A Pen by Yogev Ahuvia.

CSS-Filter-Glass.markdown

CSS Filter Glass

Examine CSS filters through fluid resizable window glass. You can drag and drop an image file from your desktop onto the glass and see the filters manipulate your image live. Available filters are: grayscale, sepia, blur, brightness, contrast, invert, hue-rotate and saturate.

A Pen by Yogev Ahuvia on CodePen.

License.

index.html

<div class="wrapper">
  <hgroup>
    <h1>CSS Filter Glass</h1>
    <h3>drag an image file from your desktop onto the glass</h3>
  </hgroup>
  <div class="window">
    <div class="glass left img"></div>
    <div class="handle"></div>
    <div class="glass right filter-grayscale img"></div>
  </div>
  <ul class="filter-choice">
    <li data-filter="grayscale">
      <input type="radio" name="filter-choice-group" value="grayscale" class="filter-grayscale img" checked>
    </li>
    <li data-filter="sepia">
      <input type="radio" name="filter-choice-group" value="sepia" class="filter-sepia img">
    </li>
    <li data-filter="blur">
      <input type="radio" name="filter-choice-group" value="blur" class="filter-blur img">
    </li>
    <li data-filter="brightness">
      <input type="radio" name="filter-choice-group" value="brightness" class="filter-brightness img">
    </li>
    <li data-filter="contrast">
      <input type="radio" name="filter-choice-group" value="contrast" class="filter-contrast img">
    </li>
    <li data-filter="hue-rotate">
      <input type="radio" name="filter-choice-group" value="hue-rotate" class="filter-hue-rotate img">
    </li>
    <li data-filter="invert">
      <input type="radio" name="filter-choice-group" value="invert" class="filter-invert img">
    </li>
    <li data-filter="saturate">
      <input type="radio" name="filter-choice-group" value="saturate" class="filter-saturate img">
    </li>
    <li class="alt">
      <a href="http://www.google.com/chrome" target="_blank">
        <img src="http://kindofone.me/resources/icons/chrome-512.png" width="32" title="Chrome only" alt="Chrome only" />
      </a>
    </li>
  </ul>
</div>

script.js

var imageWindow = $('.window');
var leftGlass = $('.glass.left');
var rightGlass = $('.glass.right');
var initialWidth = leftGlass.width();

// Drag and Drop event listeners
imageWindow.on('dragover', onDragOver);
imageWindow.on('dragenter', onDragEnter);
imageWindow.on('dragleave', onDragLeave);
imageWindow.on('drop', onDrop);

// Glass handle drag behavior
$('.handle').draggable({axis: 'x',
  containment: 'parent',
  drag: function(event, ui) {
    var handleOffset = ui.position.left - initialWidth;
    
    leftGlass.width(initialWidth + handleOffset);
    rightGlass.width(initialWidth - handleOffset);
  }
});

// Filter chooser events
$('input[name="filter-choice-group"]').on('click', function() {
  // remove any previous filter-* class from right glass
  rightGlass.removeClass(function (index, css) {
    return (css.match (/\bfilter-\S+/g) || []).join(' ');
  });
  
  // add the selected filter class to the right glass
  rightGlass.addClass('filter-' + $(this).val());
});

setImage('http://kindofone.me/resources/TheOtherSideOfManhattan.jpg');

function setImage(uri) {
  $('.img').css('background-image', 'url('+uri+')');
}

// Drag And Drop event handlers
function onDragOver(evt) {
  evt.stopPropagation();
  evt.preventDefault();
  evt.originalEvent.dataTransfer.dropEffect = 'copy';
}

function onDragEnter(evt) {
  evt.stopPropagation();
  evt.preventDefault();
  $('.window').addClass('dragover');
}

function onDragLeave(evt) {
  evt.stopPropagation();
  evt.preventDefault();
  $('.window').removeClass('dragover');
}

// Thanks Eric Bidelman :)
function onDrop(evt) {
  evt.stopPropagation();
  evt.preventDefault();
  $('.window').removeClass('dragover');
  
  // Allowed file types
  var allowedFileTypes = /image.*/;
  
  // Get dropped file object
  var file = evt.originalEvent.dataTransfer.files[0];
  
  // Validate allowed type, or break
  if (!file.type.match(allowedFileTypes)) {
    return;
  }
  
  // Setup FileReader
  var reader = new FileReader();
  reader.onerror = function(evt) { 
    console.log('FileReader error: ' + e.target.error); 
  }
  reader.onload = (function(aFile) {
    return function(evt) {
      // Set dropped file as current image
      setImage(evt.target.result);
    }
  })(file);
  
  reader.readAsDataURL(file);
}

style.scss

@import "compass";
$window-width: 800px;
$window-height: $window-width * 9/16; /* keep 16:9 ratio */
$glass-width: $window-width / 2;
$handle-width: 2px;

