Easing Functions 不及格的程序员

Robert Penner's Easing Functions

A collection of swappable functions that add flavor to motion. 

Visualize

• Easing Cheat Sheet for jQuery, CSS, SCSS
• Easing Function Generator

Learn

• Tweening chapter of my book
• Ease Yourself Into Animation (great preso)
• Understanding Easing: Explaining Penner's Equations
• Interpolation Tricks

Code 

• JavaScript
• jQuery Easing Plugin
• CSS, SCSS, LESS (用手托动控制点形成曲线)
• ActionScript 3.0 (single class)
• ActionScript 3.0 (classes)
• CoffeeScript
• Java
• Lua
• C#
• C++
• C
• ActionScript 2.0 
• ActionScript 1.0

Fork

Open Source under BSD License

---

/*
 * jQuery Easing v1.3 - http://gsgd.co.uk/sandbox/jquery/easing/
 *
 * Uses the built in easing capabilities added In jQuery 1.1
 * to offer multiple easing options
 *
 * TERMS OF USE - jQuery Easing
 * 
 * Open source under the BSD License. 
 * 
 * Copyright 漏 2008 George McGinley Smith
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this list of 
 * conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this list 
 * of conditions and the following disclaimer in the documentation and/or other materials 
 * provided with the distribution.
 * 
 * Neither the name of the author nor the names of contributors may be used to endorse 
 * or promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
 * OF THE POSSIBILITY OF SUCH DAMAGE. 
 *
*/

// t: current time, b: begInnIng value, c: change In value, d: duration
jQuery.easing['jswing'] = jQuery.easing['swing'];

jQuery.extend( jQuery.easing,
{
    def: 'easeOutQuad',
    swing: function (x, t, b, c, d) {
        //alert(jQuery.easing.default);
        return jQuery.easing[jQuery.easing.def](x, t, b, c, d);
    },
    easeInQuad: function (x, t, b, c, d) {
        return c*(t/=d)*t + b;
    },
    easeOutQuad: function (x, t, b, c, d) {
        return -c *(t/=d)*(t-2) + b;
    },
    easeInOutQuad: function (x, t, b, c, d) {
        if ((t/=d/2) < 1) return c/2*t*t + b;
        return -c/2 * ((--t)*(t-2) - 1) + b;
    },
    easeInCubic: function (x, t, b, c, d) {
        return c*(t/=d)*t*t + b;
    },
    easeOutCubic: function (x, t, b, c, d) {
        return c*((t=t/d-1)*t*t + 1) + b;
    },
    easeInOutCubic: function (x, t, b, c, d) {
        if ((t/=d/2) < 1) return c/2*t*t*t + b;
        return c/2*((t-=2)*t*t + 2) + b;
    },
    easeInQuart: function (x, t, b, c, d) {
        return c*(t/=d)*t*t*t + b;
    },
    easeOutQuart: function (x, t, b, c, d) {
        return -c * ((t=t/d-1)*t*t*t - 1) + b;
    },
    easeInOutQuart: function (x, t, b, c, d) {
        if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
        return -c/2 * ((t-=2)*t*t*t - 2) + b;
    },
    easeInQuint: function (x, t, b, c, d) {
        return c*(t/=d)*t*t*t*t + b;
    },
    easeOutQuint: function (x, t, b, c, d) {
        return c*((t=t/d-1)*t*t*t*t + 1) + b;
    },
    easeInOutQuint: function (x, t, b, c, d) {
        if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
        return c/2*((t-=2)*t*t*t*t + 2) + b;
    },
    easeInSine: function (x, t, b, c, d) {
        return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
    },
    easeOutSine: function (x, t, b, c, d) {
        return c * Math.sin(t/d * (Math.PI/2)) + b;
    },
    easeInOutSine: function (x, t, b, c, d) {
        return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
    },
    easeInExpo: function (x, t, b, c, d) {
        return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
    },
    easeOutExpo: function (x, t, b, c, d) {
        return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
    },
    easeInOutExpo: function (x, t, b, c, d) {
        if (t==0) return b;
        if (t==d) return b+c;
        if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
        return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
    },
    easeInCirc: function (x, t, b, c, d) {
        return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
    },
    easeOutCirc: function (x, t, b, c, d) {
        return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
    },
    easeInOutCirc: function (x, t, b, c, d) {
        if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
        return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
    },
    easeInElastic: function (x, t, b, c, d) {
        var s=1.70158;var p=0;var a=c;
        if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
        if (a < Math.abs(c)) { a=c; var s=p/4; }
        else var s = p/(2*Math.PI) * Math.asin (c/a);
        return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
    },
    easeOutElastic: function (x, t, b, c, d) {
        var s=1.70158;var p=0;var a=c;
        if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
        if (a < Math.abs(c)) { a=c; var s=p/4; }
        else var s = p/(2*Math.PI) * Math.asin (c/a);
        return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
    },
    easeInOutElastic: function (x, t, b, c, d) {
        var s=1.70158;var p=0;var a=c;
        if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) p=d*(.3*1.5);
        if (a < Math.abs(c)) { a=c; var s=p/4; }
        else var s = p/(2*Math.PI) * Math.asin (c/a);
        if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
        return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
    },
    easeInBack: function (x, t, b, c, d, s) {
        if (s == undefined) s = 1.70158;
        return c*(t/=d)*t*((s+1)*t - s) + b;
    },
    easeOutBack: function (x, t, b, c, d, s) {
        if (s == undefined) s = 1.70158;
        return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
    },
    easeInOutBack: function (x, t, b, c, d, s) {
        if (s == undefined) s = 1.70158; 
        if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
        return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
    },
    easeInBounce: function (x, t, b, c, d) {
        return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b;
    },
    easeOutBounce: function (x, t, b, c, d) {
        if ((t/=d) < (1/2.75)) {
            return c*(7.5625*t*t) + b;
        } else if (t < (2/2.75)) {
            return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
        } else if (t < (2.5/2.75)) {
            return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
        } else {
            return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
        }
    },
    easeInOutBounce: function (x, t, b, c, d) {
        if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
        return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
    }
});

