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alex
2026-07-26 15:47:29 +05:30
commit a8ae3d0e80
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Carnatic Piano</title>
<link rel="stylesheet" href="css/styles.css" />
</head>
<body>
<h1>Carnatic Piano</h1>
<div class="controls">
<label for="ragamSelect">Ragam:</label>
<select id="ragamSelect">
<option value="Bhairavi">Bhairavi</option>
<option value="Kalyani">Kalyani</option>
<option value="Mayamalavagowla" selected>Mayamalavagowla</option>
<option value="Mohanam">Mohanam</option>
<option value="Shankarabharanam">Shankarabharanam</option>
</select>
<label for="startingNote">Starting Sa:</label>
<select id="startingNote">
<option value="G#">G#</option>
<option value="A" selected>A</option>
<option value="A#">A#</option>
<option value="B">B</option>
<option value="C">C</option>
<option value="C#">C#</option>
</select>
<label for="svaraNames">Svara Names:</label>
<select id="svaraNames">
<option value="short">S, R, G, M, P, D, N</option>
<option value="full">Sa, Ri, Ga, Ma, Pa, Dha, Ni</option>
<option value="malayalam">സ, രി, ഗ, മ, പ, ധ, നി</option>
</select>
<label for="svaraStyle">Svara Display:</label>
<select id="svaraStyle">
<option value="plain" selected>Plain swaras</option>
<option value="variant">Numbered svara variants</option>
</select>
</div>
<div class="piano" id="piano"></div>
<script src="js/script.js"></script>
</body>
</html>
script.js
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// Initialize audio context lazily to avoid autoplay restrictions
let audioCtx;
const NOTE_NAMES = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"];
const SVARA_NAMES = {
full: ["Sa", "Ri", "Ga", "Ma", "Pa", "Dha", "Ni"],
short: ["S", "R", "G", "M", "P", "D", "N"],
malayalam: ["സ", "രി", "ഗ", "മ", "പ", "ധ", "നി"]
};
const semitoneMap = {
C: 0,
"C#": 1,
D: 2,
"D#": 3,
E: 4,
F: 5,
"F#": 6,
G: 7,
"G#": 8,
A: 9,
"A#": 10,
B: 11,
Ab: 8,
Bb: 10
};
const ragams = {
Bhair: {
intervals: [0, 2, 3, 6, 7, 9, 11],
namesFull: ["Sa", "Ri", "Ga", "Ma", "Pa", "Dha", "Ni"],
namesShort: ["S", "R", "G", "M", "P", "D", "N"],
namesMalayalam: ["സ", "രി", "ഗ", "മ", "പ", "ധ", "നി"],
variantNumbers: ["", "2", "2", "1", "", "2", "2"]
},
Kalyani: {
intervals: [0, 2, 4, 6, 7, 9, 11],
namesFull: ["Sa", "Ri", "Ga", "Ma", "Pa", "Dha", "Ni"],
namesShort: ["S", "R", "G", "M", "P", "D", "N"],
namesMalayalam: ["സ", "രി", "ഗ", "മ", "പ", "ധ", "നി"],
variantNumbers: ["", "2", "3", "2", "", "2", "3"]
},
Mayamalavagowla: {
intervals: [0, 1, 4, 5, 7, 8, 11],
namesFull: ["Sa", "Ri", "Ga", "Ma", "Pa", "Dha", "Ni"],
namesShort: ["S", "R", "G", "M", "P", "D", "N"],
namesMalayalam: ["സ", "രി", "ഗ", "മ", "പ", "ധ", "നി"],
variantNumbers: ["", "1", "3", "1", "", "1", "3"]
},
Mohanam: {
intervals: [0, 2, 4, 7, 9],
namesFull: ["Sa", "Ri", "Ga", "Pa", "Dha"],
namesShort: ["S", "R", "G", "P", "D"],
namesMalayalam: ["സ", "രി", "ഗ", "പ", "ധ"],
variantNumbers: ["", "2", "3", "", "2"]
},
Shankarabharanam: {
intervals: [0, 2, 4, 5, 7, 9, 11],
namesFull: ["Sa", "Ri", "Ga", "Ma", "Pa", "Dha", "Ni"],
namesShort: ["S", "R", "G", "M", "P", "D", "N"],
namesMalayalam: ["സ", "രി", "ഗ", "മ", "പ", "ധ", "നി"],
variantNumbers: ["", "2", "3", "1", "", "2", "3"]
}
};
const ROOT_OCTAVE = 4;
