srecord noeq G22ChallengePanel(G22Challenge challenge) is Swingable {
  transient int randomSeed = randomInt();
  transient JPanel imagesPanel = jline();
  transient L<BufferedImage> images = syncL();
  transient GazelleV_LeftArrowScript.Script parsedScript;
  
  transient settable new G22Utils g22utils;
  settable double timeoutPerImage = 10.0;
  settable int imagesToPaint = 3;
  settable int interval = 1000;
  
  visualize {
    awtCalcEvery(imagesPanel, interval, r _paintAnImage);
    
    ret withCenteredBoldTitle(str(challenge),
      withTopMargin(jvsplit(
        northAndCenterWithMargin(
          jRightAlignedLine(withLabel("Random seed:", jlabel(intToHex_upper(randomSeed)))),
          jCenteredRaisedSection("Images", jscrollHorizontal(imagesPanel))
        ),
        jCenteredSection("Analysis",
          jTodo()
        )
      )));
  }
  
  void _paintAnImage {
    if (l(images) >= imagesToPaint) ret;
    
    try {
      if (parsedScript == null) {
        var parser = g22utils.leftArrowParser();
        parsedScript = parser.parse(challenge.code);
      }
      
      new VarContext ctx;
      var result = evalWithTimeout(timeoutPerImage, -> parsedScript.get(ctx));
      if (result.isA()) {
        var returnedObject = result.a();
        if (returnedObject instanceof MakesBufferedImage
          || returnedObject instanceof Image)
          returnedObject = toBufferedImage(returnedObject);
        if (returnedObject cast BufferedImage) {
          images.add(returnedObject);
          addToContainer(imagesPanel, g22utils.stdImageSurface(returnedObject));
        } else {
          images.add(null);
          addToContainer(imagesPanel, jcenteredlabel("Script did not return an image but instead " + aOrAn(className(returnedObject))));
        }
      } else {
        images.add(null);
        addToContainer(imagesPanel, jcenteredlabel("Script timed out after " + nSeconds(iceil(timeoutPerImage))));
      }
    } catch print e {
      images.add(null);
      addToContainer(imagesPanel, jError(e));
    }
  }
}