code: @Override protected void handleEvents(final String EVENT_TYPE) {
          super.handleEvents(EVENT_TYPE);
          if ("RECALC".equals(EVENT_TYPE)) {
              angleRange = Helper.clamp(90.0, 180.0, gauge.getAngleRange());
              minValue   = gauge.getMinValue();
              range      = gauge.getRange();
              angleStep  = angleRange / range;
              redraw();
          }
      }
docs: ******************** Methods *******************************************