static int drawThoughtCircleText_margin = 10;

static void drawThoughtCircleText(BufferedImage bg, BufferedImage img, P p, S text) {
  Graphics2D g = imageGraphics(bg);
  g.setColor(Color.white);
  g.setFont(sansSerif(20));
  FontMetrics fm = g.getFontMetrics();
  g.drawString(text, p.x-fm.stringWidth(text)/2.0f, p.y+drawThoughtCircleText_margin+fm.getLeading()+fm.getMaxAscent());
  g.dispose();
}