Snake Multiplayer

Make sure you have a working single player snake (if not two player snake) before starting this project!

Overall, people report that the code for multiplayer snake gets large. You probably want to make a separate folder for your snake game and break it into separate files using require and provide. I recommend each file only do one “part” of the animation. To give you an idea, I made separate files for:

• define-struct
• examples used in testing
• draw handler
• key handler
• tick handler
• collision detection (which is part of the tick handler, but it was complicated enough that I made another file)
• computer player (again, called in tick handler)

Model

For many multi-player snake, we will want:

• a list of apple locations
• a list of snakes,

where each snake has

• id - a number to identify the snake to make it easier to control
• head - position of the head (could just be first of the body)
• body - a list of positions
• dir - a posn giving the direction of motion of the head

(define-struct sn (id head body dir))
(define-struct multi (apples snakes))

Draw Handler

Break the job into pieces, draw each piece on a provided background.

• draw-snake-1: sn image -> image
• draw-snakes: list-of-snakes image -> image
• draw-apple-1: posn image -> image
• draw-apples: list-of-posn image -> image

Key Handler

I wrote one function to determine which id number snake certain keys control and another function to determine which way the snake turns given the keys.

I then applied the change in direction to the snake with the appropriate id (going through the whole list of snakes and not changing the rest of them).

Tick Handler

There’s a lot to the tick handler. I’m going to leave planning this up to you. Email with questions! This sketch is short / incomplete.