title: Fabricjs Add text to the center of rectangle
body: <p>I have circle and rectangles inside. I want to assign numbers and asterisk chars.
  This is how it looks now:</p>
  
  <p><a href="https://i.stack.imgur.com/Cv62f.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Cv62f.png" alt="enter image description here"></a></p>
  
  <p>As you can see, numbers located fine, but asterisks don't. They should be located under numbers. I won't copy code here, just have a look at <a href="http://jsbin.com/luzocituze/1/edit?js,console,output" rel="nofollow noreferrer">JSBIN</a>.</p>
  
  <p>Adding asterisk chars starts in <code>markAsterisk</code> function.</p>