cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

Looking for quick-add? Try the external resource search, it's quicker and gives you access to the most recent version of thousands of libraries. ☝️

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Looking for quick-add? Try the external resource search, it's quicker and gives you access to the most recent version of thousands of libraries. ☝️

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              %input{:type => "checkbox", :id => "btn"}
%label{:for => "btn", :class => "btn"}
  %span.unchecked Play!
  %span.checked Pause!

.surface
  .compressor
    -16.times do |i|
      .row
        -16.times do |j|
          .point
            
          
!
            
              // these two have to match the number of elements in the DOM
$nx: 16; // number of elements along x axis
$ny: 16; // number of elements along y axis

$nux: 4; // number of units along the x axis
$nuy: 4; // number of units along the y axis

$d: .25em; // dot diam
$u: 5em; // unit size
$p: 5.6; // max height param
$t: 16s; // rotation animation duration
$of: .75; // opacity factor

$dpux: floor($nx/$nux); // density of dots per unit along x axis
$dpuy: floor($ny/$nuy); // density of dots per unit along y axis

$minx: -1*floor($nux/2); // minimum value along x axis
$miny: -1*floor($nuy/2); // minimum value along y axis

@function asin($val, $e: pi()/7200) {
  /*
   * $val: the value for which we compute the arc sine;
   * $e: tolerated error; lower = better precision
   * 
   * the function returns the arc sine of $val
   * 
   * Examples: 
   * asin(.5) returns 29.97584deg (using default tolerated error)
   * asin(0, pi()/180) returns 0deg
   */
  
  $sum: 0; // the "infinite" sum we compute
  $sign: 1; // sign of angle
  $flag: 0; // 0 if angle in absolute value < 45deg, 1 otherwise
  $i: 0; // current index
  $c: 1;
  $j: 2*$i + 1;
  
  @if abs($val) > sin(45deg) {
    $flag: 1;
    $sign: $val/abs($val);
    $val: sqrt(1 - pow($val, 2));
  }
  
  $term: $c*pow($val, $j)/$j;
  
  @while abs($term) > $e {
    $sum: $sum + $term;
    
    $i: $i + 1;
    $c: $c*(2*$i - 1)/(2*$i);
    $j: 2*$i + 1;
    
    $term: $c*pow($val, $j)/$j;
  }
  
  $result: $sign*($flag*pi()/2 + pow(-1, $flag)*$sum);
  
  @return $result/pi()*180deg;
}

@function atan($val, $e: pi()/7200) {
  /*
   * $val: the value for which we compute the arc tangent
   * $e: tolerated error; lower = better precision
   * 
   * the function returns the arc tangent of $val
   * 
   * Examples: 
   * atan(1) returns ~45deg (using default tolerated error)
   * atan(0, pi()/180) returns 0deg
   */
  
  $val: $val/sqrt(1 + pow($val, 2));
  
  @return asin($val, $e);
}
html, body { height: 100%; }

body {
  overflow: hidden;
  margin: 0;
  perspective-origin: 50% 0;
  perspective: 32em;
  background: black;
}

.surface, .surface *, .surface :before, .surface :after {
  position: absolute;
  top: 50%; right: 50%;
  transform-style: preserve-3d;
}

.row {
  @for $i from 0 to $nx {
    &:nth-child(#{$i + 1}) {
      $x: $minx + $i/$dpux;
      transform: translateZ($x*$u);
      @for $j from 0 to $ny {
        .point:nth-child(#{$j + 1}) {
          $y: $miny + $j/$dpuy;
          $z: $p*$x*pow(e(), -1*(pow($x, 2) + pow($y, 2)));
          transform: translate($y*$u, $z*$u);
          &:before, &:after {
            background: hsl($z*360/$p, 100%, 50%);
          }
          &:before {
            @if $i > 0 {
              $x0: $minx + ($i - 1)/$dpux;
              $z0: $p*$x0*pow(e(), -1*(pow($x0, 2) + pow($y, 2)));
              $alpha: atan($dpux*($z - $z0));
              transform: rotateY(-90deg) 
                         skewY($alpha) rotateX(90deg);
              background: linear-gradient(90deg, 
                  hsl($z0*360/$p, 100%, 50%), 
                  hsl($z*360/$p, 100%, 50%));
            }
            @else { display: none; }
          }
          &:after {
            @if $j >0 {
              $y0: $miny + ($j - 1)/$dpuy;
              $z0: $p*$x*pow(e(), -1*(pow($x, 2) + pow($y0, 2)));
              $alpha: atan($dpuy*($z - $z0));
              transform: skewY($alpha) rotateX(90deg);
              background: linear-gradient(90deg, 
                  hsl($z0*360/$p, 100%, 50%), 
                  hsl($z*360/$p, 100%, 50%));
            }
            @else {
              display: none;
            }
          }
        }
      }
    }
  }
}

.point {
  &:before, &:after {
    margin: -$d/2 0;
    height: $d;
    transform-origin: 100% 50%;
    opacity: $of;
    content: '';
  }
  &:before { width: $u/$dpux; }
  &:after { width: $u/$dpuy; }
}

@keyframes rot { to { transform: rotateY(360deg); } }

@keyframes compress { to { transform: scaleY(-1); } }

/* "play animation" button styles */
input[type=checkbox] { display: none }
.btn {
  overflow: hidden;
  position: absolute;
  z-index: 10;
  top: 1em; left: 50%;
  border-radius: .5em;
  box-shadow: 0 1px 0 black, 0 -1px 0 #96d1f8;
  margin: 0 -3.25em;
  opacity: .45;
  background: #65a9d7 linear-gradient(#3e779d, #65a9d7);
  color: white;
  font: 700 italic 1em/2.6 Georgia, serif;
  text-shadow: 0 1px 0 black;
  cursor: pointer;
  transition: .7s;
  &:hover { opacity: 1; }
}
.btn, .btn span { width: 6.5em; height: 2.6em; }
.btn span {
  position: absolute;
  text-align: center;
  transition: .5s;
}
.unchecked { top: 0; }
.checked { top: 100%; }
input[type=checkbox]:checked ~ .btn .unchecked { top: -100%; }
input[type=checkbox]:checked ~ .btn .checked { top: 0; }


/* in case anyone is wondering why I haven't used 
 * `animation-play-state`: Chrome Canary on Win 7 fucks up */
input[type=checkbox]:checked ~ .surface {
  animation: rot $t linear infinite;
}
input[type=checkbox]:checked ~ .surface .compressor {
  animation: compress $t*random(100)/100 ease-in-out 
             infinite alternate;
}
            
          
!
999px
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.
Loading ..................

Console