VexFlow Sandbox

Experiment with VexFlow

by ronyeh

HTML

<script src="https://unpkg.com/[email protected]/build/cjs/vexflow-debug.js"></script>
<div id="output"></div>

JavaScript

const { Renderer, Stave, Accidental, StaveNote, Beam, Formatter, Dot } = Vex.Flow;

// Create an SVG renderer and attach it to the DIV element named "boo".
const div = document.getElementById('output');
const renderer = new Renderer(div, Renderer.Backends.SVG);

// Configure the rendering context.
renderer.resize(500, 500);
const context = renderer.getContext();

// Create a stave of width 400 at position 10, 40 on the canvas.
const stave = new Stave(10, 40, 400);

// Add a clef and time signature.
stave.addClef('treble').addTimeSignature('4/4');

// Connect it to the rendering context and draw!
stave.setContext(context).draw();

const notes = [
  dotted(new StaveNote({ keys: ['e##/5'], duration: '8d' }).addModifier(new Accidental('##'))),
  new StaveNote({ keys: ['b/4'], duration: '16' }).addModifier(new Accidental('b')),
  new StaveNote({ keys: ['c/4'], duration: '8' }),
  new StaveNote({ keys: ['d/4'], duration: '16' }),
  new StaveNote({ keys: ['e/4'], duration: '16' }).addModifier(new Accidental('b')),
  new StaveNote({ keys: ['d/4'], duration: '16' }),
  new StaveNote({ keys: ['e/4'], duration: '16' }).addModifier(new Accidental('#')),
  new StaveNote({ keys: ['g/4'], duration: '32' }),
  new StaveNote({ keys: ['a/4'], duration: '32' }),
  new StaveNote({ keys: ['g/4'], duration: '16' }),
  new StaveNote({ keys: ['d/4'], duration: 'q' }),
];

const beams = Beam.generateBeams(notes);
Formatter.FormatAndDraw(context, stave, notes);
beams.forEach((b) => {
  b.setContext(context).draw();
});

// A helper function to add a dot to a note.
function dotted(note) {
  Dot.buildAndAttach([note]);
  return note;
}