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<!DOCTYPE html>
< html >
< head >
< meta charset = "utf-8" >
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< title > Analyser< / title >
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< meta name = "viewport" content = "width=device-width, initial-scale=1, maximum-scale=1" >
< link rel = "icon" type = "image/png" sizes = "174x174" href = "./favicon.png" >
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< script src = "https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/2.4.3/webcomponents-bundle.js" > < / script >
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< link href = "https://fonts.googleapis.com/css?family=Material+Icons&display=block" rel = "stylesheet" / >
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< script src = "../build/Tone.js" > < / script >
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< script src = "./js/tone-ui.js" > < / script >
< script src = "./js/components.js" > < / script >
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< / head >
< body >
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< style type = "text/css" >
#Notes{
width: 100%;
height: 20px;
position: relative;
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margin-bottom: 10px;
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}
.Note {
width: 20%;
height: 100%;
position: relative;
float: left;
background-color: black;
opacity: 0;
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transition: opacity 0.5s;
}
.Note.active {
opacity: 1;
transition-duration: 0.1s;
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}
< / style >
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< tone-example label = "Synchronizing Visuals" >
< div slot = "explanation" >
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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.
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< br > < br >
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For more information see < a href = "https://github.com/Tonejs/Tone.js/wiki/Performance" > this wiki article< / a > .
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< / div >
< div id = "content" >
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< 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 >
< tone-play-toggle > < / tone-play-toggle >
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< / div >
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< / tone-example >
< script type = "text/javascript" >
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const synth = new Tone.Synth({
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oscillator: {
type: "fmsine4",
modulationType: "square"
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}
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}).toDestination();
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const loop = new Tone.Pattern(((time, note) => {
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synth.triggerAttackRelease(note, "16n", time);
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// Draw.schedule takes a callback and a time to invoke the callback
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Tone.Draw.schedule(() => {
// the callback synced to the animation frame at the given time
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const noteElement = document.querySelector("#"+note);
noteElement.classList.add("active");
setTimeout(() => {
noteElement.classList.remove("active");
}, 100);
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}, time);
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}), ["C4", "E4", "G4", "B4", "D5"]).start(0);
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loop.interval = "16n";
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drawer().add({
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tone: synth,
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title: "Piano",
});
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// connect the UI with the components
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document.querySelector("tone-play-toggle").addEventListener("start", () => Tone.Transport.start());
document.querySelector("tone-play-toggle").addEventListener("stop", () => Tone.Transport.stop());
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< / script >
< / body >
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< / html >
