move css and js files into folders

2026-07-26 15:53:03 +05:30
parent a8ae3d0e80
commit 2cf1ceeef9
2 changed files with 343 additions and 343 deletions
@@ -0,0 +1,193 @@
+// 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);
+
+