!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.collide=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
(function (process){
// Generated by CoffeeScript 1.6.3
(function() {
  var getNanoSeconds, hrtime, loadTime;

  if ((typeof performance !== "undefined" && performance !== null) && performance.now) {
    module.exports = function() {
      return performance.now();
    };
  } else if ((typeof process !== "undefined" && process !== null) && process.hrtime) {
    module.exports = function() {
      return (getNanoSeconds() - loadTime) / 1e6;
    };
    hrtime = process.hrtime;
    getNanoSeconds = function() {
      var hr;
      hr = hrtime();
      return hr[0] * 1e9 + hr[1];
    };
    loadTime = getNanoSeconds();
  } else if (Date.now) {
    module.exports = function() {
      return Date.now() - loadTime;
    };
    loadTime = Date.now();
  } else {
    module.exports = function() {
      return new Date().getTime() - loadTime;
    };
    loadTime = new Date().getTime();
  }

}).call(this);

/*
//@ sourceMappingURL=performance-now.map
*/

}).call(this,_dereq_("qhDIRT"))
},{"qhDIRT":13}],2:[function(_dereq_,module,exports){
var now = _dereq_('performance-now')
  , global = typeof window === 'undefined' ? {} : window
  , vendors = ['moz', 'webkit']
  , suffix = 'AnimationFrame'
  , raf = global['request' + suffix]
  , caf = global['cancel' + suffix] || global['cancelRequest' + suffix]

for(var i = 0; i < vendors.length && !raf; i++) {
  raf = global[vendors[i] + 'Request' + suffix]
  caf = global[vendors[i] + 'Cancel' + suffix]
      || global[vendors[i] + 'CancelRequest' + suffix]
}

// Some versions of FF have rAF but not cAF
if(!raf || !caf) {
  var last = 0
    , id = 0
    , queue = []
    , frameDuration = 1000 / 60

  raf = function(callback) {
    if(queue.length === 0) {
      var _now = now()
        , next = Math.max(0, frameDuration - (_now - last))
      last = next + _now
      setTimeout(function() {
        var cp = queue.slice(0)
        // Clear queue here to prevent
        // callbacks from appending listeners
        // to the current frame's queue
        queue.length = 0
        for (var i = 0; i < cp.length; i++) {
          if (!cp[i].cancelled) {
            cp[i].callback(last)
          }
        }
      }, next)
    }
    queue.push({
      handle: ++id,
      callback: callback,
      cancelled: false
    })
    return id
  }

  caf = function(handle) {
    for(var i = 0; i < queue.length; i++) {
      if(queue[i].handle === handle) {
        queue[i].cancelled = true
      }
    }
  }
}

module.exports = function() {
  // Wrap in a new function to prevent
  // `cancel` potentially being assigned
  // to the native rAF function
  return raf.apply(global, arguments)
}
module.exports.cancel = function() {
  caf.apply(global, arguments)
}

},{"performance-now":3}],3:[function(_dereq_,module,exports){
module.exports=_dereq_(1)
},{"qhDIRT":13}],4:[function(_dereq_,module,exports){

// Interpolation disabled for now
// var interpolate = require('./core/interpolate');
// var cssFeature = require('feature/css');

var timeline = _dereq_('./core/timeline');
var dynamics = _dereq_('./core/dynamics');
var easingFunctions = _dereq_('./core/easing-functions');

var uid = _dereq_('./util/uid');
var EventEmitter = _dereq_('./util/simple-emitter');

function clamp(min, n, max) { return Math.max(min, Math.min(n, max)); }

module.exports = Animator;

function Animator(opts) {
  //if `new` keyword isn't provided, do it for user
  if (!(this instanceof Animator)) {
    return new Animator(opts);
  }

  opts = opts || {};

