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22 KiB
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<h1 class="page-title">Source: tween/Easing.js</h1>
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<section>
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<article>
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<pre class="sunlight-highlight-javascript linenums">/* jshint curly: false */
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/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2013 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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/**
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* A collection of easing methods defining ease-in ease-out curves.
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*
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* @class Phaser.Easing
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*/
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Phaser.Easing = {
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/**
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* Linear easing.
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*
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* @class Phaser.Easing.Linear
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*/
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Linear: {
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/**
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* Ease-in.
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*
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* @method Phaser.Easing.Linear#In
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* @param {number} k - The value to be tweened.
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* @returns {number} k^2.
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*/
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None: function ( k ) {
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return k;
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}
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},
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/**
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* Quadratic easing.
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*
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* @class Phaser.Easing.Quadratic
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*/
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Quadratic: {
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/**
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* Ease-in.
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*
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* @method Phaser.Easing.Quadratic#In
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* @param {number} k - The value to be tweened.
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* @returns {number} k^2.
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*/
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In: function ( k ) {
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return k * k;
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},
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/**
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* Ease-out.
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*
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* @method Phaser.Easing.Quadratic#Out
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* @param {number} k - The value to be tweened.
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* @returns {number} k* (2-k).
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*/
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Out: function ( k ) {
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return k * ( 2 - k );
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},
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/**
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* Ease-in/out.
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*
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* @method Phaser.Easing.Quadratic#InOut
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* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
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*/
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InOut: function ( k ) {
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if ( ( k *= 2 ) < 1 ) return 0.5 * k * k;
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return - 0.5 * ( --k * ( k - 2 ) - 1 );
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}
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},
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/**
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* Cubic easing.
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*
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* @class Phaser.Easing.Cubic
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*/
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Cubic: {
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/**
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* Cubic ease-in.
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*
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* @method Phaser.Easing.Cubic#In
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* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
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*/
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In: function ( k ) {
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return k * k * k;
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},
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/**
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* Cubic ease-out.
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*
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* @method Phaser.Easing.Cubic#Out
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* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
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*/
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Out: function ( k ) {
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return --k * k * k + 1;
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},
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/**
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* Cubic ease-in/out.
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*
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* @method Phaser.Easing.Cubic#InOut
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* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
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*/
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InOut: function ( k ) {
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if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k;
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return 0.5 * ( ( k -= 2 ) * k * k + 2 );
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}
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},
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/**
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* Quartic easing.
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*
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* @class Phaser.Easing.Quartic
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*/
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Quartic: {
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/**
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* Quartic ease-in.
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*
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* @method Phaser.Easing.Quartic#In
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* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
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*/
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In: function ( k ) {
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return k * k * k * k;
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},
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/**
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* Quartic ease-out.
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*
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* @method Phaser.Easing.Quartic#Out
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* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
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*/
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Out: function ( k ) {
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return 1 - ( --k * k * k * k );
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},
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/**
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* Quartic ease-in/out.
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*
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* @method Phaser.Easing.Quartic#InOut
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* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
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*/
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InOut: function ( k ) {
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if ( ( k *= 2 ) < 1) return 0.5 * k * k * k * k;
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return - 0.5 * ( ( k -= 2 ) * k * k * k - 2 );
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}
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},
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/**
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* Quintic easing.
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*
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* @class Phaser.Easing.Quintic
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*/
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Quintic: {
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/**
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* Quintic ease-in.
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*
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* @method Phaser.Easing.Quintic#In
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* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
|
|
*/
|
|
In: function ( k ) {
|
|
|
|
return k * k * k * k * k;
|
|
|
|
},
|
|
|
|
/**
|
|
* Quintic ease-out.
|
|
*
|
|
* @method Phaser.Easing.Quintic#Out
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
Out: function ( k ) {
|
|
|
|
return --k * k * k * k * k + 1;
|
|
|
|
},
|
|
|
|
/**
|
|
* Quintic ease-in/out.
|
|
*
|
|
* @method Phaser.Easing.Quintic#InOut
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
InOut: function ( k ) {
|
|
|
|
if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k * k * k;
|
|
return 0.5 * ( ( k -= 2 ) * k * k * k * k + 2 );
|
|
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* Sinusoidal easing.
|
|
*
|
|
* @class Phaser.Easing.Sinusoidal
|
|
*/
|
|
Sinusoidal: {
|
|
|
|
/**
|
|
* Sinusoidal ease-in.
|
|
*
|
|
* @method Phaser.Easing.Sinusoidal#In
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
In: function ( k ) {
|
|
|
|
return 1 - Math.cos( k * Math.PI / 2 );
|
|
|
|
},
|
|
|
|
/**
|
|
* Sinusoidal ease-out.
|
|
*
|
|
* @method Phaser.Easing.Sinusoidal#Out
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
Out: function ( k ) {
|
|
|
|
return Math.sin( k * Math.PI / 2 );
|
|
|
|
},
|
|
|
|
/**
|
|
* Sinusoidal ease-in/out.
|
|
*
|
|
* @method Phaser.Easing.Sinusoidal#InOut
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
InOut: function ( k ) {
|
|
|
|
return 0.5 * ( 1 - Math.cos( Math.PI * k ) );
|
|
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* Exponential easing.
