static BufferedImage renderRenderables(int w, int h, Iterable<Renderable> renderables) {
  ret renderRenderables(newBufferedImage(w, h), renderables);
}

// modifies original image
static BufferedImage renderRenderables(BufferedImage img, Iterable<Renderable> renderables) {
  fOr (Renderable r : renderables)
    r.renderOn(imageGraphics(img), img.getWidth(), img.getHeight());
  ret img;
}

svoid renderRenderables(Graphics2D g, int w, int h, Iterable<Renderable> renderables) {
  fOr (Renderable r : renderables)
    r.renderOn(g, w, h);
}