mirror of
https://github.com/photonstorm/phaser
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40 lines
834 B
TypeScript
40 lines
834 B
TypeScript
/// <reference path="../../Game.ts" />
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/**
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* Phaser - Easing
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*
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* @desc Based heavily on tween.js by sole (https://github.com/sole/tween.js)
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*
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* @version 1.0 - 11th January 2013
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*
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* @author Richard Davey, TypeScript conversion and Phaser integration. See Phaser.TweenManager for the full tween.js author list
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*/
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module Phaser.Easing {
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export class Exponential {
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public static In(k) {
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return k === 0 ? 0 : Math.pow(1024, k - 1);
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}
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public static Out(k) {
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return k === 1 ? 1 : 1 - Math.pow(2, -10 * k);
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}
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public static InOut(k) {
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if (k === 0) return 0;
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if (k === 1) return 1;
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if ((k *= 2) < 1) return 0.5 * Math.pow(1024, k - 1);
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return 0.5 * (-Math.pow(2, -10 * (k - 1)) + 2);
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}
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}
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}
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