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 CSS

These stylesheets will be added in this order and before the code you write in the CSS editor. You can also add another Pen here, and it will pull the CSS from it. Try typing "font" or "ribbon" below.

Quick-add: + add another resource

Add External JavaScript

These scripts will run in this order and before the code in the JavaScript editor. You can also link to another Pen here, and it will run the JavaScript from it. Also try typing the name of any popular library.

Quick-add: + add another resource

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.

              <section id="links">
  <a target="_blank" href="https://codepen.io/Rumyra/pen/mOWKdL">View over Https</a>
  <a target="_blank" href="https://codepen.io/Rumyra/pen/pEMGEP">Read Blog Post</a>

<div id="screen">
              html {background:#efefef; font-family:"Lato", "Lucida Grande","Lucida Sans Unicode", Tahoma, Sans-Serif; letter-spacing:-0.2px;}
body {margin:0px; padding:0px; overflow:hidden;}
#links {
  display:flex; padding:5px;
  a {
    display:block; padding:5px 15px;
    border: 3px solid #343436; border-radius: 3px;
    text-align:center; text-decoration:none; color:#fff;
    &:hover {background-color:#4d4d50;}
#screen, svg {width: 100vw; height: 100vh; padding:0px; margin:0px;}
#screen {
  position: relative;
  background: black;

              var audioApi = new window.AudioContext;

// variables
var audioBuffer,
    frequencyData = new Uint8Array(256);

// create an audio API analyser node and connect to source
function createAnalyserNode(audioSource) {
  analyserNode = audioApi.createAnalyser();
  analyserNode.fftSize = 512;

// getUserMedia success callback -> pipe audio stream into audio API
function gotStream(stream) {
    // Create an audio input from the stream.
    var audioSource = audioApi.createMediaStreamSource(stream);


// pipe in analysing to getUserMedia
navigator.mediaDevices.getUserMedia({ audio: true, video: false })

// enter and exit
var svg = d3.select('svg');
var rects = svg.selectAll('rect');

//<line x1="20" y1="100" x2="100" y2="20" stroke-width="2" stroke="black"/>

var z = Math.round(Math.floor(window.innerWidth/16));

function translate(i) {
  return "translate("+(i%16)*z+","+Math.round(Math.floor(i/16))*z+")";
// 0(0,0) 1(16,0) 2(32,0)
// 16(0,16) 17(16,16) 18(32,16)
// 32(0,32) 33(16,32) 34(32,32)

function drawRects() {


  rects = rects.data(frequencyData);
    .attr("transform", function(d, i) {return translate(i);})
    .attr("width", z)
    .attr("height", z);

    .style("fill", function(d,i) { 
      return "hsla("+(i%15)*24+",50%,"+Math.round(d/5+10)+"%,1)";
Loading ..................