import java.awt.geom.*;

static void paintSkyBackground(Component c, Graphics _g, BufferedImage image) {
  Graphics2D g = cast _g;
  RenderingHints hints = g.getRenderingHints();
  antiAliasOn(g);
  int w = c.getWidth(), h = c.getHeight();
  int iw = image.getWidth(), ih = image.getHeight();
  g.setColor(c.getBackground());
  g.fillRect(0, 0, w, h);
  double imgScale = doubleRatio(w, iw);
  AffineTransform before = g.getTransform();
  double y1 = h-ih*imgScale;
  g.translate(0, y1);
  g.scale(imgScale, imgScale);
  g.drawImage(image, 0, 0, c);
  g.setTransform(before);
  g.setRenderingHints(hints);
}