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June 14, 2017 03:50
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移动函数 移动的方式
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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） | |
| * 根据 当前 运行 时间 计算 当前 时间 的 运动 位置 返回 的 是 位置 | |
| */ | |
| 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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