/*
 *
 * TERMS OF USE - EASING EQUATIONS
 * 
 * Open source under the BSD License. 
 * 
 * Copyright 漏 2001 Robert Penner
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this list of 
 * conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this list 
 * of conditions and the following disclaimer in the documentation and/or other materials 
 * provided with the distribution.
 * 
 * Neither the name of the author nor the names of contributors may be used to endorse 
 * or promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
 * OF THE POSSIBILITY OF SUCH DAMAGE. 
 *
 */

//
// Easing mixins
//
// created with Ceaser : http://matthewlein.com/ceaser/
// --------------------------------------------------

#ease {

  @durationDefault: 1000ms;

  .linear(@duration: @durationDefault) {
    -webkit-transition: all @duration linear;
       -moz-transition: all @duration linear;
        -ms-transition: all @duration linear;
         -o-transition: all @duration linear;
            transition: all @duration linear;
  }

  .ease(@duration: @durationDefault) {
    -webkit-transition: all @duration ease;
       -moz-transition: all @duration ease;
        -ms-transition: all @duration ease;
         -o-transition: all @duration ease;
            transition: all @duration ease;
  }

  .ease-in(@duration: @durationDefault) {
    -webkit-transition: all @duration ease-in;
       -moz-transition: all @duration ease-in;
        -ms-transition: all @duration ease-in;
         -o-transition: all @duration ease-in;
            transition: all @duration ease-in;
  }

  .ease-out(@duration: @durationDefault) {
    -webkit-transition: all @duration ease-out;
       -moz-transition: all @duration ease-out;
        -ms-transition: all @duration ease-out;
         -o-transition: all @duration ease-out;
            transition: all @duration ease-out;
  }

