Separatorを波線で表示

class WavyLineSeparator extends JSeparator {
  private static final int ICONWIDTH = 3;
  private static final Icon WAVY_HLINE = new WavyLineIcon();
  private static final Icon WAVY_VLINE = new WavyLineIcon(VERTICAL);
  public WavyLineSeparator() {
    this(HORIZONTAL);
  }

  public WavyLineSeparator(int orientation) {
    super(orientation);
    if (orientation == HORIZONTAL) {
      setBorder(BorderFactory.createEmptyBorder(2, 1, 2, 1));
    } else {
      setBorder(BorderFactory.createEmptyBorder(1, 2, 1, 2));
    }
  }

  @Override protected void paintComponent(Graphics g) {
    // super.paintComponent(g);
    // g.setClip(0, 0, getWidth(), getHeight());
    int pos;
    Insets i = getInsets();
    if (getOrientation() == HORIZONTAL) {
      for (pos = i.left; getWidth() - pos > 0; pos += WAVY_HLINE.getIconWidth()) {
        WAVY_HLINE.paintIcon(this, g, pos, i.top);
      }
    } else {
      for (pos = i.top; getHeight() - pos > 0; pos += WAVY_VLINE.getIconHeight()) {
        WAVY_VLINE.paintIcon(this, g, i.left, pos);
      }
    }
  }

  @Override public Dimension getPreferredSize() {
    Insets i = getInsets();
    if (getOrientation() == HORIZONTAL) {
      return new Dimension(30, ICONWIDTH + i.top + i.bottom);
    } else {
      return new Dimension(ICONWIDTH + i.left + i.right, 30);
    }
  }

  static class WavyLineIcon implements Icon {
    private final Color sfc = UIManager.getColor("Separator.foreground");
    private final int orientation;
    public WavyLineIcon() {
      this.orientation = HORIZONTAL;
    }

    public WavyLineIcon(int orientation) {
      this.orientation = orientation;
    }

    @Override public void paintIcon(Component c, Graphics g, int x, int y) {
      Graphics2D g2 = (Graphics2D) g.create();
      AffineTransform oldTransform = g2.getTransform();
      g2.setPaint(sfc);
      if (orientation == VERTICAL) {
        g2.translate(x + getIconWidth(), y);
        g2.rotate(Math.PI / 2);
      } else {
        g2.translate(x, y);
      }
      g2.drawLine(0, 2, 0, 2);
      g2.drawLine(1, 1, 1, 1);
      g2.drawLine(2, 0, 3, 0);
      g2.drawLine(4, 1, 4, 1);
      g2.drawLine(5, 2, 5, 2);
      g2.setTransform(oldTransform);
      g2.dispose();
    }

    @Override public int getIconWidth() {
      return (orientation == HORIZONTAL) ? ICONWIDTH * 2 : ICONWIDTH;
    }

    @Override public int getIconHeight() {
      return (orientation == HORIZONTAL) ? ICONWIDTH : ICONWIDTH * 2;
    }
  }
}