Fontのアウトラインを取得して文字列の内部を修飾する

class TricoloreLabel extends JComponent {
  private final GlyphVector gv;

  public TricoloreLabel(String str) {
    super();
    Font font = new Font(Font.SERIF, Font.PLAIN, 64);
    FontRenderContext frc = new FontRenderContext(null, true, true);
    gv = font.createGlyphVector(frc, str);
  }

  @Override protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    int w = getWidth();
    int h = getHeight();
    g.setColor(Color.WHITE);
    g.fillRect(0, 0, w, h);

    Graphics2D g2 = (Graphics2D) g.create();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    Rectangle2D b = gv.getVisualBounds();
    Point2D p = new Point2D.Double(
        b.getX() + b.getWidth() / 2d, b.getY() + b.getHeight() / 2d);
    AffineTransform toCenterAT = AffineTransform.getTranslateInstance(
        w / 2d - p.getX(), h / 2d - p.getY());

    double d = b.getHeight() / 3;
    Rectangle2D clip  = new Rectangle2D.Double(
        b.getX(), b.getY(), b.getWidth(), b.getHeight());
    Rectangle2D clip1 = new Rectangle2D.Double(
        b.getX(), b.getY(), b.getWidth(), d);
    Rectangle2D clip2 = new Rectangle2D.Double(
        b.getX(), b.getY() + 2 * d, b.getWidth(), d);

    Shape s = toCenterAT.createTransformedShape(gv.getOutline());

    g2.setClip(toCenterAT.createTransformedShape(clip1));
    g2.setPaint(Color.BLUE);
    g2.fill(s);

    g2.setClip(toCenterAT.createTransformedShape(clip2));
    g2.setPaint(Color.RED);
    g2.fill(s);

    g2.setClip(toCenterAT.createTransformedShape(clip));
    g2.setPaint(Color.BLACK);
    g2.draw(s);
    g2.dispose();
  }
}