static JComponent jVerticalGreenBar(final LiveValue<? extends Number> lv, fO... _) {
  final JComponent c = dynamicallyPaintedComponent(voidfunc(Graphics2D g, int w, int h) {
    float value = toFloat(lv!);
    float max = toFloat(optParam(_, 'max, (Number) 1f));
    int height = iround(doubleRatio(value, max)*h);
    main.fillRect(g, 0, 0, w, h-height, Color.black);
    main.fillRect(g, 0, h-height, w, height, Color.green);
  });
  bindLiveValueListenerToComponent(c, lv, r { c.repaint() });
  ret c;
}