sclass JG22DataWrangler is Swingable {
  new TargetAndActual<Double> maxKB; // kilobytes per compressed image (pessimistic estimate)
  new TargetAndActual<Double> coveredPixelsPercentage;
  new TargetAndActual<Double> detailLevel;
  
  cachedVisualize {
    var form = new JForm;
    form.addRow("Image source", jlabel("Left screen half"));
    form.addRow("Compressed image size", new JTargetAndActualSlider(maxKB));
    ret form.visualize();
  }
}