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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>Music Track Visualizer</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background: #1e1e1e;
color: #d4d4d4;
overflow: hidden;
}
#controls {
padding: 15px;
background: #2d2d2d;
border-bottom: 1px solid #3e3e3e;
display: flex;
gap: 15px;
align-items: center;
flex-wrap: wrap;
}
button, input[type="file"] {
padding: 8px 16px;
background: #0e639c;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 14px;
}
button:hover {
background: #1177bb;
}
input[type="file"] {
padding: 6px 12px;
}
.zoom-controls {
display: flex;
gap: 8px;
align-items: center;
}
.zoom-controls button {
padding: 6px 12px;
min-width: 40px;
}
.zoom-label {
font-size: 14px;
color: #9cdcfe;
}
#canvas-container {
position: relative;
width: 100%;
height: calc(100vh - 70px);
overflow: auto;
background: #1e1e1e;
}
#timeline-canvas {
display: block;
cursor: grab;
}
#timeline-canvas:active {
cursor: grabbing;
}
#info {
position: fixed;
bottom: 10px;
right: 10px;
background: rgba(45, 45, 45, 0.95);
padding: 10px 15px;
border-radius: 4px;
font-size: 12px;
border: 1px solid #3e3e3e;
max-width: 300px;
}
#info div {
margin: 3px 0;
}
.info-label {
color: #9cdcfe;
font-weight: bold;
}
#filename {
color: #4ec9b0;
margin-left: 10px;
font-weight: bold;
}
</style>
</head>
<body>
<div id="controls">
<input type="file" id="file-input" accept=".track" />
<span id="filename"></span>
<div class="zoom-controls">
<span class="zoom-label">Zoom:</span>
<button id="zoom-out">−</button>
<button id="zoom-reset">Reset</button>
<button id="zoom-in">+</button>
</div>
<div class="zoom-controls">
<span class="zoom-label">Vertical:</span>
<button id="v-zoom-out">−</button>
<button id="v-zoom-reset">Reset</button>
<button id="v-zoom-in">+</button>
</div>
</div>
<div id="canvas-container">
<canvas id="timeline-canvas"></canvas>
</div>
<div id="info">
<div><span class="info-label">Pan:</span> Click and drag</div>
<div><span class="info-label">Zoom:</span> Mouse wheel</div>
<div><span class="info-label">Scroll:</span> Shift + wheel</div>
<div><span class="info-label">Patterns:</span> <span id="pattern-count">0</span></div>
<div><span class="info-label">Duration:</span> <span id="duration">0s</span></div>
</div>
<script>
const canvas = document.getElementById('timeline-canvas');
const ctx = canvas.getContext('2d');
const container = document.getElementById('canvas-container');
const fileInput = document.getElementById('file-input');
const filenameSpan = document.getElementById('filename');
// State
let trackData = null;
let zoomLevel = 1.0;
let verticalZoom = 1.0;
let offsetX = 0;
let offsetY = 0;
let isDragging = false;
let lastMouseX = 0;
let lastMouseY = 0;
// Constants
const PIXELS_PER_SECOND = 80; // Base scale
const PATTERN_HEIGHT = 40; // Base height
const PATTERN_SPACING = 5;
const TIMELINE_TOP = 80;
const LEFT_MARGIN = 120;
const TICK_HEIGHT = 8;
// Pattern colors (deterministic based on name hash)
function getPatternColor(patternName) {
let hash = 0;
for (let i = 0; i < patternName.length; i++) {
hash = patternName.charCodeAt(i) + ((hash << 5) - hash);
}
const hue = Math.abs(hash % 360);
return `hsl(${hue}, 70%, 55%)`;
}
// Parse .track file
function parseTrackFile(content) {
const lines = content.split('\n');
const patterns = {};
const score = [];
let currentPattern = null;
let inScore = false;
for (let line of lines) {
line = line.trim();
// Skip comments and empty lines
if (line.startsWith('#') || line.length === 0) continue;
// Pattern definition
if (line.startsWith('PATTERN ')) {
currentPattern = line.substring(8).trim();
patterns[currentPattern] = [];
inScore = false;
continue;
}
// Score section
if (line === 'SCORE') {
inScore = true;
currentPattern = null;
continue;
}
// Pattern events (beat, sample, volume, pan)
if (currentPattern && !inScore) {
const parts = line.split(',').map(s => s.trim());
if (parts.length >= 2) {
patterns[currentPattern].push({
beat: parseFloat(parts[0]),
sample: parts[1],
