Greenfoot can run on your local machine or on the website which lets it run on phone, tablet, etc. It doesn't directly support touch events on any of these platforms, but usually touch events will be translated into mouse events -- although they may be translated slightly differently by different devices. Tapping is almost certainly rendered into a click. I don't for sure about swiping, but I suspect it will show up as a mouse-drag, although you may then have to perform the calculations to decide which direction the swipe is in, how long it lasts, etc.

Your suspicion was correct. Mouse dragging can be translated into swiping using direction and speed of dragging.

I have published a sample demo with source for anyone interested -- Tap and Swipe Demo. Will document and re-upload shortly.

My plan is to run my program at a Raspberry Pi 4 with a 7" or 10 " touch screen, so it will in effect by quite similar to a pad. Will dive into your demo now!