I made an implementation of this, check out my comment for links:

Normal version: https://github.com/DDihanov/AndroidCustomViews/blob/master/app/src/main/java/bg/dihanov/customviewexamples/views/graph/Graph.kt

Animated: https://github.com/DDihanov/AndroidCustomViews/blob/master/app/src/main/java/bg/dihanov/customviewexamples/views/graph/AnimatedGraph.kt

EDIT: As promised I made an implementation of this, of course I changed up some logic, but it’s very close to the original, I also went ahead and made an animated version of it. There might be some bugs as I haven’t fully tested it:

Here is a preview:

example