!7

sclass SystemCPUTrayIcon extends DynBigNumber {
  transient BufferedImage trayImage;
  transient TrayIcon trayIcon; 
  int size = 20;
  
  start {
    setDescription("SYSTEM CPU %");
    setToolTip("Percentage is per core (max=" + numberOfCores()*100 + "%)");
    ownTimer(doEvery(2.0, r actualUpdate));
    ownResource(tempTrayIcon(trayIcon = installTrayIcon(trayImage = whiteImage(size, size), "System CPU")));
  }
  
  void actualUpdate {
    double load = systemCPULoad();
    setValue(toIntPercent_ceil(load*numberOfCores()) + " %");
    int w = trayImage.getWidth(), h = trayImage.getHeight();
    copyImagePart(trayImage, 1, 0, trayImage, 0, 0, w-1, h);
    int y = iround((h-1)*load);
    fillRect(trayImage, w-1, 0, 1, y, Color.white);
    fillRect(trayImage, w-1, y, 1, h-y, Color.orange);
    trayIcon.setImage(trayImage);
  }
}