  //Private state goes in this._
  this._ = {
    id: uid(),
    percent: 0,
    duration: 500,
    isReverse: false
  };

  var emitter = this._.emitter = new EventEmitter();
  this._.onDestroy = function() {
    emitter.emit('destroy');
  };
  this._.onStop = function(wasCompleted) {
    emitter.emit('stop', wasCompleted);
    wasCompleted && emitter.emit('complete');
  };
  this._.onStart = function() {
    emitter.emit('start');
  };
  this._.onStep = function(v) {
    emitter.emit('step', v);
  };

  opts.duration && this.duration(opts.duration);
  opts.percent && this.percent(opts.percent);
  opts.easing && this.easing(opts.easing);
  opts.reverse && this.reverse(opts.reverse);
}

Animator.prototype = {

  reverse: function(reverse) {
    if (arguments.length) {
      this._.isReverse = !!reverse;
      return this;
    }
    return this._.isReverse;
  },

  easing: function(easing) {
    var type = typeof easing;
    if (arguments.length) {
      if (type === 'function' || type === 'string' || type === 'object') {
        this._.easing = figureOutEasing(easing);
      }
      return this;
    }
    return this._.easing;
  },

  percent: function(percent) {
    if (arguments.length) {
      if (typeof percent === 'number') {
        this._.percent = clamp(0, percent, 1);
      }
      if (!this.isRunning()) {
        this._.onStep(this._getValueForPercent(this._.percent));
      }
      return this;
    }
    return this._.percent;
  },

  duration: function(duration) {
    if (arguments.length) {
      if (typeof duration === 'number' && duration > 0) {
        this._.duration = duration;
      }
      return this;
    }
    return this._.duration;
  },

  /**
   * Interpolation is disabled for now.
   */
  // addInterpolation: function(el, startingStyles, endingStyles) {
  //   var interpolators;
  //   if (arguments.length) {
  //     syncStyles(startingStyles, endingStyles, window.getComputedStyle(el));
  //     interpolators = makePropertyInterpolators(startingStyles, endingStyles);

  //     this.on('step', setStyles);
  //     return function unbind() {
  //       this.off('step', setStyles);
  //     };
  //   }
  //   function setStyles(v) {
  //     for (var property in interpolators) {
  //       el.style[property] = interpolators[property](v);
  //     }
  //   }
  // },

  isRunning: function() { 
    return !!this._.isRunning; 
  },

  promise: function() {
    var self = this;
    return {
      then: function(cb) {
        self.once('stop', cb);
      }
    };
  },

  on: function(eventType, listener) {
    this._.emitter.on(eventType, listener);
    return this;
  },
  once: function(eventType, listener) {
    this._.emitter.once(eventType, listener);
    return this;
  },
  off: function(eventType, listener) {
    this._.emitter.off(eventType, listener);
    return this;
  },

  destroy: function() {
    this.stop();
    this._.onDestroy();
    this.off();
    return this;
  },

  stop: function() {
    if (!this._.isRunning) return;

    this._.isRunning = false;
    timeline.animationStopped(this);

    this._.onStop(this._isComplete());
    return this;
  },

  restart: function(immediate) {
    if (this._.isRunning) return;

    this._.percent = this._getStartPercent();

    return this.start(!!immediate);
  },

  start: function(immediate) {
    if (this._.isRunning) return;

    if (immediate) {
      this._.onStep(this._getValueForPercent(this._.percent));
    } else {
      this._.isStarting = true;
    }

    this._.isRunning = true;
    timeline.animationStarted(this);

    this._.onStart();
    return this;
  },

  _isComplete: function() {
    return !this._.isRunning && 
      this._.percent === this._getEndPercent();
  },
  _getEndPercent: function() {
    return this._.isReverse ? 0 : 1;
  },
  _getStartPercent: function() {
    return this._.isReverse ? 1 : 0;
  },

  _getValueForPercent: function(percent) {
    if (this._.easing) {
      return this._.easing(percent, this._.duration);
    }
    return percent;
  },

  _tick: function(deltaT) {
    var state = this._;

