title: Angular Overlay withTransformOriginOn usage
body: <p>I need to animate a tooltip that uses Angular Overlay CDK, based on it's position.</p>
  <p><code>withTransformOriginOn</code> sounds like it could do the trick based on the <a href="https://beta-angular-material-io.firebaseapp.com/cdk/overlay/api" rel="nofollow noreferrer">Angular Overlay CDK documentation</a> :</p>
  <p><a href="https://i.stack.imgur.com/f7smC.png" rel="nofollow noreferrer">Angular withTransformOriginOn only documentation</a></p>
  <p>I do not understand how to use it, as Angular provides no example or description for the usage, and I can't find any example online...</p>
  <p>Has anyone used it before and could point me to some direction, or explain to me how it is supposed to work ?</p>
  <p>Thank you</p>