please include function renderText.

static BufferedImage renderText_multiLine(S fontName, float fontSize, S text) {

  ret renderText_multiLine(loadFont_cached(fontName), fontSize, text);

}

static BufferedImage renderText_multiLine(Font font, float fontSize, S text) {

  Color background = optPar(renderText_bg, Color.white);

  Color foreground = optPar(renderText_fg, Color.black);

  font = font.deriveFont(fontSize);

  L<S> lines = toLines(text);

  // for font metrics

  BufferedImage dummyImg = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);

  Graphics g = antiAliasGraphics(dummyImg);

  g.setFont(font);

  FontMetrics fm = g.getFontMetrics();

  int width = 0;

  for (S line : lines)

    width = max(width, fm.stringWidth(line));

  if (width <= 0) null;

  int lineHeight = fm.getHeight(); 

  int height = lineHeight*l(lines);

  int y = fm.getAscent();

  BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

  g = antiAliasGraphics(img);

  g.setColor(background);

  g.fillRect(0, 0, width, height);

  g.setColor(foreground);

  g.setFont(font);

  for i over lines:

    g.drawString(lines.get(i), 0, lineHeight*i+y);

  g.dispose();

  return img;

}