code: public void setAngleRange(final double RANGE) {
          double tmpAngleRange = Helper.clamp(0.0, 360.0, RANGE);
          if (null == angleRange) {
              _angleRange = tmpAngleRange;
              setAngleStep(tmpAngleRange / getRange());
              if (isAutoScale()) { calcAutoScale(); }
              fireUpdateEvent(RECALC_EVENT);
          } else {
              angleRange.set(tmpAngleRange);
          }
      }
docs: Defines the angle range in degree that will be used to draw the scale
  of the radial gauge. The given range will be clamped in the range of
  0 - 360 degrees. The range will start at the startAngle and will be
  drawn in the direction dependent on the scaleDirection.
  
  @param RANGE