|
|
*
|
|
* @class Phaser.Easing.Exponential
|
|
*/
|
|
Exponential: {
|
|
|
|
/**
|
|
* Exponential ease-in.
|
|
*
|
|
* @method Phaser.Easing.Exponential#In
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
In: function ( k ) {
|
|
|
|
return k === 0 ? 0 : Math.pow( 1024, k - 1 );
|
|
|
|
},
|
|
|
|
/**
|
|
* Exponential ease-out.
|
|
*
|
|
* @method Phaser.Easing.Exponential#Out
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
Out: function ( k ) {
|
|
|
|
return k === 1 ? 1 : 1 - Math.pow( 2, - 10 * k );
|
|
|
|
},
|
|
|
|
/**
|
|
* Exponential ease-in/out.
|
|
*
|
|
* @method Phaser.Easing.Exponential#InOut
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
InOut: 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 );
|
|
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* Circular easing.
|
|
*
|
|
* @class Phaser.Easing.Circular
|
|
*/
|
|
Circular: {
|
|
|
|
/**
|
|
* Circular ease-in.
|
|
*
|
|
* @method Phaser.Easing.Circular#In
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
In: function ( k ) {
|
|
|
|
return 1 - Math.sqrt( 1 - k * k );
|
|
|
|
},
|
|
|
|
/**
|
|
* Circular ease-out.
|
|
*
|
|
* @method Phaser.Easing.Circular#Out
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
Out: function ( k ) {
|
|
|
|
return Math.sqrt( 1 - ( --k * k ) );
|
|
|
|
},
|
|
|
|
/**
|
|
* Circular ease-in/out.
|
|
*
|
|
* @method Phaser.Easing.Circular#InOut
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
InOut: 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);
|
|
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* Elastic easing.
|
|
*
|
|
* @class Phaser.Easing.Elastic
|
|
*/
|
|
Elastic: {
|
|
|
|
/**
|
|
* Elastic ease-in.
|
|
*
|
|
* @method Phaser.Easing.Elastic#In
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
In: function ( k ) {
|
|
|
|
var s, a = 0.1, 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 ) );
|
|
|
|
},
|
|
|
|
/**
|
|
* Elastic ease-out.
|
|
*
|
|
* @method Phaser.Easing.Elastic#Out
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
Out: function ( k ) {
|
|
|
|
var s, a = 0.1, 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 );
|
|
|
|
},
|
|
|
|
/**
|
|
* Elastic ease-in/out.
|
|
*
|
|
* @method Phaser.Easing.Elastic#InOut
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
InOut: function ( k ) {
|
|
|
|
var s, a = 0.1, 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;
|
|
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* Back easing.
|
|
*
|
|
* @class Phaser.Easing.Back
|
|
*/
|
|
Back: {
|
|
|
|
/**
|
|
* Back ease-in.
|
|
*
|
|
* @method Phaser.Easing.Back#In
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
In: function ( k ) {
|
|
|
|
var s = 1.70158;
|
|
return k * k * ( ( s + 1 ) * k - s );
|
|
|
|
},
|
|
|
|
/**
|
|
* Back ease-out.
|
|
*
|
|
* @method Phaser.Easing.Back#Out
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
Out: function ( k ) {
|
|
|
|
var s = 1.70158;
|
|
return --k * k * ( ( s + 1 ) * k + s ) + 1;
|
|
|
|
},
|
|
|
|
/**
|
|
* Back ease-in/out.
|
|
*
|
|
* @method Phaser.Easing.Back#InOut
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
InOut: 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 );
|
|
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* Bounce easing.
|
|
*
|
|
* @class Phaser.Easing.Bounce
|
|
*/
|
|
Bounce: {
|
|
|
|
/**
|
|
* Bounce ease-in.
|
|
*
|
|
* @method Phaser.Easing.Bounce#In
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
In: function ( k ) {
|
|
|
|
return 1 - Phaser.Easing.Bounce.Out( 1 - k );
|
|
|
|
},
|
|
|
|
/**
|
|
* Bounce ease-out.
|
|
*
|
|
* @method Phaser.Easing.Bounce#Out
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
Out: 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;
|
|
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* Bounce ease-in/out.
|
|
*
|
|
* @method Phaser.Easing.Bounce#InOut
|
|
* @param {number} k - The value to be tweened.
|
|
* @returns {number} The tweened value.
|
|
*/
|
|
InOut: function ( k ) {
|
|
|
|
if ( k < 0.5 ) return Phaser.Easing.Bounce.In( k * 2 ) * 0.5;
|
|
return Phaser.Easing.Bounce.Out( k * 2 - 1 ) * 0.5 + 0.5;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
};
|
|
</pre>
|
|
</article>
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</section>
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<footer>
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<span class="copyright">
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|
Phaser Copyright © 2012-2013 Photon Storm Ltd.
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</span>
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<br />
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<span class="jsdoc-message">
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.0-dev</a>
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on Thu Nov 28 2013 15:56:25 GMT-0000 (GMT) using the <a href="https://github.com/terryweiss/docstrap">DocStrap template</a>.
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