Tone.js/examples/animationSync.html

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ANIMATION SYNC</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<link rel="icon" type="image/png" sizes="174x174" href="./style/favicon.png">
<script src="../build/Tone.js"></script>
<script src="./scripts/jquery.min.js"></script>
<script src="./scripts/draggabilly.js"></script>
<script src="./scripts/StartAudioContext.js"></script>
<script src="./scripts/Interface.js"></script>
<script src="https://tonejs.github.io/Logo/build/Logo.js"></script>
<link rel="stylesheet" type="text/css" href="./style/examples.css">
<script>
// jshint ignore: start
</script>
<style type="text/css">
#Notes{
width: 100%;
height: 20px;
margin-top: 3px;
position: relative;
}
.Note {
width: 20%;
height: 100%;
position: relative;
float: left;
background-color: black;
opacity: 0;
}
</style>
</head>
<body>
<div id="Content">
<div id="Title">Synchronizing Visuals</div>
<div id="Explanation">
Audio scheduling and rendering visuals should always be kept separate. Instead of triggering visuals from within a scheduled event callback, schedule a 'deferred' callback using Tone.Draw which will be invoked on an animation frame at the exact moment of the scheduled event.
<br><br>
For more information see <a href="https://github.com/Tonejs/Tone.js/wiki/Performance">this wiki article</a>.
</div>
<div id="Notes">
<div id="C4" class="Note"></div>
<div id="E4" class="Note"></div>
<div id="G4" class="Note"></div>
<div id="B4" class="Note"></div>
<div id="D5" class="Note"></div>
</div>
</div>
<script id="ToneCode">
var piano = new Tone.Synth({
"oscillator" : {
"type" : "fmsine4",
"modulationType" : "square"
}
}).toMaster();
var loop = new Tone.Pattern(function(time, note){
piano.triggerAttackRelease(note, "16n", time);
// Draw.schedule takes a callback and a time to invoke the callback
Tone.Draw.schedule(function(){
//the callback synced to the animation frame at the given time
$("#"+note).css("opacity", 1).animate({"opacity" : 0}, 300)
}, time);
}, ["C4", "E4", "G4", "B4", "D5"]).start(0);
loop.interval = "16n";
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// GUI //
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Tone.Transport.lookAhead = 0.5
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Interface.Button({
key : 32,
type : "toggle",
text : "Start",
activeText : "Stop",
start : function(){
Tone.Transport.start("+0.1");
},
end : function(){
Tone.Transport.stop();
}
});
</script>
</body>
</html>