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index.html
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<html>
<head>
<script>
const oneBeatNotes = ['n', 'q']
const oneBeatRests = ['eE', 'Ee', 'Q']
const oneBeatTriplet = ['T']
const oneBeatTripletWithRests = ['Ó', 'Õ']
const barLine = '\''
const FourBeatRest = 'QQQQ'
const restMeasure = FourBeatRest + barLine
const oneBeatAll = Array.prototype.concat(oneBeatNotes, oneBeatRests)
const tripletAll = Array.prototype.concat(oneBeatTriplet, oneBeatTripletWithRests)
function getRandomInt(max) {
return Math.floor(Math.random() * max);
}
function getTripletProb() {
return document.getElementById('probOfTriplet').value
}
function generateString(numberOfBeats, notesArray, tripletArray) {
let result = ''
const probOfTriplet = getTripletProb()
const includeTriplets = probOfTriplet && tripletArray && tripletArray.length
for (let i = 0; i < numberOfBeats; i++) {
if (includeTriplets && shouldInsertTriplet(probOfTriplet)) {
const index = getRandomInt(tripletArray.length)
result += tripletArray[index]
} else {
const index = getRandomInt(notesArray.length)
result += notesArray[index]
}
// if this beat is the end of a measure
if ((i + 1) % 4 === 0) {
result += barLine
if (shouldInsertRestMeasure() === '1') {
result += restMeasure
i += 4
} else if ((i+1) % 8 === 0 && shouldInsertRestMeasure() === '2') {
result += restMeasure + restMeasure
i += 8
}
}
// arrange rhythm in 4-bar lines
if ((i + 1) % 16 === 0) {
result += '<br>'
}
}
return result
}
function basicOneBeat(numberOfBeats) {
return generateString(numberOfBeats, oneBeatNotes)
}
function basicOneBeatWithRest(numberOfBeats) {
return generateString(numberOfBeats, oneBeatAll)
}
function shouldInsertTriplet(probability) {
return (probability > Math.random())
}
function shouldInsertRestMeasure() {
return document.querySelector('input[name="restMeasure"]:checked').value
}
function isBeatOneOrTwo(beatNumber) {
return (beatNumber % 3 > 0 && beatNumber % 4 > 0)
}
function basicWithTriplets(numberOfBeats) {
return generateString(numberOfBeats, oneBeatAll, oneBeatTriplet)
}
function basicWithAllTriplets(numberOfBeats) {
return generateString(numberOfBeats, oneBeatAll, tripletAll)
}
function setString(display) {
document.getElementById('generatedString').innerHTML = display
}
function setBeatString(option) {
const numberOfBeats = parseInt(document.getElementById('numberOfBeats').value)
switch (option) {
case 1: setString(basicOneBeat(numberOfBeats)); break;
case 2: setString(basicOneBeatWithRest(numberOfBeats)); break;
case 3: setString(basicWithTriplets(numberOfBeats)); break;
case 4: setString(basicWithAllTriplets(numberOfBeats)); break;
}
}
</script>
</head>
<body>
<input id="numberOfBeats" value="4"> number of beats to generate<br>
Insert measure of rest
<input type="radio" value='0' name="restMeasure" checked>none</input>
<input type="radio" value='1' name="restMeasure">after one</input>
<input type="radio" value='2' name="restMeasure">after two</input><br>
<input id="probOfTriplet" type="number" step="0.1" min="0" max="1" value="0"> decimal between 0 and 1 to control triplet frequency (for Options 3 & 4)<br>
<button onClick="setBeatString(1)">Option 1</button>
<button onClick="setBeatString(2)">Option 2</button>
<button onClick="setBeatString(3)">Option 3</button>
<button onClick="setBeatString(4)">Option 4</button>
<!--
bar line: <span style="font-family: MusiSync; font-size: 32px">'</span><br>
<table>
<tr>
<td style="border: solid">
<p>one beat</p>
eighth notes: <span style="font-family: MusiSync; font-size: 32px">ee</span><br>
eighth rests: <span style="font-family: MusiSync; font-size: 32px">EE</span><br>
linked eighth notes: <span style="font-family: MusiSync; font-size: 32px">n</span><br>
quarter note: <span style="font-family: MusiSync; font-size: 32px">q</span><br>
quarter rest: <span style="font-family: MusiSync; font-size: 32px">Q</span><br>
</td>
<td style="border: solid">
<p>triplets</p>
eighth triplet: <span style="font-family: MusiSync; font-size: 32px">T</span><br>
eighth triplet: <span style="font-family: MusiSync; font-size: 32px">¤ ¤</span><br>
eighth triplet: <span style="font-family: MusiSync; font-size: 32px">Ñ Ñ</span><br>
eighth triplet: <span style="font-family: MusiSync; font-size: 32px">Ò Ò</span><br>
eighth triplet: <span style="font-family: MusiSync; font-size: 32px">Ò Ó</span><br>
eighth triplet: <span style="font-family: MusiSync; font-size: 32px">Ô Ô</span><br>
eighth triplet: <span style="font-family: MusiSync; font-size: 32px">Õ Õ</span><br>
</td>
</tr>
</table>
-->
<div id="generatedString" style="font-family: MusiSync; font-size: 64px"></div>
</body>
</html>