.piano-roll margin-top: 32px; background: #1e2a36; border-radius: 20px; padding: 16px;
// DOM elements const fileInput = document.getElementById('fileInput'); const dropZone = document.getElementById('dropZone'); const selectBtn = document.getElementById('selectFileBtn'); const controlsSection = document.getElementById('controlsSection'); const notationCanvas = document.getElementById('notationCanvas'); const pianoCanvas = document.getElementById('pianoCanvas'); const midiStatus = document.getElementById('midiStatus'); const trackInfoSpan = document.getElementById('trackInfo'); const downloadBtn = document.getElementById('downloadPdfBtn'); const resetBtn = document.getElementById('resetBtn');
let events = []; for (let note of filtered) let durationTicks = note.duration; let durFraction = durationTicks / ticksPerQuarter; let vexDuration = '4'; // default quarter if (durFraction >= 1.8) vexDuration = '2'; else if (durFraction >= 0.9) vexDuration = '4'; else if (durFraction >= 0.45) vexDuration = '8'; else vexDuration = '16'; events.push( keys: [pitchToNoteName(note.pitch)], duration: vexDuration, startTick: note.startTick ); // sort by startTick for proper rendering events.sort((a,b)=> a.startTick - b.startTick); return events, ticksPerMeasure, maxTickLimit ; midi to thirty dollar website
#notationCanvas background: #fffdf8; box-shadow: 0 2px 8px rgba(0,0,0,0.03); width: 100%; height: auto; border-radius: 16px;
<script> // ---------- GLOBALS ---------- let currentMidiData = null; // raw array buffer let parsedMidi = null; // MidiFile object let currentTrackEvents = []; // simplified notes for piano roll + notation let activeTrackIndex = 0; // we'll merge first non-empty track For real PDF, use 'Save as PDF' from browser print dialog
// Event Listeners selectBtn.addEventListener('click', () => fileInput.click()); fileInput.addEventListener('change', (e) => if (e.target.files.length) loadMidiFile(e.target.files[0]); ); dropZone.addEventListener('dragover', (e) => e.preventDefault(); dropZone.style.borderColor = '#2c7da0'; ); dropZone.addEventListener('dragleave', () => dropZone.style.borderColor = '#bdd3e8'; ); dropZone.addEventListener('drop', (e) => ); resetBtn.addEventListener('click', () => fileInput.value = ''; controlsSection.style.display = 'none'; setStatus("Ready — upload a MIDI file"); currentMidiData = null; parsedMidi = null; ); downloadBtn.addEventListener('click', exportAsPDF);
// Helper: show status function setStatus(msg, isError = false) midiStatus.innerHTML = msg; midiStatus.style.background = isError ? '#ffe6e5' : '#e9f0f5'; midiStatus.style.color = isError ? '#b00020' : '#1f5e7a'; For real PDF
// PDF export using html2canvas: capture notation canvas + piano roll + status async function exportAsPDF() if (!parsedMidi) setStatus("No MIDI loaded", true); return; setStatus("Generating PDF preview..."); const elementToCapture = document.querySelector('.sheet-preview'); if (!elementToCapture) return; try const canvas = await html2canvas(elementToCapture, scale: 2, backgroundColor: '#ffffff' ); const imgData = canvas.toDataURL('image/png'); const link = document.createElement('a'); const timestamp = new Date().toISOString().slice(0,19).replace(/:/g, '-'); link.download = `midi_sheet_$timestamp.png`; link.href = imgData; link.click(); setStatus("PDF (PNG) saved! For real PDF, use 'Save as PDF' from browser print dialog. But high-res PNG ready."); // Alternative: open print dialog for true PDF (we give user note) setTimeout(() => if(confirm("Want to open print dialog to generate real PDF? (Recommended for vector quality)")) window.print(); , 200); catch(e) setStatus("Export failed: " + e.message, true);
