Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/**
* 简单的 Easing Functions
* - 值域变化范围，从 [0, 1] 到 [0, 1]
* - 即输入值范围从 0 到 1
* - 输出也为从 0 到 1
* - 适合进行百分比动画运算
*
* 动画函数
* - linear
* - easeInQuad
* - easeOutQuad
* - easeInOutQuad
* - easeInCubic
* - easeInQuart
* - easeOutQuart
* - easeInOutQuart
* - easeInQuint
* - easeOutQuint
* - easeInOutQuint
* @module fx/easing
* @see [easing.js](https://gist.github.com/gre/1650294)
* @example
* var $easing = require('@spore-ui/kit/packages/fx/easing');
* $easing.linear(0.5); // 0.5
* $easing.easeInQuad(0.5); // 0.25
* $easing.easeInCubic(0.5); // 0.125
*/
var easing = {
// no easing, no acceleration
linear: function (t) {
return t;
},
// accelerating from zero velocity
easeInQuad: function (t) {
return t * t;
},
// decelerating to zero velocity
easeOutQuad: function (t) {
return t * (2 - t);
},
// acceleration until halfway, then deceleration
easeInOutQuad: function (t) {
return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
},
// accelerating from zero velocity
easeInCubic: function (t) {
return t * t * t;
},
// decelerating to zero velocity
easeOutCubic: function (t) {
return (--t) * t * t + 1;
},
// acceleration until halfway, then deceleration
easeInOutCubic: function (t) {
return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1;
},
// accelerating from zero velocity
easeInQuart: function (t) {
return t * t * t * t;
},
// decelerating to zero velocity
easeOutQuart: function (t) {
return 1 - (--t) * t * t * t;
},
// acceleration until halfway, then deceleration
easeInOutQuart: function (t) {
return t < 0.5 ? 8 * t * t * t * t : 1 - 8 * (--t) * t * t * t;
},
// accelerating from zero velocity
easeInQuint: function (t) {
return t * t * t * t * t;
},
// decelerating to zero velocity
easeOutQuint: function (t) {
return 1 + (--t) * t * t * t * t;
},
// acceleration until halfway, then deceleration
easeInOutQuint: function (t) {
return t < 0.5 ? 16 * t * t * t * t * t : 1 + 16 * (--t) * t * t * t * t;
},
};
module.exports = easing;
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