$1 Unistroke Recognizer, useful for recognizing gestures in the facility nib terminal, is on the market under the New BSD License. I’ve created some slight modifications, which permit gestures to become more easily recognized that can be found on github. Most fineliner pens come about to generally be watertight, https://josuezqguh.blogofchange.com/37290292/an-unbiased-view-of-ink-drawing-for-beginners