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,
  StaveNote,
  Accidental,
  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: ['eb/5'],
    duration: '16'
  }).addModifier(new Accidental('b')),

  dotted(new StaveNote({
    keys: ['eb/4', 'd/5'],
    duration: 'h'
  }), 0 /* add dot to note at index==0 */),

  dotted(new StaveNote({
      keys: ['c/5', 'eb/5', 'g#/5'],
      duration: 'q'
    })
    .addModifier(new Accidental('b'), 1)
    .addModifier(new Accidental('#'), 2)),
];

Formatter.FormatAndDraw(context, stave, notes);


function dotted(staveNote, noteIndex = -1) {
  if (noteIndex < 0) {
    Dot.buildAndAttach([staveNote], {
      all: true
    });
  } else {
    Dot.buildAndAttach([staveNote], {
      index: noteIndex
    });
  }
  return staveNote;
}