    //First tick, don't up the percent
    if (state.isStarting) {
      state.isStarting = false;
    } else if (state.isReverse) {
      state.percent = Math.max(0, state.percent - (deltaT / state.duration));
    } else {
      state.percent = Math.min(1, state.percent + (deltaT / state.duration));
    }
    
    state.onStep(this._getValueForPercent(state.percent));

    if (state.percent === this._getEndPercent()) {
      this.stop();
    }
  },

};

function figureOutEasing(easing) {
  if (typeof easing === 'object') {
    var dynamicType = typeof easing.type === 'string' &&
      easing.type.toLowerCase().trim();

    if (!dynamics[dynamicType]) {
      throw new Error(
        'Invalid easing dynamics object type "' + easing.type + '". ' +
        'Available dynamics types: ' + Object.keys(dynamics).join(', ') + '.'
      );
    }
    return dynamics[dynamicType](easing);

  } else if (typeof easing === 'string') {
    easing = easing.toLowerCase().trim();
    
    if (easing.indexOf('cubic-bezier(') === 0) {
      var parts = easing
        .replace('cubic-bezier(', '')
        .replace(')', '')
        .split(',')
        .map(function(v) {
          return v.trim();
        });
      return easingFunctions['cubic-bezier'](parts[0], parts[1], parts[2], parts[3]);
    } else {
      var fn = easingFunctions[easing];
      if (!fn) {
        throw new Error(
          'Invalid easing function "' + easing + '". ' +
          'Available easing functions: ' + Object.keys(easingFunctions).join(', ') + '.'
        );
      }
      return easingFunctions[easing]();
    }
  } else if (typeof easing === 'function') {
    return easing;
  }
}

// /*
//  * Tweening helpers
//  */
// function syncStyles(startingStyles, endingStyles, computedStyle) {
//   var property;
//   for (property in startingStyles) {
//     if (!endingStyles.hasOwnProperty(property)) {
//       delete startingStyles[property];
//     }
//   }
//   for (property in endingStyles) {
//     if (!startingStyles.hasOwnProperty(property)) {
//       startingStyles[property] = computedStyle[vendorizePropertyName(property)];
//     }
//   }
// }

// function makePropertyInterpolators(startingStyles, endingStyles) {
//   var interpolators = {};
//   var property;
//   for (property in startingStyles) {
//     interpolators[vendorizePropertyName(property)] = interpolate.propertyInterpolator(
//       property, startingStyles[property], endingStyles[property]
//     );
//   }
//   return interpolators;
// }

// var transformProperty;
// function vendorizePropertyName(property) {
//   if (property === 'transform') {
//     //Set transformProperty lazily, to be sure DOM has loaded already when using it
//     return transformProperty || 
//       (transformProperty = cssFeature('transform').property);
//   } else {
//     return property;
//   }
// }

},{"./core/dynamics":6,"./core/easing-functions":7,"./core/timeline":8,"./util/simple-emitter":11,"./util/uid":12}],5:[function(_dereq_,module,exports){
/*
 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
 */

// http://www.w3.org/TR/css3-transitions/#transition-easing-function
module.exports =  {
  /*
   * @param x {number} the value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param duration {number} the duration of the animation in milliseconds
   * @return {number} the y value along the bezier curve
   */
  linear: unitBezier(0.0, 0.0, 1.0, 1.0),

  /*
   * @param x {number} the value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param duration {number} the duration of the animation in milliseconds
   * @return {number} the y value along the bezier curve
   */
  ease: unitBezier(0.25, 0.1, 0.25, 1.0),

  /*
   * @param x {number} the value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param duration {number} the duration of the animation in milliseconds
   * @return {number} the y value along the bezier curve
   */
  easeIn: unitBezier(0.42, 0, 1.0, 1.0),

  /*
   * @param x {number} the value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param duration {number} the duration of the animation in milliseconds
   * @return {number} the y value along the bezier curve
   */
  easeOut: unitBezier(0, 0, 0.58, 1.0),

  /*
   * @param x {number} the value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param duration {number} the duration of the animation in milliseconds
   * @return {number} the y value along the bezier curve
   */
  easeInOut: unitBezier(0.42, 0, 0.58, 1.0),

