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@ivyywang
Last active September 21, 2016 20:00
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Music Visualizer
license: MIT
height: 1500
border: no

Music Visualizer

// https://d3js.org Version 4.2.3. Copyright 2016 Mike Bostock.
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<!-- D3.js -->
<script src="d3.v4.min.js" charset="utf-8"></script>
</head>
<body>
<audio src="Viva_la_Vida.ogg" autoplay="autoplay"></audio>
<script language="javascript" type="text/javascript">
(function() {
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
var audioElement = document.querySelector('audio')
var audioSrc = audioCtx.createMediaElementSource(audioElement);
var analyser = audioCtx.createAnalyser();
// bind our analyser to the media element source.
audioSrc.connect(analyser);
audioSrc.connect(audioCtx.destination);
// var frequencyData = new Uint8Array(analyser.frequencyBinCount);
var frequencyData = new Uint8Array(200);
var svgWidth = 1050,
svgHeight = 1500;
var svg = d3.select('body').append('svg')
.attr('height', svgHeight)
.attr('width', svgWidth)
//SVG filter for the gooey effect
//Code taken from http://tympanus.net/codrops/2015/03/10/creative-gooey-effects/
var defs = svg.append("defs");
var filter = defs.append("filter").attr("id","gooeyCodeFilter");
filter.append("feGaussianBlur")
.attr("in","SourceGraphic")
.attr("stdDeviation","10")
//to fix safari: http://stackoverflow.com/questions/24295043/svg-gaussian-blur-in-safari-unexpectedly-lightens-image
.attr("color-interpolation-filters","sRGB")
.attr("result","blur");
filter.append("feColorMatrix")
.attr("in","blur")
.attr("mode","matrix")
.attr("values","1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 18 -7")
.attr("result","gooey");
var circleWrapper = svg.append("g")
.attr("class", "circleWrapper")
.style("filter", "url(#gooeyCodeFilter)");
// continuously loop and update chart with frequency data.
function renderChart() {
requestAnimationFrame(renderChart);
// copy frequency data to frequencyData array.
analyser.getByteFrequencyData(frequencyData);
// console.log(frequencyData);
// scale things to fit
var radiusScale = d3.scaleLinear()
.domain([0, d3.max(frequencyData)])
.range([0, svgHeight/2 -10]);
var hueScale = d3.scaleLinear()
.domain([0, d3.max(frequencyData)])
.range([0, 360]);
// var colors = ["#F95B34", "#EE3E64", "#F36283", "#FF9C34", "#EBDE52", "#B7D84B", "#44ACCF"];
var xScale = d3.scaleLinear()
.domain([0, frequencyData.length])
.range([0, svgWidth])
var yScale = d3.scaleLinear()
.domain([0, d3.max(frequencyData)])
.range([0, svgHeight])
// update d3 chart with new data
var circles = circleWrapper.selectAll('circle')
.data(frequencyData);
circles.exit().remove();
circles.enter().append('circle')
.merge(circles)
.attr('r', function(d) { return radiusScale(d) })
.attr('cx', function(d,i){ return xScale(i)} )
.attr('cy', function(d) { return yScale(d) })
.style('fill', 'none')
.style('stroke-width', 4)
.style('stroke-opacity', 0.4)
.style('stroke', function(d) { return d3.hsl(hueScale(d), 1, 0.5)})
}
// run the loop
renderChart();
// // just for blocks viewer size
// d3.select(self.frameElement)
// .style('height', svgHeight+'px')
// .style('width', svgWidth+'px')
}() );
</script>
</body>
</html>
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