svoid drawPixels(BufferedImage img, Iterable<Pt> points, Color color) {
  if (img == null) ret;
  var g = createGraphics(img);
  drawPixels(g, points, color);
}

svoid drawPixels(Graphics2D g, Iterable<Pt> points, Color color) {
  fOr (p : points)
    drawPixel(g, p, color);
}