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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://unpkg.com/@webcomponents/webcomponentsjs@^2/webcomponents-bundle.js" > < / script >
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< script src = "../build/Tone.js" > < / script >
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< script src = "./js/tonejs-ui.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 >
< tone-explanation label = "Synchronizing Visuals" >
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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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< / tone-explanation >
< tone-content >
< 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 >
< / tone-content >
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< tone-drawer >
< tone-synth collapsed > < / tone-synth >
< / tone-drawer >
< / tone-example >
< script type = "text/javascript" >
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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
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const noteElement = document.querySelector("#"+note);
noteElement.classList.add("active");
setTimeout(() => {
noteElement.classList.remove("active");
}, 100);
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}, time);
}, ["C4", "E4", "G4", "B4", "D5"]).start(0);
loop.interval = "16n";
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Tone.Transport.lookAhead = 0.5;
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//connect the UI with the components
document.querySelector("tone-play-toggle").bind(Tone.Transport);
document.querySelector("tone-synth").bind(piano);
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< / script >
< / body >
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< / html >
