Repository: iamvdo/stickyElements
Branch: master
Commit: 185064af6f8f
Files: 12
Total size: 28.0 KB

Directory structure:
gitextract_ihm_xnm8/

├── .gitignore
├── .npmignore
├── README.md
├── build.js
├── dist/
│   ├── stickyelements-animate.js
│   └── stickyelements.js
├── package.json
├── src/
│   ├── StickyElement.js
│   └── stickyElements.js
└── test/
    ├── index.html
    ├── test.html
    └── test.js

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FILE CONTENTS
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FILE: .gitignore
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node_modules


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FILE: .npmignore
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node_modules
demo
test
.gitignore
build.js

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FILE: README.md
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# Sticky Elements

Everything can stick. Just because.

[Demo](http://design.iamvdo.me/stickyElements)

## Getting started

`npm install stickyelements` and insert `dist/stickyelements-animate.js` (or build your own bundle using `src` files)

Then, stick elements!

```javascript
stickyElements('.item', {
  stickiness: 5,
  duration: 450
});

```
## Arguments

### CSS selector

* Elements that will stick to your mouse

### Options

* `stickiness` [Integer, Object]: How long elements remain stick to your mouse. If integer, apply same `x` and `y` values. If object, can contain `x` and/or `y` key. Integer between 0 and 10. (Default: `3`)
* `duration` [Integer]: Duration in milliseconds of animation (using [animateplus](https://github.com/bendc/animateplus). (Default: `450`)
* `pointer` [Boolean]: Enable Pointer Events instead of Mouse Events. Elements will stick to mouse, touch and all input types (Default: `false`). Need [PEP polyfill](https://github.com/jquery/PEP) and `touch-action` attribute on each elements (follow PEP polyfill instructions).


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FILE: build.js
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var fs = require('fs');
var babel  = require('rollup-plugin-babel');
var rollup = require('rollup');
var uglify = require('uglify-js');


var args = process.argv;
var packageFile = JSON.parse(fs.readFileSync('package.json', 'utf8'));
var version = packageFile.version;

var files = {
  src:         './src/stickyElements.js',
  srcAnimate:  './node_modules/animateplus/animate.min.js',
  dist:        './dist/stickyelements.js',
  distAnimate: './dist/stickyelements-animate.js'
}

function minify (code) {
  return uglify.minify(code, {fromString: true}).code;
}

function runBuild () {
  fs.mkdir('./dist', (err) => {
    rollup.rollup({
      entry: files.src,
      plugins: [ babel({presets: [ 'es2015-rollup' ]}) ]
    }).then(function (bundle) {
      var result = bundle.generate({
        format: 'iife',
        moduleName: 'stickyElements'
      });
      var code = minify(result.code);
      fs.writeFile(files.dist, code, 'utf8');
      fs.readFile(files.srcAnimate, 'utf8', (err, animate) => {
        fs.writeFile(files.distAnimate, animate + code, 'utf8');
      });
    }, function (err) {
      console.log(err);
    });
  });
}

runBuild();

if (args[2] && args[2] === '-w') {
  fs.watchFile(files.src, runBuild);
  fs.watchFile('./src/StickyElement.js', runBuild);
}


