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<h1 class="page-title">Source: tween/Easing.js</h1>
<section>
<article>
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<pre class="sunlight-highlight-javascript linenums">/* jshint curly: false */
/**
* @author Richard Davey &lt;rich@photonstorm.com>
2014-02-05 06:29:17 +00:00
* @copyright 2014 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* A collection of easing methods defining ease-in ease-out curves.
*
* @class Phaser.Easing
*/
Phaser.Easing = {
/**
* Linear easing.
*
* @class Phaser.Easing.Linear
*/
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Linear: {
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/**
* Ease-in.
*
* @method Phaser.Easing.Linear#In
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* @param {number} k - The value to be tweened.
* @returns {number} k^2.
*/
None: function ( k ) {
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return k;
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}
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},
/**
* Quadratic easing.
*
* @class Phaser.Easing.Quadratic
*/
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Quadratic: {
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/**
* Ease-in.
*
* @method Phaser.Easing.Quadratic#In
* @param {number} k - The value to be tweened.
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* @returns {number} k^2.
*/
In: function ( k ) {
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return k * k;
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},
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/**
* Ease-out.
*
* @method Phaser.Easing.Quadratic#Out
* @param {number} k - The value to be tweened.
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* @returns {number} k* (2-k).
*/
Out: function ( k ) {
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return k * ( 2 - k );
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},
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/**
* Ease-in/out.
*
* @method Phaser.Easing.Quadratic#InOut
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
InOut: function ( k ) {
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if ( ( k *= 2 ) &lt; 1 ) return 0.5 * k * k;
return - 0.5 * ( --k * ( k - 2 ) - 1 );
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}
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},
/**
* Cubic easing.
*
* @class Phaser.Easing.Cubic
*/
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Cubic: {
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/**
* Cubic ease-in.
*
* @method Phaser.Easing.Cubic#In
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
In: function ( k ) {
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return k * k * k;
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},
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/**
* Cubic ease-out.
*
* @method Phaser.Easing.Cubic#Out
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
Out: function ( k ) {
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return --k * k * k + 1;
2013-11-28 15:57:09 +00:00
},
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/**
* Cubic ease-in/out.
*
* @method Phaser.Easing.Cubic#InOut
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
InOut: function ( k ) {
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if ( ( k *= 2 ) &lt; 1 ) return 0.5 * k * k * k;
return 0.5 * ( ( k -= 2 ) * k * k + 2 );
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
},
/**
* Quartic easing.
*
* @class Phaser.Easing.Quartic
*/
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Quartic: {
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/**
* Quartic ease-in.
*
* @method Phaser.Easing.Quartic#In
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
In: function ( k ) {
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return k * k * k * k;
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Quartic ease-out.
*
* @method Phaser.Easing.Quartic#Out
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
Out: function ( k ) {
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return 1 - ( --k * k * k * k );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Quartic ease-in/out.
*
* @method Phaser.Easing.Quartic#InOut
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
InOut: function ( k ) {
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if ( ( k *= 2 ) &lt; 1) return 0.5 * k * k * k * k;
return - 0.5 * ( ( k -= 2 ) * k * k * k - 2 );
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
},
/**
* Quintic easing.
*
* @class Phaser.Easing.Quintic
*/
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Quintic: {
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/**
* Quintic ease-in.
*
* @method Phaser.Easing.Quintic#In
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
In: function ( k ) {
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return k * k * k * k * k;
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Quintic ease-out.
*
* @method Phaser.Easing.Quintic#Out
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
Out: function ( k ) {
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return --k * k * k * k * k + 1;
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Quintic ease-in/out.
*
* @method Phaser.Easing.Quintic#InOut
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
InOut: function ( k ) {
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if ( ( k *= 2 ) &lt; 1 ) return 0.5 * k * k * k * k * k;
return 0.5 * ( ( k -= 2 ) * k * k * k * k + 2 );
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
},
/**
* Sinusoidal easing.
*
* @class Phaser.Easing.Sinusoidal
*/
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Sinusoidal: {
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/**
* Sinusoidal ease-in.
*
* @method Phaser.Easing.Sinusoidal#In
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
In: function ( k ) {
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return 1 - Math.cos( k * Math.PI / 2 );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Sinusoidal ease-out.
*
* @method Phaser.Easing.Sinusoidal#Out
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
Out: function ( k ) {
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return Math.sin( k * Math.PI / 2 );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Sinusoidal ease-in/out.
*
* @method Phaser.Easing.Sinusoidal#InOut
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
InOut: function ( k ) {
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return 0.5 * ( 1 - Math.cos( Math.PI * k ) );
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
},
/**
* Exponential easing.
*
* @class Phaser.Easing.Exponential
*/
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Exponential: {
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/**
* Exponential ease-in.
*
* @method Phaser.Easing.Exponential#In
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
In: function ( k ) {
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return k === 0 ? 0 : Math.pow( 1024, k - 1 );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Exponential ease-out.
*
* @method Phaser.Easing.Exponential#Out
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
Out: function ( k ) {
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return k === 1 ? 1 : 1 - Math.pow( 2, - 10 * k );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Exponential ease-in/out.
*
* @method Phaser.Easing.Exponential#InOut
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
InOut: function ( k ) {
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if ( k === 0 ) return 0;
if ( k === 1 ) return 1;
if ( ( k *= 2 ) &lt; 1 ) return 0.5 * Math.pow( 1024, k - 1 );
return 0.5 * ( - Math.pow( 2, - 10 * ( k - 1 ) ) + 2 );
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
},
/**
* Circular easing.
*
* @class Phaser.Easing.Circular
*/
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Circular: {
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/**
* Circular ease-in.
*
* @method Phaser.Easing.Circular#In
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
In: function ( k ) {
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return 1 - Math.sqrt( 1 - k * k );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Circular ease-out.