const SOUND_OCTAVE_OFFSET = -12;
const svaraNamesSelect = document.getElementById("svaraNames");
const svaraStyleSelect = document.getElementById("svaraStyle");
const startingNoteSelect = document.getElementById("startingNote");
const ragamSelect = document.getElementById("ragamSelect");
const pianoElement = document.getElementById("piano");
function normalizeSemitone(value) {
return ((value % 12) + 12) % 12;
}
function absFrequency(absSemitone) {
const a4Abs = 4 * 12 + semitoneMap.A; // fixed A4 reference for real pitch
const soundAbsSemitone = absSemitone + SOUND_OCTAVE_OFFSET;
return 440 * Math.pow(2, (soundAbsSemitone - a4Abs) / 12);
}
function noteNameToAbs(noteName) {
return ROOT_OCTAVE * 12 + semitoneMap[noteName];
}
function getSwaraLabel(absSemitone, startAbs, svaraNames, ragam, svaraStyle) {
const diff = normalizeSemitone(absSemitone - startAbs);
const intervalIndex = ragam.intervals.indexOf(diff);
if (intervalIndex === -1) {
return "";
}
const baseLabel = svaraNames[intervalIndex];
if (svaraStyle === "variant" && ragam.variantNumbers) {
const variant = ragam.variantNumbers[intervalIndex];
if (variant) {
return `${baseLabel}<sup>${variant}</sup>`;
}
}
return baseLabel;
}
function buildKeyHtml(absSemitone, startAbs, svaraNames, ragam, svaraStyle) {
const noteName = NOTE_NAMES[normalizeSemitone(absSemitone)];
const isSharp = noteName.includes("#");
const label = getSwaraLabel(absSemitone, startAbs, svaraNames, ragam, svaraStyle);
const classes = ["key", isSharp ? "black" : "white"];
if (absSemitone < startAbs) {
classes.push("lower");
} else if (absSemitone > startAbs + 11) {
classes.push("upper");
}
if (normalizeSemitone(absSemitone - startAbs) === 0) {
classes.push("sa-root");
}
if (label) {
classes.push("has-label");
}
const content = label ? `<span class="key-label">${label}</span>` : "";
return `<div class="${classes.join(" ")}" data-abs="${absSemitone}">${content}</div>`;
}
function renderKeyboard() {
const startNote = startingNoteSelect.value;
const svaraNames = SVARA_NAMES[svaraNamesSelect.value] || SVARA_NAMES.full;
const svaraStyle = svaraStyleSelect.value;
const ragam = ragams[ragamSelect.value];
const startAbs = noteNameToAbs(startNote);
const lowerPaAbs = startAbs - 5;
const upperPaAbs = startAbs + 19;
let html = "";
for (let abs = lowerPaAbs; abs <= upperPaAbs; abs += 1) {
html += buildKeyHtml(abs, startAbs, svaraNames, ragam, svaraStyle);
}
pianoElement.innerHTML = html;
attachKeyListeners();
}
function attachKeyListeners() {
const keys = pianoElement.querySelectorAll(".key");
keys.forEach((key) => {
key.addEventListener("click", () => {
playNote(parseInt(key.dataset.abs, 10));
});
});
}
function ensureAudioContext() {
if (!audioCtx) {
audioCtx = new (window.AudioContext || window.webkitAudioContext)();
}
return audioCtx;
}
async function playNote(absSemitone) {
const ctx = ensureAudioContext();
if (ctx.state === "suspended") {
await ctx.resume();
}
const freq = absFrequency(absSemitone);
const oscillator = ctx.createOscillator();
const gainNode = ctx.createGain();
oscillator.type = "sine";
oscillator.frequency.setValueAtTime(freq, ctx.currentTime);
oscillator.connect(gainNode);
gainNode.connect(ctx.destination);
gainNode.gain.setValueAtTime(0.2, ctx.currentTime);
oscillator.start();