volume: parts.length > 2 ? parseFloat(parts[2]) : 1.0,
pan: parts.length > 3 ? parseFloat(parts[3]) : 0.0
});
}
}
// Score entries (time, pattern_name)
if (inScore) {
const parts = line.split(',').map(s => s.trim());
if (parts.length >= 2) {
score.push({
time: parseFloat(parts[0]),
pattern: parts[1]
});
}
}
}
return { patterns, score };
}
// Calculate pattern duration in beats
function getPatternDurationBeats(pattern) {
if (pattern.length === 0) return 4.0; // Default 4 beats
return Math.max(...pattern.map(e => e.beat)) + 1.0;
}
// Convert beats to seconds (120 BPM = 2 beats per second)
function beatsToSeconds(beats) {
const beatsPerSecond = 2; // 120 BPM
return beats / beatsPerSecond;
}
// Draw timeline
function drawTimeline() {
if (!trackData) return;
const { patterns, score } = trackData;
// Find max time for canvas sizing
const maxTime = score.length > 0
? Math.max(...score.map(s => s.time + beatsToSeconds(getPatternDurationBeats(patterns[s.pattern] || []))))
: 60;
// Update canvas size
canvas.width = LEFT_MARGIN + (maxTime * PIXELS_PER_SECOND * zoomLevel) + 100;
canvas.height = TIMELINE_TOP + (score.length * (PATTERN_HEIGHT * verticalZoom + PATTERN_SPACING)) + 100;
// Clear canvas
ctx.fillStyle = '#1e1e1e';
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Draw time ruler
drawTimeRuler(maxTime);
// Draw beat background
drawBeatBackground(maxTime);
// Group score entries by time for stacking
const stackedPatterns = [];
for (const entry of score) {
const startTime = entry.time;
const durationBeats = getPatternDurationBeats(patterns[entry.pattern] || []);
const duration = beatsToSeconds(durationBeats);
const endTime = startTime + duration;
// Find stack level (avoid overlaps)
let stackLevel = 0;
while (true) {
const conflicts = stackedPatterns.filter(p =>
p.stackLevel === stackLevel &&
!(endTime <= p.startTime || startTime >= p.endTime)
);
if (conflicts.length === 0) break;
stackLevel++;
}
stackedPatterns.push({
patternName: entry.pattern,
startTime,
endTime,
duration,
stackLevel,
events: patterns[entry.pattern] || []
});
}
// Draw pattern boxes
for (const item of stackedPatterns) {
drawPatternBox(item);
}
// Update info
document.getElementById('pattern-count').textContent = Object.keys(patterns).length;
document.getElementById('duration').textContent = `${maxTime.toFixed(1)}s`;
}
// Draw time ruler
function drawTimeRuler(maxTime) {
ctx.strokeStyle = '#3e3e3e';
ctx.fillStyle = '#d4d4d4';
ctx.font = '12px monospace';
ctx.textAlign = 'center';
const rulerY = TIMELINE_TOP - 20;
// Draw ruler line
ctx.beginPath();
ctx.moveTo(LEFT_MARGIN, rulerY);
ctx.lineTo(LEFT_MARGIN + maxTime * PIXELS_PER_SECOND * zoomLevel, rulerY);
ctx.stroke();
// Draw time markers
const interval = zoomLevel < 0.5 ? 10 : zoomLevel < 1.0 ? 5 : 2;
for (let t = 0; t <= maxTime; t += interval) {
const x = LEFT_MARGIN + t * PIXELS_PER_SECOND * zoomLevel;
ctx.beginPath();
ctx.moveTo(x, rulerY - 5);
ctx.lineTo(x, rulerY + 5);
ctx.stroke();
ctx.fillText(`${t}s`, x, rulerY - 10);
}
}
// Draw beat background (alternating colored rectangles)
function drawBeatBackground(maxTime) {
const beatsPerSecond = 2; // 120 BPM = 2 beats per second
const beatWidth = (PIXELS_PER_SECOND * zoomLevel) / beatsPerSecond;
const totalBeats = Math.ceil(maxTime * beatsPerSecond);
// Alternating colors for beats
const color1 = '#2a2a2a'; // Slightly lighter than background
const color2 = '#1e1e1e'; // Background color
for (let beat = 0; beat < totalBeats; beat++) {
const x = LEFT_MARGIN + beat * beatWidth;
const isEvenBeat = beat % 2 === 0;
ctx.fillStyle = isEvenBeat ? color1 : color2;
// Draw from TIMELINE_TOP to avoid covering the time ruler
ctx.fillRect(x, TIMELINE_TOP, beatWidth, canvas.height - TIMELINE_TOP);
}
}
// Draw pattern box
function drawPatternBox(item) {
const x = LEFT_MARGIN + item.startTime * PIXELS_PER_SECOND * zoomLevel;
const y = TIMELINE_TOP + item.stackLevel * (PATTERN_HEIGHT * verticalZoom + PATTERN_SPACING);
const width = item.duration * PIXELS_PER_SECOND * zoomLevel;
const height = PATTERN_HEIGHT * verticalZoom;
