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demo.html
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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Butterchurn Demo</title>
<meta name="description" content="Butterchurn Demo Example">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script type="text/javascript" src="./node_modules/butterchurn/lib/butterchurn.js"></script>
<script type="text/javascript" src="./node_modules/butterchurn-presets/lib/butterchurnPresetsNonMinimal.min.js"></script>
<script type="text/javascript">
function initButterchurn() {
var butt = butterchurn.default;
var presets = butterchurnPresetsNonMinimal.getPresets();
var canvas = document.getElementById('canvas');
var visualizer = null;
var presetCycleLength = 15000; // milliseconds
var presetKeys = Object.keys(presets);
var presetIndex = Math.floor(Math.random() * presetKeys.length);
function startRenderer() {
requestAnimationFrame(() => startRenderer());
visualizer.render();
}
function nextPreset(blendTime = 5.7) {
if (true /*random*/) {
presetIndex = Math.floor(Math.random() * presetKeys.length);
} else {
presetIndex = (presetIndex + 1) % presetKeys.length;
}
visualizer.loadPreset(presets[presetKeys[presetIndex]], blendTime);
}
var playBtn = document.getElementById('play');
playBtn.onclick = () => {
playBtn.className += " hidden";
canvas.height = window.innerHeight;
canvas.width = window.innerWidth;
var audioContext = new AudioContext();
visualizer = butt.createVisualizer(audioContext, canvas, {
width: window.innerWidth,
height: window.innerHeight,
pixelRatio: window.devicePixelRatio || 1,
textureRatio: 1,
});
nextPreset(0);
cycleInterval = setInterval(() => nextPreset(2.7), presetCycleLength);
navigator.getUserMedia({ audio: true }, (stream) => {
var sourceNode = audioContext.createMediaStreamSource(stream);
audioContext.resume();
var gainNode = audioContext.createGain();
gainNode.gain.value = 1.25;
sourceNode.connect(gainNode);
visualizer.connectAudio(gainNode);
startRenderer();
}, (err) => {
console.log('Error getting audio stream from getUserMedia');
});
};
}
</script>
<style>
html, body {
height: 100%;
}
body {
margin: 0;
min-height: 100%;
display: flex;
align-items: center;
justify-content: center;
}
#play {
position: absolute;
border: 1px solid gray;
padding: 50px;
font-size: 3em;
font-family: monospace;
cursor: pointer;
color: gray;
}
#play:hover {
border: 2px solid green;
color: green;
}
.hidden {
opacity: 0;
}
#play:hover.hidden {
opacity: 1;
}
</style>
</head>
<body onload="initButterchurn();">
<div id="play">START</div>
<canvas id='canvas' width='800' height='600'></canvas>
</body>
</html>