mirror of
https://github.com/photonstorm/phaser
synced 2024-12-24 12:03:36 +00:00
62 lines
2 KiB
JavaScript
62 lines
2 KiB
JavaScript
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var Phaser;
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(function (Phaser) {
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/// <reference path="../../_definitions.ts" />
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/**
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* Phaser - Easing - Elastic
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*
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* For use with Phaser.Tween
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*/
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(function (Easing) {
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var Elastic = (function () {
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function Elastic() {
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}
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Elastic.In = function (k) {
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var s, a = 0.1, p = 0.4;
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if (k === 0)
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return 0;
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if (k === 1)
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return 1;
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if (!a || a < 1) {
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a = 1;
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s = p / 4;
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} else
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s = p * Math.asin(1 / a) / (2 * Math.PI);
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return -(a * Math.pow(2, 10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p));
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};
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Elastic.Out = function (k) {
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var s, a = 0.1, p = 0.4;
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if (k === 0)
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return 0;
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if (k === 1)
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return 1;
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if (!a || a < 1) {
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a = 1;
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s = p / 4;
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} else
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s = p * Math.asin(1 / a) / (2 * Math.PI);
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return (a * Math.pow(2, -10 * k) * Math.sin((k - s) * (2 * Math.PI) / p) + 1);
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};
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Elastic.InOut = function (k) {
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var s, a = 0.1, p = 0.4;
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if (k === 0)
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return 0;
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if (k === 1)
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return 1;
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if (!a || a < 1) {
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a = 1;
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s = p / 4;
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} else
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s = p * Math.asin(1 / a) / (2 * Math.PI);
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if ((k *= 2) < 1)
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return -0.5 * (a * Math.pow(2, 10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p));
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return a * Math.pow(2, -10 * (k -= 1)) * Math.sin((k - s) * (2 * Math.PI) / p) * 0.5 + 1;
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};
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return Elastic;
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})();
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Easing.Elastic = Elastic;
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})(Phaser.Easing || (Phaser.Easing = {}));
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var Easing = Phaser.Easing;
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})(Phaser || (Phaser = {}));
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