http://hollywoodelitecomposers.com/js/easing.js

1
2/*
3 * jQuery EasIng v1.1.2 - http://gsgd.co.uk/sandbox/jquery.easIng.php
4 *
5 * Uses the built In easIng capabilities added In jQuery 1.1
6 * to offer multiple easIng options
7 *
8 * Copyright (c) 2007 George Smith
9 * Licensed under the MIT License:
10 *   http://www.opensource.org/licenses/mit-license.php
11 */
12
13// t: current time, b: begInnIng value, c: change In value, d: duration
14
15jQuery.extend( jQuery.easing,
16{
17	easeInQuad: function (x, t, b, c, d) {
18		return c*(t/=d)*t + b;
19	},
20	easeOutQuad: function (x, t, b, c, d) {
21		return -c *(t/=d)*(t-2) + b;
22	},
23	easeInOutQuad: function (x, t, b, c, d) {
24		if ((t/=d/2) < 1) return c/2*t*t + b;
25		return -c/2 * ((--t)*(t-2) - 1) + b;
26	},
27	easeInCubic: function (x, t, b, c, d) {
28		return c*(t/=d)*t*t + b;
29	},
30	easeOutCubic: function (x, t, b, c, d) {
31		return c*((t=t/d-1)*t*t + 1) + b;
32	},
33	easeInOutCubic: function (x, t, b, c, d) {
34		if ((t/=d/2) < 1) return c/2*t*t*t + b;
35		return c/2*((t-=2)*t*t + 2) + b;
36	},
37	easeInQuart: function (x, t, b, c, d) {
38		return c*(t/=d)*t*t*t + b;
39	},
40	easeOutQuart: function (x, t, b, c, d) {
41		return -c * ((t=t/d-1)*t*t*t - 1) + b;
42	},
43	easeInOutQuart: function (x, t, b, c, d) {
44		if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
45		return -c/2 * ((t-=2)*t*t*t - 2) + b;
46	},
47	easeInQuint: function (x, t, b, c, d) {
48		return c*(t/=d)*t*t*t*t + b;
49	},
50	easeOutQuint: function (x, t, b, c, d) {
51		return c*((t=t/d-1)*t*t*t*t + 1) + b;
52	},
53	easeInOutQuint: function (x, t, b, c, d) {
54		if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
55		return c/2*((t-=2)*t*t*t*t + 2) + b;
56	},
57	easeInSine: function (x, t, b, c, d) {
58		return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
59	},
60	easeOutSine: function (x, t, b, c, d) {
61		return c * Math.sin(t/d * (Math.PI/2)) + b;
62	},
63	easeInOutSine: function (x, t, b, c, d) {
64		return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
65	},
66	easeInExpo: function (x, t, b, c, d) {
67		return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
68	},
69	easeOutExpo: function (x, t, b, c, d) {
70		return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
71	},
72	easeInOutExpo: function (x, t, b, c, d) {
73		if (t==0) return b;
74		if (t==d) return b+c;
75		if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
76		return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
77	},
78	easeInCirc: function (x, t, b, c, d) {
79		return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
80	},
81	easeOutCirc: function (x, t, b, c, d) {
82		return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
83	},
84	easeInOutCirc: function (x, t, b, c, d) {
85		if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
86		return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
87	},
88	easeInElastic: function (x, t, b, c, d) {
89		var s=1.70158;var p=0;var a=c;
90		if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
91		if (a < Math.abs(c)) { a=c; var s=p/4; }
92		else var s = p/(2*Math.PI) * Math.asin (c/a);
93		return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
94	},
95	easeOutElastic: function (x, t, b, c, d) {
96		var s=1.70158;var p=0;var a=c;
97		if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
98		if (a < Math.abs(c)) { a=c; var s=p/4; }
99		else var s = p/(2*Math.PI) * Math.asin (c/a);
100		return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
101	},
102	easeInOutElastic: function (x, t, b, c, d) {
103		var s=1.70158;var p=0;var a=c;
104		if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) p=d*(.3*1.5);
105		if (a < Math.abs(c)) { a=c; var s=p/4; }
106		else var s = p/(2*Math.PI) * Math.asin (c/a);
107		if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
108		return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
109	},
110	easeInBack: function (x, t, b, c, d, s) {
111		if (s == undefined) s = 1.70158;
112		return c*(t/=d)*t*((s+1)*t - s) + b;
113	},
114	easeOutBack: function (x, t, b, c, d, s) {
115		if (s == undefined) s = 1.70158;
116		return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
117	},
118	easeInOutBack: function (x, t, b, c, d, s) {
119		if (s == undefined) s = 1.70158; 
120		if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
121		return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
122	},
123	easeInBounce: function (x, t, b, c, d) {
124		return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b;
125	},
126	easeOutBounce: function (x, t, b, c, d) {
127		if ((t/=d) < (1/2.75)) {
128			return c*(7.5625*t*t) + b;
129		} else if (t < (2/2.75)) {
130			return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
131		} else if (t < (2.5/2.75)) {
132			return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
133		} else {
134			return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
135		}
136	},
137	easeInOutBounce: function (x, t, b, c, d) {
138		if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
139		return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
140	}
141});
142