mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-10 05:54:20 +00:00
130 lines
No EOL
3.2 KiB
HTML
130 lines
No EOL
3.2 KiB
HTML
<html>
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<head>
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<title>STEP SEQUENCER</title>
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<script src="http://code.jquery.com/jquery-2.1.0.min.js"></script>
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<script type="text/javascript" src="../Tone.js"></script>
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<link rel="stylesheet" type="text/css" href="exampleStyle.css">
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</head>
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<body>
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<div>16 Step Sequencer. Each column is a 16th note and each row is a different note.</div>
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<br>
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<button>start</button>
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<br><br>
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<div id="checkboxes"></div>
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<div id="output"></div>
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<div id="loading">loading...</div>
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<script type="text/javascript">
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//which beat in the 16 beats
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var stepNumber = 0;
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//the number of loaded players
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var loadedCount = 0;
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//2d array of checkboxes
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var checkboxes = [];
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//array of radio buttons
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var radios = [];
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//all of the audio players
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var players = [
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new Tone.Player("./audio/casio/A1.mp3", playerLoaded),
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new Tone.Player("./audio/casio/Cs2.mp3", playerLoaded),
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new Tone.Player("./audio/casio/E2.mp3", playerLoaded),
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new Tone.Player("./audio/casio/Fs2.mp3", playerLoaded)
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];
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//player onload callback
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function playerLoaded(player){
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//able to be retriggered before the file is done playing
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player.retrigger = true;
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player.toMaster();
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loadedCount++;
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if (loadedCount === players.length){
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$("#loading").remove();
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}
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}
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//make the checkboxes
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//1 row for each player
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//16 beats in each row
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function makeCheckboxes(){
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for (var row = 0; row < players.length; row++){
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checkboxes[row] = [];
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for (var beat = 0; beat < 16; beat++){
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var checkbox = $("<input type='checkbox'>").appendTo("#checkboxes");
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checkboxes[row].push(checkbox);
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//randomly set some as checked initially
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if (Math.random() < 0.25){
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checkbox.prop("checked", true);
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}
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}
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$("#checkboxes").append("<br>")
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}
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}
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//make the radio buttons to show which beat we're on
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function makeRadios(){
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for (var beat = 0; beat < 16; beat++){
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var radio = $("<input type='radio' name='step'>").appendTo("#checkboxes");
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radios.push(radio);
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}
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$("#checkboxes").append("<br>");
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}
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//called when the start button is clicked
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function startTransport(){
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if (Tone.Transport.state === "started"){
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Tone.Transport.stop();
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$("button").text("start");
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$("#output").text("");
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} else {
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stepNumber = 0;
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$("button").text("stop");
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Tone.Transport.setInterval(onStep, "16n");
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Tone.Transport.start();
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}
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}
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//called every sixteenth note
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function onStep(time){
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//set the right radio
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selectRadio(stepNumber);
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//for each of the rows
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for (var row = 0; row < players.length; row++){
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//check each of the checkbox values
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var box = checkboxes[row][stepNumber];
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if (box.prop("checked")){
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players[row].start(time);
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}
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}
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stepNumber++;
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stepNumber = stepNumber % 16;
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}
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//show the current beat on the radio buttons
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function selectRadio(stepNumber){
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//unselect the previous one
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var prev = stepNumber - 1;
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if (prev === -1){
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prev = 15;
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}
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radios[prev].prop("checked", false);
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//select the current one
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radios[stepNumber].prop("checked", true);
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}
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//initialization
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$(function(){
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//the start button
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$("button").click(startTransport);
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//the interface
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makeRadios();
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makeCheckboxes();
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Tone.Transport.setBpm(120);
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});
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</script>
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</body>
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</html> |