Swing/ClockWithArabicOrRomanNumerals のバックアップ(No.3)

private void paintClockNumbers(Graphics2D g2, float radius, float hourMarkerLen) {
  AffineTransform at = AffineTransform.getRotateInstance(0d);
  g2.setColor(Color.WHITE);
  Font font = g2.getFont();
  FontRenderContext frc = g2.getFontRenderContext();
  if (isRomanNumerals) {
    for (String txt : romanNumerals) {
      Shape s = moveTo12o(getOutline(txt, font, frc), radius, hourMarkerLen);
      g2.fill(at.createTransformedShape(s));
      at.rotate(Math.PI / 6d);
    }
  } else {
    double ty = radius - hourMarkerLen - font.getSize2D() * .6d;
    Point2D ptSrc = new Point2D.Double(0d, -ty);
    for (int i = 0; i < 12; i++) {
      String txt = i == 0 ? "12" : Objects.toString(i);
      Rectangle r = getOutline(txt, font, frc).getBounds();
      Point2D pt = at.transform(ptSrc, null);
      double dx = pt.getX() - r.getCenterX();
      double dy = pt.getY() - r.getCenterY();
      g2.drawString(txt, (float) dx, (float) dy);
      at.rotate(Math.PI / 6d);
    }
  }
}

protected Shape moveTo12o(Shape s, double radius, double tick) {
  Rectangle2D r = s.getBounds2D();
  double ty = radius - tick * 2d - r.getHeight();
  AffineTransform at = AffineTransform.getTranslateInstance(-r.getCenterX(), -ty);
  return at.createTransformedShape(s);
}

private static Shape getOutline(String txt, Font font, FontRenderContext frc) {
  return new TextLayout(txt, font, frc).getOutline(null);
}