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,
  Formatter,
  Stave,
  StaveNote,
  Accidental,
  Beam,
  Dot,
  StaveTie
} = 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: ['d/4'],
    duration: '16'
  }),
  new StaveNote({
    keys: ['d/4'],
    duration: 'q'
  }),
  new StaveNote({
    keys: ['d/4'],
    duration: 'q'
  }),
];

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

const ties = [
  new StaveTie({
    first_note: notes[4],
    last_note: notes[5],
    first_indices: [0],
    last_indices: [0],
  }),
  new StaveTie({
    first_note: notes[5],
    last_note: notes[6],
    first_indices: [0],
    last_indices: [0],
  }),
];

ties.forEach((t) => {
  t.setContext(context).draw();
});

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