!7

module HorizontalAutoSplit > DynImageSurface {
  float threshold = 0.99f;
  transient ReliableSingleThread rst = dm_rst(this, r segmentIt);
  
  visualize {
    JSlider slider = jLiveValueSlider(dm_fieldLiveValue('threshold));
    main.onChange(slider, rst);
    ret withCenteredLineBelow(super.visualize(),
      withLabel("Threshold:", slider));
  }
  
  start {
    ownResource(vmBus_onMessage('newClipboardContents, voidfunc(fO o) {
      if (o cast BufferedImage) {
        temp enter();
        thread {
          setImage(o);
          rst.trigger();
        }
      }
    }));
  }
  
  void segmentIt {
    temp enter();
    if (!hasImage()) ret;
    overlaySelectionsOnImageSurface(imageSurface,
      horizontalAutoSplitThenAutoCrop(BWImage(getImage()), threshold));
  }
}

Began life as a copy of #1018876