const color = getPatternColor(item.patternName);
// Draw box
ctx.fillStyle = color + '33'; // Semi-transparent
ctx.fillRect(x, y, width, height);
// Draw border
ctx.strokeStyle = color;
ctx.lineWidth = 2;
ctx.strokeRect(x, y, width, height);
// Draw beat grid lines
ctx.strokeStyle = '#ffffff33'; // Semi-transparent white
ctx.lineWidth = 1;
const beatsPerSecond = 2; // 120 BPM = 2 beats per second
const beatWidth = (PIXELS_PER_SECOND * zoomLevel) / beatsPerSecond;
const numBeats = Math.ceil(item.duration * beatsPerSecond);
for (let beat = 1; beat < numBeats; beat++) {
const beatX = x + beat * beatWidth;
ctx.beginPath();
ctx.moveTo(beatX, y);
ctx.lineTo(beatX, y + height);
ctx.stroke();
// Beat number label (small)
if (verticalZoom > 0.8) {
ctx.fillStyle = '#ffffff55';
ctx.font = `${Math.min(9, 8 * verticalZoom)}px monospace`;
ctx.textAlign = 'center';
ctx.fillText(`${beat}`, beatX, y + 12);
}
}
// Draw pattern name
ctx.fillStyle = '#ffffff';
ctx.font = `bold ${Math.min(14, 12 * verticalZoom)}px sans-serif`;
ctx.textAlign = 'left';
ctx.fillText(item.patternName, x + 5, y + height / 2 - 5);
// Draw time label
ctx.font = `${Math.min(11, 10 * verticalZoom)}px monospace`;
ctx.fillStyle = '#9cdcfe';
ctx.fillText(`${item.startTime.toFixed(1)}s`, x + 5, y + height / 2 + 10);
// Draw sample ticks
ctx.strokeStyle = '#ffffff';
ctx.lineWidth = 2;
for (const event of item.events) {
const tickX = x + event.beat * (PIXELS_PER_SECOND * zoomLevel) / beatsPerSecond;
const tickY = y + height - TICK_HEIGHT * verticalZoom;
// Vertical tick mark
ctx.beginPath();
ctx.moveTo(tickX, tickY);
ctx.lineTo(tickX, y + height - 2);
ctx.stroke();
// Volume indicator (height of tick varies with volume)
const volumeHeight = TICK_HEIGHT * verticalZoom * event.volume;
ctx.fillStyle = color;
ctx.fillRect(tickX - 1, tickY, 3, volumeHeight);
}
}
// Load file
fileInput.addEventListener('change', (e) => {
const file = e.target.files[0];
if (!file) return;
filenameSpan.textContent = file.name;
const reader = new FileReader();
reader.onload = (event) => {
try {
trackData = parseTrackFile(event.target.result);
zoomLevel = 1.0;
verticalZoom = 1.0;
offsetX = 0;
offsetY = 0;
drawTimeline();
} catch (err) {
alert('Error parsing track file: ' + err.message);
console.error(err);
}
};
reader.readAsText(file);
});
// Zoom controls
document.getElementById('zoom-in').addEventListener('click', () => {
zoomLevel = Math.min(zoomLevel * 1.2, 10);
drawTimeline();
});
document.getElementById('zoom-out').addEventListener('click', () => {
zoomLevel = Math.max(zoomLevel / 1.2, 0.1);
drawTimeline();
});
document.getElementById('zoom-reset').addEventListener('click', () => {
zoomLevel = 1.0;
drawTimeline();
});
document.getElementById('v-zoom-in').addEventListener('click', () => {
verticalZoom = Math.min(verticalZoom * 1.2, 5);
drawTimeline();
});
document.getElementById('v-zoom-out').addEventListener('click', () => {
verticalZoom = Math.max(verticalZoom / 1.2, 0.5);
drawTimeline();
});
document.getElementById('v-zoom-reset').addEventListener('click', () => {
verticalZoom = 1.0;
drawTimeline();
});
// Mouse wheel zoom/scroll
container.addEventListener('wheel', (e) => {
if (!trackData) return;
if (e.shiftKey) {
// Horizontal scroll (use deltaX when Shift is pressed)
e.preventDefault();
container.scrollLeft += e.deltaX || e.deltaY;
} else {
// Horizontal zoom
e.preventDefault();
const delta = e.deltaY < 0 ? 1.1 : 0.9;
zoomLevel = Math.max(0.1, Math.min(10, zoomLevel * delta));
drawTimeline();
}
}, { passive: false });
// Panning
canvas.addEventListener('mousedown', (e) => {
isDragging = true;
lastMouseX = e.clientX;
lastMouseY = e.clientY;
});
window.addEventListener('mousemove', (e) => {
if (!isDragging) return;
const dx = e.clientX - lastMouseX;
const dy = e.clientY - lastMouseY;
container.scrollLeft -= dx;
container.scrollTop -= dy;
lastMouseX = e.clientX;
lastMouseY = e.clientY;
});
window.addEventListener('mouseup', () => {
isDragging = false;
});
// Initial draw
drawTimeline();
</script>
</body>
</html>
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