sclass Screenshot extends Concept {
  S pngPath; // optional, relative (program ID + "/" + file name)
  Rect r; // optional, rectangle that was shot
  
  *() {} // for persistance
  *(BufferedImage img) {
    savePNG(pngFile(), img);
  }

  File pngFile() {
    if (pngPath != null)
      ret prepareFile(new File(javaxDataDir(), pngPath));
    ret prepareProgramFile(_programID(), "screenshot" + id + ".png");
  }
  
  BufferedImage loadImage() {
    ret loadImage2(pngFile());
  }
  
  bool hasImage() {
    ret pngFile().exists();
  }
}