title: Default Reference Point for Display Object in Corona
body: <p>I am trying to understand those reference points in Corona. It is said that the default reference point is the center of the object, however the x  position of center of the textObject isn't at 100 but 150 when I run this code:</p>
  
  <pre><code>  local textObject = display.newText(  "Hello World!", 100, 100, nil , 20 )
  </code></pre>
  
  <p>I displayed those position with touch event on the screen and printing the x and y position of touched places:</p>
  
  <pre><code>  local function onScreenTouch(event)
        print("x: "..event.x.."  y: "..event.y);
    end
    Runtime:addEventListener("tap", onScreenTouch)
  </code></pre>