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FILE: dist/stickyelements-animate.js
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var animate=function(){function F(a){return Array.isArray(a)?a:Array.prototype.slice.call(a)}var k=function(a){var c=a.length;return function d(){for(var e=arguments.length,f=Array(e),g=0;g<e;g++)f[g]=arguments[g];return f.length<c?function(){for(var a=arguments.length,c=Array(a),e=0;e<a;e++)c[e]=arguments[e];return d.apply(void 0,f.concat(c))}:a.apply(void 0,f)}},r=function(){for(var a=arguments.length,c=Array(a),b=0;b<a;b++)c[b]=arguments[b];return function(a){return c.reduce(function(a,b){return b(a)},
a)}},t=function(a){return function(){return!a.apply(void 0,arguments)}},G={linear:function(a,c,b,d){return c+a/d*b},easeInQuad:function(a,c,b,d){return b*(a/=d)*a+c},easeInCubic:function(a,c,b,d){return b*(a/=d)*a*a+c},easeInQuart:function(a,c,b,d){return b*(a/=d)*a*a*a+c},easeInQuint:function(a,c,b,d){return b*(a/=d)*a*a*a*a+c},easeInSine:function(a,c,b,d){return-b*Math.cos(a/d*(Math.PI/2))+b+c},easeInExpo:function(a,c,b,d){return 0==a?c:b*Math.pow(2,10*(a/d-1))+c},easeInCirc:function(a,c,b,d){return-b*
(Math.sqrt(1-(a/=d)*a)-1)+c},easeInElastic:function(a,c,b,d){var e=4>=arguments.length||void 0===arguments[4]?500:arguments[4];if(0==a)return c;if(1==(a/=d))return c+b;var e=d*(1-Math.min(e,999)/1E3),f=b<Math.abs(b)?e/4:e/(2*Math.PI)*Math.asin(b/b);return-(b*Math.pow(2,10*--a)*Math.sin(2*(a*d-f)*Math.PI/e))+c},easeInBack:function(a,c,b,d){return b*(a/=d)*a*(2.70158*a-1.70158)+c},easeOutQuad:function(a,c,b,d){return-b*(a/=d)*(a-2)+c},easeOutCubic:function(a,c,b,d){return b*((a=a/d-1)*a*a+1)+c},easeOutQuart:function(a,
c,b,d){return-b*((a=a/d-1)*a*a*a-1)+c},easeOutQuint:function(a,c,b,d){return b*((a=a/d-1)*a*a*a*a+1)+c},easeOutSine:function(a,c,b,d){return b*Math.sin(a/d*(Math.PI/2))+c},easeOutExpo:function(a,c,b,d){return a==d?c+b:b*(-Math.pow(2,-10*a/d)+1)+c},easeOutCirc:function(a,c,b,d){return b*Math.sqrt(1-(a=a/d-1)*a)+c},easeOutElastic:function(a,c,b,d){var e=4>=arguments.length||void 0===arguments[4]?500:arguments[4];if(0==a)return c;if(1==(a/=d))return c+b;e=d*(1-Math.min(e,999)/1E3);return b*Math.pow(2,
-10*a)*Math.sin(2*(a*d-(b<Math.abs(b)?e/4:e/(2*Math.PI)*Math.asin(b/b)))*Math.PI/e)+b+c},easeOutBack:function(a,c,b,d){return b*((a=a/d-1)*a*(2.70158*a+1.70158)+1)+c},easeOutBounce:function(a,c,b,d){return(a/=d)<1/2.75?7.5625*b*a*a+c:a<2/2.75?b*(7.5625*(a-=1.5/2.75)*a+.75)+c:a<2.5/2.75?b*(7.5625*(a-=2.25/2.75)*a+.9375)+c:b*(7.5625*(a-=2.625/2.75)*a+.984375)+c},easeInOutQuad:function(a,c,b,d){return 1>(a/=d/2)?b/2*a*a+c:-b/2*(--a*(a-2)-1)+c},easeInOutCubic:function(a,c,b,d){return 1>(a/=d/2)?b/2*a*
a*a+c:b/2*((a-=2)*a*a+2)+c},easeInOutQuart:function(a,c,b,d){return 1>(a/=d/2)?b/2*a*a*a*a+c:-b/2*((a-=2)*a*a*a-2)+c},easeInOutQuint:function(a,c,b,d){return 1>(a/=d/2)?b/2*a*a*a*a*a+c:b/2*((a-=2)*a*a*a*a+2)+c},easeInOutSine:function(a,c,b,d){return-b/2*(Math.cos(Math.PI*a/d)-1)+c},easeInOutExpo:function(a,c,b,d){return 0==a?c:a==d?c+b:1>(a/=d/2)?b/2*Math.pow(2,10*(a-1))+c:b/2*(-Math.pow(2,-10*--a)+2)+c},easeInOutCirc:function(a,c,b,d){return 1>(a/=d/2)?-b/2*(Math.sqrt(1-a*a)-1)+c:b/2*(Math.sqrt(1-
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2)+c}},y=function(a){return a[0]},H=function(a){return a.reduce(function(a,b){return a.concat(b)})},n=function(){return Array.prototype.includes?function(a,c){return a.includes(c)}:function(a,c){return a.some(function(a){return a===c})}}(),z=function(a){for(var c=arguments.length,b=Array(1<c?c-1:0),d=1;d<c;d++)b[d-1]=arguments[d];var e=H(b);return a.filter(function(a){return t(n)(e,a)})},q=function(){return Array.from?function(a){return Array.from(a.keys())}:function(a){var c=[];a.forEach(function(a,
d){return c.push(d)});return c}}(),I=function(){var a=function(a){var b=new Map;Object.keys(a).forEach(function(d){return b.set(d,a[d])});return b};return function(c){return c instanceof Map?c:a(c)}}(),h=function(){try{if(!(new Map((new Map).set(null,null))).size)throw Error();}catch(a){return function(a){var b=new Map;a.forEach(function(a,c){return b.set(c,a)});return b}}return function(a){return new Map(a)}}(),J=function(a){return/^#/.test(a)},A=function(a){return/^rgb/.test(a)},K=function(){var a=
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a:a.nodeType?[a]:a instanceof NodeList||a instanceof HTMLCollection?[].concat(F(a)):a.get()},m=new Map;"el delay begin complete loop direction".split(" ").forEach(function(a){return m.set(a,null)});m.set("duration",1E3);m.set("easing","easeOutElastic");var L=function(){var a=q(m).filter(function(a){return m.get(a)}),c=function(b){return a.every(function(a){return b.has(a)})},b=function(b){var c=h(b);a.forEach(function(a){c.has(a)||c.set(a,m.get(a))});return c};return function(a){return c(a)?a:b(a)}}(),