  /*
   * @param p1x {number} X component of control point 1
   * @param p1y {number} Y component of control point 1
   * @param p2x {number} X component of control point 2
   * @param p2y {number} Y component of control point 2
   * @param x {number} the value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param duration {number} the duration of the animation in milliseconds
   * @return {number} the y value along the bezier curve
   */
  cubicBezier: function(p1x, p1y, p2x, p2y) {
    return unitBezier(p1x, p1y, p2x, p2y);
  }
};

function B1(t) { return t*t*t; }
function B2(t) { return 3*t*t*(1-t); }
function B3(t) { return 3*t*(1-t)*(1-t); }
function B4(t) { return (1-t)*(1-t)*(1-t); }

/*
 * JavaScript port of Webkit implementation of CSS cubic-bezier(p1x.p1y,p2x,p2y) by http://mck.me
 * http://svn.webkit.org/repository/webkit/trunk/Source/WebCore/platform/graphics/UnitBezier.h
 */

/*
 * Duration value to use when one is not specified (400ms is a common value).
 * @const
 * @type {number}
 */
var DEFAULT_DURATION = 400;//ms

/*
 * The epsilon value we pass to UnitBezier::solve given that the animation is going to run over |dur| seconds.
 * The longer the animation, the more precision we need in the easing function result to avoid ugly discontinuities.
 * http://svn.webkit.org/repository/webkit/trunk/Source/WebCore/page/animation/AnimationBase.cpp
 */
function solveEpsilon(duration) {
  return 1.0 / (200.0 * duration);
}

/*
 * Defines a cubic-bezier curve given the middle two control points.
 * NOTE: first and last control points are implicitly (0,0) and (1,1).
 * @param p1x {number} X component of control point 1
 * @param p1y {number} Y component of control point 1
 * @param p2x {number} X component of control point 2
 * @param p2y {number} Y component of control point 2
 */
function unitBezier(p1x, p1y, p2x, p2y) {

  // private members --------------------------------------------

  // Calculate the polynomial coefficients, implicit first and last control points are (0,0) and (1,1).

  /*
   * X component of Bezier coefficient C
   * @const
   * @type {number}
   */
  var cx = 3.0 * p1x;

  /*
   * X component of Bezier coefficient B
   * @const
   * @type {number}
   */
  var bx = 3.0 * (p2x - p1x) - cx;

  /*
   * X component of Bezier coefficient A
   * @const
   * @type {number}
   */
  var ax = 1.0 - cx -bx;

  /*
   * Y component of Bezier coefficient C
   * @const
   * @type {number}
   */
  var cy = 3.0 * p1y;

  /*
   * Y component of Bezier coefficient B
   * @const
   * @type {number}
   */
  var by = 3.0 * (p2y - p1y) - cy;

  /*
   * Y component of Bezier coefficient A
   * @const
   * @type {number}
   */
  var ay = 1.0 - cy - by;

  /*
   * @param t {number} parametric easing value
   * @return {number}
   */
  var sampleCurveX = function(t) {
    // `ax t^3 + bx t^2 + cx t' expanded using Horner's rule.
    return ((ax * t + bx) * t + cx) * t;
  };

  /*
   * @param t {number} parametric easing value
   * @return {number}
   */
  var sampleCurveY = function(t) {
    return ((ay * t + by) * t + cy) * t;
  };

  /*
   * @param t {number} parametric easing value
   * @return {number}
   */
  var sampleCurveDerivativeX = function(t) {
    return (3.0 * ax * t + 2.0 * bx) * t + cx;
  };

  /*
   * Given an x value, find a parametric value it came from.
   * @param x {number} value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param epsilon {number} accuracy limit of t for the given x
   * @return {number} the t value corresponding to x
   */
  var solveCurveX = function(x, epsilon) {
    var t0;
    var t1;
    var t2;
    var x2;
    var d2;
    var i;

    // First try a few iterations of Newton's method -- normally very fast.
    for (t2 = x, i = 0; i < 8; i++) {
      x2 = sampleCurveX(t2) - x;
      if (Math.abs (x2) < epsilon) {
        return t2;
      }
      d2 = sampleCurveDerivativeX(t2);
      if (Math.abs(d2) < 1e-6) {
        break;
      }
      t2 = t2 - x2 / d2;
    }

