Based on jQuery UI Effects Easing demo, extended easeOutIn.
Which project use easeOutIn, anime v1.1.1
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/******************************************************************************/ /*********************************** EASING ***********************************/ /******************************************************************************/ (function() { // based on easing equations from Robert Penner (http://www.robertpenner.com/easing) var baseEasings = {}; $.each( [ "Quad", "Cubic", "Quart", "Quint", "Expo" ], function( i, name ) { baseEasings[ name ] = function( p ) { return Math.pow( p, i + 2 ); }; }); $.extend( baseEasings, { Sine: function( p ) { return 1 - Math.cos( p * Math.PI / 2 ); }, Circ: function( p ) { return 1 - Math.sqrt( 1 - p * p ); }, Elastic: function( p ) { return p === 0 || p === 1 ? p : -Math.pow( 2, 8 * (p - 1) ) * Math.sin( ( (p - 1) * 80 - 7.5 ) * Math.PI / 15 ); }, Back: function( p ) { return p * p * ( 3 * p - 2 ); }, Bounce: function( p ) { var pow2, bounce = 4; while ( p < ( ( pow2 = Math.pow( 2, --bounce ) ) - 1 ) / 11 ) {} return 1 / Math.pow( 4, 3 - bounce ) - 7.5625 * Math.pow( ( pow2 * 3 - 2 ) / 22 - p, 2 ); } }); $.each( baseEasings, function( name, easeIn ) { $.easing[ "easeIn" + name ] = easeIn; $.easing[ "easeOut" + name ] = function( p ) { return 1 - easeIn( 1 - p ); }; $.easing[ "easeInOut" + name ] = function( p ) { return p < 0.5 ? easeIn( p * 2 ) / 2 : 1 - easeIn( 2 - 2 *p) / 2; }; $.easing[ "easeOutIn" + name ] = function( p ) { return p < 0.5 ? 0.5 * (1 - easeIn( 1 - 2 *p )): 0.5 * easeIn(p * 2 - 1) + 0.5; }; }); })();