutCubic: function (x, t, b, c, d) {
29		return c*((t=t/d-1)*t*t + 1) + b;
30	},
31	easeInOutCubic: function (x, t, b, c, d) {
32		if ((t/=d/2) < 1) return c/2*t*t*t + b;
33		return c/2*((t-=2)*t*t + 2) + b;
34	},
35	easeInQuart: function (x, t, b, c, d) {
36		return c*(t/=d)*t*t*t + b;
37	},
38	easeOutQuart: function (x, t, b, c, d) {
39		return -c * ((t=t/d-1)*t*t*t - 1) + b;
40	},
41	easeInOutQuart: function (x, t, b, c, d) {
42		if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
43		return -c/2 * ((t-=2)*t*t*t - 2) + b;
44	},
45	easeInQuint: function (x, t, b, c, d) {
46		return c*(t/=d)*t*t*t*t + b;
47	},
48	easeOutQuint: function (x, t, b, c, d) {
49		return c*((t=t/d-1)*t*t*t*t + 1) + b;
50	},
51	easeInOutQuint: function (x, t, b, c, d) {
52		if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
53		return c/2*((t-=2)*t*t*t*t + 2) + b;
54	},
55	easeInSine: function (x, t, b, c, d) {
56		return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
57	},
58	easeOutSine: function (x, t, b, c, d) {
59		return c * Math.sin(t/d * (Math.PI/2)) + b;
60	},
61	easeInOutSine: function (x, t, b, c, d) {
62		return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
63	},
64	easeInExpo: function (x, t, b, c, d) {
65		return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
66	},
67	easeOutExpo: function (x, t, b, c, d) {
68		return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
69	},
70	easeInOutExpo: function (x, t, b, c, d) {
71		if (t==0) return b;
72		if (t==d) return b+c;
73		if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
74		return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
75	},
76	easeInCirc: function (x, t, b, c, d) {
77		return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
78	},
79	easeOutCirc: function (x, t, b, c, d) {
80		return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
81	},
82	easeInOutCirc: function (x, t, b, c, d) {
83		if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
84		return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
85	},
86	easeInElastic: function (x, t, b, c, d) {
87		var s=1.70158;var p=0;var a=c;
88		if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
89		if (a < Math.abs(c)) { a=c; var s=p/4; }
90		else var s = p/(2*Math.PI) * Math.asin (c/a);
91		return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
92	},
93	easeOutElastic: function (x, t, b, c, d) {
94		var s=1.70158;var p=0;var a=c;
95		if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
96		if (a < Math.abs(c)) { a=c; var s=p/4; }
97		else var s = p/(2*Math.PI) * Math.asin (c/a);
98		return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
99	},
100	easeInOutElastic: function (x, t, b, c, d) {
101		var s=1.70158;var p=0;var a=c;
102		if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) p=d*(.3*1.5);
103		if (a < Math.abs(c)) { a=c; var s=p/4; }
104		else var s = p/(2*Math.PI) * Math.asin (c/a);
105		if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
106		return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
107	},
108	easeInBack: function (x, t, b, c, d, s) {
109		if (s == undefined) s = 1.70158;
110		return c*(t/=d)*t*((s+1)*t - s) + b;
111	},
112	easeOutBack: function (x, t, b, c, d, s) {
113		if (s == undefined) s = 1.70158;
114		return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
115	},
116	easeInOutBack: function (x, t, b, c, d, s) {
117		if (s == undefined) s = 1.70158; 
118		if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
119		return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
120	},
121	easeInBounce: function (x, t, b, c, d) {
122		return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b;
123	},
124	easeOutBounce: function (x, t, b, c, d) {
125		if ((t/=d) < (1/2.75)) {
126			return c*(7.5625*t*t) + b;
127		} else if (t < (2/2.75)) {
128			return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
129		} else if (t < (2.5/2.75)) {
130			return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
131		} else {
132			return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
133		}
134	},
135	easeInOutBounce: function (x, t, b, c, d) {
136		if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
137		return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
138	}
139});