static void cycleSegmentedComponents(final BufferedImage img, final L<ConnectedComponent> components) {
  final new Var<ImageSurface> is;
  final Var<int> iComponent = new(0);
  
  Runnable nextImage = r {
    is.set(packFrameInTopRightCorner(showZoomedImage(is!,
      cutOutPixelSet(img, components.get(iComponent!)), "Cut out " + (iComponent!+1) + "/" + l(components)));
    iComponent.set(mod(iComponent!+1, l(components));
  };
  
  callF(nextImage);
  packInTopRightCorner(addToWindow(is!, jcenteredbutton("Next", nextImage)));
}