.wrapper {
  width: 940px;
  margin: 20px auto;
  position: relative;
}

/*=== Title ===*/
hgroup {
  text-align: center;
  margin-bottom: 20px;
  
  h1 {
    font-size: 30px;
    margin-bottom: 5px;
    @include text-shadow(0px 1px 3px #999);
  }
  
  h3 {
    font-weight: 300;
  }
}

/*=== Main View ===*/
.window {
  width: $window-width;
  height: $window-height;
  position: relative;
  overflow: hidden;
  float: left;
  margin: 0 20px 20px 70px;
  @include border-radius(5px);
  @include box-shadow(0px 1px 2px 0px #999, inset 0px 1px 1px 0px white);
  
  &.dragover {
    animation: shake 0.5s infinite linear;
  }
}

.glass {
  width: $glass-width;
  height: 100%;
  position: absolute;
  
  &.left {
    left: 0px;
    background-image: none;
    background-size: $window-width;
    background-position: top left;
    @include border-top-left-radius(5px);
    @include border-bottom-left-radius(5px);
  }
  
  &.right {
    right: 0px;
    background-image: none;
    background-size: $window-width;
    background-position: top right;
    margin: -1px;
    padding: 1px;
    @include border-top-right-radius(8px); /* should be 5px, chrome overflow fix */
    @include border-bottom-right-radius(5px);
  }
}

.handle {
  width: $handle-width;
  height: 100%;
  position: absolute;
  background: gray;
  z-index: 1;
  cursor: pointer;
  left: $glass-width - ($handle-width / 2);
  
  &:after {
    content: '‹ ›';
    text-align: center;
    font-family: serif;
    font-size: 24px;
    line-height: 26px;
    display: block;
    position: absolute;
    width: 30px;
    height: 30px;
    border-radius: 100%;
    top: 50%;
    left: 50%;
    margin: -15px 0 0 -15px;
    background: #ddd;
    @include box-shadow(0px 1px 1px 0px #222, inset 0px 1px 1px 0px white);
  }
}

/*=== Filter Menu ===*/
.filter-choice {
  float: left;
  width: 50px;
  height: $window-height;
  position: relative;
  
  > li {
    width: 50px;
    height: 28px;
    margin-bottom: 10px;
    position: relative;
    @include border-radius(5px);
    
    &.alt {
      position: absolute;
      bottom: 0;
      text-align: center;
      
      img:hover {
        background: #999;
        @include border-radius(100%);
        @include box-shadow(0px 0px 1px 0px #999);
      }
    }
    
    &:hover:after {
      content: attr(data-filter);
      display: block;
      position: absolute;
      width: 100px;
      height: 100%;
      line-height: 26px;
      font-size: 12px;
      top: 0;
      left: 115%;
      @include filter(none);
    }
  
    input {
      display: block;
      width: 50px;
      height: 28px;
      cursor: pointer;
      margin: 0;
      background-size: 100%;
      background-repeat: no-repeat;
      @include appearance(none);
      @include border-radius(5px);
      @include transition(box-shadow 0.2s);
      @include box-shadow(0px 1px 2px 0px #999, inset 0px 1px 1px 0px white);
      
      &:hover {
        @include box-shadow(0px 1px 2px 1px #999, inset 0px 1px 1px 0px white);
      }
      
      &:active, &:checked {
        @include box-shadow(inset 0px 1px 3px 1px #999, 0px 1px 1px 0px white);
      }
    }
  }
}

/*=== Filter Classes ===*/
.filter-grayscale {
  @include filter(grayscale(1));
}

.filter-sepia {
  @include filter(sepia(1));
}

.filter-blur {
  @include filter(blur(5px));
}

.filter-brightness {
  @include filter(brightness(0.5));
}

.filter-contrast {
  @include filter(contrast(10));
}

.filter-hue-rotate {
  @include filter(hue-rotate(90deg));
}

.filter-invert {
  @include filter(invert(1));
}

.filter-saturate {
  @include filter(saturate(10));
}

input[type="radio"].filter-blur { /* blur filter fix for thumb */
  @include filter(blur(1px));
}

/*=== Animations ===*/
@keyframes shake {
  0% {
    @include transform(rotate(0deg));
  }
  25% {
    @include transform(rotate(2deg));
  }
  75% {
    @include transform(rotate(-2deg));
  }
  100% {
    @include transform(rotate(0deg));
  }
}

body {
  font-family: 'Open Sans', sans-serif;
  background: #ddd;
  background-image: url(http://kindofone.me/resources/gray_jean.png);
}