    // Fall back to the bisection method for reliability.
    t0 = 0.0;
    t1 = 1.0;
    t2 = x;

    if (t2 < t0) {
      return t0;
    }
    if (t2 > t1) {
      return t1;
    }

    while (t0 < t1) {
      x2 = sampleCurveX(t2);
      if (Math.abs(x2 - x) < epsilon) {
        return t2;
      }
      if (x > x2) {
        t0 = t2;
      } else {
        t1 = t2;
      }
      t2 = (t1 - t0) * 0.5 + t0;
    }

    // Failure.
    return t2;
  };

  /*
   * @param x {number} the value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param epsilon {number} the accuracy of t for the given x
   * @return {number} the y value along the bezier curve
   */
  var solve = function(x, epsilon) {
    return sampleCurveY(solveCurveX(x, epsilon));
  };

  // public interface --------------------------------------------

  /*
   * Find the y of the cubic-bezier for a given x with accuracy determined by the animation duration.
   * @param x {number} the value of x along the bezier curve, 0.0 <= x <= 1.0
   * @param duration {number} the duration of the animation in milliseconds
   * @return {number} the y value along the bezier curve
   */
  return function(x, duration) {
    return solve(x, solveEpsilon(+duration || DEFAULT_DURATION));
  };
}


},{}],6:[function(_dereq_,module,exports){
/**
 * A HUGE thank you to dynamics.js which inspired these dynamics simulations.
 * https://github.com/michaelvillar/dynamics.js
 *
 * Also licensed under MIT
 */

var extend = _dereq_('../util/extend');

module.exports = {
  spring: dynamicsSpring,
  gravity: dynamicsGravity
};

var springDefaults = {
  frequency: 15,
  friction: 200,
  anticipationStrength: 0,
  anticipationSize: 0
};
function dynamicsSpring(opts) {
  opts = extend({}, springDefaults, opts || {});

  return function at(t, duration) {
    var A, At, a, angle, b, decal, frequency, friction, frictionT, s, v, y0, yS,
    _opts = opts;
    frequency = Math.max(1, opts.frequency);
    friction = Math.pow(20, opts.friction / 100);
    s = opts.anticipationSize / 100;
    decal = Math.max(0, s);
    frictionT = (t / (1 - s)) - (s / (1 - s));
    if (t < s) {
      A = function(t) {
        var M, a, b, x0, x1;
        M = 0.8;
        x0 = s / (1 - s);
        x1 = 0;
        b = (x0 - (M * x1)) / (x0 - x1);
        a = (M - b) / x0;
        return (a * t * _opts.anticipationStrength / 100) + b;
      };
      yS = (s / (1 - s)) - (s / (1 - s));
      y0 = (0 / (1 - s)) - (s / (1 - s));
      b = Math.acos(1 / A(yS));
      a = (Math.acos(1 / A(y0)) - b) / (frequency * (-s));
    } else {
      A = function(t) {
        return Math.pow(friction / 10, -t) * (1 - t);
      };
      b = 0;
      a = 1;
    }
    At = A(frictionT);
    angle = frequency * (t - s) * a + b;
    v = 1 - (At * Math.cos(angle));
    //return [t, v, At, frictionT, angle];
    return v;
  };
}

var gravityDefaults = {
  bounce: 40,
  gravity: 1000,
  initialForce: false
};
function dynamicsGravity(opts) {
  opts = extend({}, gravityDefaults, opts || {});
  var curves = [];

  init();

  return at;

  function length() {
    var L, b, bounce, curve, gravity;
    bounce = Math.min(opts.bounce / 100, 80);
    gravity = opts.gravity / 100;
    b = Math.sqrt(2 / gravity);
    curve = {
      a: -b,
      b: b,
      H: 1
    };
    if (opts.initialForce) {
      curve.a = 0;
      curve.b = curve.b * 2;
    }
    while (curve.H > 0.001) {
      L = curve.b - curve.a;
      curve = {
        a: curve.b,
        b: curve.b + L * bounce,
        H: curve.H * bounce * bounce
      };
    }
    return curve.b;
  }

  function init() {
    var L, b, bounce, curve, gravity, _results;

