code: @Pure
  	public double toGlobalY(double y) {
  		final double adjustedY = y - this.translationY.get();
  		return this.invertY.get() ? -adjustedY : adjustedY;
  	}
docs: Change the coordinate system of {@code y} from the
  "centered" graphical coordinate system to the global document coordinate system.
  
  @param y the y graphical coordinate to convert.
  @return the x coordinate in the global coordinate system.