How to use

removeOverlay

method

in

net.imagej.display.OverlayService

@Override
public void removeThreshold(final ImageDisplay display) {
  final ThresholdOverlay overlay = thresholdMap().get(display);
  if (overlay != null) {
    overlayService.removeOverlay(display, overlay);
    thresholdMap().remove(display);
  }
}

/**
 * Updates the given {@link ImageDisplay} to contain {@link Overlay}s
 * corresponding to all the given {@link ImagePlus}'s Rois (both the active
 * Roi and the Rois stored in ImageJ 1.x's current Overlay).
 */
@Override
public void updateDisplay(final ImageDisplay display, final ImagePlus imp) {
  final List<Overlay> overlaysToRemove = overlayService.getOverlays(display);
  for (final Overlay overlay : overlaysToRemove) {
    overlayService.removeOverlay(display, overlay);
  }
  /*
  if (fullySelected(display, imp)) {
    for (DataView view : display)
      view.setSelected(true);
  }
  else {
  */
  final List<Overlay> overlays = getOverlays(imp);
  overlayService.addOverlays(display, overlays);
  // }
  setModernThreshold(display, imp);
}

private void delete() {
  if (overlayService.getOverlayInfo().getOverlayInfoCount() == 0) return;
  List<Overlay> overlaysToDelete = new LinkedList<>();
  final int[] selectedIndices = overlayService.getOverlayInfo().selectedIndices();
  if (selectedIndices.length == 0) {
    final int result =
      JOptionPane.showConfirmDialog(
        this, "Delete all overlays?", "Delete All", JOptionPane.YES_NO_OPTION);
    if (result != JOptionPane.YES_OPTION) return;
    for (int i = 0; i < overlayService.getOverlayInfo().getOverlayInfoCount(); i++) {
      overlaysToDelete.add(overlayService.getOverlayInfo().getOverlayInfo(i).getOverlay());
    }
  }
  else {
    for (int i = 0; i < selectedIndices.length; i++) {
      int index = selectedIndices[i];
      overlaysToDelete.add(overlayService.getOverlayInfo().getOverlayInfo(index).getOverlay());
    }
  }
  for (Overlay overlay : overlaysToDelete) {
    // NB - removeOverlay() can indirectly change our infoList contents.
    // Thus we first collect overlays from the infoList and then delete
    // them all afterwards to avoid interactions.
    overlayService.removeOverlay(overlay);
  }
}