oscillator.stop(ctx.currentTime + 0.5);
}
renderKeyboard();
svaraNamesSelect.addEventListener("change", renderKeyboard);
svaraStyleSelect.addEventListener("change", renderKeyboard);
startingNoteSelect.addEventListener("change", renderKeyboard);
ragamSelect.addEventListener("change", renderKeyboard);
styles.css
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body {
font-family: sans-serif;
text-align: center;
background: #2a2a2a;
padding: 20px;
}
h1 {
color: #fff;
}
.controls {
margin-bottom: 30px;
}
.controls label {
color: #fff;
margin-right: 10px;
font-size: 16px;
}
.controls select {
padding: 8px 12px;
font-size: 14px;
border-radius: 5px;
border: none;
background: #fff;
color: #333;
cursor: pointer;
}
.piano {
display: flex;
justify-content: center;
align-items: flex-end;
margin-top: 50px;
background: #111;
padding: 20px;
border-radius: 10px;
box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
}
.key {
display: flex;
align-items: flex-end;
justify-content: center;
font-size: 14px;
cursor: pointer;
border: 1px solid #222;
border-radius: 5px;
user-select: none;
transition: all 0.05s;
position: relative;
min-height: 1em;
}
/* Sharp keys may show Carnatic swara labels if they correspond to the chosen scale */
.key.sharp.sa-root {
color: #fff;
font-size: 14px;
}
.key.has-label .key-label {
position: relative;
display: inline-flex;
}
.key.has-label .key-label sub {
font-size: 0.65em;
display: inline-block;
vertical-align: text-bottom;
line-height: 1;
position: relative;
top: 0.18em;
}
.key.lower.has-label .key-label::after,
.key.upper.has-label .key-label::after {
position: absolute;
content: '•';
font-size: 12px;
color: currentColor;
pointer-events: none;
left: 50%;
transform: translateX(-50%);
}
.key.black.has-label .key-label::after {
color: #777;
}
.key.lower.has-label .key-label::after {
top: 100%;
margin-top: -2px;
}
.key.upper.has-label .key-label::after {
bottom: 100%;
margin-bottom: -5px;
}
/* White keys */
.key.white {
width: 60px;
height: 250px;
background: linear-gradient(135deg, #fff 0%, #f5f5f5 100%);
color: #333;
margin: 0 -1px;
padding-bottom: 15px;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4), inset 0 -1px 3px rgba(0, 0, 0, 0.1);
}
.key.white:active {
background: linear-gradient(135deg, #e0e0e0 0%, #d5d5d5 100%);
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.5), inset 0 1px 3px rgba(0, 0, 0, 0.2);
transform: translateY(2px);
}
/* Black keys */
.key.black {
width: 40px;
height: 160px;
background: linear-gradient(135deg, #222 0%, #111 100%);
color: #fff;
position: relative;
z-index: 10;
margin: 0 -20px;
padding-top: 10px;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.8), inset 0 1px 2px rgba(255, 255, 255, 0.1);
align-self: flex-start;
}
.key.black:active {
background: linear-gradient(135deg, #111 0%, #000 100%);
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.9), inset 0 1px 2px rgba(255, 255, 255, 0.05);
transform: translateY(2px);
}
.key.sa-root.white {
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4), inset 0 -1px 3px rgba(0, 0, 0, 0.1);
}
.key.sa-root.black {
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.8), inset 0 1px 2px rgba(255, 255, 255, 0.1);
}
.key.sa-root:not(.sharp) {
color: #d84315;
font-weight: 700;
}