code: public void setReturnToZero(final boolean IS_TRUE) {
          if (null == returnToZero) {
              _returnToZero = Double.compare(getMinValue(), 0.0) <= 0 ? IS_TRUE : false;
              fireUpdateEvent(REDRAW_EVENT);
          } else {
              returnToZero.set(IS_TRUE);
          }
      }
docs: Defines the behavior of the visualization where the needle/bar should
  always return to 0 after it reached the final value. This setting only makes
  sense if animated == true and the data rate is not too high.
  Set to false when using real measured live data.
  
  @param IS_TRUE