vivo-ui
Version:
vivo ui component lib for vue
181 lines (179 loc) • 5.65 kB
JavaScript
/*
* 缓动函数
* 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
*/
const Tween = {
Linear: function (t, b, c, d) {
return c * t / d + 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
}
},
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
}
},
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
}
},
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
}
},
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 * 0.3
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 * 0.3
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 * (0.3 * 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 -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
}
},
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 + 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
}
},
easeInOut: function (t, b, c, d) {
if (t < d / 2) {
return Tween.Bounce.easeIn(t * 2, 0, c, d) * 0.5 + b
} else {
return Tween.Bounce.easeOut(t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b
}
}
}
}
export default Tween