:ruby
  @items = [
    { :t => 'X-rays', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-xrays.png' },
    { :t => 'Worms', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-worms.png' },
    { :t => 'Aurora', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-aurora.png' },
    { :t => 'Angus', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-angus.png' },
    { :t => 'Huitzi', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-huitzi.png' },
    { :t => 'Dalí', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-dali.png' },
    { :t => 'The Bride', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-bride.png' },
    { :t => 'The Man', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-man.png' },
    { :t => 'D', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-d.png' },
    { :t => 'V', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-v.png' },
    { :t => 'V II', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-v2.png' },
    { :t => 'V III', :i => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/9473/i-v3.png' }
  ]

.container
  %header
    %h1 SVG clip-path Hover Effect
    %p
      Attempt to re-create <a href="http://www.cjgammon.com/" target="_blank">CJ Gammon’s</a>
      portfolio grid hover effect using SVG and CSS Transitions.
    %p.small
      <b>Note:</b> this is an experiment, it does not seem to work on Firefox 43.0.4
      neither have touch support.
      <br/>Tested on Chrome 47.0.2526.106, Opera 34.0 and Safari 8.0.6.
  %main
    .items
      - @items.each_with_index do | item, index |
        .item
          %svg{:viewBox => "0 0 300 200", :preserveAspectRatio => "xMidYMid slice"}
            %defs
              %clipPath{:id => "clip-#{index}"}
                %circle{:cx => "0", :cy => "0", :r => "150px", :fill => "#000"}
            %text{:class => "svg-text", :x => "50%", :y => "50%", :dy => ".3em"}
              #{item[:t]}
            %g{:"clip-path" => "url(#clip-#{index})"}
              %image{"xlink:href" => "#{item[:i]}", :width => "100%", :height => "100%", :preserveAspectRatio => "xMinYMin slice"}
              %text{:class => "svg-masked-text", :x => "50%", :y => "50%", :dy => ".3em"}
                #{item[:t]}
.options
  %button.dark
  %button.light

$db: #2f3238;
$dc: #f5f5f5;
$lb: #f9f9f9;
$lc: #1a1a1a;
$l: #1abc89;

* {margin: 0; box-sizing: border-box;}

:root {
  font-size: 13px;
  font-family: 'Source Sans Pro', sans-serif;
  line-height: 1.618;
  font-weight: 400;
}

body {
  background-color: $db;
  color: $dc;
}

a {color: $l}
a:hover {opacity: .8}

p {
  font-size: 1.2rem;
  color: rgba($dc, .5);
}

.small {
  font-size: 1rem;
  margin-top: 1em;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

header {
  text-align: center;
  padding-bottom: 3rem;
}

h1 {
  font-size: 2.6rem;
  line-height: 1.2em;
  padding-bottom: 1rem;
  font-weight: 600;
}

svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

circle {
  transform-origin: 50% 50%;
  transform: scale(0);
  transition: transform 200ms cubic-bezier(0.250, 0.460, 0.450, 0.940);
}

text {
  font-size: 1.1rem;
  text-transform: uppercase;
  text-anchor: middle;
  letter-spacing: 1px;
  font-weight: 600;
}

.svg-text {fill: lighten($db, 16)}
.svg-masked-text {fill: rgba(#fff, 1);}

image {
  transform: scale(1.1);
  transform-origin: 50% 50%;
  transition: transform 200ms cubic-bezier(0.250, 0.460, 0.450, 0.940);
}

.items {
  display: flex;
  flex-flow: row wrap;
  justify-content: center;
}

.item {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  width: 300px;
  height: 200px;
  margin: 5px;
  cursor: pointer;
  background-color: lighten($db, 5);
  border-radius: 2px;
  box-shadow: 0 5px 5px rgba(0, 0, 0, 0.02), inset 0 0px 0px 1px rgba(0, 0, 0, 0.07);
  transform: translateZ(0);
}

.item:hover {
  circle,
  image {transform: scale(1)}
}

button {
  width: 12px;
  height: 12px;
  border: none;
  appearance: none;
  box-shadow: 0 0 0 1px rgba(0,0,0,.5);
  border-radius: 1px;

  &.dark {background-color: $db;}
  &.light {background-color: $lb;}
}

.options {
  position: absolute;
  top: 1rem;
  right: 1rem;
  button {margin-left: .5rem}
}

.light {
  background-color: $lb;
  color: $lc;
  p {color: rgba($lc, .5);}
  .item {background: $dc;}
  .svg-text {fill: rgba(#000, .1);}
}

/*
 * Noel Delgado | @pixelia_me
 */

var items = []
  , point = document.querySelector('svg').createSVGPoint();

function getCoordinates(e, svg) {
  point.x = e.clientX;
  point.y = e.clientY;
  return point.matrixTransform(svg.getScreenCTM().inverse());
}

function changeColor(e) {
  document.body.className = e.currentTarget.className;
}

function Item(config) {
  Object.keys(config).forEach(function (item) {
    this[item] = config[item];
  }, this);
  this.el.addEventListener('mousemove', this.mouseMoveHandler.bind(this));
  this.el.addEventListener('touchmove', this.touchMoveHandler.bind(this));
}

Item.prototype = {
  update: function update(c) {
    this.clip.setAttribute('cx', c.x);
    this.clip.setAttribute('cy', c.y);
  },
  mouseMoveHandler: function mouseMoveHandler(e) {
    this.update(getCoordinates(e, this.svg));
  },
  touchMoveHandler: function touchMoveHandler(e) {
    e.preventDefault();
    var touch = e.targetTouches[0];
    if (touch) return this.update(getCoordinates(touch, this.svg));
  }
};

[].slice.call(document.querySelectorAll('.item'), 0).forEach(function (item, index) {
  items.push(new Item({
    el: item,
    svg: item.querySelector('svg'),
    clip: document.querySelector('#clip-'+index+' circle'),
  }));
});

[].slice.call(document.querySelectorAll('button'), 0).forEach(function (button) {
  button.addEventListener('click', changeColor);
});