M=function(){var a=k(function(a,b){return Array.isArray(a.get(b))}),c=function(b){return p(b).every(a(b))},b=function(b){return p(b).filter(t(a(b)))};return function(a){if(c(a))return a;var e=h(a);b(e).forEach(function(a){return e.set(a,[C.get(a),e.get(a)])});return e}}(),N=function(){var a=function(a){return/\D$/.test(a)},c=k(function(b,c){return a(c)||/scale/.test(b)?c:/rotate|skew/.test(b)?c+"deg":c+"px"}),b=function(b,c){return c.every(function(c){return b.get(c).every(a)})};return function(a){var e=
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a.get("direction")){var c=h(a);c["delete"]("direction");return c}return a}())},l=new Map,Z=function(){var a=0;return function(c){var b=a++,d=h(l);d.set(b,c);l=d;return b}}(),x=function(a){var c=P(a),b=R(c),d=Z(c.get("el")),e=new Map;S(c);X(function g(a){if(l.has(d)){e.has("start")||e.set("start",a);e.set("elapsed",a-e.get("start"));a=e.get("elapsed")<c.get("duration");var k=b.map(a?U(c,e.get("elapsed")):V(c));l.get(d).forEach(W(b,k));a?requestAnimationFrame(g):(a=h(l),a["delete"](d),l=a,c.get("complete")&&
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================================================
FILE: dist/stickyelements.js
================================================
var stickyElements=function(){"use strict";var t={};t.classCallCheck=function(t,s){if(!(t instanceof s))throw new TypeError("Cannot call a class as a function")},t.createClass=function(){function t(t,s){for(var i=0;i<s.length;i++){var e=s[i];e.enumerable=e.enumerable||!1,e.configurable=!0,"value"in e&&(e.writable=!0),Object.defineProperty(t,e.key,e)}}return function(s,i,e){return i&&t(s.prototype,i),e&&t(s,e),s}}();var s=function(){function s(i){var e=arguments.length<=1||void 0===arguments[1]?{}:arguments[1];t.classCallCheck(this,s),this.el=i,this.setOpts(e),this.setEvents()}return t.createClass(s,[{key:"setOpts",value:function(t){this.pointer=t.pointer,this.positions={},this.isGripped=!1,this.stickiness={},this.grip={x:3,y:4},this.duration=t.duration||450,this.setStickiness(t)}},{key:"setEvents",value:function(){var t=this,s=this.el,i=["enter","leave","move"];s._stickyEvents&&(i.map(function(i){t.pointer?s.removeEventListener("pointer"+i,s._stickyEvents[i],!1):s.removeEventListener("mouse"+i,s._stickyEvents[i],!1)}),s._stickyEvents=void 0),s._stickyEvents={enter:function(s){return t.onEnter(s)},leave:function(s){return t.onLeave(s)},move:function(s){return t.onMove(s)}},i.map(function(i){t.pointer?s.addEventListener("pointer"+i,s._stickyEvents[i],!1):s.addEventListener("mouse"+i,s._stickyEvents[i],!1)})}},{key:"setStickiness",value:function(t){var s={1:10,2:6.6,3:4.5,4:3.2,5:2.4,6:1.9,7:1.6,8:1.4,9:1.3,10:1.2,0:0},i={stickiness:{x:3,y:3}};(t.stickiness||0===t.stickiness)&&("number"==typeof t.stickiness&&(i.stickiness={x:t.stickiness,y:t.stickiness}),(t.stickiness.x||0===t.stickiness.x)&&(i.stickiness.x=t.stickiness.x),(t.stickiness.y||0===t.stickiness.y)&&(i.stickiness.y=t.stickiness.y)),this.stickiness.x=s[Math.min(10,i.stickiness.x)],this.stickiness.y=s[Math.min(10,i.stickiness.y)]}},{key:"getPositions",value:function(t,s){var i=0!==this.stickiness.x?t/this.stickiness.x:0,e=0!==this.stickiness.y?s/this.stickiness.y:0;return{posx:i,posy:e}}},{key:"onEnter",value:function(t){var s=this.el,i=s.offsetWidth,e=s.offsetHeight,n=s.offsetLeft,o=s.offsetTop,r=window.pageYOffset||document.documentElement.scrollTop,a={width:i,height:e,centerx:n+i/2,centery:o+e/2-r};this.positions=a}},{key:"onLeave",value:function(t){if(this.lastGripped){var s=(new Date).getTime();if(s-this.lastGripped<30)return}var i=this.el;animate.stop(i);var e=this.getPositions(this.positions.deltax,this.positions.deltay),n=e.posx,o=e.posy;this.isGripped&&(this.lastGripped=(new Date).getTime(),animate({el:i,translateX:[n,0],translateY:[o,0],duration:this.duration})),this.isGripped=!1}},{key:"onMove",value:function(t){var s=this.el;animate.stop(s);var i=t.clientX,e=t.clientY,n={x:Math.abs(this.positions.deltax)<this.positions.width/this.grip.x,y:Math.abs(this.positions.deltay)<this.positions.height/this.grip.y};if(n.x&&n.y&&(this.isGripped=!0),this.positions.deltax=-(this.positions.centerx-i),this.positions.deltay=-(this.positions.centery-e),this.isGripped){var o=this.getPositions(this.positions.deltax,this.positions.deltay),r=o.posx,a=o.posy;s.style.transform="translate3d("+r+"px, "+a+"px, 0)"}}}]),s}(),i=function(){return function(t,i){for(var e=[],n=[].slice.call(document.querySelectorAll(t)),o=0;o<n.length;o++)e.push(new s(n[o],i));return e}}();return i}();