  .ease-in-out(@duration: @durationDefault) {
    -webkit-transition: all @duration ease-in-out;
       -moz-transition: all @duration ease-in-out;
        -ms-transition: all @duration ease-in-out;
         -o-transition: all @duration ease-in-out;
            transition: all @duration ease-in-out;
  }

  .easeInQuad(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.550, 0.085, 0.680, 0.530);
       -moz-transition: all @duration cubic-bezier(0.550, 0.085, 0.680, 0.530);
        -ms-transition: all @duration cubic-bezier(0.550, 0.085, 0.680, 0.530);
         -o-transition: all @duration cubic-bezier(0.550, 0.085, 0.680, 0.530);
            transition: all @duration cubic-bezier(0.550, 0.085, 0.680, 0.530);
  }

  .easeInCubic(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.550, 0.055, 0.675, 0.190);
       -moz-transition: all @duration cubic-bezier(0.550, 0.055, 0.675, 0.190);
        -ms-transition: all @duration cubic-bezier(0.550, 0.055, 0.675, 0.190);
         -o-transition: all @duration cubic-bezier(0.550, 0.055, 0.675, 0.190);
            transition: all @duration cubic-bezier(0.550, 0.055, 0.675, 0.190);
  }

  .easeInQuart(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.895, 0.030, 0.685, 0.220);
       -moz-transition: all @duration cubic-bezier(0.895, 0.030, 0.685, 0.220);
        -ms-transition: all @duration cubic-bezier(0.895, 0.030, 0.685, 0.220);
         -o-transition: all @duration cubic-bezier(0.895, 0.030, 0.685, 0.220);
            transition: all @duration cubic-bezier(0.895, 0.030, 0.685, 0.220);
  }

  .easeInQuint(@duration: @durationDefault) {
   -webkit-transition: all @duration cubic-bezier(0.755, 0.050, 0.855, 0.060);
     -moz-transition: all @duration cubic-bezier(0.755, 0.050, 0.855, 0.060);
      -ms-transition: all @duration cubic-bezier(0.755, 0.050, 0.855, 0.060);
       -o-transition: all @duration cubic-bezier(0.755, 0.050, 0.855, 0.060);
          transition: all @duration cubic-bezier(0.755, 0.050, 0.855, 0.060);
  }

  .easeInSine(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.470, 0.000, 0.745, 0.715);
       -moz-transition: all @duration cubic-bezier(0.470, 0.000, 0.745, 0.715);
        -ms-transition: all @duration cubic-bezier(0.470, 0.000, 0.745, 0.715);
         -o-transition: all @duration cubic-bezier(0.470, 0.000, 0.745, 0.715);
            transition: all @duration cubic-bezier(0.470, 0.000, 0.745, 0.715);
  }

  .easeInExpo(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.950, 0.050, 0.795, 0.035);
       -moz-transition: all @duration cubic-bezier(0.950, 0.050, 0.795, 0.035);
        -ms-transition: all @duration cubic-bezier(0.950, 0.050, 0.795, 0.035);
         -o-transition: all @duration cubic-bezier(0.950, 0.050, 0.795, 0.035);
            transition: all @duration cubic-bezier(0.950, 0.050, 0.795, 0.035);
  }

  .easeInCirc(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.600, 0.040, 0.980, 0.335);
       -moz-transition: all @duration cubic-bezier(0.600, 0.040, 0.980, 0.335);
        -ms-transition: all @duration cubic-bezier(0.600, 0.040, 0.980, 0.335);
         -o-transition: all @duration cubic-bezier(0.600, 0.040, 0.980, 0.335);
            transition: all @duration cubic-bezier(0.600, 0.040, 0.980, 0.335);
  }

  .easeInBack(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.600, 0, 0.735, 0.045); // older webkit
    -webkit-transition: all @duration cubic-bezier(0.600, -0.280, 0.735, 0.045);
       -moz-transition: all @duration cubic-bezier(0.600, -0.280, 0.735, 0.045);
        -ms-transition: all @duration cubic-bezier(0.600, -0.280, 0.735, 0.045);
         -o-transition: all @duration cubic-bezier(0.600, -0.280, 0.735, 0.045);
            transition: all @duration cubic-bezier(0.600, -0.280, 0.735, 0.045);
  }

