code: @Override protected void handleEvents(final String EVENT_TYPE) {
          super.handleEvents(EVENT_TYPE);
          if ("RECALC".equals(EVENT_TYPE)) {
              minValue  = gauge.getMinValue();
              maxValue  = gauge.getMaxValue();
              range     = gauge.getRange();
              sections  = gauge.getSections();
              angleStep = ANGLE_RANGE / range;
              redraw();
              rotateNeedle(gauge.getCurrentValue());
          } else if ("FINISHED".equals(EVENT_TYPE)) {
              needleTooltip.setText(String.format(locale, formatString, gauge.getValue()));
          }
      }
docs: ******************** Methods *******************************************