mirror of
https://github.com/Tonejs/Tone.js
synced 2024-12-26 03:23:11 +00:00
143 lines
3.7 KiB
HTML
143 lines
3.7 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Phasing</title>
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<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
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<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>
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<script src="./js/components.js"></script>
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</head>
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<body>
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<style type="text/css">
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#loop {
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margin-bottom: 10px;
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display: flex;
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}
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#loop .bar {
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flex-grow: 1;
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width: 40%;
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height: 20px;
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margin: 10px;
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background-color: #ececec;
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border-radius: 4px;
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overflow: hidden;
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position: relative;
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}
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#loop .bar .fill {
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height: 100%;
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width: 50%;
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background-color:#7F33ED;
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position: absolute;
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left: 50%;
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transform: translate(-50%, 0);
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}
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</style>
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<tone-example label="Piano Phase">
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<div slot="explanation">
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By slightly slowing down the playbackRate of the Tone.Sequence in the right channel,
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the two identical melodies phase against each other in interesting ways.
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<br><br>
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Composition by Steve Reich. Inspiration from Alexander Chen.
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</div>
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<div id="content">
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<div id="loop">
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<div class="bar">
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<div class="fill" id="left"></div>
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</div>
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<div class="bar">
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<div class="fill" id="right"></div>
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</div>
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</div>
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<tone-play-toggle></tone-play-toggle>
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</div>
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</tone-example>
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<script type="text/javascript">
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// set the bpm and time signature first
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Tone.Transport.timeSignature = [6, 4];
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Tone.Transport.bpm.value = 180;
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// L/R channel merging
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const merge = new Tone.Merge();
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// a little reverb
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const reverb = new Tone.Reverb({
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wet: 0.3
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});
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merge.chain(reverb, Tone.Destination);
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// left and right synthesizers
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const synthL = new Tone.Synth({
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oscillator: {
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type: "custom",
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partials: [2, 1, 2, 2],
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},
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envelope: {
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attack: 0.005,
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decay: 0.3,
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sustain: 0.2,
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release: 1,
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},
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portamento: 0.01,
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volume: -20
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}).connect(merge, 0, 0);
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const synthR = new Tone.Synth({
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oscillator: {
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type: "custom",
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partials: [2, 1, 2, 2],
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},
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envelope: {
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attack: 0.005,
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decay: 0.3,
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sustain: 0.2,
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release: 1,
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},
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portamento: 0.01,
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volume: -20
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}).connect(merge, 0, 1);
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// the two Tone.Sequences
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const partL = new Tone.Sequence(((time, note) => {
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synthL.triggerAttackRelease(note, "8n", time);
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}), ["E4", "F#4", "B4", "C#5", "D5", "F#4", "E4", "C#5", "B4", "F#4", "D5", "C#5"], "8n").start();
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const partR = new Tone.Sequence(((time, note) => {
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synthR.triggerAttackRelease(note, "8n", time);
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}), ["E4", "F#4", "B4", "C#5", "D5", "F#4", "E4", "C#5", "B4", "F#4", "D5", "C#5"], "8n").start("2m");
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// set the playback rate of the right part to be slightly slower
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partR.playbackRate = 0.985;
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// bind the interface
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document.querySelector("tone-play-toggle").addEventListener("start", () => Tone.Transport.start());
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document.querySelector("tone-play-toggle").addEventListener("stop", () => Tone.Transport.stop());
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// update the width of the fill bars to reflect the left and right progress
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function progressToWidth(progress) {
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progress = Math.cos(progress * Math.PI * 2 + Math.PI);
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progress = (progress + 1) / 2;
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return `${progress * 100}%`;
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}
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function loop() {
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requestAnimationFrame(loop);
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// make it go out and back for each loop
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// @ts-ignore
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document.querySelector("#left").style.width = progressToWidth(partL.progress);
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// @ts-ignore
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document.querySelector("#right").style.width = progressToWidth(partR.progress);
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}
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loop();
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</script>
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</body>
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</html>
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