HackerBox-0036 Verlet Physics Toy

Created alittle physics toy out of HackerBox 0036.

It's using a very basic Verlet Integration and only includes functionality for bouncing particles off walls and eachother at the moment. I would like to add more functionality from my full Verlet Project eventually. This will serve as a good way to experiment with pumping more speed out of a simple c version of the code.

Ofcourse, this assumes you're using the same hardware setup in basically the same way with one imortant difference! The "Lat" pin definition for the display has been changed from 22 to 4. I wanted to eventually add some I2C functionality ( a gyroscope among other things ) so I needed this pin open.

Again, LAT Pin 22 is now Pin 4 on the ESP32!!!

Once uploaded the joystick works as follows:

• "K1" clears all particles from the scene.
• "K2" adds one particle at a time.
• "K3" regenerates the 'scene' with between 200 and 400 particles, this also randomizes the friction of the 'ground' as well.
• "K4" removes on particle at a time.
• "Joystick" tilts "the surface" which imparts gravity on the balls and makes them move.

Things that could be improved:

1. The ball on ball collision response is too strong at close distances for some reason
2. Look into replacing the square rooting with approximations
3. Push the physics code onto a seperate thread
4. Bust the code up into seperate files (main, display, input, etc.)
5. Convert the Verlet code into a library, pull the display code out of it
6. Add constraints with pinning
7. Add constraint & paricle collision
8. Add constraint & constraint collision