================================================
FILE: package.json
================================================
{
  "name": "stickyelements",
  "version": "2.2.1",
  "description": "Everything sticks. Just because.",
  "main": "dist/stickyelements-animate.js",
  "repository": {
    "type": "git",
    "url": "https://github.com/iamvdo/stickyElements.git"
  },
  "author": "Vincent De Oliveira <vincent@iamvdo.me>",
  "license": "MIT",
  "scripts": {
    "build": "node ./build.js",
    "watch": "node ./build.js -w"
  },
  "devDependencies": {
    "animateplus": "^1.0.0",
    "babel-preset-es2015-rollup": "^1.1.1",
    "mocha": "^2.0.0",
    "rollup": "^0.25.2",
    "rollup-plugin-babel": "^2.3.9",
    "uglify-js": "^2.6.1"
  }
}


================================================
FILE: src/StickyElement.js
================================================
export default class StickyElement {

  constructor (el, opts = {}) {
    this.el = el;
    this.setOpts(opts);
    this.setEvents();
  }

  setOpts (opts) {
    this.pointer = opts.pointer;
    this.positions = {};
    this.isGripped = false;
    this.stickiness = {};
    this.grip = {x: 3, y: 4};
    this.duration = opts.duration || 450;
    this.setStickiness(opts);
  }

