Khan Academy has a good Natural Simulations in JS tract. https://www.khanacademy.org/computing/computer-programming/programming-natural-simulations https://www.

Khan Academy has a good Natural Simulations in JS tract. https://www.khanacademy.org/computing/computer-programming/programming-natural-simulations https://www.khanacademy.org/computing/computer-programming/p... It uses processing.js when I worked through it I just ended up implementing everything with canvas and making my own versions of the processing specific classes and functions needed.