title: Hide UI/Image partially in Unity 5
body: <p>Does Unity 5 support partial hiding of a UI/Image?</p>
  
  <p>For example, the UI/Image I have in my scene has 100 width and 100 height.<br>
  At <code>time = 0</code>, the UI/Image is hidden. When <code>time = 5</code>, the UI/Image only shows the first 50 pixels. When <code>time = 10</code>, the UI/Image is fully drawn.</p>