title: Calculating X Y movement based on rotation angle?
body: <p>Say I have an object in 2D space that can rotate and then should move according to its rotation angle.</p>
  
  <p>For example:</p>
  
  <ul>
  <li><p>If angle is 0(pointing upwards), then <code>on_timer</code> it should move 1 by Y and 0 by X. </p></li>
  <li><p>If angle is 45, then it should move 1 by Y and 1 by X. </p></li>
  <li><p>If pointing 90 degrees, then 0 by Y and 1 by X.</p></li>
  <li><p>If pointing 135 degrees, then -1 by Y and +1 by X, etc.</p></li>
  </ul>
  
  <p>Do you know any functions for calculating this?</p>