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缓动算法
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/* | |
* Tween.js | |
* t: current time(当前时间); | |
* b: beginning value(初始值); | |
* c: change in value(变化量); | |
* d: duration(持续时间)。 | |
* you can visit 'http://easings.net/zh-cn' to get effect | |
*/ | |
var Tween = { | |
Linear: function(t, b, c, d) { return c*t/d + b; }, | |
Quad: { | |
easeIn: function(t, b, c, d) { | |
return c * (t /= d) * t + b; | |
}, | |
easeOut: function(t, b, c, d) { | |
return -c *(t /= d)*(t-2) + b; | |
}, | |
easeInOut: function(t, b, c, d) { | |
if ((t /= d / 2) < 1) return c / 2 * t * t + b; | |
return -c / 2 * ((--t) * (t-2) - 1) + b; | |
} | |
}, | |
Cubic: { | |
easeIn: function(t, b, c, d) { | |
return c * (t /= d) * t * t + b; | |
}, | |
easeOut: function(t, b, c, d) { | |
return c * ((t = t/d - 1) * t * t + 1) + b; | |
}, | |
easeInOut: function(t, b, c, d) { | |
if ((t /= d / 2) < 1) return c / 2 * t * t*t + b; | |
return c / 2*((t -= 2) * t * t + 2) + b; | |
} | |
}, | |
Quart: { | |
easeIn: function(t, b, c, d) { | |
return c * (t /= d) * t * t*t + b; | |
}, | |
easeOut: function(t, b, c, d) { | |
return -c * ((t = t/d - 1) * t * t*t - 1) + b; | |
}, | |
easeInOut: function(t, b, c, d) { | |
if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b; | |
return -c / 2 * ((t -= 2) * t * t*t - 2) + b; | |
} | |
}, | |
Quint: { | |
easeIn: function(t, b, c, d) { | |
return c * (t /= d) * t * t * t * t + b; | |
}, | |
easeOut: function(t, b, c, d) { | |
return c * ((t = t/d - 1) * t * t * t * t + 1) + b; | |
}, | |
easeInOut: function(t, b, c, d) { | |
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; | |
} | |
}, | |
Sine: { | |
easeIn: function(t, b, c, d) { | |
return -c * Math.cos(t/d * (Math.PI/2)) + c + b; | |
}, | |
easeOut: function(t, b, c, d) { | |
return c * Math.sin(t/d * (Math.PI/2)) + b; | |
}, | |
easeInOut: function(t, b, c, d) { | |
return -c / 2 * (Math.cos(Math.PI * t/d) - 1) + b; | |
} | |
}, | |
Expo: { | |
easeIn: function(t, b, c, d) { | |
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b; | |
}, | |
easeOut: function(t, b, c, d) { | |
return (t==d) ? b + c : c * (-Math.pow(2, -10 * t/d) + 1) + b; | |
}, | |
easeInOut: function(t, b, c, d) { | |
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; | |
} | |
}, | |
Circ: { | |
easeIn: function(t, b, c, d) { | |
return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b; | |
}, | |
easeOut: function(t, b, c, d) { | |
return c * Math.sqrt(1 - (t = t/d - 1) * t) + b; | |
}, | |
easeInOut: function(t, b, c, d) { | |
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; | |
} | |
}, | |
Elastic: { | |
easeIn: function(t, b, c, d, a, p) { | |
var s; | |
if (t==0) return b; | |
if ((t /= d) == 1) return b + c; | |
if (typeof p == "undefined") p = d * .3; | |
if (!a || a < Math.abs(c)) { | |
s = p / 4; | |
a = c; | |
} else { | |
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; | |
}, | |
easeOut: function(t, b, c, d, a, p) { | |
var s; | |
if (t==0) return b; | |
if ((t /= d) == 1) return b + c; | |
if (typeof p == "undefined") p = d * .3; | |
if (!a || a < Math.abs(c)) { | |
a = c; | |
s = p / 4; | |
} else { | |
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); | |
}, | |
easeInOut: function(t, b, c, d, a, p) { | |
var s; | |
if (t==0) return b; | |
if ((t /= d / 2) == 2) return b+c; | |
if (typeof p == "undefined") p = d * (.3 * 1.5); | |
if (!a || a < Math.abs(c)) { | |
a = c; | |
s = p / 4; | |
} else { | |
s = p / (2 *Math.PI) * Math.asin(c / a); | |
} | |
if (t < 1) return -.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 ) * .5 + c + b; | |
} | |
}, | |
Back: { | |
easeIn: function(t, b, c, d, s) { | |
if (typeof s == "undefined") s = 1.70158; | |
return c * (t /= d) * t * ((s + 1) * t - s) + b; | |
}, | |
easeOut: function(t, b, c, d, s) { | |
if (typeof s == "undefined") s = 1.70158; | |
return c * ((t = t/d - 1) * t * ((s + 1) * t + s) + 1) + b; | |
}, | |
easeInOut: function(t, b, c, d, s) { | |
if (typeof 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; | |
} | |
}, | |
Bounce: { | |
easeIn: function(t, b, c, d) { | |
return c - Tween.Bounce.easeOut(d-t, 0, c, d) + b; | |
}, | |
easeOut: function(t, b, c, d) { | |
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 + .75) + b; | |
} else if (t < (2.5 / 2.75)) { | |
return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b; | |
} else { | |
return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b; | |
} | |
}, | |
easeInOut: function(t, b, c, d) { | |
if (t < d / 2) { | |
return Tween.Bounce.easeIn(t * 2, 0, c, d) * .5 + b; | |
} else { | |
return Tween.Bounce.easeOut(t * 2 - d, 0, c, d) * .5 + c * .5 + b; | |
} | |
} | |
} | |
} | |
Math.tween = Tween; |
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