    L = length();
    gravity = (opts.gravity / 100) * L * L;
    bounce = Math.min(opts.bounce / 100, 80);
    b = Math.sqrt(2 / gravity);
    curves = [];
    curve = {
      a: -b,
      b: b,
      H: 1
    };
    if (opts.initialForce) {
      curve.a = 0;
      curve.b = curve.b * 2;
    }
    curves.push(curve);
    _results = [];
    while (curve.b < 1 && curve.H > 0.001) {
      L = curve.b - curve.a;
      curve = {
        a: curve.b,
        b: curve.b + L * bounce,
        H: curve.H * bounce * bounce
      };
      _results.push(curves.push(curve));
    }
    return _results;
  }

  function calculateCurve(a, b, H, t){
    var L, c, t2;
    L = b - a;
    t2 = (2 / L) * t - 1 - (a * 2 / L);
    c = t2 * t2 * H - H + 1;
    if (opts.initialForce) {
      c = 1 - c;
    }
    return c;
  }

  function at(t, duration) {
    var bounce, curve, gravity, i, v;
    bounce = opts.bounce / 100;
    gravity = opts.gravity;
    i = 0;
    curve = curves[i];
    while (!(t >= curve.a && t <= curve.b)) {
      i += 1;
      curve = curves[i];
      if (!curve) {
        break;
      }
    }
    if (!curve) {
      v = opts.initialForce ? 0 : 1;
    } else {
      v = calculateCurve(curve.a, curve.b, curve.H, t);
    }
    //return [t, v];
    return v;
  }

};

},{"../util/extend":10}],7:[function(_dereq_,module,exports){
var dynamics = _dereq_('./dynamics');
var bezier = _dereq_('./bezier');

module.exports = {
  'linear': function() {
    return function(t, duration) {
      return bezier.linear(t, duration);
    };
  },
  'ease': function() {
    return function(t, duration) {
      return bezier.ease(t, duration);
    };
  },
  'ease-in': function() {
    return function(t, duration) {
      return bezier.easeIn(t, duration);
    };
  },
  'ease-out': function() {
    return function(t, duration) {
      return bezier.easeOut(t, duration);
    };
  },
  'ease-in-out': function() {
    return function(t, duration) {
      return bezier.easeInOut(t, duration);
    };
  },
  'cubic-bezier': function(x1, y1, x2, y2, duration) {
    var bz = bezier.cubicBezier(x1, y1, x2, y2);//, t, duration);
    return function(t, duration) {
      return bz(t, duration);
    };
  }
};

},{"./bezier":5,"./dynamics":6}],8:[function(_dereq_,module,exports){

var raf = _dereq_('raf');
var time = _dereq_('performance-now');

var self = module.exports = {
  _running: {},

  animationStarted: function(instance) {
    self._running[instance._.id] = instance;

    if (!self.isTicking) {
      self.tick();
    }
  },

  animationStopped: function(instance) {
    delete self._running[instance._.id];
    self.maybeStopTicking();
  },

  tick: function() {
    var lastFrame = time();

    self.isTicking = true;
    self._rafId = raf(step);

    function step() {
      self._rafId = raf(step);

      // Get current time
      var now = time();
      var deltaT = now - lastFrame;

      for (var animationId in self._running) {
        self._running[animationId]._tick(deltaT);
      }

      lastFrame = now;
    }
  },

  maybeStopTicking: function() {
    if (self.isTicking && !Object.keys(self._running).length) {
      raf.cancel(self._rafId);
      self.isTicking = false;
    }
  },

};


},{"performance-now":1,"raf":2}],9:[function(_dereq_,module,exports){
module.exports = {
  animator: _dereq_('./animator')
};

