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- /**
- * 缓动代码来自 https://github.com/sole/tween.js/blob/master/src/Tween.js
- * @see http://sole.github.io/tween.js/examples/03_graphs.html
- * @exports zrender/animation/easing
- */
- var easing = {
- /**
- * @param {number} k
- * @return {number}
- */
- linear: function (k) {
- return k;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- quadraticIn: function (k) {
- return k * k;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- quadraticOut: function (k) {
- return k * (2 - k);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- quadraticInOut: function (k) {
- if ((k *= 2) < 1) {
- return 0.5 * k * k;
- }
- return -0.5 * (--k * (k - 2) - 1);
- },
- // 三次方的缓动(t^3)
- /**
- * @param {number} k
- * @return {number}
- */
- cubicIn: function (k) {
- return k * k * k;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- cubicOut: function (k) {
- return --k * k * k + 1;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- cubicInOut: function (k) {
- if ((k *= 2) < 1) {
- return 0.5 * k * k * k;
- }
- return 0.5 * ((k -= 2) * k * k + 2);
- },
- // 四次方的缓动(t^4)
- /**
- * @param {number} k
- * @return {number}
- */
- quarticIn: function (k) {
- return k * k * k * k;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- quarticOut: function (k) {
- return 1 - --k * k * k * k;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- quarticInOut: function (k) {
- if ((k *= 2) < 1) {
- return 0.5 * k * k * k * k;
- }
- return -0.5 * ((k -= 2) * k * k * k - 2);
- },
- // 五次方的缓动(t^5)
- /**
- * @param {number} k
- * @return {number}
- */
- quinticIn: function (k) {
- return k * k * k * k * k;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- quinticOut: function (k) {
- return --k * k * k * k * k + 1;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- quinticInOut: function (k) {
- if ((k *= 2) < 1) {
- return 0.5 * k * k * k * k * k;
- }
- return 0.5 * ((k -= 2) * k * k * k * k + 2);
- },
- // 正弦曲线的缓动(sin(t))
- /**
- * @param {number} k
- * @return {number}
- */
- sinusoidalIn: function (k) {
- return 1 - Math.cos(k * Math.PI / 2);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- sinusoidalOut: function (k) {
- return Math.sin(k * Math.PI / 2);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- sinusoidalInOut: function (k) {
- return 0.5 * (1 - Math.cos(Math.PI * k));
- },
- // 指数曲线的缓动(2^t)
- /**
- * @param {number} k
- * @return {number}
- */
- exponentialIn: function (k) {
- return k === 0 ? 0 : Math.pow(1024, k - 1);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- exponentialOut: function (k) {
- return k === 1 ? 1 : 1 - Math.pow(2, -10 * k);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- exponentialInOut: function (k) {
- if (k === 0) {
- return 0;
- }
- if (k === 1) {
- return 1;
- }
- if ((k *= 2) < 1) {
- return 0.5 * Math.pow(1024, k - 1);
- }
- return 0.5 * (-Math.pow(2, -10 * (k - 1)) + 2);
- },
- // 圆形曲线的缓动(sqrt(1-t^2))
- /**
- * @param {number} k
- * @return {number}
- */
- circularIn: function (k) {
- return 1 - Math.sqrt(1 - k * k);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- circularOut: function (k) {
- return Math.sqrt(1 - --k * k);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- circularInOut: function (k) {
- if ((k *= 2) < 1) {
- return -0.5 * (Math.sqrt(1 - k * k) - 1);
- }
- return 0.5 * (Math.sqrt(1 - (k -= 2) * k) + 1);
- },
- // 创建类似于弹簧在停止前来回振荡的动画
- /**
- * @param {number} k
- * @return {number}
- */
- elasticIn: function (k) {
- var s;
- var a = 0.1;
- var p = 0.4;
- if (k === 0) {
- return 0;
- }
- if (k === 1) {
- return 1;
- }
- if (!a || a < 1) {
- a = 1;
- s = p / 4;
- } else {
- s = p * Math.asin(1 / a) / (2 * Math.PI);
- }
- return -(a * Math.pow(2, 10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p));
- },
- /**
- * @param {number} k
- * @return {number}
- */
- elasticOut: function (k) {
- var s;
- var a = 0.1;
- var p = 0.4;
- if (k === 0) {
- return 0;
- }
- if (k === 1) {
- return 1;
- }
- if (!a || a < 1) {
- a = 1;
- s = p / 4;
- } else {
- s = p * Math.asin(1 / a) / (2 * Math.PI);
- }
- return a * Math.pow(2, -10 * k) * Math.sin((k - s) * (2 * Math.PI) / p) + 1;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- elasticInOut: function (k) {
- var s;
- var a = 0.1;
- var p = 0.4;
- if (k === 0) {
- return 0;
- }
- if (k === 1) {
- return 1;
- }
- if (!a || a < 1) {
- a = 1;
- s = p / 4;
- } else {
- s = p * Math.asin(1 / a) / (2 * Math.PI);
- }
- if ((k *= 2) < 1) {
- return -0.5 * (a * Math.pow(2, 10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p));
- }
- return a * Math.pow(2, -10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p) * 0.5 + 1;
- },
- // 在某一动画开始沿指示的路径进行动画处理前稍稍收回该动画的移动
- /**
- * @param {number} k
- * @return {number}
- */
- backIn: function (k) {
- var s = 1.70158;
- return k * k * ((s + 1) * k - s);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- backOut: function (k) {
- var s = 1.70158;
- return --k * k * ((s + 1) * k + s) + 1;
- },
- /**
- * @param {number} k
- * @return {number}
- */
- backInOut: function (k) {
- var s = 1.70158 * 1.525;
- if ((k *= 2) < 1) {
- return 0.5 * (k * k * ((s + 1) * k - s));
- }
- return 0.5 * ((k -= 2) * k * ((s + 1) * k + s) + 2);
- },
- // 创建弹跳效果
- /**
- * @param {number} k
- * @return {number}
- */
- bounceIn: function (k) {
- return 1 - easing.bounceOut(1 - k);
- },
- /**
- * @param {number} k
- * @return {number}
- */
- bounceOut: function (k) {
- if (k < 1 / 2.75) {
- return 7.5625 * k * k;
- } else if (k < 2 / 2.75) {
- return 7.5625 * (k -= 1.5 / 2.75) * k + 0.75;
- } else if (k < 2.5 / 2.75) {
- return 7.5625 * (k -= 2.25 / 2.75) * k + 0.9375;
- } else {
- return 7.5625 * (k -= 2.625 / 2.75) * k + 0.984375;
- }
- },
- /**
- * @param {number} k
- * @return {number}
- */
- bounceInOut: function (k) {
- if (k < 0.5) {
- return easing.bounceIn(k * 2) * 0.5;
- }
- return easing.bounceOut(k * 2 - 1) * 0.5 + 0.5;
- }
- };
- var _default = easing;
- module.exports = _default;
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