sclass JPaintTool is Swingable {
  transient gettable BufferedImage image;
  transient ImageSurface imageSurface = jImageSurface();
  transient settable Dimension defaultImageSize = sixteenToNine_p(480);
  
  void init {
    if (image == null)
      setImage(newImage(defaultImageSize));
  }
  
  visualize {
    init();
    ret jscroll_center_borderless(imageSurface);
  }
  
  void setImage(BufferedImage image) {
    this.image = image;
    imageSurface.setImage(image);
  }
}