},{"./animator":4}],10:[function(_dereq_,module,exports){

/*
 * There really is no tiny minimal extend() on npm to find,
 * so we just use our own.
 */

module.exports = function extend(obj) {
   var args = Array.prototype.slice.call(arguments, 1);
   for(var i = 0; i < args.length; i++) {
     var source = args[i];
     if (source) {
       for (var prop in source) {
         obj[prop] = source[prop];
       }
     }
   }
   return obj;
};

},{}],11:[function(_dereq_,module,exports){

// All we want is an eventEmitter that doesn't use #call or #apply,
// by expecting 0-1 arguments. 
// We couldn't find this on npm, so we make our own.

module.exports = SimpleEventEmitter;

function SimpleEventEmitter() {
}

SimpleEventEmitter.prototype = {
  listeners: [],
  on: function(eventType, fn) {
    if (typeof fn !== 'function') return;
    this.listeners[eventType] || (this.listeners[eventType] = []);
    this.listeners[eventType].push(fn);
  },
  once: function(eventType, fn) {
    var self = this;
    function onceFn() {
      self.off(eventType, fn);
      self.off(eventType, onceFn);
    }
    this.on(eventType, fn);
    this.on(eventType, onceFn);
  },
  // Built-in limitation: we only expect 0-1 arguments
  // This is to save as much perf as possible when sending
  // events every frame.
  emit: function(eventType, eventArg) {
    var listeners = this.listeners[eventType] || [];
    var i = 0;
    var len = listeners.length;
    if (arguments.length === 2) {
      for (i; i < len; i++) listeners[i] && listeners[i](eventArg);
    } else {
      for (i; i < len; i++) listeners[i] && listeners[i]();
    }
  },
  off: function(eventType, fnToRemove) {
    if (!eventType) {
      //Remove all listeners
      for (var type in this.listeners) {
        this.off(type);
      }
    } else  {
      var listeners = this.listeners[eventType];
      if (listeners) {
        if (!fnToRemove) {
          listeners.length = 0;
        } else {
          var index = listeners.indexOf(fnToRemove);
          listeners.splice(index, 1);
        }
      }
    }
  } 
};

},{}],12:[function(_dereq_,module,exports){

/**
 * nextUid() from angular.js
 * License MIT
 * http://github.com/angular/angular.js
 *
 * A consistent way of creating unique IDs in angular. The ID is a sequence of alpha numeric
 * characters such as '012ABC'. The reason why we are not using simply a number counter is that
 * the number string gets longer over time, and it can also overflow, where as the nextId
 * will grow much slower, it is a string, and it will never overflow.
 *
 * @returns an unique alpha-numeric string
 */
var uid = [];

module.exports = function nextUid() {
  var index = uid.length;
  var digit;

  while(index) {
    index--;
    digit = uid[index].charCodeAt(0);
    if (digit == 57 /*'9'*/) {
      uid[index] = 'A';
      return uid.join('');
    }
    if (digit == 90  /*'Z'*/) {
      uid[index] = '0';
    } else {
      uid[index] = String.fromCharCode(digit + 1);
      return uid.join('');
    }
  }
  uid.unshift('0');
  return uid.join('');
};

},{}],13:[function(_dereq_,module,exports){
// shim for using process in browser

var process = module.exports = {};

process.nextTick = (function () {
    var canSetImmediate = typeof window !== 'undefined'
    && window.setImmediate;
    var canPost = typeof window !== 'undefined'
    && window.postMessage && window.addEventListener
    ;

    if (canSetImmediate) {
        return function (f) { return window.setImmediate(f) };
    }

    if (canPost) {
        var queue = [];
        window.addEventListener('message', function (ev) {
            var source = ev.source;
            if ((source === window || source === null) && ev.data === 'process-tick') {
                ev.stopPropagation();
                if (queue.length > 0) {
                    var fn = queue.shift();
                    fn();
                }
            }
        }, true);

        return function nextTick(fn) {
            queue.push(fn);
            window.postMessage('process-tick', '*');
        };
    }

    return function nextTick(fn) {
        setTimeout(fn, 0);
    };
})();

process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;

process.binding = function (name) {
    throw new Error('process.binding is not supported');
}

// TODO(shtylman)
process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};

},{}]},{},[9])
(9)
});