public void move_anchor_point_from_gravity (Gravity gravity)
Warning: move_anchor_point_from_gravity is deprecated since 1.12.
Sets an anchor point on the actor based on the given gravity, adjusting the actor postion so that its relative position within its parent remains unchanged.
Since version 1.0 the anchor point will be stored as a gravity so that if the actor changes size then the anchor point will move. For example, if you set the anchor point to SOUTH_EAST and later double the size of the actor, the anchor point will move to the bottom right.