  .easeOutQuad(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.250, 0.460, 0.450, 0.940);
       -moz-transition: all @duration cubic-bezier(0.250, 0.460, 0.450, 0.940);
        -ms-transition: all @duration cubic-bezier(0.250, 0.460, 0.450, 0.940);
         -o-transition: all @duration cubic-bezier(0.250, 0.460, 0.450, 0.940);
            transition: all @duration cubic-bezier(0.250, 0.460, 0.450, 0.940);
  }

  .easeOutCubic(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.215, 0.610, 0.355, 1.000);
       -moz-transition: all @duration cubic-bezier(0.215, 0.610, 0.355, 1.000);
        -ms-transition: all @duration cubic-bezier(0.215, 0.610, 0.355, 1.000);
         -o-transition: all @duration cubic-bezier(0.215, 0.610, 0.355, 1.000);
            transition: all @duration cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  .easeOutQuart(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.165, 0.840, 0.440, 1.000);
       -moz-transition: all @duration cubic-bezier(0.165, 0.840, 0.440, 1.000);
        -ms-transition: all @duration cubic-bezier(0.165, 0.840, 0.440, 1.000);
         -o-transition: all @duration cubic-bezier(0.165, 0.840, 0.440, 1.000);
            transition: all @duration cubic-bezier(0.165, 0.840, 0.440, 1.000);
  }

  .easeOutQuint(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.230, 1.000, 0.320, 1.000);
       -moz-transition: all @duration cubic-bezier(0.230, 1.000, 0.320, 1.000);
        -ms-transition: all @duration cubic-bezier(0.230, 1.000, 0.320, 1.000);
         -o-transition: all @duration cubic-bezier(0.230, 1.000, 0.320, 1.000);
            transition: all @duration cubic-bezier(0.230, 1.000, 0.320, 1.000);
  }

  .easeOutSine(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.390, 0.575, 0.565, 1.000);
       -moz-transition: all @duration cubic-bezier(0.390, 0.575, 0.565, 1.000);
        -ms-transition: all @duration cubic-bezier(0.390, 0.575, 0.565, 1.000);
         -o-transition: all @duration cubic-bezier(0.390, 0.575, 0.565, 1.000);
            transition: all @duration cubic-bezier(0.390, 0.575, 0.565, 1.000);
  }

  .easeOutExpo(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.190, 1.000, 0.220, 1.000);
       -moz-transition: all @duration cubic-bezier(0.190, 1.000, 0.220, 1.000);
        -ms-transition: all @duration cubic-bezier(0.190, 1.000, 0.220, 1.000);
         -o-transition: all @duration cubic-bezier(0.190, 1.000, 0.220, 1.000);
            transition: all @duration cubic-bezier(0.190, 1.000, 0.220, 1.000);
  }

  .easeOutCirc(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.075, 0.820, 0.165, 1.000);
       -moz-transition: all @duration cubic-bezier(0.075, 0.820, 0.165, 1.000);
        -ms-transition: all @duration cubic-bezier(0.075, 0.820, 0.165, 1.000);
         -o-transition: all @duration cubic-bezier(0.075, 0.820, 0.165, 1.000);
            transition: all @duration cubic-bezier(0.075, 0.820, 0.165, 1.000);
  }

  .easeOutBack(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.175, 0.885, 0.320, 1); // older webkit
    -webkit-transition: all @duration cubic-bezier(0.175, 0.885, 0.320, 1.275);
       -moz-transition: all @duration cubic-bezier(0.175, 0.885, 0.320, 1.275);
        -ms-transition: all @duration cubic-bezier(0.175, 0.885, 0.320, 1.275);
         -o-transition: all @duration cubic-bezier(0.175, 0.885, 0.320, 1.275);
            transition: all @duration cubic-bezier(0.175, 0.885, 0.320, 1.275);
  }

