Anima allows us to animate any property to an absolute or relative final value. Positions can be animated to a relative one by using any of the built-in anima_relative_position_* helpers, while for any other property we can use the animate_as_relative method.

The only thing to keep in mind is that

Example 

  Anima.begin_single_shot(true) \
  .then( Anima.Node(self).anima_scale_x(1.5).anima_as_relative() ) \
  .play()

This will increase the scale:x value of +1.5, from whatever the current value was at the time the animation was created.