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sclass G22_TestScreenPanel is IHasChangeListeners {
  settableWithChange S script;
  settableWithChange bool animate;
  event change;
  
  transient Animation animation;
  transient new G22Utils g22utils;
  transient ImageSurface isInput;
  transient JGazelleVScriptRunner scriptRunner;
  
  void start {
    scriptRunner = new JGazelleVScriptRunner(
      liveValue_hasChangeListeners(this, S, -> script, x -> script = x));
      
    isInput = g22utils.stdImageSurface();
    
    // when test screen is visible, do the animation
    awtEvery(isInput, 1000/20, r stepAnimation);
  }
  
  void stepAnimation {
    if (!animate) ret;
    if (animation == null) {
      animation = new AnimatedLine;
      animation.start();
    }
    animation.nextFrame();
    var img = whiteImage(animation.w, animation.h);
    animation.setGraphics(createGraphics(img));
    animation.paint();
    isInput?.setImage(img);
    
    var ii = bwIntegralImage_withMeta(img);
    scriptRunner.parseAndRunOn(ii);
  }
  
  visual centerAndSouthWithMargin(
    hsplit(
      northAndCenterWithMargin(centerAndEastWithMargin(
        jlabel("Input"), liveValueCheckBox("Animate",
          liveValue_hasChangeListeners(this, bool.class, -> animate, x -> animate(x))),
      jscroll_centered_borderless(isInput)),
      
      northAndCenterWithMargin(centerAndEastWithMargin(
        jlabel("Output"), scriptRunner.lblScore),
      scriptRunner.scpScriptResult)
    ),
      
    scriptRunner.scriptInputField()
  );
}