Swing/TextLayout のバックアップ(No.6)

String text = "abcdefthijklmnopqrstuvwxyz";
Font font = new Font(Font.SERIF, Font.ITALIC, 64);
FontRenderContext frc = new FontRenderContext(null, true, true);
TextLayout tl = new TextLayout(text, font, frc);
@Override protected void paintComponent(Graphics g) {
  Graphics2D g2 = (Graphics2D) g;
  int w = getWidth();
  float baseline = getHeight() / 2f;

  g2.setPaint(Color.RED);
  g2.draw(new Line2D.Float(0, baseline, w, baseline));

  g2.setPaint(Color.GREEN);
  float ascent = baseline - tl.getAscent();
  g2.draw(new Line2D.Float(0, ascent, w, ascent));

  g2.setPaint(Color.BLUE);
  float descent = baseline + tl.getDescent();
  g2.draw(new Line2D.Float(0, descent, w, descent));

  g2.setPaint(Color.ORANGE);
  float leading = baseline + tl.getDescent() + tl.getLeading();
  g2.draw(new Line2D.Float(0, leading, w, leading));

  g2.setPaint(Color.CYAN);
  float xheight = baseline - (float) tl.getBlackBoxBounds(23, 24).getBounds().getHeight();
  g2.draw(new Line2D.Float(0, xheight, w, xheight));

  g2.setPaint(Color.BLACK);
  tl.draw(g2, 0f, baseline);
}