title: Position PointText in Center of Canvas
body: <p>I need this:</p>
  
  <pre><code>var text = new PointText({
      point: [50, 50],
      content: 'Text',
      fillColor: 'black',
      fontFamily: 'Courier New',
      fontWeight: 'bold',
      fontSize: 25
  });
  </code></pre>
  
  <p>to be centered (x + y) in my canvas.</p>
  
  <p>There is nothing special about the canvas.</p>