Web worker draw loop (for canvas animations)

worker-draw-loop.js

// Main thread
var test = document.getElementById('test');
drawWorker = work(require('./draw-worker.js'));
drawWorker.addEventListener('message', function(e) {
  if (e.data.msg === 'tick') {
    sketchUpdateFn();
  }
});
drawWorker.postMessage({draw: true, rate: appFrameRate});
drawWorker.onerror = function(e) {
  console.log('Error with web worker on ' + 'Line #' + e.lineno +' - ' + e.message + ' in ' + e.filename);
  alternativeDrawFn();
};

// Worker thread / draw-worker.js
module.exports = function (self) {
    var interval;
    self.addEventListener('message', function(e) {
        if (e.data.draw) {
            interval = setInterval(function() {
                self.postMessage({msg: 'tick'});
            }, 1000 / e.data.rate);
        } else {
            clearInterval(interval);
            self.close();
        }
    }, false);
};