svoid setPixel(BufferedImage img, Pt etc p, Color color) {
  img?.setRGB(p.x, p.y, colorToIntOpaque(color));
}

svoid setPixel(Graphics2D g, Pt etc p, Color color) {
  g.setColor(color);
  g.drawRect(p.x, p.y, 1, 1);
}