*
* @method Phaser.Easing.Circular#Out
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
Out: function ( k ) {
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return Math.sqrt( 1 - ( --k * k ) );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Circular ease-in/out.
*
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* @method Phaser.Easing.Circular#InOut
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
InOut: function ( k ) {
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if ( ( k *= 2 ) &lt; 1) return - 0.5 * ( Math.sqrt( 1 - k * k) - 1);
return 0.5 * ( Math.sqrt( 1 - ( k -= 2) * k) + 1);
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
},
/**
* Elastic easing.
*
* @class Phaser.Easing.Elastic
*/
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Elastic: {
/**
* Elastic ease-in.
*
* @method Phaser.Easing.Elastic#In
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
In: function ( k ) {
var s, a = 0.1, p = 0.4;
if ( k === 0 ) return 0;
if ( k === 1 ) return 1;
if ( !a || a &lt; 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.
*
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* @method Phaser.Easing.Elastic#Out
* @param {number} k - The value to be tweened.
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* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
Out: function ( k ) {
var s, a = 0.1, p = 0.4;
if ( k === 0 ) return 0;
if ( k === 1 ) return 1;
if ( !a || a &lt; 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.
*
2013-11-28 15:57:09 +00:00
* @method Phaser.Easing.Elastic#InOut
* @param {number} k - The value to be tweened.
2013-11-28 15:57:09 +00:00
* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
InOut: function ( k ) {
var s, a = 0.1, p = 0.4;
if ( k === 0 ) return 0;
if ( k === 1 ) return 1;
if ( !a || a &lt; 1 ) { a = 1; s = p / 4; }
else s = p * Math.asin( 1 / a ) / ( 2 * Math.PI );
if ( ( k *= 2 ) &lt; 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
*/
2013-11-28 15:57:09 +00:00
Back: {
2013-11-28 15:57:09 +00:00
/**
* Back ease-in.
*
* @method Phaser.Easing.Back#In
* @param {number} k - The value to be tweened.
2013-11-28 15:57:09 +00:00
* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
In: function ( k ) {
2013-11-28 15:57:09 +00:00
var s = 1.70158;
return k * k * ( ( s + 1 ) * k - s );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Back ease-out.
*
2013-11-28 15:57:09 +00:00
* @method Phaser.Easing.Back#Out
* @param {number} k - The value to be tweened.
2013-11-28 15:57:09 +00:00
* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
Out: function ( k ) {
2013-11-28 15:57:09 +00:00
var s = 1.70158;
return --k * k * ( ( s + 1 ) * k + s ) + 1;
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Back ease-in/out.
*
2013-11-28 15:57:09 +00:00
* @method Phaser.Easing.Back#InOut
* @param {number} k - The value to be tweened.
2013-11-28 15:57:09 +00:00
* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
InOut: function ( k ) {
2013-11-28 15:57:09 +00:00
var s = 1.70158 * 1.525;
if ( ( k *= 2 ) &lt; 1 ) return 0.5 * ( k * k * ( ( s + 1 ) * k - s ) );
return 0.5 * ( ( k -= 2 ) * k * ( ( s + 1 ) * k + s ) + 2 );
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
},
/**
* Bounce easing.
*
* @class Phaser.Easing.Bounce
*/
2013-11-28 15:57:09 +00:00
Bounce: {
2013-11-28 15:57:09 +00:00
/**
* Bounce ease-in.
*
* @method Phaser.Easing.Bounce#In
* @param {number} k - The value to be tweened.
2013-11-28 15:57:09 +00:00
* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
In: function ( k ) {
2013-11-28 15:57:09 +00:00
return 1 - Phaser.Easing.Bounce.Out( 1 - k );
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Bounce ease-out.
*
2013-11-28 15:57:09 +00:00
* @method Phaser.Easing.Bounce#Out
* @param {number} k - The value to be tweened.
2013-11-28 15:57:09 +00:00
* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
Out: function ( k ) {
2013-11-28 15:57:09 +00:00
if ( k &lt; ( 1 / 2.75 ) ) {
2013-11-28 15:57:09 +00:00
return 7.5625 * k * k;
2013-11-28 15:57:09 +00:00
} else if ( k &lt; ( 2 / 2.75 ) ) {
2013-11-28 15:57:09 +00:00
return 7.5625 * ( k -= ( 1.5 / 2.75 ) ) * k + 0.75;
2013-11-28 15:57:09 +00:00
} else if ( k &lt; ( 2.5 / 2.75 ) ) {
2013-11-28 15:57:09 +00:00
return 7.5625 * ( k -= ( 2.25 / 2.75 ) ) * k + 0.9375;
2013-11-28 15:57:09 +00:00
} else {
2013-11-28 15:57:09 +00:00
return 7.5625 * ( k -= ( 2.625 / 2.75 ) ) * k + 0.984375;
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
},
2013-11-28 15:57:09 +00:00
/**
* Bounce ease-in/out.
*
2013-11-28 15:57:09 +00:00
* @method Phaser.Easing.Bounce#InOut
* @param {number} k - The value to be tweened.
2013-11-28 15:57:09 +00:00
* @returns {number} The tweened value.
*/
2013-11-28 15:57:09 +00:00
InOut: function ( k ) {
2013-11-28 15:57:09 +00:00
if ( k &lt; 0.5 ) return Phaser.Easing.Bounce.In( k * 2 ) * 0.5;
return Phaser.Easing.Bounce.Out( k * 2 - 1 ) * 0.5 + 0.5;
2013-11-28 15:57:09 +00:00
}
2013-11-28 15:57:09 +00:00
}
};
</pre>
</article>
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2014-02-05 06:29:17 +00:00
Phaser Copyright © 2012-2014 Photon Storm Ltd.
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