  .easeInOutQuad(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.455, 0.030, 0.515, 0.955);
       -moz-transition: all @duration cubic-bezier(0.455, 0.030, 0.515, 0.955);
        -ms-transition: all @duration cubic-bezier(0.455, 0.030, 0.515, 0.955);
         -o-transition: all @duration cubic-bezier(0.455, 0.030, 0.515, 0.955);
            transition: all @duration cubic-bezier(0.455, 0.030, 0.515, 0.955);
  }

  .easeInOutCubic(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.645, 0.045, 0.355, 1.000);
       -moz-transition: all @duration cubic-bezier(0.645, 0.045, 0.355, 1.000);
        -ms-transition: all @duration cubic-bezier(0.645, 0.045, 0.355, 1.000);
         -o-transition: all @duration cubic-bezier(0.645, 0.045, 0.355, 1.000);
            transition: all @duration cubic-bezier(0.645, 0.045, 0.355, 1.000);
  }

  .easeInOutQuart(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.770, 0.000, 0.175, 1.000);
       -moz-transition: all @duration cubic-bezier(0.770, 0.000, 0.175, 1.000);
        -ms-transition: all @duration cubic-bezier(0.770, 0.000, 0.175, 1.000);
         -o-transition: all @duration cubic-bezier(0.770, 0.000, 0.175, 1.000);
            transition: all @duration cubic-bezier(0.770, 0.000, 0.175, 1.000);
  }

  .easeInOutQuint(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.860, 0.000, 0.070, 1.000);
       -moz-transition: all @duration cubic-bezier(0.860, 0.000, 0.070, 1.000);
        -ms-transition: all @duration cubic-bezier(0.860, 0.000, 0.070, 1.000);
         -o-transition: all @duration cubic-bezier(0.860, 0.000, 0.070, 1.000);
            transition: all @duration cubic-bezier(0.860, 0.000, 0.070, 1.000);
  }

  .easeInOutSine(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.445, 0.050, 0.550, 0.950);
       -moz-transition: all @duration cubic-bezier(0.445, 0.050, 0.550, 0.950);
        -ms-transition: all @duration cubic-bezier(0.445, 0.050, 0.550, 0.950);
         -o-transition: all @duration cubic-bezier(0.445, 0.050, 0.550, 0.950);
            transition: all @duration cubic-bezier(0.445, 0.050, 0.550, 0.950);
  }

  .easeInOutExpo(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(1.000, 0.000, 0.000, 1.000);
       -moz-transition: all @duration cubic-bezier(1.000, 0.000, 0.000, 1.000);
        -ms-transition: all @duration cubic-bezier(1.000, 0.000, 0.000, 1.000);
         -o-transition: all @duration cubic-bezier(1.000, 0.000, 0.000, 1.000);
            transition: all @duration cubic-bezier(1.000, 0.000, 0.000, 1.000);
  }

  .easeInOutCirc(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.785, 0.135, 0.150, 0.860);
       -moz-transition: all @duration cubic-bezier(0.785, 0.135, 0.150, 0.860);
        -ms-transition: all @duration cubic-bezier(0.785, 0.135, 0.150, 0.860);
         -o-transition: all @duration cubic-bezier(0.785, 0.135, 0.150, 0.860);
            transition: all @duration cubic-bezier(0.785, 0.135, 0.150, 0.860);
  }

  .easeInOutBack(@duration: @durationDefault) {
    -webkit-transition: all @duration cubic-bezier(0.680, 0, 0.265, 1); // older webkit
    -webkit-transition: all @duration cubic-bezier(0.680, -0.550, 0.265, 1.550);
       -moz-transition: all @duration cubic-bezier(0.680, -0.550, 0.265, 1.550);
        -ms-transition: all @duration cubic-bezier(0.680, -0.550, 0.265, 1.550);
         -o-transition: all @duration cubic-bezier(0.680, -0.550, 0.265, 1.550);
            transition: all @duration cubic-bezier(0.680, -0.550, 0.265, 1.550);
  }

}