  setEvents () {
    let el = this.el;
    const events = ['enter', 'leave', 'move'];
    // prevent events to be registered multiple times
    if (el._stickyEvents) {
      events.map(e => {
        if (this.pointer) {
          el.removeEventListener('pointer' + e, el._stickyEvents[e], false);
        } else {
          el.removeEventListener('mouse' + e, el._stickyEvents[e], false);
        }
      });
      el._stickyEvents = undefined;
    }
    el._stickyEvents = {
      enter: (e) => this.onEnter(e),
      leave: (e) => this.onLeave(e),
      move:  (e) => this.onMove(e)
    };
    
    events.map(e => {
      if (this.pointer) {
        el.addEventListener('pointer' + e, el._stickyEvents[e], false);
      } else {
        el.addEventListener('mouse' + e, el._stickyEvents[e], false);
      }
    });
  }

  setStickiness (opts) {
    const forces = {
      1: 10.0,
      2:  6.6,
      3:  4.5,
      4:  3.2,
      5:  2.4,
      6:  1.9,
      7:  1.6,
      8:  1.4,
      9:  1.3,
      10: 1.2,
      0:  0.0
    };
    let opt = {stickiness: {x: 3, y: 3}};
    // if no options specified
    if (opts.stickiness || opts.stickiness === 0) {
      if (typeof opts.stickiness === "number") {
        opt.stickiness = {x: opts.stickiness, y: opts.stickiness};
      }
      if (opts.stickiness.x || opts.stickiness.x === 0) {
        opt.stickiness.x = opts.stickiness.x;
      }
      if (opts.stickiness.y || opts.stickiness.y === 0) {
        opt.stickiness.y = opts.stickiness.y;
      }
    }
    this.stickiness.x = forces[Math.min(10, opt.stickiness.x)];
    this.stickiness.y = forces[Math.min(10, opt.stickiness.y)];
  }

  getPositions (deltax, deltay) {
    const posx = (this.stickiness.x !== 0) ? deltax / this.stickiness.x : 0;
    const posy = (this.stickiness.y !== 0) ? deltay / this.stickiness.y : 0;
    return {posx, posy};
  }

  onEnter (event) {
    const {offsetWidth, offsetHeight, offsetLeft, offsetTop} = this.el;
    const scrollTop = window.pageYOffset || document.documentElement.scrollTop;
    const positions = {
      width: offsetWidth,
      height: offsetHeight,
      centerx: offsetLeft + (offsetWidth / 2),
      centery: offsetTop + (offsetHeight / 2) - scrollTop
    };
    this.positions = positions;
  }

  onLeave (event) {
    // prevent mouseleave event to be triggered twice by 30ms
    if (this.lastGripped) {
      const now = new Date().getTime();
      if (now - this.lastGripped < 30) {
        return;
      }
    }
    const element = this.el;
    animate.stop(element);

    const {posx, posy} = this.getPositions(this.positions.deltax, this.positions.deltay);

    if (this.isGripped) {
      this.lastGripped = new Date().getTime();
      animate({
        el: element,
        translateX: [posx, 0],
        translateY: [posy, 0],
        duration: this.duration
      });
    }
    this.isGripped = false;
  }

  onMove (event) {
    const element = this.el;
    animate.stop(element);

    const {clientX, clientY} = event;

    const isGrip = {
      x: Math.abs(this.positions.deltax) < (this.positions.width /  this.grip.x),
      y: Math.abs(this.positions.deltay) < (this.positions.height / this.grip.y)
    };

    if (isGrip.x && isGrip.y) {
      this.isGripped = true;
    }

    this.positions.deltax = -(this.positions.centerx - clientX);
    this.positions.deltay = -(this.positions.centery - clientY);

    if (this.isGripped) {
      const {posx, posy} = this.getPositions(this.positions.deltax, this.positions.deltay);
      element.style.transform = 'translate3d(' + posx + 'px, ' + posy + 'px, 0)';
    }
  }
}

================================================
FILE: src/stickyElements.js
================================================
import StickyElement from './StickyElement';

export default (() => {
  return (selector, opts) => {
    const stickyElementsTab = [];
    const elements = [].slice.call(document.querySelectorAll(selector));
    for (let i = 0; i < elements.length; i++) {
      stickyElementsTab.push(new StickyElement(elements[i], opts));
    };
    return stickyElementsTab;
  };
})();


