bar3D-music.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Bar 3D - ECHARTS-GL</title>
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<meta name="apple-mobile-web-app-capable" content="yes"> <!-- Fullscreen Landscape on iOS -->
<link rel="stylesheet" href="./common.css">
</head>
<body>
<div id="main"></div>
<script src="../node_modules/echarts/dist/echarts.js"></script>
<script src="../dist/echarts-gl.js"></script>
<script src="lib/jquery.min.js"></script>
<script src="js/commonUI.js"></script>
<script>
var UPDATE_DURATION = 100;
var chart = echarts.init(document.getElementById('main'));
window.AudioContext = window.AudioContext || window.webkitAudioContext;
var audioContext = new AudioContext();
var oReq = new XMLHttpRequest();
oReq.open('GET', 'asset/roll-it-up.mp3', true);
oReq.responseType = 'arraybuffer';
oReq.onload = function(e) {
audioContext.decodeAudioData(oReq.response, initVisualizer);
};
oReq.send();
function initVisualizer(audioBuffer) {
inited = true;
var source = audioContext.createBufferSource();
source.buffer = audioBuffer;
// Must invoked right after click event
if (source.noteOn) {
source.noteOn(0);
}
else {
source.start(0);
}
var analyzer = audioContext.createAnalyser();
var gainNode = audioContext.createGain();
analyzer.fftSize = 4096;
gainNode.gain.value = 1;
source.connect(gainNode);
gainNode.connect(analyzer);
analyzer.connect(audioContext.destination);
var frequencyBinCount = analyzer.frequencyBinCount;
var dataArray = new Uint8Array(frequencyBinCount);
var item = [];
var size = 50;
var beta = 0;
function update() {
analyzer.getByteFrequencyData(dataArray);
var data = new Float64Array(size * size * 3);
var off = 0;
for (var i = 0; i < size * size; i++) {
var x = i % size;
var y = Math.floor(i / size);
var dx = x - size / 2;
var dy = y - size / 2;
var angle = Math.atan2(dy, dx);
if (angle < 0) {
angle = Math.PI * 2 + angle;
}
var dist = Math.sqrt(dx * dx + dy * dy);
var idx = Math.min(
frequencyBinCount - 1, Math.round(angle / Math.PI / 2 * 60 + dist * 60) + 100
);
var val = Math.pow(dataArray[idx] / 100, 3);
data[off++] = x;
data[off++] = y;
data[off++] = Math.max(val, 0.1);
}
console.time('update');
chart.setOption({
grid3D: {
viewControl: {
beta: beta,
alpha: Math.sin(beta / 10 + 40) * (beta % 10 + 5) / 15 * 30 + 30,
distance: Math.cos(beta / 50 + 20) * (beta % 10 + 5) / 15 * 50 + 80,
animationDurationUpdate: UPDATE_DURATION,
animationEasingUpdate: 'linear'
}
},
series: [{
dimensions: ['x', 'y', 'z'],
data: data
}]
});
beta += 2;
console.timeEnd('update');
setTimeout(update, UPDATE_DURATION);
};
update();
}
chart.setOption({
tooltip: {},
visualMap: {
show: false,
min: 0.1,
max: 4,
inRange: {
color: ['#010103', '#2f490c', '#b0b70f', '#fdff44', '#fff']
}
},
xAxis3D: {
type: 'value'
},
yAxis3D: {
type: 'value'
},
zAxis3D: {
type: 'value',
min: -6,
max: 6
},
grid3D: {
show: false,
environment: '#000',
viewControl: {
distance: 100
},
postEffect: {
enable: true,
FXAA: {
enable: true
}
},
light: {
main: {
shadow: true,
intensity: 10,
quality: 'high'
},
ambientCubemap: {
texture: 'asset/canyon.hdr',
exposure: 0,
diffuseIntensity: 0.2
}
}
},
series: [{
type: 'bar3D',
silent: true,
shading: 'lambert',
data: [],
barSize: 1,
lineStyle: {
width: 4
},
// animation: false,
animationDurationUpdate: UPDATE_DURATION
}]
});
window.addEventListener('resize', function () {
chart.resize();
});
</script>
</body>
</html>