I wrote about analytic easing functions a number of years ago and show how to precisely design a spring function: https://medium.com/hackernoon/the-spring-fact

I wrote about analytic easing functions a number of years ago and show how to precisely design a spring function: https://medium.com/hackernoon/the-spring-factory-4c3d988e7129 https://medium.com/hackernoon/the-spring-factory-4c3d988e712... And a bounce function: https://medium.com/hackernoon/the-bounce-factory-3498de1e5262 https://medium.com/hackernoon/the-bounce-factory-3498de1e526...