================================================
FILE: test/index.html
================================================
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Live test</title>
  <meta name="viewport" content="width=device-width,initial-scale=1">
  <style>
  a, h1 span {
    display: inline-block;
  }
  button {
    padding: 2em;
    font-size: 2em;
    touch-action: none;
  }
  </style>
</head>
<body>
  <h1><span touch-action="none">Sticky</span> Elements Playground</h1>
  <p>This should be a <a href="#" touch-action="none">sticky link</a>. And another <a href="http://twitter.com/iamvdo">one</a></p>
  <button touch-action="none">Big Fat Touch Button</button>
  <script src="https://code.jquery.com/pep/0.4.1/pep.js"></script>
  <script src="../dist/stickyelements-animate.js"></script>
  <script>
  stickyElements('a, button, h1 span', {stickiness: 5, pointer: true});
  </script>
</body>
</html>

================================================
FILE: test/test.html
================================================
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Tests</title>
  <link rel="stylesheet" href="https://npmcdn.com/mocha@2.3.4/mocha.css">
</head>
<body>
  <div id="mocha"></div>
  <a href="#" class="mocha" style="display:none">Mocha</a>
  <a href="#" class="multiple" style="display:none">Mocha</a>
  <a href="#" class="multiple" style="display:none">Mocha</a>
  <script src="https://npmcdn.com/jquery@2.1.4/dist/jquery.min.js"></script>
  <script src="https://npmcdn.com/expect.js@0.3.1/index.js"></script>
  <script src="https://npmcdn.com/mocha@2.3.4/mocha.js"></script>

  <script src="../dist/stickyelements-animate.js"></script>

  <script>mocha.setup('bdd')</script>
  <script src="test.js"></script>
  <script>
    mocha.checkLeaks();
    mocha.globals(['jQuery']);
    mocha.run();
  </script>
</body>
</html>

================================================
FILE: test/test.js
================================================
describe('stickyElements', function() {
  describe('Lib', function () {
    it('should set one stickyElements', function () {
      var se = stickyElements('.mocha');
      expect(se.length).to.eql(1);
    });
    it('should set multiple stickyElements', function () {
      var se = stickyElements('.multiple');
      expect(se.length).to.eql(2);
    });
    it('should create stickyElements instance', function () {
      var se = stickyElements('.multiple');
      for (var i = 0; i < se.length; i++) {
        expect(se[i]).to.have.keys('el', 'stickiness');
        expect(se[i].el).to.be.an(HTMLElement);
      };
    });
  });
  describe('Options', function () {
    it('should set default options', function () {
      var se = stickyElements('.mocha');
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 4.5, y: 4.5});
    });
    it('should set default options to multiple elements', function () {
      var se = stickyElements('.multiple');
      for (var i = 0; i < se.length; i++) {
        var stickiness = se[i].stickiness;
        expect(stickiness).to.eql({x: 4.5, y: 4.5});
      };
    });
    it('should set default options to multiple elements with options', function () {
      var se = stickyElements('.multiple', {});
      for (var i = 0; i < se.length; i++) {
        var stickiness = se[i].stickiness;
        expect(stickiness).to.eql({x: 4.5, y: 4.5});
      };
    });
    it('should overidde options', function () {
      var se = stickyElements('.mocha', {stickiness: {x: 2, y: 4}});
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 6.6, y: 3.2});
    });
    it('should overidde only X option', function () {
      var se = stickyElements('.mocha', {stickiness: {x: 2}});
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 6.6, y: 4.5});
    });
    it('should overidde only Y option', function () {
      var se = stickyElements('.mocha', {stickiness: {y: 4}});
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 4.5, y: 3.2});
    });
    it('should accept integer', function () {
      var se = stickyElements('.mocha', {stickiness: 2});
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 6.6, y: 6.6});
    });
    it('should accept 0', function () {
      var se = stickyElements('.mocha', {stickiness: 0});
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 0.0, y: 0.0});
    });
    it('should accept 0, only X', function () {
      var se = stickyElements('.mocha', {stickiness: {x: 0}});
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 0.0, y: 4.5});
    });
    it('should accept 0, only Y', function () {
      var se = stickyElements('.mocha', {stickiness: {y: 0}});
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 4.5, y: 0.0});
    });
    it('should limit to 10', function () {
      var se = stickyElements('.mocha', {stickiness: 12});
      var stickiness = se[0].stickiness;
      expect(stickiness).to.eql({x: 1.2, y: 1.2});
    });
  });
});