I am trying to make an animation for geometry where the student would drag a point to form an angle and it would display the angle size. I am working in Adobe Edge. I offseted the origin of the green dot to be at the center of the red dot. If I manually rotate in Edge, the green dot follows the arc properly. However, for draggable, I am not sure how I could make it work (of course constrain on x or y does not work). Is there a way I can constrain in rotate?