How to use

getFirstDisplay

method

in

net.imagej.display.OverlayService

private void draw() {
  ChannelCollection channels = getChannels();
  List<Overlay> selected = overlayService.getOverlayInfo().selectedOverlays();
  for (Overlay o : selected) {
    ImageDisplay disp = overlayService.getFirstDisplay(o);
    overlayService.drawOverlay(o, disp, channels);
  }
}

private void fill() {
  ChannelCollection channels = getChannels();
  List<Overlay> selected = overlayService.getOverlayInfo().selectedOverlays();
  for (Overlay o : selected) {
    ImageDisplay disp = overlayService.getFirstDisplay(o);
    overlayService.fillOverlay(o, disp, channels);
  }
}