title: Openlayers 3 interaction.draw()
body: <p>I am trying to create a user interactive circle using the example code from the openlayers example website:</p>
  
  <pre><code>var draw = new ol.interaction.Draw({
      features: featureOverlay.getFeatures(),
      type: 'Circle'
  });
  map.addInteraction(draw);
  </code></pre>
  
  <p>I always get a <code>TypeError</code> when I set, type: <code>Circle</code>, but when I set the type to <code>Point</code>, <code>LineString</code>, or <code>Polygon</code> it works just fine. I looked through the openlayers 3 API documentation and <code>Circle</code> is a valid geometric type. Does anyone here have any information of why I get the type error?</p>