phaser/Phaser/tweens/easing/Quartic.ts
Richard Davey e74114f384 Docs
2013-08-12 00:52:35 +01:00

61 lines
1.3 KiB
TypeScript

/// <reference path="../../_definitions.ts" />
/**
* @author Richard Davey <rich@photonstorm.com>
* @author sole (http://soledadpenades.com), tween.js
* @copyright 2013 Photon Storm Ltd.
* @license https://github.com/photonstorm/phaser/blob/master/license.txt MIT License
* @module Phaser
*/
module Phaser.Easing {
/**
* Quartic easing methods.
*
* @class Quartic
*/
export class Quartic {
/**
* The In ease method.
*
* @method In
* @param {Number} k The value to ease.
* @return {Number} The eased value.
*/
public static In(k) {
return k * k * k * k;
}
/**
* The Out ease method.
*
* @method Out
* @param {Number} k The value to ease.
* @return {Number} The eased value.
*/
public static Out(k) {
return 1 - (--k * k * k * k);
}
/**
* The InOut ease method.
*
* @method InOut
* @param {Number} k The value to ease.
* @return {Number} The eased value.
*/
public static InOut(k) {
if ((k *= 2) < 1) return 0.5 * k * k * k * k;
return -0.5 * ((k -= 2) * k * k * k - 2);
}
}
}